Results 41 to 50 of about 89,156 (196)
Diffractive optics approach towards subwavelength pixels
, 2018 Pixel size in cameras and other refractive imaging devices is typically limited by the free-space diffraction. However, a vast majority of semiconductor-based detectors are based on materials with substantially high refractive index.
Fan, Bo +2 more
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Refractive Index Sensing by Using Mechanically Induced Long-Period Grating
IEEE Photonics Journal, 2012 In this paper, a refractive index sensor using a mechanically induced long-period grating is proposed and experimentally demonstrated. The sensing element is based on a composite optical waveguide, which is made of a single-mode fiber, a Teflon-cannula ...
Xiaojun Zhou +3 more
doaj +1 more source
The critical sensor: a new type of evanescent wave immunosensor [PDF]
, 1996 A new planar waveguide immunosensor has been developed in which adsorption at a surface, changing the refractive index contrast, is measured. In this ¿critical¿ sensor the change in the effective refractive index contrast is transducted to a shift of the
Borreman, A. +3 more
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Beilstein Journal of Nanotechnology, 2016 In this paper we report the design and experimental realisation of a novel refractive index sensor based on coupling between three nanoscale stripe waveguides. The sensor is highly compact and designed to operate at a single wavelength.
Chamanei Perera +5 more
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Nanofluidic Refractive-Index Sensors Formed by Nanocavity Resonators in Metals without Plasmons
Sensors, 2011 Nanocavity resonators in metals acting as nanofluidic refractive-index sensors were analyzed theoretically. With the illumination of transverse electric polarized light, the proposed refractive index sensor structure acts as a pure electromagnetic ...
Shih-Pin Tsai +3 more
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Graphene oxide-coated Long Period Grating-based fibre optic sensor for relative humidity and external refractive index [PDF]
, 2017 IEEE Graphene oxide is a very attractive material for refractive index and humidity sensing due to its unique two-dimensional structure, which results in faster response times and improved sensitivity over alternative materials.
Dissanayake, K. P. W. +4 more
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A Novel High Sensitivity Refractive Index Sensor Based on Multi-Core Micro/Nano Fiber
Photonic Sensors, 2019 A refractive index sensor based on a multi-core micro/nano fiber is proposed for low refractive index solutions. At first, the mode field distribution of the tapered multi-core fiber is analyzed with the finite element model (FEM).
Yuefeng Qi +5 more
doaj +1 more source
, 2012 We present a metamaterial-based terahertz (THz) sensor for thickness measurements of subwavelength-thin materials and refractometry of liquids and liquid mixtures.
Beigang, René +5 more
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Use of polyethylene glycol coatings for optical fibre humidity sensing [PDF]
, 2008 Humidity induced change in the refractive index and thickness of the polyethylene glycol (PEG) coatings are in situ investigated for a range from 10 to 95%, using an optical waveguide spectroscopic technique.
B. D. Gupta +31 more
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Refractive index sensor using microfiber-based Mach–Zehnder interferometer [PDF]
Optics Letters, 2011 A simple and robust refractive index (RI) sensor based on a Mach-Zehnder interferometer has been demonstrated. A section of optical microfiber drawn from silica fiber is employed as the sensing arm. Because of the evanescent field, a slight change of the ambient RI will lead to the variation of the microfiber propagation constant, which will further ...
Sun, Qizhen +6 more
openaire +3 more sources