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Title: Large area photodetector based on microwave cavity perturbation techniques

We present a preliminary study to develop a large area photodetector, based on a semiconductor crystal placed inside a superconducting resonant cavity. Laser pulses are detected through a variation of the cavity impedance, as a consequence of the conductivity change in the semiconductor. A novel method, whereby the designed photodetector is simulated by finite element analysis, makes it possible to perform pulse-height spectroscopy on the reflected microwave signals. We measure an energy sensitivity of 100 fJ in the average mode without the employment of low noise electronics and suggest possible ways to further reduce the single-shot detection threshold, based on the results of the described method.
Authors:
; ;  [1] ; ;  [2]
  1. Dip. di Fisica e Astronomia and INFN Sez. di Padova, Via F. Marzolo 8, I-35131 Padova (Italy)
  2. INFN, Laboratori Nazionali di Legnaro, Viale dell'Università 2, I-35020 Legnaro (Italy)
Publication Date:
OSTI Identifier:
22308569
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CAVITY RESONATORS; CRYSTALS; DETECTION; FINITE ELEMENT METHOD; MICROWAVE RADIATION; NOISE; PERTURBATION THEORY; PHOTODETECTORS; PULSES; SEMICONDUCTOR MATERIALS; SENSITIVITY; SIMULATION; SPECTROSCOPY; SUPERCONDUCTING CAVITY RESONATORS