Hideo Kosaka

TL;DR: In this article, a super-prism phenomenon was demonstrated at optical wavelength in photonic crystals with three-dimensional-periodic structure fabricated on Si substrate, where the incident-angle dependence including negative refraction and multiple beam branching was interpreted from highly anisotropic dispersion surfaces derived by photonic band calculation.

TL;DR: In this article, self-determining collimated light is generated in a photonic crystal fabricated on silicon and the divergence of the collimated beam is insensitive to that of the incident beam and much smaller than the divergence generated in conventional Gaussian optics.

TL;DR: In this article, a light-beam steering that is extremely wavelength dependent has been demonstrated by using photonic crystals fabricated on Si. The scanning span reached 50° with only a 1% shift of incident wavelength at around 1 μm.

TL;DR: In this article, the authors demonstrated 1.55 μm wavelength lightwave propagation through a 120° sharply bent waveguide formed in a triangular-lattice two-dimensional photonic crystal (2D PC).

TL;DR: In this article, the superprism phenomenon was demonstrated at optical wavelengths in photonic crystals (PC's) fabricated on Si, achieving a scanning span of 50/spl deg/ with only a 1% shift of incident wavelength.