Photonic crystal cavity based gas sensor

Photonic crystal cavity based gas sensor

We have studied the response of a photonic crystal cavity to changes of the ambient refractive index. Transmission measurements of the cavity under different gaseous environments and pressures showed a linear dependence of the resonance wavelength on the refractive index of the ambient gas. A change...

Full description

Saved in:
Bibliographic Details
Published in:Applied physics letters 2008-06, Vol.92 (26), p.261112-261112-3
Main Authors: Sünner, T, Stichel, T, Kwon, S.-H, Schlereth, T W, Höfling, S, Kamp, M, Forchel, A
Format: Article
Language:eng
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We have studied the response of a photonic crystal cavity to changes of the ambient refractive index. Transmission measurements of the cavity under different gaseous environments and pressures showed a linear dependence of the resonance wavelength on the refractive index of the ambient gas. A change of the refractive index by 10 − 4 leads to a shift of the resonance by 8 pm , which is readily detectable due to the high quality factor of the cavity. The observed wavelength shifts agree well with finite-difference time domain simulations of the cavity.
ISSN:0003-6951
1077-3118