Patent ID: 7768689
Filing Date: 2010-08-03
Classification: B82Y,G02B,H01L

Abstract:
1. A photo detector with a plasmon focusing antenna, comprising: an electrically conductive thin film which has an first surface, a second surface opposite to the first surface and a coupling periodic structure provided on the first surface, the electrically conductive thin film configured to convert incidence light to surface plasmon and including an opening penetrating the first surface and the second surface within the coupling periodic structure, and the opening being formed of a cross slit defined by two slits intersecting with each other at right angle, each of the slit having long sides longer than half a wavelength of the surface plasmon and short sides shorter than half the wavelength of the surface plasmon; and a light-receiving unit configured to receive the surface plasmon and arranged at one end of the opening in the second surface.