Non-avalanche single photon detection without carrier transit-time delay through quantum capacitive coupling
Searching for innovative approaches to detect single photons remains at the center of science and technology for decades. This paper proposes a zero transit-time, non-avalanche quantum capacitive photodetector to register single photons. In this detector, the absorption of a single photon changes the wave function of a single electron trapped in a quantum dot (QD), leading to a charge density redistribution nearby. This redistribution translates into a voltage signal through capacitive coupling between the QD and the measurement probe. Using InAs QD/AlAs barrier as a model system, the simulation shows that the output signal reaches ~4 mV per absorbed photon, promising for high-sensitivity, ps single-photon detection.
Zhang, Yang; Wu, Yang; Wang, Xiaoxin; Fossum, Eric R.; Kumar, Rahul; Liu, Jifeng; Salamo, Gregory; and Yu, Shui-Qing, "Non-avalanche single photon detection without carrier transit-time delay through quantum capacitive coupling" (2017). Electrical Engineering Faculty Publications and Presentations. 2.