Open AccessTerahertz parametric generation photonic band gap structure with negligible structural dispersion in the optical range
Author(s) -
Yu-Chuan Chen,
Mark CroninGolomb,
Lei Zhang,
Jing Zhao,
James J. Foshee
Publication year - 2006
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.14.001933
Subject(s) - photonic crystal , terahertz radiation , materials science , optics , optoelectronics , refractive index , dispersion (optics) , terahertz spectroscopy and technology , physics
We present a photonic band gap (PBG) structure (or nonlinear photonic crystal) design for terahertz (THz) wave parametric generation, whose component materials have a small refractive index difference in the near infrared and a large index difference for THz waves. The structural dispersion of such a PBG structure is strong in the THz range but negligible in the optical range. The former allows the phase-matched pump wavelength to be placed in the near infrared to eliminate two-photon absorption of the pump and signal beams. The latter leads to a crystal layer fabrication tolerances of a few micrometers and traditional polishing methods are suitable for device fabrication. The added design flexibility also allows the use of the most efficient crystal orientations.