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, 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. Electrical Engineering Faculty Publications and Presentations. Retrieved from https://scholarworks.uark.edu/elegpub/2