A microfiber half coupler for refractive index sensing

Zhang, Qi; Lei, Jincheng; Cheng, Baokai; Yang, Song; Hua, Liwei; Xiao, Hai

doi:10.1109/lpt.2017.2735449

Cited by 11 publications

(9 citation statements)

References 25 publications

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“…As an example a tapered SMF coupler was fabricated by placing two traditional SMFs in parallel in physical contact and then heating and stretching the two SMFs with small diameters in the order of few micrometers [223][224][225]. The resulting tapered SMF coupler has been used for sensing applications, including temperature [226][227], RI [228][229][230], strain [231], liquid flow rate [232] and magnetic field sensing [233][234][235][236][237] etc. The functionalization of tapered SMF couplers enables the sensors to be used to detect bio-chemical materials, such as humidity [238][239], ammonia [240], ethanol [241], human cardiac troponin, in which the Vernier effect was utilized to improve sensor sensitivity [242], airborne contaminants [243], myocardial infarction I [244].…”

Section: B Tapered Sms Fiber Couplermentioning

confidence: 99%

Singlemode-Multimode-Singlemode Fiber Structures for Sensing Applications—A Review

Liu

et al. 2021

IEEE Sensors J.

118

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A singlemode-multimode-singlemode (SMS) fiber structure consists of a short section of multimode fiber fusionspliced between two SMS fibers. The mechanism underpinning the operation of an SMS fiber structure is multimode interference and associated self-imaging. SMS structures can be used in a variety of optical fiber systems but are most commonly used as sensors for a variety of parameters, ranging from macro-world measurands such as temperature, strain, vibration, flow rate, RI and humidity to the micro-world with measurands such as proteins, pathogens, DNA, and specific molecules. While traditional SMS structures employ a short section of standard multimode fiber, a large number of structures have been investigated and demonstrated over the last decade involving the replacement of the multimode fiber section with alternatives such as a hollow core fiber or a tapered fiber. The objective of replacing the multimode fiber has most often been to allow sensing of different measurands or to improve sensitivity. In this paper, several different categories of SMS fiber structures, including traditional SMS, modified SMS and tapered SMS fiber structures are discussed with some theoretical underpinning and reviews of a wide variety of sensing examples and recent advances. The paper then summarizes and compares the performances of a variety of sensors which have been published under a number of headings. The paper concludes by considering the challenges faced by SMS based sensing schemes in terms of their deployment in real world applications and discusses possible future developments of SMS fiber sensors.

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Section: B Tapered Sms Fiber Couplermentioning

confidence: 99%

Singlemode-Multimode-Singlemode Fiber Structures for Sensing Applications—A Review

Liu

et al. 2021

IEEE Sensors J.

118

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“…The RI sensing performances of MFC tip and MFC loop have further investigated. The MFC tip with a diameter of 2.1 μm exhibits a sensitivity of 6142.0 nm/RIU within the range of 1.39–1.40 [ 41 ], and the microfiber loop with a diameter of 4.5 μm facilitates a sensitivity of 3617 nm/RIU in the analyte RI range of 1.33–1.41 [ 29 ]. It is proved that the sensitivity versus external RI increases when the fiber diameter is getting smaller.…”

Section: Sensing Applicationsmentioning

confidence: 99%

“…After that, numerous physical, chemical, and biosensors based on MFC have been demonstrated. Refractive index (RI) [ 25 , 28 , 29 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ], force [ 50 ], twist [ 27 , 51 ], vibration [ 52 ], and strain [ 53 ] have direct effect on the signal transmission of MFC waist region. By covering and well packaging the waist region with functional materials, monitoring of temperature [ 23 , 24 , 28 , 31 , 32 , 37 , 42 , 43 , 46 , 54 , 55 , 56 , 57 , 58 , 59 , 60 ], humidity [ 31 , 57 , 61 , 62 , 63 , 64 , 65 , 66 ], magnetic field [ 30 , 67 , 68 ,…”

Section: Introductionmentioning

confidence: 99%

State-of-the-Art Optical Microfiber Coupler Sensors for Physical and Biochemical Sensing Applications

et al. 2020

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An optical fiber coupler is a simple and fundamental component for fiber optic technologies that works by reducing the fiber diameter to hundred nanometers or several micrometers. The microfiber coupler (MFC) has regained interest in optical fiber sensing in recent years. The subwavelength diameter rationales vast refractive index (RI) contrast between microfiber “core” and surrounding “cladding”, a large portion of energy transmits in the form of an evanescent wave over the fiber surface that determines the MFC ultrasensitive to local environmental changes. Consequently, MFC has the potential to develop as a sensor. With the merits of easy fabrication, low cost and compact size, numerous researches have been carried out on different microfiber coupler configurations for various sensing applications, such as refractive index (RI), temperature, humidity, magnetic field, gas, biomolecule, and so on. In this manuscript, the fabrication and operation principle of an MFC are elaborated and recent advances of MFC-based sensors for scientific and technological applications are comprehensively reviewed.

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“…Fiber-optic sensors have been widely demonstrated and applied for harsh environment applications. Compared with electronic sensors, fiber-optic sensors have the unique advantages of light weight, chemical resistance, high temperature resistance and distributed sensing capability [1][2][3][4][5]. Additionally, because of their immunity to electromagnetic interference (EMI), fiber optic sensors can be applied in strong EMI harsh environments [2][3][4][5][6][7][8][9].…”

mentioning

confidence: 99%

“…Compared with electronic sensors, fiber-optic sensors have the unique advantages of light weight, chemical resistance, high temperature resistance and distributed sensing capability [1][2][3][4][5]. Additionally, because of their immunity to electromagnetic interference (EMI), fiber optic sensors can be applied in strong EMI harsh environments [2][3][4][5][6][7][8][9]. Over the past years various optical fiber sensors have been proposed and demonstrated for temperature sensing, such as fiber interferometers, long period fiber gratings, fiber Bragg gratings and optical fiber directional couplers [6,[8][9][10][11].…”

mentioning

confidence: 99%

Information integrated glass module fabricated by integrated additive and subtractive manufacturing

et al. 2020

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In this letter, we report a novel integrated additive and subtractive manufacturing (IASM) method to fabricate information integrated glass module. After a certain number of glass layers are 3D printed and sintered by direct CO 2 laser irradiation, a microchannel will be fabricated on top of the printed glass by integrated picosecond laser, for intrinsic Fabry-Perot interferometer (IFPI) optical fiber sensor embedment. Then glass 3D printing process continues for the realization of bonding between optical fiber and printed glass. Temperature sensing up to 1000°C was demonstrated using the fabricated information integrated module. In addition, the long-term stability of the glass module at 1000°C was conducted. Enhanced sensor structure robustness and harsh temperature sensing capability makes this glass module attractive for harsh environment structural health monitoring.

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A microfiber half coupler for refractive index sensing

Cited by 11 publications

References 25 publications

Singlemode-Multimode-Singlemode Fiber Structures for Sensing Applications—A Review

Singlemode-Multimode-Singlemode Fiber Structures for Sensing Applications—A Review

State-of-the-Art Optical Microfiber Coupler Sensors for Physical and Biochemical Sensing Applications

Information integrated glass module fabricated by integrated additive and subtractive manufacturing

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