High-sensitivity humidity sensing of side-polished optical fiber with polymer nanostructure cladding

Tang, Li; Feng, Yan; Xing, Zengshan; Chen, Zhe; Yu, Jianhui; Guan, Heyuan; Lu, Huihui; Fang, Junbin; Zhong, Yi

doi:10.1364/ao.57.002539

Cited by 13 publications

(10 citation statements)

References 28 publications

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“…However, the resonant wavelength shift was approximately linear in response to RH variations between 75% and 90%, and a sensitivity of ~10.15 nm/RH% could be obtained through linear fitting (with goodness of 0.961). This is nearly 10 times larger than the maximum sensitivity reported previously [ 26 ].…”

Section: Resultsmentioning

confidence: 56%

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Highly Sensitive Surface Plasmon Resonance Humidity Sensor Based on a Polyvinyl-Alcohol-Coated Polymer Optical Fiber

Wang

Shao

et al. 2021

Biosensors

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A surface-plasmon-resonance-based fiber device is proposed for highly sensitive relative humidity (RH) sensing and human breath monitoring. The device is fabricated by using a polyvinyl alcohol (PVA) film and gold coating on the flat surface of a side-polished polymer optical fiber. The thickness and refractive index of the PVA coating are sensitive to environmental humidity, and thus the resonant wavelength of the proposed device exhibits a redshift as the RH increases. Experimental results demonstrate an average sensitivity of 4.98 nm/RH% across an ambient RH ranging from 40% to 90%. In particular, the sensor exhibits a linear response between 75% and 90% RH, with a sensitivity of 10.15 nm/RH%. The device is suitable for human breath tests and shows an average wavelength shift of up to 228.20 nm, which is 10 times larger than that of a silica-fiber-based humidity sensor. The corresponding response and recovery times are determined to be 0.44 s and 0.86 s, respectively. The proposed sensor has significant potential for a variety of practical applications, such as intensive care and human health analysis.

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Section: Resultsmentioning

confidence: 56%

“…The sensitivity reached 0.3 nm/RH% for the RH ranging from 30% to 90% [ 25 ]. Tang et al proposed a highly sensitive humidity sensor consisting of side-polished fibers coated with polymer nanostructures [ 26 ]. This design achieved a humidity sensitivity of up to 1.12 nm/RH%, which is the highest sensitivity reported to date.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Surface Plasmon Resonance Humidity Sensor Based on a Polyvinyl-Alcohol-Coated Polymer Optical Fiber

Wang

Shao

et al. 2021

Biosensors

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“…Gelatin is a natural polymer material that can slowly swell to 5‐10 times of its initial volume. Owing to its simple acquisition, strong water absorption and good linearity, it has been widely concerned in recent years 10,19,20 . Considering the availability of this materials and its simple synthesis, gelatin is a good choice for humidity sensing.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…Tapered or polished humidity sensor by coating sensitive films on the surface of evanescent field has shown high sensitivity, low hysteresis, acceptable repeatability and fast response and recovery time 9‐15 . Nevertheless, these sensors are susceptible to the fluctuations of light source and fiber loss 8 .…”

Section: Introductionmentioning

confidence: 99%

High sensitivity relative humidity sensor based on SMTF structure coated with gelatin

Guo

Jia

Tang

et al. 2020

Micro & Optical Tech Letters

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A high sensitivity relative humidity sensor based on single mode tapered fiber (SMTF) structure coated with gelatin is reported. The sensing element is composed of a 12‐μm‐diameter fiber taper coated with a thickness of 26‐mm‐length gelatin layer, and is operated at a wavelength of 1550 nm. The sensor is designed based on the intermodal interference effect with high sensitivity (511.33 nW/%RH) and linear response for high RH (72‐90%RH) at 25°C. In this study, we analyzed the factors affecting sensor sensitivity and proposed the method to improve the sensitivity of the sensor. The sensor responses obviously. When the RH increased to more than 70%, the optical power boosts almost 10 000 times, which has promising potential applications as an optical switch in industrial production, food processing, and environmental early warning.

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“…Titanium (Ti) has excellent characteristics, such as high corrosion resistance, and high-adhesion layer and passivation surface, which are enough properties to construct an SPR-sensor [9,10]. There are several techniques to achieve nanomaterials-based optical sensors, such as the deposition of a thin film on a fiber core, microfiber, and side-polished optical fiber [11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Surface Plasmon Resonance (SPR) in MoS2- and WS2-Protected Titanium Side-Polished Optical Fiber as a Humidity Sensor

et al. 2019

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In this paper, we report the effects of a side-polished fiber (SPF) coated with titanium (Ti) films in different thicknesses, namely 5 nm, 13 nm, and 36 nm, protected by a thin layer of transition metal dichalcogenides (TMDCs) such as molybdenum disulfide (MoS2) and tungsten disulfide (WS2), which provide ultra-sensitive sensor-based surface plasmon resonance (SPR) covering from the visible to mid-infrared region. The SPF deposited with Ti exhibits strong evanescent field interaction with the MoS2 and WS2, and good optical absorption, hence resulting in high-sensitivity performance. Incremental increases in the thickness of the Ti layer contribute to the enhancement of the intensity of transmission with redshift and broad spectra. The findings show that the optimum thickness of Ti with 36 nm combined with MoS2 causes weak redshifts of the longitudinal localized surface plasmon resonance (LSPR) mode, while the same thickness of Ti with WS2 causes large blueshifts. The redshifts are possibly due to a reduced plasmon-coupling effect with the excitonic region of MoS2. The observed blueshifts of the LSPR peak position are possibly due to surface modification between WS2 and Ti. Changing the relative humidity from 58% to 88% only elicited a response in Ti/MoS2. Thus, MoS2 shows more sensitivity on 36-nm thickness of Ti compared with WS2. Therefore, the proposed fiber-optic sensor with integration of 2D materials is capable of measuring humidity in any environment.

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High-sensitivity humidity sensing of side-polished optical fiber with polymer nanostructure cladding

Cited by 13 publications

References 28 publications

Highly Sensitive Surface Plasmon Resonance Humidity Sensor Based on a Polyvinyl-Alcohol-Coated Polymer Optical Fiber

Highly Sensitive Surface Plasmon Resonance Humidity Sensor Based on a Polyvinyl-Alcohol-Coated Polymer Optical Fiber

High sensitivity relative humidity sensor based on SMTF structure coated with gelatin

Investigation of Surface Plasmon Resonance (SPR) in MoS2- and WS2-Protected Titanium Side-Polished Optical Fiber as a Humidity Sensor

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