Title :
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
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;
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
