High-performance humidity sensor based on a polyvinyl alcohol-coated photonic crystal cavity

Chenyang Zhao; Qingchen Yuan; Liang Fang; Xuetao Gan; Jianlin Zhao

doi:10.1364/OL.41.005515

High-performance humidity sensor based on a polyvinyl alcohol-coated photonic crystal cavity

Chenyang Zhao, Qingchen Yuan, Liang Fang, Xuetao Gan, Jianlin Zhao

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

We demonstrate a high-performance relative humidity (RH) sensor by coating a photonic crystal (PC) cavity with polyvinyl alcohol (PVA). Because a PC cavity's evanescent field strongly interacts with the coated moisture-sensitive PVA film, the resonant wavelength is modified remarkably under varying RH levels ranging from 30% to 90%. In a PC cavity coated with a 720 nm thick PVA, the sensor exhibits a linear spectrum sensitivity exceeding 129 pm/%RH over 40-90% RH, and the power interrogation presents a high sensitivity as 0.77 dB/%RH. The resolvable humidity variation could be much less than 0.1%RH. Relying on the sub-micron thick PVA, the sensor promises a response time less than 300 ms and good repeatability. The dependence of the sensor performances on the PVA thickness is studied as well, indicating a tradeoff between the sensing dynamic range and the response time.

Original language	English
Pages (from-to)	5515-5518
Number of pages	4
Journal	Optics Letters
Volume	41
Issue number	23
DOIs	https://doi.org/10.1364/OL.41.005515
State	Published - 1 Dec 2016

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title = "High-performance humidity sensor based on a polyvinyl alcohol-coated photonic crystal cavity",

abstract = "We demonstrate a high-performance relative humidity (RH) sensor by coating a photonic crystal (PC) cavity with polyvinyl alcohol (PVA). Because a PC cavity's evanescent field strongly interacts with the coated moisture-sensitive PVA film, the resonant wavelength is modified remarkably under varying RH levels ranging from 30\% to 90\%. In a PC cavity coated with a 720 nm thick PVA, the sensor exhibits a linear spectrum sensitivity exceeding 129 pm/\%RH over 40-90\% RH, and the power interrogation presents a high sensitivity as 0.77 dB/\%RH. The resolvable humidity variation could be much less than 0.1\%RH. Relying on the sub-micron thick PVA, the sensor promises a response time less than 300 ms and good repeatability. The dependence of the sensor performances on the PVA thickness is studied as well, indicating a tradeoff between the sensing dynamic range and the response time.",

author = "Chenyang Zhao and Qingchen Yuan and Liang Fang and Xuetao Gan and Jianlin Zhao",

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T1 - High-performance humidity sensor based on a polyvinyl alcohol-coated photonic crystal cavity

AU - Zhao, Chenyang

AU - Yuan, Qingchen

AU - Fang, Liang

AU - Gan, Xuetao

AU - Zhao, Jianlin

PY - 2016/12/1

Y1 - 2016/12/1

N2 - We demonstrate a high-performance relative humidity (RH) sensor by coating a photonic crystal (PC) cavity with polyvinyl alcohol (PVA). Because a PC cavity's evanescent field strongly interacts with the coated moisture-sensitive PVA film, the resonant wavelength is modified remarkably under varying RH levels ranging from 30% to 90%. In a PC cavity coated with a 720 nm thick PVA, the sensor exhibits a linear spectrum sensitivity exceeding 129 pm/%RH over 40-90% RH, and the power interrogation presents a high sensitivity as 0.77 dB/%RH. The resolvable humidity variation could be much less than 0.1%RH. Relying on the sub-micron thick PVA, the sensor promises a response time less than 300 ms and good repeatability. The dependence of the sensor performances on the PVA thickness is studied as well, indicating a tradeoff between the sensing dynamic range and the response time.

AB - We demonstrate a high-performance relative humidity (RH) sensor by coating a photonic crystal (PC) cavity with polyvinyl alcohol (PVA). Because a PC cavity's evanescent field strongly interacts with the coated moisture-sensitive PVA film, the resonant wavelength is modified remarkably under varying RH levels ranging from 30% to 90%. In a PC cavity coated with a 720 nm thick PVA, the sensor exhibits a linear spectrum sensitivity exceeding 129 pm/%RH over 40-90% RH, and the power interrogation presents a high sensitivity as 0.77 dB/%RH. The resolvable humidity variation could be much less than 0.1%RH. Relying on the sub-micron thick PVA, the sensor promises a response time less than 300 ms and good repeatability. The dependence of the sensor performances on the PVA thickness is studied as well, indicating a tradeoff between the sensing dynamic range and the response time.

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High-performance humidity sensor based on a polyvinyl alcohol-coated photonic crystal cavity

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