Ultrasensitive Gas-Phase Chemical Sensing Based on Functionalized Photonic Crystal Nanobeam Cavities

被引：70

作者：

Chen, Yu ^{[1
]}

Fegadolli, William S. ^{[2
]}

Jones, William M. ^{[2
]}

Scherer, Axel ^{[2
,3
]}

Li, Mo ^{[1
]}

机构：

[1] Univ Minnesota, Dept Elect & Comp Engn, Minneapolis, MN 55455 USA

[2] CALTECH, Dept Phys, Pasadena, CA 91125 USA

[3] CALTECH, Dept Elect Engn, Pasadena, CA 91125 USA

来源：

ACS NANO | 2014年 / 8卷 / 01期

基金：

美国国家科学基金会;

关键词：

photonic crystal cavity; chemical sensor; thermo-optical bistability; RESONATOR;

D O I：

10.1021/nn4050547

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Photonic crystal nanobeam cavities with high-quality factors are very sensitive to the changes of the dielectric properties of their surroundings. Utilizing this high sensitivity and by applying chemical functionalization, an ultrasensitive chemical sensor for gases based on a nanobeam cavity was demonstrated. A limit of detection of 1.5 parts-per-billion (ppb) in ambient conditions, determined from the noise level of the system, was achieved for nerve agent simulant methyl salicylate. The nanobeam cavity's nonlinear thermo-optical bistability is also utilized to realize a threshold detector for cumulative chemical exposure.

引用

页码：522 / 527

页数：6

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