Coherent Perfect Absorption Laser Points in One-Dimensional Anti-Parity–Time-Symmetric Photonic Crystals

Applied Sciences

Pu Zhang¹  Weihao Kong¹  Zhongming Li¹  Dong Zhong¹  Huiling Wang² 

[1] Hubei University of Science and Technology, Xianning 437100, China;School of Innovation and Entrepreneurship, Xianning Vocational Technical College, Xianning 437100, China;

关键词: coherent perfect absorption;    laser point;    anti-PT symmetry;    photonic crystal;    Goos–Hänchen shift;   

DOI  :  10.3390/app9132738

来源: DOAJ

【 摘 要 】

We investigate the coherent perfect absorption laser points (CPA-LPs) in anti-parity−time-symmetric photonic crystals. CPA-LPs, which correspond to the poles of reflection and transmission, can be found in the parameter space composed of gain−loss factor and angular frequency. Discrete exceptional points (EPs) split as the gain−loss factor increases. The CPA-LPs sandwiched between the EPs are proved to be defective modes. The localization of light field and the bulk effect of gain/loss in materials induce a sharp change in phase of the reflection coefficient near the CPA-LPs. Consequently, a large spatial Goos−Hänchen shift, which is proportional to the slope of phase, can be achieved around the CPA-LPs. The study may find great applications in highly sensitive sensors.

【 授权许可】

Unknown