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Updated: Jun 7, 2025
Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
A superior coherent perfect absorber and laser constructed from the periodic ring optical waveguide network based on
Yao Zhang1,2, Xiangbo Yang3,4, Mengli Huang1,2
1Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou, 510006, China.
Abstract:
In this study, we propose a superior coherent perfect absorber and laser (CPA laser) constructed from the one-dimensional (1D) two-material (TM) parity-time (PT) symmetric periodic ring optical waveguide network (PROWN). A novel method based on seeking the exact extremum spontaneous PT-symmetric breaking points is used for determining the imaginary part of the refractive indices of the materials composed of waveguides. The minimal overall output coefficient [Formula: see text] and maximal transmissivity [Formula: see text] can reach [Formula: see text] and [Formula: see text], respectively, which are 9 orders of magnitude smaller and larger than the previously reported values, respectively. It is also found that with the increment of unit cells, [Formula: see text] increases monotonically while [Formula: see text] decreases monotonically. Moreover, [Formula: see text] and [Formula: see text] are found to be varied with the periodicity of 1.866152 MHz. Our work provides a new method for optimizing CPA lasers.
