METALLIC DIELECTRIC PHOTONIC CRYSTALS AND METHODS OF FABRICATION

摘要

A metallic-dielectric photonic crystal is formed with a periodic structure defining a plurality of resonant cavities to selectively absorb incident radiation. A metal layer is deposited on the inner surfaces of the resonant cavities and a dielectric material fills inside the resonant cavities. This photonic crystal can be used to selectively absorb broadband solar radiation and then reemit absorbed radiation in a wavelength band that matches the absorption band of a photovoltaic cell. The photonic crystal can be fabricated by patterning a sacrificial layer with a plurality of holes, into which is deposited a supporting material. Removing the rest of the sacrificial layer creates a supporting structure, on which a layer of metal is deposited to define resonant cavities. A dielectric material then fills the cavities to form the photonic crystal.

主权项

1. A photonic crystal for absorbing incident radiation, comprising:
a periodic structure defining a plurality of resonant cavities, the periodic structure having a period less than a predetermined cut-off wavelength; a layer of metal disposed on an inner surface of at least one resonant cavity in the plurality of resonant cavities, the at least one resonant cavity supporting at least one optical mode; and a dielectric material, deposited within the at least one resonant cavity, having a dielectric constant selected such that the at least one optical mode has a wavelength substantially equal to the predetermined cut-off wavelength.