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- W2001206758 abstract "We are developing a hot-electron superconducting transition-edge sensor (TES) that is capable of counting THz photons and operates at T = 0.3K. The main driver for this work is moderate resolution spectroscopy (R ~ 1000) on the future space telescopes with cryogenically cooled (~ 4 K) mirrors. The detectors for these telescopes must be background-limited with a noise equivalent power (NEP) ~ 10<sup>-19</sup>-10<sup>-20</sup> W/Hz<sup>1/2</sup> over the range ν=0.3-10 THz. Above about 1 THz, the background photon arrival rate is expected to be ~ 10-100 s<sup>-1</sup>, and photon counting detectors may be preferable to an integrating type. We fabricated superconducting Ti nanosensors with a volume of ~ 3×10<sup>-3</sup> μm<sup>3</sup> on planar Si substrate and have measured the thermal conductance G to the thermal bath. A very low G=4×10<sup>-14</sup> W/K, measured at 0.3 K, is due to the weak electron-phonon coupling in the material and the thermal isolation provided by superconducting Nb contacts. This low G corresponds to NEP(0.3K) = 3×10<sup>-19</sup> W/Hz<sup>1/2</sup>. This Hot-Electron Direct Detector (HEDD) is expected to have a sufficient energy resolution for detecting individual photons with ν > 0.3 THz at 0.3 K. With the sensor time constant of a few microseconds, the dynamic range is ~ 50 dB." @default.
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- W2001206758 date "2006-06-14" @default.
- W2001206758 modified "2023-10-03" @default.
- W2001206758 title "An untrasensitive hot-electron bolometer for low-background SMM applications" @default.
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