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.
Highlights
In the past few decades, there has been a growing interest in the development of artificial nano-materials
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
According to Fermi’s ‘Golden Rule’, the decay rate is proportional to the local density of states (LDOS) that counts the number of electromagnetic modes available to the photons for emission into the environment
Summary
In the past few decades, there has been a growing interest in the development of artificial nano-materials. Nanoscale Res Lett (2010) 5:464–468 applications such as high-efficiency light sources [13] and thermal photovoltaic power generation [14]. Besides these advantages, PCs can be used for radiation suppression and emission enhancement below the electronic band gap and near a photonic band edge, respectively, where a PC functions as a reservoir for an exited light emitter or active medium such as an atom, a molecule or a quantum dot (QD). Dark states with zero absorption amplitude would appear causing the multi-level atomic system to act like a transparent medium, which has potential applications for optical switches and photonic devices [27, 28]. We consider that the QDs are four–energy level systems where the two upper levels are very close, coupled to a lower one via the same and single field continuum and damped by the MPC interaction
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