OPTICAL ELEMENT, ILLUMINATION DEVICE, AND PROJECTION DISPLAY DEVICE

摘要

Provided is an optical element capable of increasing the optical strength of fluorescent light, while suppressing an increase in size. A light-guide plate (21) propagates light incident from a light source (1). A fluorescent body layer (22) for emitting fluorescent light using the light from the light-guide plate (21) is positioned on the light-guide plate (21). A metallic layer (23) is layered on the fluorescent body layer (22). There is a diffraction grating formed at the interface between the fluorescent body layer (22) and the metallic layer (23).