Femtosecond Laser Micromachining Of Microstructures For Sensing And Detection

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Femtosecond Laser Micromachining of Microstructures for Sensing and Detection

Author : Yukun Han
Publisher :
ISBN 13 :
Total Pages : 118 pages
Book Rating : 4.:/5 (775 download)

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Book Synopsis Femtosecond Laser Micromachining of Microstructures for Sensing and Detection by : Yukun Han

Download or read book Femtosecond Laser Micromachining of Microstructures for Sensing and Detection written by Yukun Han and published by . This book was released on 2011 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis focuses on the fabrication and analysis of miniature functional devices that can be used for different sensing and detection applications. As the first step, the surface characteristics and morphology of the micro/nano structures on substrates (fused silica and silicon) fabricated in water and in air by femtosecond laser were investigated. Based on this study, three micro devices have been designed and fabricated by femtosecond laser, and they were analyzed for optical and chemical sensing and detections. The three micro devices are: 1) an optical Fabry-Perot interferometer in optical fiber (made from fused silica) with smooth cavity surfaces. The Fabry-Perot interferometer was used to measure accurately the refractive index of solution and, hence, is capable of identifying different solutions; 2) a fused silica glass substrate for surface enhanced Raman spectroscopy (SERS). The optimized morphology (in nano/micron scales) on the fused silica surface with post chemical silver planting which can achieve a cross-section enhancement factor (EF) of 2.5 x 106, evaluated by 10−7 M Rhodamine 6G solutions; 3) a nanostructured silicon substrate for the surface-enhanced Raman scattering application. A simple and efficient method was developed to fabricate a substrate that was pre-coated with silver nitrite film to generate silver nanoparticles over a large-area. This study demonstrates that an EF greater than 5 x105, measured by 10−6 M Rhodamine 6G solutions can be achieved. The proposed fabrication techniques and miniature devices can be used to integrate the SERS capability into a microchip (lab-on-a-chip) for biomedical and chemical analysis"--Abstract, leaf iv.

Femtosecond Laser Micromachining

Author : Roberto Osellame
Publisher : Springer Science & Business Media
ISBN 13 : 364223366X
Total Pages : 485 pages
Book Rating : 4.6/5 (422 download)

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Book Synopsis Femtosecond Laser Micromachining by : Roberto Osellame

Download or read book Femtosecond Laser Micromachining written by Roberto Osellame and published by Springer Science & Business Media. This book was released on 2012-03-05 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: Femtosecond laser micromachining of transparent material is a powerful and versatile technology. In fact, it can be applied to several materials. It is a maskless technology that allows rapid device prototyping, has intrinsic three-dimensional capabilities and can produce both photonic and microfluidic devices. For these reasons it is ideally suited for the fabrication of complex microsystems with unprecedented functionalities. The book is mainly focused on micromachining of transparent materials which, due to the nonlinear absorption mechanism of ultrashort pulses, allows unique three-dimensional capabilities and can be exploited for the fabrication of complex microsystems with unprecedented functionalities.This book presents an overview of the state of the art of this rapidly emerging topic with contributions from leading experts in the field, ranging from principles of nonlinear material modification to fabrication techniques and applications to photonics and optofluidics.

Femtosecond Laser Micro-machined Optical Fiber Based Embeddable Strain and Temperature Sensors for Structural Monitoring

Author : Amardeep Kaur
Publisher :
ISBN 13 :
Total Pages : 80 pages
Book Rating : 4.:/5 (92 download)

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Book Synopsis Femtosecond Laser Micro-machined Optical Fiber Based Embeddable Strain and Temperature Sensors for Structural Monitoring by : Amardeep Kaur

