scholarly journals Excitation of Multi-Beam Interference and Whispering-Gallery Mode in Silica Taper-Assisted Polymer Microspheres for Refractometric Sensing

Photonics ◽  
2021 ◽  
Vol 8 (4) ◽  
pp. 117
Author(s):  
Huibo Fan ◽  
Dawei Zhou ◽  
Li Fan ◽  
Yuanyan Wu ◽  
Hao Tao ◽  
...  
Keyword(s):  
Transmission Spectrum ◽  
Large Angle ◽  
High Sensitivity ◽  
Fiber Optic Sensor ◽  
Whispering Gallery Modes ◽  
Polymer Microspheres ◽  
Whispering Gallery ◽  
Optic Sensor ◽  
Angle Scattering ◽  
Spectrum Shift

We propose and numerically analyze a fiber-optic sensor based on a silica taper-assisted multiple polymer microspheres to realize high-sensitivity refractometric sensing due to the excitation of multi-beam interference and whispering-gallery modes (WGMs) in each microsphere. Up to 5 UV-cured adhesive microspheres are dripped in sequence on the 2 µm-diameter silica taper with the certain distances in between. Scattering and reflection of light in each microsphere enhance the multi-beam interference because of the emergence of high-order modes. Moreover, WGMs with certain resonant wavelengths are excited in the microspheres, further enhancing the transmission spectrum with high contrast and quality factor. Furthermore, irregular transmission spectrum corresponds to the large wavelength tuning range. Propagating light between the microspheres could be strongly affected by the environmental factor with the large transmission spectrum shift, therefore realizing the refractometric sensing with high sensitivity of 846 nm/RIU based on the taper-assisted 2-spheres sensor. Furthermore, another two microspheres are placed on both sides of 2-spheres sensor to form 4-spheres-loop sensor, re-collecting those large-angle scattering light with the enhancement of multi-beam interference and WGMs. Therefore, the sensitivity of 4-shperes-loop sensor is further improved to the maximum of 1296.3 nm/RIU.

High Sensitivity Humidity Fiber-Optic Sensor Based on All-Agar Fabry–Perot Interferometer

2018 ◽  
Vol 18 (12) ◽  
pp. 4879-4885 ◽  
Author(s):  
Bo Wang ◽  
Jiajun Tian ◽  
Ling Hu ◽  
Yong Yao
Keyword(s):  
Fiber Optic ◽  
High Sensitivity ◽  
Fiber Optic Sensor ◽  
Optic Sensor ◽  
Fabry Perot

Advanced Plasmonic Fiber-Optic Sensor for High Sensitivity Measurement of Magnetic Field

2019 ◽  
Vol 19 (17) ◽  
pp. 7355-7364 ◽  
Author(s):  
Eva Rodriguez-Schwendtner ◽  
Maria-Cruz Navarrete ◽  
Natalia Diaz-Herrera ◽  
Agustin Gonzalez-Cano ◽  
Oscar Esteban
Keyword(s):  
Magnetic Field ◽  
Fiber Optic ◽  
High Sensitivity ◽  
Fiber Optic Sensor ◽  
Sensitivity Measurement ◽  
Optic Sensor

scholarly journals Temperature Fiber-Optic Sensor with ZnO ALD Coating

2021 ◽  
Vol 2 (1) ◽  
pp. 99
Author(s):  
Paulina Listewnik
Keyword(s):  
Fiber Optic ◽  
Atomic Layer ◽  
Peak Position ◽  
Fiber Optic Sensor ◽  
Measured Parameter ◽  
Optic Sensor ◽  
Layer Deposition ◽  
Spectrum Shift ◽  
Linear Fit ◽  
Reflected Signal

