Open AccessThe effect of structural disorder on guided resonances in photonic crystal slabs studied with terahertz time-domain spectroscopy
Author(s) -
Tushar Prasad,
Vicki Colvin,
Daniel M. Mittleman
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.016954
Subject(s) - fano resonance , photonic crystal , terahertz radiation , optics , spectroscopy , materials science , transmission coefficient , terahertz spectroscopy and technology , guided mode resonance , hexagonal lattice , spectral line , lattice (music) , condensed matter physics , molecular physics , optoelectronics , physics , transmission (telecommunications) , diffraction grating , plasmon , grating , quantum mechanics , antiferromagnetism , astronomy , electrical engineering , engineering , acoustics
We measure the normal-incidence transmission coefficient of photonic crystal slabs with hexagonal arrays of air holes in silicon. The transmission spectra exhibit sharp resonant features with Fano line shapes. They are produced due to the coupling of the leaky photonic crystal modes, called guided resonances, to the continuum of free-space modes. We investigate the effects of several types of structural disorder on the spectra of these resonances. Our results indicate that guided resonances are very tolerant to disorder in the hole diameter and to interface roughness, but very sensitive to disorder in the lattice periodicity.