Affiliation:
1. Nanjing University
2. Purple Mountain Laboratories
Abstract
A superconducting nanowire single-photon imager (SNSPI) uses a time-multiplexing method to reduce the readout complexity. However, due to the serial connection, the nanowire should be uniform so that a common bias can set all segments of the nanowire to their maximum detection efficiency, which becomes more challenging as the scalability (i.e., the length of the nanowire) increases. Here, we have developed a 64-pixel SNSPI based on amorphous Mo80Si20 film, which yielded a uniform nanowire and slow transmission line. Adjacent detectors were separated by delay lines, giving an imaging field of 270 µm × 240 µm. Benefiting from the high kinetic inductance of Mo80Si20 films, the delay line gave a phase velocity as low as 4.6 µm/ps. The positions of all pixels can be read out with a negligible electrical cross talk of 0.02% by using cryogenic amplifiers. The timing jitter was 100.8 ps. Saturated internal quantum efficiency was observed at a wavelength of 1550 nm. These results demonstrate that amorphous film is a promising material for achieving SNSPIs with large scalability and high efficiency.
Funder
National Natural Science Foundation of China
National Key Research and Development Program of China
Jiangsu Provincial Key Laboratory of Advanced Manipulating Technique of Electromagnetic Wave
Priority Academic Program Development of Jiangsu Higher Education Institutions
Fundamental Research Funds for the Central Universities
Program for Innovative Talents and Entrepreneur in Jiangsu
Subject
Atomic and Molecular Physics, and Optics
Cited by
2 articles.
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