This study presents a microsphere-based fiber-optic sensor with a ZnO Atomic Layer Deposition (ALD) coating thickness of 100 nm for temperature measurements. Metrological properties of the sensor were investigated over the temperature range of 100 °C to 300 °C, with a 10 °C step. An interferometric signal is used to control whether the microstructure is whole. Spectrum shift of a reflected signal is used to ascertain changes in the measured parameter. With changing temperature, the peak position of a reflected signal also changes. The R2 coefficient of the presented sensor indicates a good linear fit of over 0.99 to the obtained data. The sensitivity of the sensor investigated in this study equals 0.019 nm/°C.

scholarly journals Analysis and application of whispering gallery modes of the triple-layer-coated microsphere resonator

2018 ◽  
Vol 189 ◽  
pp. 01009 ◽  
Author(s):  
Mengyu Wang ◽  
Xueying Jin ◽  
Fei Li ◽  
Keyi Wang
Keyword(s):  
Single Layer ◽  
High Sensitivity ◽  
High Refractive Index ◽  
Whispering Gallery Modes ◽  
Narrow Linewidth ◽  
Whispering Gallery ◽  
Triple Layer ◽  
Em Field ◽  
Sensing Application ◽  
Difference Time

Microsphere resonators supporting whispering gallery modes (WGMs) have been extensively applied for considerable fields including narrow linewidth filters, high-sensitivity sensors, and nonlinear optics. We numerically demonstrate a coated microsphere resonator with three layers of high, low, high refractive-index (RI) from inside to outside. A phase matched waveguide is used to overlap the WGMs evanescent radiation field. Eigen-mode, relative intensity spectra, electromagnetic (EM) field distributions are observed to analyze resonant characteristics of WGMs by using the finite difference time domain method. As a result, two brilliant rings with strong EM fields distribute in two high-RI layers. By optimizing the gap distance between the microsphere and waveguide, the WGMs of two high-RI layer are efficiently excited. More energy is stored in such a structure rather than a single-layer-coated microsphere. Our approach provides the RI sensing application with such a triple-layer-coated structure.

High-Sensitivity Fiber-Optic Sensor for Hydrogen Detection in Gas and Transformer Oil

2019 ◽  
Vol 19 (9) ◽  
pp. 3348-3357 ◽  
Author(s):  
Maximilian Fisser ◽  
Rodney A. Badcock ◽  
Paul D. Teal ◽  
Arvid Hunze
Keyword(s):  
Fiber Optic ◽  
High Sensitivity ◽  
Transformer Oil ◽  
Fiber Optic Sensor ◽  
Hydrogen Detection ◽  
Optic Sensor

scholarly journals MEMS-Based Reflective Intensity-Modulated Fiber-Optic Sensor for Pressure Measurements

Sensors ◽  
2020 ◽  
Vol 20 (8) ◽  
pp. 2233 ◽  
Author(s):  
Ning Zhou ◽  
Pinggang Jia ◽  
Jia Liu ◽  
Qianyu Ren ◽  
Guowen An ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Room Temperature ◽  
Microelectromechanical Systems ◽  
Fiber Optic ◽  
High Sensitivity ◽  
Fiber Optic Sensor ◽  
Pressure Measurements ◽  
Integrated Sensor ◽  
Intensity Modulated ◽  
Optic Sensor

A reflective intensity-modulated fiber-optic sensor based on microelectromechanical systems (MEMS) for pressure measurements is proposed and experimentally demonstrated. The sensor consists of two multimode optical fibers with a spherical end, a quartz tube with dual holes, a silicon sensitive diaphragm, and a high borosilicate glass substrate (HBGS). The integrated sensor has a high sensitivity due to the MEMS technique and the spherical end of the fiber. The results show that the sensor achieves a pressure sensitivity of approximately 0.139 mV/kPa. The temperature coefficient of the proposed sensor is about 0.87 mV/°C over the range of 20 °C to 150 °C. Furthermore, due to the intensity mechanism, the sensor has a relatively simple demodulation system and can respond to high-frequency pressure in real time. The dynamic response of the sensor was verified in a 1 kHz sinusoidal pressure environment at room temperature.

Sign in / Sign up

Export Citation Format

Share Document