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Indium Antimonide Hot Electron Bolometer

• Spectral Response: 0.2mm to 5mm
• Operating Temperature: 4.2 K
• High Speed

When cooled to liquid helium temperatures, absorption of radiation by free carrier electrons causes the mean temperature of the electrons (T_o) to rise above that of the host lattice. Electron mobility is proportional to T_o ^3/2, hence this temperature rise can be sensed as a change in conductivity. The very low thermal mass of the free electrons, coupled with short energy relaxation times of about 10^-7 seconds, leads to a very fast and sensitive sub millimeter wave detector.

This detector uses a specially shaped high purity N-type InSb crystal which may be coupled directly to a very low noise preamplifier.

Detector Area (mm):  5 x 5
Detector Mounting:  Sapphire substrate set into an integrating cavity
Operating Temperature (K):  4.2 & 1.5
Spectral Response (mm):  0.2 _{- 5}
Frequency Response - 3db (kHz):  600
NEP (w/Hz½):  < 8 x 10_-13