Gate voltage tuning of photo-responses in n-AlGaAs/GaAs/AlGaAs double-heterojunction

We demonstrate that the gate voltage V-g tunes the Schottky photocurrent I-SG for the irradiation of two lights (Light A and B) in an n-AlGaAs/GaAs/AlGaAs double-heterojunction. Light A is a 975-nm laser that illuminates the entire Schottky gate region at 280 mu W/mm(2). Light B is a 670-nm laser that locally illuminates the ungated region at 0.4 mu W. When V-g = 0 V, Light B doubles I-SG for Light A. At V-g = 87 mV, I-SG is generated only when both Light A and B are irradiated simultaneously, like the logical operation A boolean AND B. When V-g = 165 mV, I-SG is induced only for the illumination of Light A alone, like A boolean AND(B) over bar. (c) 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International (CC BY-NC-ND) license (https://creativecommons.org/licenses/by-nc-nd/4.0/).