Non-avalanche single photon detection without carrier transit-time delay through quantum capacitive coupling
Quantum dot, single photon
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, Y., Wu, Y., Wang, X., Fossum, E. R., Kumar, R., Liu, J., Salamo, G., & Yu, S. (2017). Non-avalanche single photon detection without carrier transit-time delay through quantum capacitive coupling. Optics Express, 25 (22), 26508-26518. https://doi.org/10.1364/OE.25.026508