CAO Lei,HOU Ying,ZHANG Li.Design and simulation of bias-selectable few photon dual-colour photodetector operating in visible and near-infrared regions[J].Optoelectronics Letters,2020,16(5):333-337 Design and simulation of bias-selectable few photon dual-colour photodetector operating in visible and near-infrared regions Author Name Affiliation CAO Lei  Department of Electronics Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China  HOU Ying  Department of Electronics Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China  ZHANG Li  Department of Electronics Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China  Abstract:       In this paper, we report the design and simulation of a bias-selectable dual-band photodetector operating in the visible (VIS) and near infrared (NIR) regions. The photodetector consists of two back-to-back avalanche photodiodes (APDs) with InGaAs and Si absorption layers respectively. The structure and electrical and optical properties of the dual-color photodetector were designed and simulated by exploiting Silvaco software. The results obtained on the basis of numerical simulation include the current-voltage, capacitance-voltage, spectral response, etc. The optical simulation shows the detection capability in the VIS and NIR ranges, cut-off wavelengths of 1.0 ?m and 1.8 ?m depending on the applied bias polarity. Comparing with using the PIN structure as element device, the dual-band photodetector based on the APD configuration could detect the very weak signal, realizing few photons, even single photon detection. Hits: 1506 Download times: 0 View Full Text    Download reader