Normal Metal Cold-Electron Bolometer: Response, Noise, and Electron Cooling

摘要: In the last decade superconducting bolometers became most sensitive radiation detectors of Sub-mm, Infrared, and Optical with an estimated ultimate sensitivity down to 10−20 W/Hz1/2. At present developed bolometer is a transition-edge sensor (TES). However, TES performance limited by excess noise, overheating dc feedback power, background power load. To avoid this overheating, new concept cold-electron direct electron cooling has been proposed. The unique thermal transport properties SIN tunnel junction can be used remove hot electrons from absorber in order cool well below lattice. optimal realization proved two capacitive coupling antenna junctions. Recently 300 mK 100 have demonstrated samples improved trapping quasiparticles superconductor. Experimental noise equivalent NEP=10 −17 W/Hz1/2 consistent optical NEP measured using black-body source inside cryostat. Influence leakage resistance on studied both experimentally numerically. With use such we Josephson at submillimeter waves.