Download or read book Femtosecond Laser Micro-machined Optical Fiber Based Embeddable Strain and Temperature Sensors for Structural Monitoring written by Amardeep Kaur and published by . This book was released on 2014 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Structural monitoring technology is becoming increasingly important for managing all types of structures. Embedding sensors while constructing new structures or repairing the old ones allows for continual monitoring of structural health thus giving an estimate of remaining utility. Along with being embeddable, miniaturized sensors that are easy to handle are highly sought after in the industry where in-situ monitoring is required in a harsh environment (corrosive atmosphere, high temperatures, high pressure etc.). This dissertation demonstrates the use of femtosecond laser-fabricated Fabry-Perot interferometer (FPI) based optical fiber sensors for embedded applications like structural health monitoring. Two types of Fabry-Perot interferometer sensors, extrinsic FPI and intrinsic FPI, have been designed, developed and demonstrated for strain and temperature monitoring applications. The absence of any movable parts make these sensors easy-to-handle and easy to embed inside a material. These sensors were fabricated using a laboratory integrated femtosecond (fs) laser micromachining system. For the extrinsic Fabry-Perot interferometer (EFPI) design, the fs-laser was used to ablate and remove the material off the fiber end face while for intrinsic Fabry-Perot interferometer (IFPI) design, the laser power was focused inside the fiber on the fiber core to create two microstructures. The scope of the work presented in this dissertation extends to device design, laser based sensor fabrication, sensor performance evaluation and demonstration. Feasibility of using these sensors for embeddable applications was investigated. A new type of material called Bismaleimide (BMI) was used for demonstrating the embeddability of the sensors. Experimental results of strain and temperature testing are presented and discussed. The EFPI sensor has low temperature sensitivity of 0.59 pm/oC and a high strain sensitivity of 1.5 pm/[mu][sigma]. The IFPI sensor has the same strain sensitivity as EFPI but is 25 times more sensitive to the temperature. These sensors were tested up to 850 oC in non-embedded condition and they produced a linear response. A hybrid approach combining the EFPI and IFPI sensors was demonstrated for simultaneous measurement of strain and temperature"--Abstract, page iii.

Femtosecond Laser 3D Micromachining for Microfluidic and Optofluidic Applications

Author : Koji Sugioka
Publisher : Springer Science & Business Media
ISBN 13 : 1447155416
Total Pages : 131 pages
Book Rating : 4.4/5 (471 download)

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Book Synopsis Femtosecond Laser 3D Micromachining for Microfluidic and Optofluidic Applications by : Koji Sugioka

Download or read book Femtosecond Laser 3D Micromachining for Microfluidic and Optofluidic Applications written by Koji Sugioka and published by Springer Science & Business Media. This book was released on 2013-09-24 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: Femtosecond lasers opened up new avenue in materials processing due to its unique features of ultrashort pulse width and extremely high peak intensity. One of the most important features of femtosecond laser processing is that strong absorption can be induced even by materials which are transparent to the femtosecond laser beam due to nonlinear multiphoton absorption. The multiphoton absorption allows us to perform not only surface but also three-dimensionally internal microfabrication of transparent materials such as glass. This capability makes it possible to directly fabricate three-dimensional microfluidics, micromechanics, microelectronics and microoptics embedded in the glass. Further, these microcomponents can be easily integrated in a single glass microchip by the simple procedure using the femtosecond laser. Thus, the femtosecond laser processing provides some advantages over conventional methods such as traditional semiconductor processing or soft lithography for fabrication of microfluidic, optofludic and lab-on-a-chip devices and thereby many researches on this topic are currently being carried out. This book presents a comprehensive review on the state of the art and future prospects of femtosecond laser processing for fabrication of microfluidics and optofludics including principle of femtosecond laser processing, detailed fabrication procedures of each microcomponent and practical applications to biochemical analysis.

Development of Single Element Detection Imaging Systems and Femtosecond Laser Micromachining for Additive Manufacturing Processes

Download Development of Single Element Detection Imaging Systems and Femtosecond Laser Micromachining for Additive Manufacturing Processes PDF Online Free

Author : Nathan G. Worts
Publisher :
ISBN 13 :
Total Pages : 113 pages
Book Rating : 4.:/5 (18 download)

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Book Synopsis Development of Single Element Detection Imaging Systems and Femtosecond Laser Micromachining for Additive Manufacturing Processes by : Nathan G. Worts

Download or read book Development of Single Element Detection Imaging Systems and Femtosecond Laser Micromachining for Additive Manufacturing Processes written by Nathan G. Worts and published by . This book was released on 2018 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Optical Fiber Devices Fabricated by Femtosecond Laser Micro-machining for Sensing Applications

Author : Minwei Yang
Publisher :
ISBN 13 :
Total Pages : 128 pages
Book Rating : 4.:/5 (793 download)

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Book Synopsis Optical Fiber Devices Fabricated by Femtosecond Laser Micro-machining for Sensing Applications by : Minwei Yang

