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Refractive index sensor for sensing high refractive index bioliquids at the THz frequency
Journal of the Optical Society of America B, 2021In this paper, a highly sensitive and low loss refractive index (RI) biosensor for high RI bio-analytes detection, such as for cholesterol, nicotine, and bacillus bacteria, is proposed. A novel, to the best of our knowledge, decagonal structure with porous core photonic crystal fiber (PC-PCF) is introduced.
Amit Kumar, Pankaj Verma, Poonam Jindal
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Fiber optic liquid refractive index sensor
AIP Conference Proceedings, 2015In this present work we report fabrication of fiber optic liquid refractive index (RI) measurement sensor based on Michelson Interferometer method. This sensor was assembled by using graded index multimode (MM) fiber with core diameter 50 µm and the cladding of fiber was removed by simple chemical method. To perform this experiment a 2×2 3dB coupler is
Vanita Bhardwaj +2 more
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Temperature-insensitive hybrid interferometric liquid refractive index sensor
Review of Scientific Instruments, 2021A temperature-insensitive all fiber Fabry–Pérot (F–P) and Mach–Zehnder (M–Z) hybrid compact structure and its sensing characteristics are proposed and theoretically and experimentally demonstrated. In one sensor, two kinds of sensing principles are existing, which is shown in the sensing process that with the increase in the refractive index (RI) of ...
Lijun Li +5 more
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A Nonlinear Microresonator Refractive Index Sensor
Journal of Lightwave Technology, 2015We propose an ultrasensitive refractive index (RI) sensor based on the nonlinear index of refraction in a microring resonator coupled to waveguides in an add-drop configuration. The nonreciprocity caused by the difference between the nonlinear self-phase and cross-phase modulation leads to a bifurcation of the optical intensities for two ...
Chao Wang, Christopher P. Search
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Surface plasmon-polariton Mach-Zehnder refractive index sensor
Journal of the Optical Society of America B, 2008We present what we believe is a novel theoretical scheme for phase interrogation of a planar refractive index sensor based on a surface plasmon polariton (SPP) excited with a Bragg grating. The device is a Mach-Zehnder interferometer (MZI), which offers a simple integrated optical solution to monitor relative phase variations in waveguides.
Galina Nemova +2 more
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Highly sensitive refractive index sensors
SPIE Proceedings, 2007A chemical and biological sensor based on a free-space waveguide resonant grating optical filter has been developed. Different from the conventional surface plasmon resonance sensors and the conventional waveguide mode sensors, which require either prism coupling or grating coupling, the proposed free-space optical sensor device does not require ...
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Refractive index sensor based on surface-plasmon interference
Optics Letters, 2009We propose a refractive index sensor based on the interference of two surface-plasmon waves on both surfaces of a gold film with a two-slit structure. The phase of the interference was solved, and the dispersion relation of the real part of Au dielectric function was considered.
Xiaofei, Wu +4 more
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In-fiber interferometry sensors for refractive index
Applied Physics Reviews, 2023Compact interferometers based on waveguiding structures have found countless applications in refractive index measurements, chemical sensing, as well as temperature and pressure measurements. The most common fiber devices are based on Mach–Zehnder interferometry and Michelson interferometry—two design concepts that can readily be implemented using ...
Deniz Aydin +2 more
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Refractive index measurements by fiber Bragg grating sensor
Proceedings of IEEE Sensors 2003 (IEEE Cat. No.03CH37498), 2004The numerical and experimental analysis on the use of thinned fiber Bragg gratings as refractive index sensors have been carried out. Wet chemical etching in a buffered hydrofluoric acid (HF) solution was used for sensor fabrication. Experimental characterization for an 8.5/spl mu/m etched cladding sensor is presented demonstrating resolutions of /spl ...
IADICICCO, Agostino +5 more
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Fiber Laser-Based Refractive Index Sensor
Optical Fiber Sensors, 2006A fiber laser-based refractive index sensor is presented. The refractive index was measured by monitoring the delay time of the lasing from the pump excitation time. High refractive index sensitivity of 10-6 can be obtained.
Xiufeng Yang +3 more
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