Patent ID: 8466528
Filing Date: 2013-06-18
Classification: H01L

Abstract:
1. A semiconductor light-receiving element comprising: a semiconductor layer that includes a light-absorbing layer; a metal periodic structure that is provided over the semiconductor layer, forms a Schottky junction with the semiconductor layer, and includes a slit-like opening, the metal periodic structure having a period capable of exciting surface plasmon to incident light of polarization vertical to a longitudinal axial direction of the slit-like opening and thickness capable of obtaining sufficient transmittance to the incident light of the polarization parallel to the longitudinal axial direction of the slit-like opening; an anti-reflection film that is formed over the semiconductor layer and the metal periodic structure; and a semiconductor multilayer reflective film that is provided to a lower part of the semiconductor layer; wherein a Fabry Perot resonator is formed between the metal periodic structure and the semiconductor multilayer reflective film to any incident light of the polarization vertical to and the polarization parallel to the longitudinal axial direction of the slit-like opening, the semiconductor layer comprises: an upper spacer layer that is formed between the light-absorbing layer and the metal periodic structure, the upper spacer layer being composed of semiconductor transparent to the incident light; and a lower spacer layer that is provided to the lower part of the light-absorbing layer and adjusts a phase in the Fabry Perot resonator, the lower spacer layer being composed of semiconductor transparent to the incident light, and light diffracted by the metal periodic structure is coupled to the light-absorbing layer, and when a thickness of the metal periodic structure is T, a width interval ratio is R, an incident light wavelength is λ, and the refractive index of the anti-reflection film is n1, 0.05<n