Download or read book Optical Fiber Devices Fabricated by Femtosecond Laser Micro-machining for Sensing Applications written by Minwei Yang and published by . This book was released on 2011 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fs laser scanning technique is applied to fabricate micro-cavity into fiber. By asymmetrically positioned the micro-cavity to be deviated from the core center, the remaining core and the micro-cavity can form a Mach-Zehnder interferometer (MZI) with a large RI difference between the two arms and enables a compact device dimension. The fringe visibility can be optimized by adjusting the deviation position. The micro-cavity can be applied for both high temperature (up to 1100) sensing with a good repeatability and RI sensing with an extremely large sensitivity around the RI value of water. Novel structural modulated long period fiber grating (LPFG) can be fabricated by periodically positioning micro-holes either symmetrically in all solid photonic bandgap fiber or asymmetrically in single mode fiber. The micro-holes can effectively couple energy from core mode to cladding mode and thus enabling a compact grating dimension. Cladding modes involved in coupling are numerically simulated and compared with the experiments. The RI sensing properties are measured for both types of LPFG. Integration of micro-holes into the fiber with inscribed fiber Bragg grating (FBG) is achieved by locating micro-holes asymmetrically on one side of the core. The micro-holes can partially expose the core to external RI without significantly damaging the FBG structure. This composite sensor can detect both temperature and RI simultaneously, by tracing the wavelength change and transmission loss of the FBG resonant dip. Selective infiltration of liquid into air hole(s) of photonic crystal fiber is developed. This technique has the advantages of flexibility, good accuracy and device robustness. Two kinds of sensor devices, a directional coupler and a MZI are developed based on this technique. Both of the devices possess a large temperature sensitivity.

Capillary Forces on Femtosecond Laser Micromachined Metallic Surfaces

Author : Jorge Lehr
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (922 download)

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Book Synopsis Capillary Forces on Femtosecond Laser Micromachined Metallic Surfaces by : Jorge Lehr

Download or read book Capillary Forces on Femtosecond Laser Micromachined Metallic Surfaces written by Jorge Lehr and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "In this PhD thesis, femtosecond laser micromachining was applied on titanium surfaces to produce homogeneous arrays of surface structures with the objective of studying their wetting behavior and the magnitude of capillary forces measured in a humid environment.The relevant machining parameters to control the formation of uniform arrays of surface structures were identified, and two types of surface microstructures covered with nanoscale roughness were produced in air. The two types of structures were found to result from different formation regimes, since only for one type a uniform energy input on the target surface was required to obtain a homogeneous array.Micromachining in pure oxygen, nitrogen and helium showed that the formation of these microstructures depends also on the environment: The chemical composition and optical properties of the surface and the cloud of ablated nanoparticles was identified to be responsible for the decrease of the effective energy input in a nitrogen environment. It was found that titanium-nitride (TiN) was formed on the surface during machining in nitrogen, while the surface chemistry, and hence the effective energy, were practically unchanged for oxygen and helium environments. Even though, it was possible to produce the two previously found types of microstructures, only oxygen was identified to allow the formation of highly uniform arrays.Wettability and capillary forces were measured with colloidal atomic force microscopy on the previously produced surfaces as well as on surfaces that carry only roughness on the nanoscale. Microstructured surfaces and these containing TiN were found to be hydrophobic, however exhibiting a high magnitude of capillary forces. The forces were limited on samples with only nanoscale roughness, which were machined in oxygen. At the same time these samples were hydrophobic and the least sensitive to an increase of the relative humidity in the environment." --

Machining of Novel Devices with 3D Microstructures in Bulk Materials by Femtosecond Pulsed Laser Ablation

Author : Yinggang Huang
Publisher :
ISBN 13 :
Total Pages : 122 pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis Machining of Novel Devices with 3D Microstructures in Bulk Materials by Femtosecond Pulsed Laser Ablation by : Yinggang Huang

