Title :
Net-grid subwavelength gratings as reflectors for designing resonant cavity enhanced photodetectors
Author :
Yang, Yisu ; Huang, Yongqing ; Xiaomin, Ren
Author_Institution :
Key Laboratory of Information Photonics and Optical Communications (BUPT), Ministry of Education; Institute of Optical Communication and Optoelectronics, Beijing University of Posts and Telecommunications. P.O.Box 66, Xitucheng Rd. No.10. 100876, China
Abstract :
Subwavelength gratings (SWGs) that consist of net-grid patterns which have periods distributed in 2 dimensions are studied by rigorous coupled-wave approach (RCWA) and finite-difference-time-domain (FDTD) method. SWGs can be designed as infrared reflectors with reflectivity of 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 device size reduction.
Keywords :
Finite difference methods; Gratings; Mirrors; Optical design; Optical fiber communication; Photodetectors; Reflectivity; Reluctance generators; Resonance; Time domain analysis;
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
