Photonic Barcodes Based on a SNAP Microcavity for Displacement Sensing

Zeng, Xueliang; Dong, Yongchao; Li, Yongkang; Wang, Jiebo; Sun, Peng; Wang, Han

doi:10.1109/jsen.2022.3194625

Cited by 4 publications

(1 citation statement)

References 46 publications

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“…The current research focus has shifted to miniaturized gas sensors with multiple independent outputs to recognize different gases. , These sensors can be developed based on a subset of sensing materials that are already applied to single-output sensors (e.g., catalytic-combustion, electrochemical, chemiresistive, and optical/photonic − ) owing to their diverse vapor responses. Of all these, solid-state optical gas sensors stand out for their unique advantages such as cost competitiveness, low energy requirement, compactness, and molecular-level sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Detection of Volatile Organic Compounds through Spectroscopic Signatures in Nanoporous Fabry–Pérot Optical Microcavities

Tran,

Lim

et al. 2024

ACS Appl. Mater. Interfaces

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Increasingly complex modern gas-monitoring scenarios necessitate advanced sensing capabilities to detect and identify a diverse range of gases under varying conditions. There is a rising demand for individual sensors with multiple responses capable of recognizing gases, identifying components in mixtures, and providing stable responses. Inspired by gas sensors employing multivariable response principles, we develop a nanoporous anodic alumina high-order microcavity (NAA-HOμCV) gas sensor with multiple optical outputs for discriminative gas detection. The NAA-HOμCV architecture, formed by a Fabry−Peŕot microcavity with distributed Bragg reflector (DBR) mirrors and an extendedlength microcavity layer supporting multiple resonant modes, serves as an effective solid-state fingerprint platform for distinguishing volatile organic compound (VOC) gases. Our research reveals that the coupling strength of light into resonant modes and their evolution depend on the thickness of the DBR mirrors and the dimension of the microcavity layer, which allows us to optimize the discriminative sensing capability of the NAA-HOμCV sensor through structural engineering of the microcavity and photonic crystal mirrors. Gas-sensing experiments conducted on the NAA-HOμCV sensor demonstrate real-time discrimination between physiosorbed VOC gases (isopropanol, ethanol, or acetone) in reversible gas sensing. It also achieves superior ppb-level sensing in irreversible gas sensing of model silane molecules. Our study presents promising avenues for designing compact, cost-effective, and highly efficient gas sensors with tailored properties for discriminative gas detection.

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