Download or read book Machining of Novel Devices with 3D Microstructures in Bulk Materials by Femtosecond Pulsed Laser Ablation written by Yinggang Huang and published by . This book was released on 2017 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advent of femtosecond (fs) lasers brought remarkable advances in the field of material processing due to the characteristics of ultrashort pulse duration and extremely high peak intensity which are linked to two main features of the emerging fs laser micromachining. The sub-picosecond pulse width is smaller than the energy transfer time from electrons to the lattice resulting in minimal thermal damage which is vital for ultrahigh precision manufacturing, while high peak intensity allows nonlinear phenomenon such as multiphoton absorption and tunneling ionization making it insusceptible to selection of materials for micromachining. Moreover, the inherently maskless and direct-writing capabilities of fs laser micromachining opens opportunities for rapid and complex 3D micro-structure fabrication paving a new way to realize a plethora of novel devices with unprecedented functionalities and performance. In this body of research, three distinct microstructures fabricated by fs laser micromachining technique in disparate applications are demonstrated which are not readily achievable with other manufacturing methods. The presented devices find their merits and great potential in the fields of microfluidics, photovoltaics and imaging science, respectively. Firstly, a through-wafer all-SiC fluidic microstructure is demonstrated. Due to the unusual material property of silicon carbide, the proposed microfluidic structure could be used in the harsh environment with elevated temperature, intense radiation and corrosive surroundings. Furthermore, through-wafer design opens the possibility of SiC wafer bonding that has a foreseeable potential for more novel microelectromechanical devices. Then we present a type of novel lateral dye-sensitized solar cells (DSSC's). The fill factor is more than double and the efficiency is improved tremendously compared with the lateral solar cells previously reported. The fs pulsed laser is used to cut through TiO2 film to create an interdigital pattern thereby forming two electrodes. The compact design of such lateral structure considerably simplifies the solar cell modules that enables hybrid solar energy harvesting/storage devices. Finally, a biologically inspired artificial eye consisting of an array of micro-photo-collectors with high photo-sensitivity is reported. Furthermore, the software approach based on iterative-back-projection (IBP) super-resolution image reconstruction algorithm is adopted to greatly increase resolution of the images obtained from the artificial eye.

Micromachining Techniques for Fabrication of Micro and Nano Structures

Author : Mojtaba Kahrizi
Publisher : BoD – Books on Demand
ISBN 13 : 9533079061
Total Pages : 316 pages
Book Rating : 4.5/5 (33 download)

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Book Synopsis Micromachining Techniques for Fabrication of Micro and Nano Structures by : Mojtaba Kahrizi

Download or read book Micromachining Techniques for Fabrication of Micro and Nano Structures written by Mojtaba Kahrizi and published by BoD – Books on Demand. This book was released on 2012-02-03 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: Micromachining is used to fabricate three-dimensional microstructures and it is the foundation of a technology called Micro-Electro-Mechanical-Systems (MEMS). Bulk micromachining and surface micromachining are two major categories (among others) in this field. This book presents advances in micromachining technology. For this, we have gathered review articles related to various techniques and methods of micro/nano fabrications, like focused ion beams, laser ablation, and several other specialized techniques, from esteemed researchers and scientists around the world. Each chapter gives a complete description of a specific micromachining method, design, associate analytical works, experimental set-up, and the final fabricated devices, followed by many references related to this field of research available in other literature. Due to the multidisciplinary nature of this technology, the collection of articles presented here can be used by scientists and researchers in the disciplines of engineering, materials sciences, physics, and chemistry.

Micromachining

Author : Zdravko Stanimirović
Publisher : BoD – Books on Demand
ISBN 13 : 1789238099
Total Pages : 174 pages
Book Rating : 4.7/5 (892 download)

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Book Synopsis Micromachining by : Zdravko Stanimirović

Download or read book Micromachining written by Zdravko Stanimirović and published by BoD – Books on Demand. This book was released on 2019-11-20 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: To present their work in the field of micromachining, researchers from distant parts of the world have joined their efforts and contributed their ideas according to their interest and engagement. Their articles will give you the opportunity to understand the concepts of micromachining of advanced materials. Surface texturing using pico- and femto-second laser micromachining is presented, as well as the silicon-based micromachining process for flexible electronics. You can learn about the CMOS compatible wet bulk micromachining process for MEMS applications and the physical process and plasma parameters in a radio frequency hybrid plasma system for thin-film production with ion assistance. Last but not least, study on the specific coefficient in the micromachining process and multiscale simulation of influence of surface defects on nanoindentation using quasi-continuum method provides us with an insight in modelling and the simulation of micromachining processes. The editors hope that this book will allow both professionals and readers not involved in the immediate field to understand and enjoy the topic.

