OPTICAL DEVICE AND IMAGE DISPLAY DEVICE

摘要

Provided is an optical device and image display device capable of improving absorption efficiency of excited light. This optical device (1) is equipped with: light emitting elements (101a, 101b); a carrier generation layer (103) upon which light from the light emitting elements (101a, 101b) is incident and carriers are generated; a plasmon excitation layer (105) for exciting plasmons and having a plasma frequency higher than the frequency of light generated when the carrier generation layer (103) is excited by light from the light emitting elements (101a, 101b), the plasmon excitation layer being layered on top of the carrier generation layer (103); and a light emission layer (107) for emitting light by converting the surface plasmons or the light generated on the surface of the plasmon excitation layer (105) to light with a predetermined emission angle; the incident angle of light incident upon the carrier generation layer (103) being 40 degrees or greater.