Patent ID: 7310468

Claim:
A photonic crystal waveguide comprising: a core formed of a photonic crystal having periodicity in a first direction and propagating an electromagnetic wave in a second direction perpendicular to the first direction, the core comprising a photonic band structure having a Brillouin zone boundary and a photonic band thereon comprising a propagation mode in which the electromagnetic wave is propagated a homogeneous medium cladding having a refractive index a n s ; and the core further comprising a side face parallel to the first direction, the side face in contact with the homogeneous medium cladding, the side face satisfying the condition: λ 0 /n s >a λ/(λ 2 /4 +a 2 ) 0.5 where λ 0 denotes a wavelength of the electromagnetic wave in a vacuum, a denotes a period of the photonic crystal, and λ denotes a period of the wave propagated through the core in the second direction perpendicular to the first direction.