Guided-mode-leaky-mode-guided-mode fiber structure and its application to high refractive index sensing

Yang, Li; Xue, L.; Che, Di; Qian, Jingren

doi:10.1364/ol.37.000587

Cited by 35 publications

(19 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The refractive index of E7 (n=1.546) was higher than that of the MMF core (n core =1.462). Thus a guided-mode-leakymode-guided-mode (GLG) fiber structure was formed [9]. It is well known that the effective index of a leaky mode is a complex number whose real parts represent modal phase info in propagation, and imaginary ones represent modal attenuation due to the leakage.…”

Section: Experimental Setup and Principle Of Operationmentioning

confidence: 99%

“…So far, most SMS sensors is based on the surrounding RI lower than that of the multimode fiber core, measuring the wavelength shift to detect temperature or displacement. For the case that the surrounding RI is higher than that of the multimode fiber core [9], a new concept of leaky mode interference is presented. In that leaky structure, the variation of the output intensity with the surrounding RI is monotonic, providing the basis of RI sensing by intensity detection.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Use of bending of a single SMS fiber structure for measurement of temperature sensing

et al. 2012

Self Cite

View full text Add to dashboard Cite

A simple temperature sensor based on a bent singlemode-multimode-singlemode (SMS) fiber structure fastened on a polymer base plate is proposed and experimentally investigated. The surrounding refractive index (RI) is higher than that of the silica fiber and RI changes with temperature will not lead to wavelength shift. This SMS fiber structure utilizes changing of temperature to control the curvature of SMS fiber which is induced by expanding of polymer base plate. The shifts of central wavelength are measured at temperature range from 59 to 82 ºC. The proposed temperature sensor offers sensitivity of 3.9 nm/°C, which is significantly higher than that of a normal straight SMS structure or a grating-based fiber structure. Keywords: Singlemode-multimode-singlemode fiber, fiber-optic sensor, displacement, temperature INTRODUCTIONOptical fiber sensors have many advantages such as immunity to electromagnetic interference, small size, the possibility of remote operation and high sensitivity. Recently, a number of optical fiber temperature sensors have been developed, such as fiber Bragg gratings (FBGs) [1, 2], long-period fiber gratings (LPFGs) [3], Fabry-Perot interferometer [4] and singlemode-multimode-singlemode (SMS) fiber structure [5]. FBGs for temperature sensing exhibit sensitivity of 0.01nm/°C and that for LPFGs is 0.1 nm/°C. A SMS fiber structure can also be used for temperature sensing (10pm/°C) and is much easier to fabricate than a grating-based fiber since it only involves cleaving and splicing processes that can be carried out in any fiber-optics laboratory, therefore a sensor based on a SMS fiber structure will be more economic than that based on a grating fiber. As a SMS sensor is sensitive to both strain (displacement) and temperature [6][7][8], it should also be possible to use a SMS fiber sensor for simultaneous measurement of displacement and temperature. However, the temperature sensitivity of such devices is always very low, as all fibers are made of silica with low thermo-optic and thermal expansion coefficients. In order to enhance the device temperature sensitivity, it is necessary to modify the materials and components in fiber sensor. Qiang Wu et al. [7] shows that a bent SMS fiber structure used as a temperature sensor has a much higher temperature sensitivity of 32 pm/°C.The underlying principle of SMS fiber sensor is multimode interference excited between modes in the multimode fiber (MMF) section, which can be influenced by external perturbation. So far, most SMS sensors is based on the surrounding RI lower than that of the multimode fiber core, measuring the wavelength shift to detect temperature or displacement. For the case that the surrounding RI is higher than that of the multimode fiber core [9], a new concept of leaky mode interference is presented. In that leaky structure, the variation of the output intensity with the surrounding RI is monotonic, providing the basis of RI sensing by intensity detection. It means that when RI is changing with temperature, we can measure the inten...

show abstract

Section: Experimental Setup and Principle Of Operationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Use of bending of a single SMS fiber structure for measurement of temperature sensing

et al. 2012

Self Cite

View full text Add to dashboard Cite

show abstract

“…[11][12][13] In addition to these biological applications, guided-mode resonance methods can also be used to measure the refractive index of solutions. [14][15][16] The guided-mode resonance filter (GMRF) can be used as a detector carrier. When the surface of the GMRF is covered with different materials, the resonant condition depends on the refractive index of the material.…”

Section: Introductionmentioning

confidence: 99%

Portable organic gas detection sensor based on the effect of guided-mode resonance

et al. 2017

View full text Add to dashboard Cite

A novel organic gas detection sensor based on the effect of guided-mode resonance is proposed in this paper. The sensor is designed to operate in the visible light band. It contains four main sections: a light source, a miniature gas chamber composed of a guided-mode resonant filter, a diffraction grating, and a CCD image sensor. When bunched visible light is irradiated vertically to the gas chamber, it passes through the gas chamber and diffraction grating, and is then received by the CCD sensor. The optical signal received by the CCD sensor is then reduced to the spectrum using a specific algorithm. When organic gases are injected into the gas chamber, there is a shift in the wavelength of resonant reflection, and the magnitude of this shift is proportional to the refractive index of the gas. The large variation in the refractive indexes of industrially important organic gases means that their characteristic peak wavelengths can be easily identified. As a result, this system can quickly detect organic gases. To verify the feasibility of this technique, we use finite difference time domain solutions to simulate the results. The sensitivity of this type of sensor can reach wavelength differences of 0.001 nm, which means that the sensor has high potential for application in portable, high-precision detection systems.

show abstract

“…The window of the pass band filter in the transmission spectrum can be adjusted to locate in the C communication band or other communication bands with different length of the NCF based on the SMF-NCF-SMF (SNS) structure [2,12]. The sensors based on SNS, which mainly took advantage of the effective refractive index of the core mode to be influenced by surroundings, were studied widely by predecessors [13][14][15][16]. It was reported that the geometry parameters of the special MMF were key factors for the different sensing structures.…”

Section: Introductionmentioning

confidence: 99%

Highly sensitive bending sensor based on multimode–multimode–coreoffset fiber structure

Sun

et al. 2015

Optics & Laser Technology

View full text Add to dashboard Cite

Guided-mode-leaky-mode-guided-mode fiber structure and its application to high refractive index sensing

Cited by 35 publications

References 10 publications

Use of bending of a single SMS fiber structure for measurement of temperature sensing

Use of bending of a single SMS fiber structure for measurement of temperature sensing

Portable organic gas detection sensor based on the effect of guided-mode resonance

Highly sensitive bending sensor based on multimode–multimode–coreoffset fiber structure

Contact Info

Product

Resources

About