DESIGN subwavelength gratings in resonant cavity enhanced (RCE) photodetectors

Author

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

Author_Institution

Key Laboratory of Information Photonics and Optical Communications (BUPT), Ministry of Education; Beijing University of Posts and Telecommunications.#66,Xitucheng Road No.10, 100876, China

Volume

2009-Supplement

fYear

2009

fDate

2-6 Nov. 2009

Firstpage

1

Lastpage

10

Abstract

Two-dimensional subwavelength gratings (2D-SWGs) that consist of net-grid structure are studied by rigorous coupled-wave 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.

Keywords

Finite difference methods; Gratings; Mirrors; Optical design; Optical fiber communication; Photodetectors; Reflectivity; Reluctance generators; Resonance; Time domain analysis; Subwavelength gratings; optical communication; optoelectronics; resonant cavity photodetectors;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications and Photonics Conference and Exhibition (ACP), 2009 Asia

Conference_Location

Shanghai, China

Print_ISBN

978-1-55752-877-3

Electronic_ISBN

978-1-55752-877-3

Type

conf

Filename

5405257