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SUMMARY:High-sensitivity superconducting detectors for mm/submm/THz astron
 omy - Professor Sheng-Cai Shi\, Purple Mountain Observatory\, Chinese Acad
 emy of Sciences\, China
DTSTART:20151214T141500Z
DTEND:20151214T151500Z
UID:TALK62139@talks.cam.ac.uk
CONTACT:Teri Bartlett
DESCRIPTION:Abstract: About half of the photon energy in our universe is f
 rom mm and submm as well as THz wavelengths. At these wavelengths\, we can
  observe early distant objects including the cosmic microwave background\,
  most cold objects\, and obscured objects invisible in the optical. In add
 ition\, there are abundant molecular spectral lines and fine atomic struct
 ure spectral lines -- important tracers for probing the physical and chemi
 cal properties and dynamic processes of objects such as stars and planetar
 y systems. Compared with other frequency regimes\, however\, the mm/submm/
 THz regime is still to be fully explored. One reason is the strong absorpt
 ion by the earth’s atmosphere and the other due to the lack of sensitive
  detectors. The advancement of low-temperature superconducting detectors m
 akes the detection sensitivity of mm/submm/THz radiation approaching the q
 uantum limit in coherent mode and background limit in incoherent mode. The
 y are playing an increasingly important role in cosmology and astrophysics
 . This talk will firstly introduce the device physics of low-temperature s
 uperconducting detectors mainly used in astronomy including superconductor
 -insulator-superconductor (SIS) mixers (i.e.\, coherent detectors)\, hot-e
 lectron-bolometer (HEB) mixers\, transition-edge-sensor (TES) detectors\, 
 and microwave kinetic inductance detectors (MKID). Some latest development
  results will then be presented. Finally\, I will introduce Dome A 5m Tera
 hertz Telescope (DATE5) project\, which is to be build at Dome A in Antarc
 tic -- the best site on earth for astronomical observations in the THz reg
 ime.
LOCATION:Small Lecture Theatre\, Bragg Building\, Room 133\, Cavendish Lab
 oratory\, Department of Physics
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