OPTICAL ELEMENT, LIGHT SOURCE DEVICE AND PROJECTION-TYPE DISPLAY DEVICE

摘要

This invention lowers the etendue of light emitted from an optical element regardless of the etendue of the optical element, and is provided with: a carrier generation layer which generates carriers by means of light; a plasmon excitation layer which is laminated on the carrier generation layer and which has a plasma frequency higher than that of the light generated when the carrier generation layer is excited by light from the light-emitting element; an emission layer which is laminated on the plasmon excitation layer and which converts surface plasmons generated by the plasmon excitation layer into light having a prescribed exit angle and emits the same; and an anisotropic dielectric layer having one or more optical anisotropies provided on the entrance side from the plasmon excitation layer towards the carrier generation layer.