Spectral shift response of optical whispering-gallery modes due to water vapor adsorption and desorption

Ma, Qiulin; Huang, Lei; Guo, Zhixiong; Rossmann, Tobias

doi:10.1088/0957-0233/21/11/115206

Cited by 43 publications

(38 citation statements)

References 17 publications

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“…One such method derives from the use of a coating on the resonator, which is modified upon absorption or adsorption of the desired gas [259]. For example, a humidity sensor based on a hydrophilic coating of SiO 2 nanoparticles has recently been reported [260], as too has ethanol vapor detection using a porous ZnO coating [261]. Polymers and sol-gels represent a more ubiquitous choice of coating, however, with sensing of water vapor [173,262], isopropanol [263], ammonia [264], ethanol [265,266], and hexane vapor [266] having been demonstrated.…”

Section: Sensingmentioning

confidence: 99%

Whispering gallery mode sensors

2015

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We present a comprehensive overview of sensor technology exploiting optical whispering gallery mode (WGM) resonances. After a short introduction we begin by detailing the fundamental principles and theory of WGMs in optical microcavities and the transduction mechanisms frequently employed for sensing purposes. Key recent theoretical contributions to the modeling and analysis of WGM systems are highlighted. Subsequently we review the state of the art of WGM sensors by outlining efforts made to date to improve current detection limits. Proposals in this vein are numerous and range, for example, from plasmonic enhancements and active cavities to hybrid optomechanical sensors, which are already working in the shot noise limited regime. In parallel to furthering WGM sensitivity, efforts to improve the time resolution are beginning to emerge. We therefore summarize the techniques being pursued in this vein. Ultimately WGM sensors aim for real-world applications, such as measurements of force and temperature, or alternatively gas and biosensing. Each such application is thus reviewed in turn, and important achievements are discussed. Finally, we adopt a more forward-looking perspective and discuss the outlook of WGM sensors within both a physical and biological context and consider how they may yet push the detection envelope further.

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Section: Sensingmentioning

confidence: 99%

Whispering gallery mode sensors

2015

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“…Optical microspheres are used extensively for temperature, humidity, and stress sensing. The working principle of microsphere resonators sensor is that the resonant wavelength or intensity of the output signal varies with the change in external environment .…”

Section: Structure and Application Of Wgmrsmentioning

confidence: 99%

Whispering Gallery Mode Optical Microresonators: Structures and Sensing Applications

Cai

Pan

Zhao

et al. 2020

Physica Status Solidi (a)

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Whispering gallery mode resonators (WGMRs) have achieved significant results due to their unique properties such as extremely small mode volume, ultra‐high quality (Q) factor, fast dynamic response, and ultra‐high sensitivity. WGM is commonly used in theoretical physics research, nonlinear optics, optoelectronic devices, and the preparation of high‐sensitivity sensors. This article briefly introduces the basic characteristics and sensing principle of WGM, the manufacturing method of WGMRs, and the sensing applications of microresonators in the fields of physics, chemistry, and biology. The detection limits of physical parameters and the detection sensitivity of biomolecules in recent decades are summarized. In addition, the advantages and disadvantages of different structures and the development trend of WGMRs applications are discussed.

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“…Due to the ultra-high Q factor of optical microresonator, the potential resolution for humidity measurement is better than other fiber optic humidity sensors. For example, for humidity sensing for a longperiod fiber-grating device coated with SiO2 nanoparticles it is estimated the minimum detectable humidity change if of the order of 1% RH whereas for a microsphere coated with same SiO2 nanoparticles in spherical microresonator the minimum detectable change is estimated be around 0.003%RH [13].…”

Section: Introductionmentioning

confidence: 99%

Compact relative humidity sensor based on an Agarose hydrogel coated silica microsphere resonator

Mallik¹,

Liu²,

Kavungal³

et al. 2017

SPIE Proceedings

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Northumbria University has developed Northumbria Research Link (NRL) to enable users to access the University's research output. Copyright © and moral rights for items on NRL are retained by the individual author(s) and/or other copyright owners. Single copies of full items can be reproduced, displayed or performed, and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided the authors, title and full bibliographic details are given, as well as a hyperlink and/or URL to the original metadata page. The content must not be changed in any way. Full items must not be sold commercially in any format or medium without formal permission of the copyright holder. The full policy is available online: http://nrl.northumbria.ac.uk/policies.html This document may differ from the final, published version of the research and has been made available online in accordance with publisher policies. To read and/or cite from the published version of the research, please visit the publisher's website (a subscription may be required.) Compact humidity sensor based on a multi-layer ABSTRACTIn this paper we report on a novel approach to implementing a compact humidity sensor that utilizes whispering gallery mode (WGM) phenomena in a silica microsphere coated with Agarose hydrogel. The spectral positions of the WGM resonances for such a sensor depend strongly on the refractive index and thickness of the coating. The WGM's spectral shift occurs due to adsorption/desorption of the water vapor in response to changes in ambient humidity and also due to the corresponding changes of the coating thickness. We experimentally investigated the WGMs spectral shift for a 100 µm diameter silica microsphere coated with Agarose hydrogel over a wide range of relative humidity (RH) values from 30%RH to 70%RH at a constant temperature. Six dip coating cycles of 2.25% wt. /vol. Agarose hydrogel were carried out in sequence with a characterization of the sensor performed for each coating thickness. A resonance shift of 16 nm is achieved in our experiment for the six-layer Agarose hydrogel coating sensor.

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Spectral shift response of optical whispering-gallery modes due to water vapor adsorption and desorption

Cited by 43 publications

References 17 publications

Whispering gallery mode sensors

Whispering gallery mode sensors

Whispering Gallery Mode Optical Microresonators: Structures and Sensing Applications

Compact relative humidity sensor based on an Agarose hydrogel coated silica microsphere resonator

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