Sensitivity to alcohols of a planar waveguide ring resonator fabricated by a sol–gel method

Liu, Huanhuan; Han, Xiuyou; Chu, Fenghong; Geng, Jie; Cai, Haiwen; Qu, Ronghui; Fang, Zujie

doi:10.1016/j.snb.2006.03.031

Cited by 28 publications

(17 citation statements)

References 10 publications

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“…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. Due to the variation of chemical susceptibility between differing polymers, and hence the differing magnitudes of associated swelling and/or refractive index changes, chemical discrimination is possible in polymer-based gas sensors by use of multiplexed sensors [266].…”

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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“…These are typically high sensitivity devices, and include Mach-Zehnder interferometers [18], waveguides [19], microresonators [20], surface plasmon resonant sensors [21], and photonic crystal sensors [18,19]. The bulk of this microresonator sensor work is focused on liquid sensing, however, research into microresonator sensors for gaseous targets has been published [22][23][24][25][26][27][28][29][30]. Reviews of optical microresonator sensors have been published recently [31,32], so this paper will briefly outline recent microresonator sensor device results for context.…”

Section: Planar Microresonators and Microresonator Sensorsmentioning

confidence: 99%

Chip scale integrated microresonator sensing systems

Jokerst¹,

Royal

Palit

et al. 2009

Journal of Biophotonics

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Medicine, environmental monitoring, and security are application areas for miniaturized, portable sensing systems. The emerging integration of sensors with other components (electronic, photonic, fluidic) is moving sensing toward higher levels of portability through the realization of self-contained chip scale sensing systems. Planar optical sensors, and in particular, microresonator sensors, are attractive components for chip scale integrated sensing systems because they are small, have high sensitivity, can be surface customized, and can be integrated singly or in arrays in a planar format with other components using conventional semiconductor fabrication technologies. This paper will focus on the progress and prospects for the integration of microresonator sensors at the chip scale with photonic input/output components and with sample preparation microfluidics, toward self-contained, portable sensing systems.

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“…The interaction between the circulating light and the outside medium is amplified many times as the light circulates inside the resonator. As a result, optical resonators have been used for various sensing applications [1][2][3][4][5] including chemical detection [2,[5][6][7][8][9][10]. The microresonator based chemical sensors have the general advantages of high measurement resolution and small size.…”

Section: Introductionmentioning

confidence: 99%

Integrated chemical vapor sensor based on thin wall capillary coupled porous glass microsphere optical resonator

Wang

Yuan

Kim

et al. 2015

Sensors and Actuators B: Chemical

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a b s t r a c tA miniaturized chemical vapor sensor probe was developed using a porous glass microsphere (PGM) as the alignment-free optical microresonator. The porous microsphere was placed inside a thin wall silica capillary tube that was fusion-spliced to an optical fiber. The whispering gallery modes (WGMs) of the microsphere were excited by the evanescent field of the light propagating inside the capillary thin wall. Adsorption of chemical vapor molecules into the pores led to a refractive index change of the PGM and thus the resonance wavelength shift of the WGMs. To facilitate the in-taking of chemical vapor molecules into the PGM, a micro window was opened at the backend of the capillary tube using femtosecond laser micromachining. Ethanol vapor was used to demonstrate the probe for chemical vapor sensing. With a miniaturized size, integrated structure and reflection mode of operation, the proposed probe may find useful in many practical applications such as environmental monitoring and biomedical sensing.

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Sensitivity to alcohols of a planar waveguide ring resonator fabricated by a sol–gel method

Cited by 28 publications

References 10 publications

Whispering gallery mode sensors

Whispering gallery mode sensors

Chip scale integrated microresonator sensing systems

Integrated chemical vapor sensor based on thin wall capillary coupled porous glass microsphere optical resonator

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