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Vol. 190, Issue 7, July 2015, pp. 19-23




Multimode Fiber Coupled Superconducting Nanowire Transition Edge Sensor for Detection of Single-Photon
at Optical and Near-Infrared Wave Lengths

1 Venkata Naga Vamsi Annepu, 2 Bhujanga Rao. Annepu, 3 Venkata Lakshmi Narayana K.

1 Dept. of Electronics and Instrumentation Engineering, GITAM University
2 Dept. of Instrument Technology, Andhra University, Visakhapatnam, India
3 School of Electrical Engineering, VIT University, Vellore
1 Tel.: +91- 9550417485

1 E-mail: vamsi9441105975@gmail.com


Received: 26 June 2015 /Accepted: 27 July 2015 /Published: 31 July 2015

Digital Sensors and Sensor Sysstems


Abstract: We report the development of the multimode fiber-coupled superconducting nanowire transition edge sensor with high system detection efficiency at optical and near-infrared wavelength. The SNTES consists of an absorber, a sensitive thermometer, and a weak thermal link to a cold bath, For a SNTES optimized to detect single photons, the temperature change caused by the absorption of a single photo is read out by the thermometer, and the system resets by cooling through the thermal link. The graded index (GRIN) lenses were spliced to the end of the multi mode fiber with a 50 m diameter core, and the incident light spot diameter was focused to approximately 20 m at the active area, which is 28 m diameter, allowing a good optical coupling. We have achieved a nominal coupling efficiency of 91 % and system efficiency of 76 % by the SNTES at 1310 nm -1350 nm. The developed practical SNTES presented in this paper could open a new frontier for a wide range of applications at optical and infrared wavelength.


Keywords: Laser communication, Multi-mode fiber, Photon detector, Transistion edge sensor, Detection efficiency.


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