Pressure-tunable guided-mode resonance sensor for single-wavelength characterization.
A method of tuning a one-dimensional guided-mode resonance grating through the use of an air-pressure-responsive membrane is demonstrated here using finite-element method simulation. The device consists of a titanium dioxide (TiO(2)) grating structure embedded in a flexible polydimethylsiloxane membrane. This grating has a resonant response to TM-polarized light at a wavelength dependent upon the refractive index of the surrounding medium. By varying the pressure by 5500 Pa, lateral strain may be applied to the grating; this allows resonances to be produced for medium refractive indices ranging from 1.33 to 1.50 for a fixed-wavelength 850 nm light source.
Department of Electrical Engineering, University of Texas at Dallas, Richardson, Texas 75080, USA. sjf041000@utdallas.edu
Steven
S
Foland
Kyung-Hak
KH
Choi
Jeong-Bong
JB
Lee