Fiber-Optic Fabry-Perot Sensors

Author : Yun-Jiang Rao
Publisher : CRC Press
ISBN 13 : 1498736947
Total Pages : 205 pages
Book Rating : 4.4/5 (987 download)

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Book Synopsis Fiber-Optic Fabry-Perot Sensors by : Yun-Jiang Rao

Download or read book Fiber-Optic Fabry-Perot Sensors written by Yun-Jiang Rao and published by CRC Press. This book was released on 2017-04-27 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors deliver a complete overview of fiber-optic Fabry-Perot (FFP) sensing technology, integrating the knowledge and tools of multiple fields including optics, sensing, micromachining, instrumentation, physics, and materials science. The main chapters discuss operating principles, microstructures, fabrication methods, signal demodulation, and instrumentation. This treatment spans the full range of structures (intrinsic/extrinsic, multimode fiber vs single-mode fibers), as well as advanced micromachining technologies and major interrogating and multiplexing methods for the formation of multi-point, quasi-distributed sensing networks. Readers will also gain a summary of state-of-the-art applications in oil, gas, and electricity industries, aerospace technology, and biomedicine. Yun-Jiang Rao is Dean of the School of Communication & Information Engineering, and Director of the Key Lab of Optical Fiber Sensing & Communications at the University of Electronic Science and Technology of China. Zeng-Ling Ran and Yuan Gong are both associate professors at the Optical Fiber Technology Research Laboratory of the University of Electronic Science and Technology of China.

New Trends and Applications in Femtosecond Laser Micromachining

Author : Francesca Bragheri
Publisher : Mdpi AG
ISBN 13 : 9783036533100
Total Pages : 158 pages
Book Rating : 4.5/5 (331 download)

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Book Synopsis New Trends and Applications in Femtosecond Laser Micromachining by : Francesca Bragheri

Download or read book New Trends and Applications in Femtosecond Laser Micromachining written by Francesca Bragheri and published by Mdpi AG. This book was released on 2022-03-14 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the scientific contributions to the Special Issue entitled: "New Trends and Applications in Femtosecond Laser Micromachining". It covers an array of subjects, from the basics of femtosecond laser micromachining to specific applications in a broad spectra of fields such biology, photonics and medicine.

Femtosecond Laser Micromachining Technology, Materials Processing and Evaluation

Author : George Logan DesAutels
Publisher :
ISBN 13 :
Total Pages : 276 pages
Book Rating : 4.:/5 (255 download)

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Book Synopsis Femtosecond Laser Micromachining Technology, Materials Processing and Evaluation by : George Logan DesAutels

Download or read book Femtosecond Laser Micromachining Technology, Materials Processing and Evaluation written by George Logan DesAutels and published by . This book was released on 2008 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Femtosecond Laser Micromachining of Cutting Tool Materials

Author : Kishan Kulkarni
Publisher :
ISBN 13 :
Total Pages : 182 pages
Book Rating : 4.:/5 (568 download)

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Book Synopsis Femtosecond Laser Micromachining of Cutting Tool Materials by : Kishan Kulkarni

Download or read book Femtosecond Laser Micromachining of Cutting Tool Materials written by Kishan Kulkarni and published by . This book was released on 2004 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Development of Precise Femtosecond Laser Micromachining Processes for Metals and Electrospun Nanofibers

Author : ChangKyoo Park
Publisher :
ISBN 13 :
Total Pages : 147 pages
Book Rating : 4.:/5 (924 download)

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Book Synopsis Development of Precise Femtosecond Laser Micromachining Processes for Metals and Electrospun Nanofibers by : ChangKyoo Park

Download or read book Development of Precise Femtosecond Laser Micromachining Processes for Metals and Electrospun Nanofibers written by ChangKyoo Park and published by . This book was released on 2015 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: Femtosecond pulse lasers have proven to be versatile for micro-scale ablation of a variety of materials with high quality machining due to minimal residual stress, heat affected zone, and melting. In addition, femtosecond laser is one of the non-cleanroom techniques that does not require masking, chemical reagents, and multiple steps. This simple and convenient micromachining technique enables machining of various materials in 3-dimensional geometry. However, some factors such as optical scattering, beam shape, and debris accumulation hinder the high quality of ablation. In this dissertation, femtosecond laser was employed for the micromachining of electrospun nanofibers and metals. Optimization of a process for the high quality femtosecond laser machining was investigated. Femtosecond laser and electrospun poly(e-caprolactone) (PCL) nanofibers mesh interaction was analyzed by optical property measurements and the optical absorption and scattering coefficients were estimated. The specific energy required for ablating a unit volume of pure PCL nanofibers and polydimethylsiloxane-poly(e-caprolactone) (PDMS-PCL) core-shell nanofibers was measured. Material inherent optical properties including the ablation threshold fluence and the incubation coefficient of PDMS and PCL were estimated. Circular grooves were fabricated on aluminum, stainless steel 316, and Stellite 6 and circular disks were successfully machined from a thick section of Stellite. The tapered cross-section was detected from the Stellite disk and the tapering was minimized by varying pulse energy during ablation process. Moreover, a novel debris removal technique based on DC-dielectrophoresis (DEP) force was used to machine the linear and circular grooves on aluminum and the ablation depth and precision were compared with the gas jet debris removal technique.

