Author : Parinaz Emami
Publisher :
ISBN 13 :
Total Pages : 63 pages
Book Rating : 4.:/5 (97 download)
Book Synopsis Electron Beam Lithography for Nano-antenna Fabrication by : Parinaz Emami
Download or read book Electron Beam Lithography for Nano-antenna Fabrication written by Parinaz Emami and published by . This book was released on 2015 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lithography methods have been used for patterning of small features for decades; there are different kinds of lithography methods such as Photolithography, Nanosphere Lithography, X-Ray Lithography, Focused Ion Beam (FIB) lithography, and Electron Beam Lithography (EBL). Each of these methods is suitable for a specific purpose of patterning; between all of these methods EBL provides a better result for patterning small features as compared with other methods. In this research project, I examined EBL for fabrication of nano-antennas and then parameterized EBL variables to improve patterning. I overcame difficulties in some steps of this method to make the process easier and faster. In this experiment I analyzed the relationship between the variation of pattern size and tuning the correct irradiation dose for that pattern. According to my observations, a doubling of the physical size of pattern results in a 10 to 15% reduction in the required dose. This result helps save time by eliminating unnecessary and challenging steps. I also examined the effect of varying resist composition in three different sizes of pattern to find which resist would provide the best result: sharper edges and easier fabrication. For instance, MMA(8.5)MAA would be a good choice if the pattern features are larger than 15 microns whereas SU-8 would be great choice for patterning really small features on a nanometer scale. This research also demonstrated that Cr would be a better choice as a metallic coating as compared with Cu. Pt can also be used but by considering its price, I believed it would not be applicable for all purposes. Furthermore for metal deposition methods, sputter coating would be a better method in comparison with PVD, because it gives a less damaged device during lift-off and also Cr’s lift-off time is much less than other metals in this experiment which also saves a lot of time. Finally, I worked on developing EBL multilayer patterning processes. This method is very helpful for fabrication of complicated devices. I developed an aligninment method for multilayer patterning to make sure that my second layer of patterning would be placed in the exact spot that I wanted. Obtaining successful multilayer patterns of small features is helpful for fabricating the small complex facets of rectenna such as fabrication of metal-insulator-metal (MIM) diodes.