Light source and projection-type display device

摘要

A light source capable of solving a problem in which the etendue is increased when random polarization is converted into a specific polarization is provided. A relief structure that functions as surface plasmon excitation means for exciting a surface plasmon by a specific polarization component in a polarization direction perpendicular to a first direction in an interface between metal layer 15 and first cover layer 14 in light from emission layer 13 incident on the interface is formed at the interface. The relief structure is periodic in a second direction. Projections 21A of the relief structure are extended along the first direction. A light generation means for generating light having the same polarization component as the particular polarization component from the surface plasmon generated at the interface between metal layer 15 and first cover layer 14 according to the surface plasmon excited by the particular polarization component through the surface plasmon excitation means is formed at the interface between metal layer 15 and second cover layer 16.

主权项

1. A light source comprising:
an emission layer; and a first transparent dielectric layer, a metal layer and a second transparent dielectric layer stacked in this order on said emission layer, wherein a relief structure that functions as surface plasmon excitation means for exciting a surface plasmon by a particular polarization component, in a polarization direction perpendicular to a first direction coplanar with an interface between said metal layer and said first transparent dielectric layer, in light from said emission layer incident on the interface is formed at the interface, the relief structure being periodic in a second direction perpendicular to the first direction in the interface, respective projections of the relief structure being extended along the first direction, and wherein light generation means for generating light having the same polarization component as the particular polarization component from the surface plasmon generated at the interface between said metal layer and said first transparent dielectric layer according to the surface plasmon excited by the particular polarization component through the surface plasmon excitation means is formed at an interface between said metal layer and said second transparent dielectric layer.