DESIGN subwavelength gratings in resonant cavity enhanced (RCE) photodetectors

Yisu Yang; Yongqing Huang; Hui Huang; Qi Wang; Xiaomin Ren

doi:10.1117/12.851265

2 December 2009 DESIGN subwavelength gratings in resonant cavity enhanced (RCE) photodetectors

Yisu Yang, Yongqing Huang, Hui Huang, Qi Wang, Xiaomin Ren

Proceedings Volume 7631, Optoelectronic Materials and Devices IV; 76311N (2009) https://doi.org/10.1117/12.851265
Event: Asia Communications and Photonics, 2009, Shanghai, Shanghai , China

Abstract

Two-dimensional subwavelength gratings (2D-SWGs) that consist of net-grid structure are studied by rigorous coupledwave approach (RCWA) and finite-difference-time-domain (FDTD) method. 2D-SWGs can be designed as infrared reflectors whose reflectivity can reach 99.98% at 1.55μm while maintaining reflectivity higher than 99% across the 1.47- 1.59μm wavelength range. We design these SWGs as the bottom mirrors in resonant cavity enhanced photodetectors (RCE-PDs) for optical communication system. Because SWGs can achieve high reflectivity as well as wide bandwidth, RCE PD's quantum efficiency is increased to 95.7% at 1.55μm and the device has a significant size reduction compared with using DBR bottom mirror.

Citation Download Citation

Yisu Yang, Yongqing Huang, Hui Huang, Qi Wang, and Xiaomin Ren "DESIGN subwavelength gratings in resonant cavity enhanced (RCE) photodetectors", Proc. SPIE 7631, Optoelectronic Materials and Devices IV, 76311N (2 December 2009); https://doi.org/10.1117/12.851265

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