All-Dielectric Surface-Enhanced Infrared Absorption-Based Gas Sensor Using Guided Resonance

Yuhua Chang; Dihan Hasan; Bowei Dong; Jingxuan Wei; Yiming Ma; Guangya Zhou; Kah Wee Ang; Chengkuo Lee

doi:10.1021/acsami.8b16623

All-Dielectric Surface-Enhanced Infrared Absorption-Based Gas Sensor Using Guided Resonance

ACS Appl Mater Interfaces. 2018 Nov 7;10(44):38272-38279. doi: 10.1021/acsami.8b16623. Epub 2018 Oct 29.

Authors

Yuhua Chang^{1

2}, Dihan Hasan^{1

2}, Bowei Dong^{1

2}, Jingxuan Wei^{1

2}, Yiming Ma^{1

2}, Guangya Zhou³, Kah Wee Ang¹, Chengkuo Lee^{1

2}

Affiliations

¹ Department of Electrical and Computer Engineering , National University of Singapore , 117583 , Singapore.
² Center for Intelligent Sensors and MEMS , National University of Singapore , 117608 , Singapore.
³ Department of Mechanical Engineering , National University of Singapore , 117575 , Singapore.

PMID: 30360088
DOI: 10.1021/acsami.8b16623

Abstract

The surface-enhanced infrared absorption (SEIRA) technique has been focusing on the metallic resonator structures for decades, exploring different approaches to enhance sensitivity. Although the high enhancement is achieved, the dissipative loss and strong heating are the intrinsic drawbacks of metals. Recently, the dielectric platform has emerged as a promising alternative. In this work, we report a guided resonance-based all-dielectric photonic crystal slab as the platform for SEIRA. The guided resonance-induced enhancement in the effective path length and electric field, together with gas enrichment polymer coating, leads to a detection limit of 20 ppm in carbon dioxide (CO₂) sensing. This work explores the feasibility to apply low loss all-dielectric structures as a surface enhancement method in the transmission mode.

Keywords: all-dielectric; gas enrichment polymer; gas sensor; guided resonance; photonic crystal slab; surface enhanced infrared absorption.