Simultaneous Realization of Coherent Perfect Absorber and Laser by Zero-Index Media with both Gain and Loss
Abstract
We investigate a unique type of zero-index medium with both gain and loss (ZIMGL), whose effective permittivity and permeability are purely imaginary and of opposite signs. We show analytically that, by using a slab of ZIM-GL with equal magnitude of loss and gain, coherent perfect absorber (CPA) and laser, i.e. the socalled CPA-laser, can be achieved simultaneously. CPA-laser has been found previously in parity-time (PT) symmetric systems. However, the underlying physics in a PT-symmetric system is distinct from that in a ZIM-GL. By designing a photonic crystal (PC) composed of core-shell rods, with loss and gain distributed in either the core or the shell, we have realized such a ZIM-GL. The CPA-laser functionality of such a PC is also confirmed in our numerical simulations. Our work provides a different approach for simultaneous realization of CPA and laser besides PTsymmetric systems.
Keywords
Cite
@article{arxiv.1608.07003,
title = {Simultaneous Realization of Coherent Perfect Absorber and Laser by Zero-Index Media with both Gain and Loss},
author = {Ping Bai and Kun Ding and Gang Wang and Jie Luo and Zhao-Qing Zhang and C. T. Chan and Ying Wu and Yun Lai},
journal= {arXiv preprint arXiv:1608.07003},
year = {2016}
}
Comments
20 pages, 5 figures