Open AccessLiquid crystal based electrically switchable Bragg structure for THz waves
Author(s) -
R. Wilk,
Nico Vieweg,
Olaf Kopschinski,
Martín Koch
Publication year - 2009
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.007377
Subject(s) - optics , terahertz radiation , electric field , liquid crystal , materials science , bragg's law , optoelectronics , transfer matrix method (optics) , stopband , physics , diffraction , band pass filter , quantum mechanics
We demonstrate the first electronically switchable Bragg structure for THz frequencies. The structure works as stop-band filter and as mirror. It exhibits the 60 GHz broad stop-band around 300 GHz which can be removed by reorienting liquid crystal molecules in an external electric field. Our first proof-of-principle experiments agree very well with transfer matrix calculations.