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Title: Single-crystalline Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+x} detectors for direct detection of microwave radiation

We test radiation detectors made from single-crystalline Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+x} flakes put on oxidized Si substrates. The 100-nm-thick flakes are lithographically patterned into 4×12 μm{sup 2} large rectangles embedded in thin-film log-spiral antennas. The SiO{sub 2} layer weakens the thermal link between the flakes and the bath. Two modes of radiation detection have been observed. For a bolometric type of sensors a responsivity of ∼300 V/W and a noise equivalent power of 30 nW/√(Hz) has been deduced at 70 K. Much more sensitive is the non-bolometric device showing characteristics similar to a Golay-type detector while being at least a thousand times faster. Making smaller (sub-μm) structures is expected to significantly improve the performance of these devices and makes them very competitive among other microwave and terahertz detectors.
Authors:
; ;  [1]
  1. Department of Microtechnology and Nanoscience - MC2, Chalmers University of Technology, SE-41296 Gothenburg (Sweden)
Publication Date:
OSTI Identifier:
22398901
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 15; Other Information: (c) 2015 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; ANTENNAS; BISMUTH COMPOUNDS; BOLOMETERS; CALCIUM COMPOUNDS; CUPRATES; LAYERS; MICROWAVE RADIATION; MONOCRYSTALS; NOISE; PERFORMANCE; RADIATION DETECTION; RADIATION DETECTORS; SENSORS; SILICON; SILICON OXIDES; STRONTIUM COMPOUNDS; SUBSTRATES; THIN FILMS