抄録
A directivity of radiation from a localized source placed in photonic crystals is investigated theoretically using a two-dimensional model. The closed form expression for the far field of radiation is derived and used to examine two primary factors governing the directivity. It is shown that the directivity is uniquely characterized by the transmission windows of the photonic crystals in the frequency and angular spectral domains and the Fabry-Perot resonance condition for the space surrounding the source.
