LIGHT-EMITTING DEVICE HAVING DIFFRACTIVE OPTICAL FILM ON LIGHT EMISSION SURFACE AND METHOD FOR MANUFACTURING SAME

摘要

A light-emitting device having a practical, small diffractive optical film on the light emission surface is efficiently manufactured at low cost. The light-emitting device (LD) is provided with a diffractive optical film (DF) on the light emission surface. The diffractive optical film (DF) comprises a translucent DLC (diamond-like carbon) layer, and this translucent DLC layer includes a modulated refractive-index diffraction grating having a local region of a relatively high refractive index and another local region of a relatively low refractive index.