[15p-B508-1~7] 3.16 Optics and Photonics English Session

▲ [15p-B508-4] Design of ultra-thin InGaAs membrane photodetector on Si slot waveguide

〇(M2)Dongrui Wu¹, Kasidit Toprasertpong¹, Shinichi Takagi¹, Mitsuru Takenaka¹ (1.University of Tokyo)

Keywords:photodetector, slot waveguide

A photodetector (PD) is one of the critical devices in a photonic network, which limits the communication capacity due to its huge energy consumption. In particular, the trans-impedance amplifier (TIA) for photodetection introduces an extra power consumption, footprint, and noise. One solution is to employ a receiver-less configuration where a load resistor with high impedance is used to convert photocurrent into voltage without a TIA. Such configuration requires an ultra-low capacitance (~fF) PD to maintain a high RC-limited bandwidth. In this study, we propose an ultra-thin InGaAs membrane photodetector on a Si slot waveguide, which is able to achieve high-responsivity, low capacitance, and high bandwidth simultaneously.