tailieunhanh - Báo cáo hóa học: " The Study of Quantum Interference in Metallic Photonic Crystals Doped with Four-Level Quantum Dots"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: The Study of Quantum Interference in Metallic Photonic Crystals Doped with Four-Level Quantum Dots | Nanoscale Res Lett 2010 5 464-468 DOI S11671-009-9517-1 SPECIAL ISSUE ARTICLE The Study of Quantum Interference in Metallic Photonic Crystals Doped with Four-Level Quantum Dots Ali Hatef Mahi Singh Received 31 August 2009 Accepted 17 December 2009 Published online 7 January 2010 The Author s 2010. This article is published with open access at Abstract In this work the absorption coefficient of a metallic photonic crystal doped with nanoparticles has been obtained using numerical simulation techniques. The effects of quantum interference and the concentration of doped particles on the absorption coefficient of the system have been investigated. The nanoparticles have been considered as semiconductor quantum dots which behave as a four-level quantum system and are driven by a single coherent laser field. The results show that changing the position of the photonic band gap about the resonant energy of the two lower levels directly affects the decay rate and the system can be switched between transparent and opaque states if the probe laser field is tuned to the resonance frequency. These results provide an application for metallic nanostructures in the fabrication of new optical switches and photonic devices. Keywords Metallic photonic crystal Quantum dot Dipole-dipole interaction Quantum interference Quantum optics Introduction In the past few decades there has been a growing interest in the development of artificial nano-materials. One class of material such as this is photonic crystals PCs which are periodic dielectric or semiconductor structures that display a photonic band gap PBG in their electromagnetic wave transmission characteristics 1-4 . The existence of the PBG has inspired the design of various nano-optical A. Hatef H M. Singh University of Western Ontario London ON Canada e-mail ahatef@ and opto-electronic devices 5 . Since the formation of the PBG is due to the multiple Bragg reflections within a PC ordinary PCs are a .