Femtosecond Laser Micromachining of Low-temperature Co-fired Ceramic and Glass Fiber Reinforced Polymer Printed Circuit Boards Materials

Download Femtosecond Laser Micromachining of Low-temperature Co-fired Ceramic and Glass Fiber Reinforced Polymer Printed Circuit Boards Materials PDF Online Free

Author : Raif Farkouh
Publisher :
ISBN 13 :
Total Pages : 92 pages
Book Rating : 4.:/5 (12 download)

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Book Synopsis Femtosecond Laser Micromachining of Low-temperature Co-fired Ceramic and Glass Fiber Reinforced Polymer Printed Circuit Boards Materials by : Raif Farkouh

Download or read book Femtosecond Laser Micromachining of Low-temperature Co-fired Ceramic and Glass Fiber Reinforced Polymer Printed Circuit Boards Materials written by Raif Farkouh and published by . This book was released on 2017 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low-temperature co-fired ceramic (LTCC), and glass fiber reinforced polymer (GFRP) printed circuit boards (PCBs) are two materials used for the packaging of electronics. The excellent mechanical and electrical properties of LTCC, combined with the ability to embed passive components offer superior radio frequency (RF) performance and device miniaturization for high-frequency applications. Due to its unique properties, LTCC provides superior performance in applications as diverse as military radar, imaging systems, advanced automotive sensing, telecommunications, and satellites. The use of LTCC in these applications has created a demand for the micromachining of holes, channels, and cavities with specific geometries and structures. Likewise, GFRP PCBs are the backbone of the electronics industry. They work to mechanically support and electrically connect components using conductive tracks, pads and other features etched from copper sheets laminated onto GFRP substrate. Since the electronics industry has been moving toward devices with smaller size and lower cost, there has been an increasing need to drill holes in GFRP PCBs with high quality and efficiency. Some of the conventional techniques used to machine LTCC and GFRP PCBs are micro punching, mechanical milling, and electrical discharge machining. These techniques can machine some structures on LTCC and GFRP PCBs, but the drawbacks such as geometry-limitation, wear and tear of tools, high-cost, complex equipment, lack of flexibility and crack-tendency limit the application of these techniques. Femtosecond laser micromachining is a comparatively new technique that offers a solution to meet the challenging demand for drilling of LTCC and GFRP PCBs. The unique properties of ultrashort pulse width and the extremely high peak intensity allow fs laser to drill high-quality holes and to minimize thermal and mechanical damage by the term of "cold" ablation mechanism. In this project, efficient processes for femtosecond laser drilling of LTCC and GFRP PCBs for RF packaging were developed. A high drilling quality with no trace of dross, debris and reacting layer was achieved. The effects of the laser parameters, including pulse energy, scanning speed, focal position, and pitch, on the hole quality, were investigated. A laser polishing process of LTCC was also developed since the reduction of surface roughness is of practical importance for achieving low microwave loss.

Printed Flexible Sensors

Author : Anindya Nag
Publisher : Springer
ISBN 13 : 3030137651
Total Pages : 198 pages
Book Rating : 4.0/5 (31 download)

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Book Synopsis Printed Flexible Sensors by : Anindya Nag

Download or read book Printed Flexible Sensors written by Anindya Nag and published by Springer. This book was released on 2019-03-11 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents recent advances in the design, fabrication and implementation of flexible printed sensors. It explores a range of materials for developing the electrode and substrate parts of the sensors, on the basis of their electrical and mechanical characteristics. The sensors were processed using laser cutting and 3D printing techniques, and the sensors developed were employed in a number of healthcare, environmental and industrial applications, including: monitoring of physiological movements, respiration, salinity and nitrate measurement, and tactile sensing. The type of sensor selected for each application depended on its dimensions, robustness and sensitivity. The sensors fabricated were also embedded in an IoT-based system, allowing them to be integrated into real-time applications.