OPTICAL DEVICE AND ORGANIC EL DISPLAY

摘要

first waveguide layers (41, 42) in which repetition reflection interference is generated; a second waveguide layer (10) having a rear surface opposing to the first waveguide layers (41, 42) and a front surface as a light emitting surface; and a diffraction grating arranged at the rear surface side of the second waveguide layer (10) so as to face the first waveguide layers (41, 42). A primary diffraction light is generated by incoming of the light of maximum intensity among the lights propagating toward inside the surface while being multiplex-reflected in the first waveguide layers (41, 42), into the diffraction grating (30). The diffraction grating (30) has a grating constant defined so that the primary diffraction light can be emitted from the second waveguide layer (10).