OPTICAL DEVICE, AND PRODUCTION METHOD FOR PHOTONIC CRYSTAL SLAB

摘要

It has been desired that light be confined with respect to a direction having no cycle of a photonic crystal using a simpler optical system. An optical device comprising a GI type photonic crystal slab (4) having a first member with a refractive index distribution (12) decreasing toward opposite directions from an optical axis (20) with respect to a first direction orthogonal to the optical axis (20) of an incident light and a second member practically cyclically disposed in the first member with respect to a second direction different from the first direction, wherein the refractive index distribution (12) with respect to the first direction of the first member, the thickness with respect to the first direction of the GI type photonic crystal slab (4), the wavelength of an incident light, and an incident end beam spot radius omega1 with respect to the first direction on the inner side of the light incident end (9) of the GI type photonic crystal slab (4) to which light is incident are determined so as practically confine an incident light within the GI type photonic crystal slab (4) with respect to the first direction.