Defect-mode-like transmission and localization of light in photonic crystals without defects

Date
2010-10-29
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Source Title
Physical Review B - Condensed Matter and Materials Physics
Print ISSN
1098-0121
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Publisher
The American Physical Society
Volume
82
Issue
16
Pages
165131-1 - 165131-7
Language
English
Type
Article
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Abstract

It is shown that far- and near-field effects, which are similar to those arising in transmission through finite-thickness photonic crystals (PCs) with structural defects, can be obtained in the conventional defect-free dielectric square-lattice PCs. Multiple narrow peaks of total transmission can appear within a frequency range, where the noncircular isofrequency dispersion contours of one type are quickly transformed for a higher-order Floquet-Bloch wave to the noncircular contours of the other type, leading to a frequency-domain passband being very narrow within a certain range of variation of the angles of incidence. In this regime, the mirror reflectance of the equivalent Fabry-Pérot resonator takes rather large values, which correspond to large values of Q factor and group index of refraction, strong field localization, and good isolation of the transmission peaks from each other. In some examples presented, Q factor exceeds 104. © 2010 The American Physical Society.

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