| 摘要 |
The present invention provides a technique of reducing an incident/outgoing loss of a photonic crystal. On each of incident/outgoing sides of a photonic crystal, an antireflection layer made of a photonic crystal is disposed. At the incident side of a photonic crystal 200 having an effective refractive index n2, a photonic crystal 100 having an effective refractive index n1 satisfying the relation of n1<N2 is disposed, and the thickness of the photonic crystal 100 is controlled so that reflection components from interfaces 210 and 110 cancel each other out by interference, thereby reducing a total reflection loss on the incident side. The outgoing side is similarly constructed.
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