Author : Ali Hatef
Publisher :
ISBN 13 :
Total Pages : 230 pages
Book Rating : 4.:/5 (16 download)
Book Synopsis Quantum Coherence and Interference in Metallic Photonic Crystals and Hybrid Systems by : Ali Hatef
Download or read book Quantum Coherence and Interference in Metallic Photonic Crystals and Hybrid Systems written by Ali Hatef and published by . This book was released on 2011 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, we study the absorption coefficient of quantum dots doped in metallic photonic crystals under different circumferences. The quantum dots are considered as an ensemble of three-level energy systems, containing two excited states and a ground state. We study numerically the temporal evolution of the absorption coefficient profile where a probe field is applied to monitor the absorption process in two cases, when quantum dots are embedded lightly and densely. It is found that the absorption profile shows more oscillations and system goes towards the transparent state. We also studied the effect of a changing plasma frequency on the absorption profile of quantum dots two possible field configurations. In the first configuration, a single probe field couples with the ground state and the two excited states. In this case it is found that the position of the transparent peak is moved, due to a slight change in the plasma energy. This means that the transparent state becomes an absorbing state. In the second configuration, a pump field couples with only one excited state, while the probe field couples to the other. In this case, we found that a peak in the absorption profile appears due to plasmon coupling, and this peak splits into two peaks when the plasma energy is decreased. This change in plasma energy can also take the system from the absorption region to the gain region. We developed an analytical theory for the photonic band structure and density of states of two-dimensional rectangular metallic photonic crystals. We found that the location of the photonic band gap can be controlled by modifying the plasma energy of either metal. We showed that by changing the plasma energy one can control the spontaneous emission in the metallic photonic crystal. Finally, I studied hybrid systems (quantum dot - metallic nanoparticle). In such hybrid systems, it is possible to control spontaneous emission in the semiconductor nanocrystals. Significant applications of this include the development of chemical and biological nanosensors, electrical DNA switches, and nanoscale devices as biosensors. The main advantage of hybrid systems when compared with other nano-optical systems is the possibility for direct energy and quantum information transfer between nanoparticles. In this project, we investigate the control of thermal energy loss in metallic nanoparticles, an effect which could destroy the quality of transformed information if not properly controlled.