| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a superconductive photodetector which can obtain higher quantum efficiency in detecting a single photon. <P>SOLUTION: A fine line (102) formed of a superconductive photodetective material is disposed closely in a surface of a crystal substrate (101) in a meander shape. Another meander fine line (103) is disposed in a rear surface of a crystal substrate or an upper layer via an insulating film in a position corresponding to a clearance of the meander fine line. Thereby, a plurality of sets of meander fine lines are shifted mutually and set in piles almost without a clearance. Photon (104) irradiated to a clearance of the first meander fine line (102) is irradiated to the next meander fine line (103), all photons are irradiated to any of fine lines, and there remains no untreated photon in a light irradiation region, thus remarkably improving quantum efficiency. <P>COPYRIGHT: (C)2008,JPO&INPIT |
