Patent ID: 7919216
Filing Date: 2011-04-05
Classification: B82Y,G02B,G03F

Abstract:
1. A mask comprising a light-shielding area for shielding light and a light passing area to allow the light to pass therethrough, the light-shielding area having a plurality of photonic crystals with a lattice constant, and a ratio of the lattice constant to a wavelength of the light being a specific value within a band gap of the photonic crystal, wherein the photonic crystal includes a plurality of photonic crystal cells, each of which has a rectangular- or hexagonal-shaped surface receiving the light and includes a first dielectric and a second dielectric, the first dielectric includes four cuboids forming a frame surrounding the second dielectric when the surface is rectangular-shaped, and the first dielectric includes two cylinders when the surface is hexagonal-shaped.