Actlight DPD Article

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Laser Focus World publishes Lausanne, Switzerland-based Actlight article "Dynamic photodiodes reach single-photon sensitivity at low voltages, with minimal noise" by Maxim Gureev (Actlight CTO) and Denis Sallin (Director of Engineering). Few quotes:

"ActLight’s dynamic photodiode (DPD) uses a new operating mode that converts light intensity into time.1-3 The applied voltage is not constant, but is switched from reverse to forward bias. Applied forward bias induces a large forward current that doesn’t start immediately, but after a time delay (see Fig. 1). The forward current magnitude is controlled only by the applied voltage, and its value does not depend on the light intensity. In contrast, the delay time (triggering time) is a function of the absorbed light power."

"With CMOS compatibility, a high-amplitude output signal, low noise, and low voltage operation, the DPD can also be tuned to reach single-photon sensitivity. This could dramatically enhance the performance of wearable devices and smartphones."

"ActLight developed an iToF method using its DPD that can be manufactured with a standard CMOS or CMOS Image Sensor (CIS) process. The low-voltage iToF range meter demonstrator allows measurement at distances up to 5 m in a wide range of lighting conditions (see Fig. 3). Furthermore, it has demonstrated full sun (>100 klux) background light immunity."

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