Results 151 to 160 of about 89,156 (196)

Echelon grating refractive index sensor

Optics Letters
There are few reports on optical refractive index sensors that have both high resonant-wavelength resolution (RWR) and high refractive index sensitivity (RIS). Herein, based on an echelon grating, we design a refractive index sensor that combines the two advantages together. The principal fringe of echelon grating has a small full width at half maximum
Haotian Zhang, Xiaoping Li, Yue Pan, Hongzhong Cao, Yunjie Xia, Rende Ma   +5 more
openaire   +2 more sources

An optofluidic refractive index sensor based on partial refraction

Sensors and Actuators B: Chemical, 2010
Abstract This article reports on an optofluidic refractive index sensor based on partial refraction. The sample to be measured is injected into a cladding sensing microchannel. The refraction angle and the optical reflectivity change with the variation of the refractive index of the cladding liquid.
Seow, Y.C., Lim, S.P., Khoo, B.C., Lee, H.P.   +3 more
openaire   +1 more source

Multipoint Fibre Optic Refractive Index Sensors

SPIE Proceedings, 1986
We propose a multisensor network where the refractive index modulators are distributed in cascade along the optical fibre. Reflections at fibre glass-monitoring medium interfaces provide a train of time multiplexed pulses. Backscattered radiation in the fibre serves as a reference channel for the individual sensors which can be designed for temperature,
Andre Tardy, Michel Jurczyszyn
openaire   +1 more source

Refractive index sensor for sensing high refractive index bioliquids at the THz frequency

Journal of the Optical Society of America B, 2021
In 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
openaire   +1 more source

Fiber optic liquid refractive index sensor

AIP Conference Proceedings, 2015
In 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, Rahul Kumar Gangwar, Vinod Kumar Singh   +2 more
openaire   +1 more source

Temperature-insensitive hybrid interferometric liquid refractive index sensor

Review of Scientific Instruments, 2021
A 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, Fengjuan Wei, Tianzong Xu, Qian Ma, Min Li, Zhaochun Zhang   +5 more
openaire   +2 more sources

A Nonlinear Microresonator Refractive Index Sensor

Journal of Lightwave Technology, 2015
We 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
openaire   +1 more source

Surface plasmon-polariton Mach-Zehnder refractive index sensor

Journal of the Optical Society of America B, 2008
We 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, Andrey V. Kabashin, Raman Kashyap   +2 more
openaire   +2 more sources

Highly sensitive refractive index sensors

SPIE Proceedings, 2007
A 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 ...
openaire   +1 more source

Refractive index sensor based on surface-plasmon interference

Optics Letters, 2009
We 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, Jiasen, Zhang, Jianjun, Chen, Chenglong, Zhao, Qihuang, Gong   +4 more
openaire   +2 more sources