Optical element, light source device, and projection display device

摘要

Disclosed is an optical element that includes: carrier generation layer (16) in which carriers are generated by light from light guide body (12) into which light from a light-emitting element enters; plasmon excitation layer (17) that has a plasma frequency higher than the frequency of light generated when carrier generation layer (16) is excited by light from the light-emitting element; and wave vector conversion layer (18) that converts surface plasmon generated by plasmon excitation layer (17) light having a predetermined exit angle to output the light. Plasmon excitation layer (17) is sandwiched between two layers having dielectric properties. The effective dielectric constant of the incident side portion of plasmon excitation layer (17) including an entire structure stacked above light guide body (12) side is higher than that of the exit side portion of plasmon excitation layer (17) including the entire structure stacked above wave vector conversion layer (18) side and the medium in contact with wave vector conversion layer (18).

主权项

1. An optical element comprising:
a light guide body into which light from a light-emitting element enters; a carrier generation layer formed in the light guide body, in which carriers are generated by the light from the light guide body; a plasmon excitation layer stacked above the carrier generation layer, which has a plasma frequency higher than a frequency of light generated when the carrier generation layer is excited by the light from the light-emitting element; and an exit layer stacked above the plasmon excitation layer, which converts a surface plasmon generated by the plasmon excitation layer into light having a predetermined exit angle to output the light, wherein the plasmon excitation layer is sandwiched between two layers having dielectric properties; and an effective dielectric constant of an incident side portion of the plasmon excitation layer including an entire structure stacked above the light guide body side is higher than that of an exit side portion of the plasmon excitation layer including an entire structure stacked above the exit layer side and a medium in contact with the exit layer.