Photocurrent spectrum study of a quantum dot single-photon detector based on resonant tunneling effect with near-infrared response

Journal Article · Mon Jul 21 04:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4890022· OSTI ID:22311356

Weng, Q. C. ^[1]; Xiong, D. Y.; Zhu, Z. Q. ^[2]; Zhang, B.; Chen, P. P.; Li, T. X.

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1. National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083 (China)
2. Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai 200241 (China)

We present the photocurrent spectrum study of a quantum dot (QD) single-photon detector using a reset technique which eliminates the QD's “memory effect.” By applying a proper reset frequency and keeping the detector in linear-response region, the detector's responses to different monochromatic light are resolved which reflects different detection efficiencies. We find the reset photocurrent tails up to 1.3 μm wavelength and near-infrared (∼1100 nm) single-photon sensitivity is demonstrated due to interband transition of electrons in QDs, indicating the device a promising candidate both in quantum information applications and highly sensitive imaging applications operating in relative high temperatures (>80 K).

• OSTI ID: 22311356
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 3 Vol. 105; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DETECTION
EFFICIENCY
ENERGY-LEVEL TRANSITIONS
EQUIPMENT
MONOCHROMATIC RADIATION
NEAR INFRARED RADIATION
PHOTODETECTORS
PHOTONS
QUANTUM DOTS
QUANTUM INFORMATION
SENSITIVITY
SPECTRA
TUNNEL EFFECT
VISIBLE RADIATION
WAVELENGTHS