Chemical sensing in slotted photonic crystal heterostructure cavities

被引：251

作者：

Di Falco, A. ^{[1
]}

O'Faolain, L. ^{[1
]}

Krauss, T. F. ^{[1
]}

机构：

[1] Univ St Andrews, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland

来源：

APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 06期

基金：

英国工程与自然科学研究理事会;

关键词：

chemical sensors; photonic crystals; refractive index; voids (solid); SENSOR;

D O I：

10.1063/1.3079671

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We fabricated slotted photonic crystal waveguides and cavities supporting resonant modes in air. Their peculiar geometry enables the detection of refractive index changes in a given analyte with high sensitivity because of the large overlap between the optical mode and the analyte. This yields a high figure of merit for the sensitivity of the device and we are able to report values of S=Delta lambda/Delta n over 1500. By applying a photonic crystal heterostructure to the slotted geometry, we are able to create high quality-factor cavities essential for realizing low detection limits up to Q=50 000.

引用

页数：3

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