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Concept

Refractometer

Publications associées (14)

Fiber-interface directional coupler inscribed by femtosecond laser for refractive index measurements

Jiangtao Zhou, Zhechen Zhang, Zhe Zhang

A novel fiber-interface directional waveguide coupler was inscribed on the surface of a coreless fiber by femtosecond laser, and was successfully applied to highly sensitive refractive index (RI) measurements. The primary arm was first inscribed to couple ...

2020

Recent Advances in Resonant Waveguide Gratings

Olivier Martin, Benjamin Gallinet, Giorgio Quaranta

Resonant waveguide gratings (RWGs), also known as guided mode resonant (GMR) gratings or waveguide-mode resonant gratings, are dielectric structures where these resonant diffractive elements benefit from lateral leaky guided modes from UV to microwave freq ...

2018

Self-Similar Multiresonant Nanoantenna Arrays for Sensing from Near- to Mid-Infrared

Hatice Altug, Andreas Tittl, Aurélian Michel John-Herpin, Daniel Rodrigo Lopez

Tailoring nanoscale light concentration and electromagnetic near-field enhancement over a broad spectral range is crucial for many photonics applications such as infrared spectroscopy, photodetection, and light harvesting. So far, broadband light enhanceme ...

2018

Discrimination of temperature and strain by combined refractive index and birefringence measurements using coherent Rayleigh sensing

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Xin Lu

Temperature and strain discrimination is experimentally demonstrated in an elliptical-core polarization-maintaining fiber by making use of Rayleigh-based distributed birefringence measurements and the frequency shift of the correlation peak obtained by sta ...

SPIE2017

Light Scattering Enhancement at the Absorption Edge in Dewetting Droplets of Cyanine Dyes

Frank Nüesch, Jakob Heier, Florent Alexandre Boudoire

Diffraction properties of thin films of dewetted cyanine dye droplets are investigated and related to the complex refractive index. Strong changes in the index of refraction are often found near the absorption edge of organic dyes. Within a small window of ...

Wiley-V C H Verlag Gmbh2017

Volume refractometry of liquids using stable optofluidic Fabry-Perot resonator with curved surfaces

This work reports a simple, miniaturized optical sensing module for liquid refractometry. It is based on a stable Fabry-Perot resonator consisting of two silicon cylindrical mirrors with a cylindrical lens in the core. The lens is formed by a capillary tub ...

Spie-Int Soc Optical Engineering2015

New diagnostics for density measurement on Frascati Tokamak upgrade

Fabio Avino

In FTU, density profile is measured with two new diagnostics: a CO2/CO scanning interferometer and a time-of-flight radar (denominated refractometer). The first, using two scanning beams, can provide a plasma density profile every 62.5 mu s. Two lasers (CO ...

Elsevier Science Bv2013

Refractive index sensor based on slot waveguide cavity

Hans Peter Herzig, Armando Cosentino, Qing Tan

The experimental study of a gold slot waveguide cavity is presented. The resonance of this cavity working in the telecom wavelength range is highly dependent on the refractive index of the medium located in or around the slots array, because of the high co ...

European Optical Soc2012

Photosensitivity and stress changes of Ge-free Bi-Al doped silica optical fibers under ArF excimer laser irradiation

Hans Georg Limberger

The photosensitivity of germanium free Bi-Al-doped silica fibers with different bismuth concentrations was investigated using ArF excimer laser radiation at 193 nm and fiber grating formation. For the fiber with the highest bismuth concentration maximum re ...

Optical Society of America2011

Complex-coupled photonic crystal THz lasers with independent loss and refractive index modulation

Romuald Houdré, Hua Zhang

Compared to near infra-red photonic crystal (PhC) band-edge lasers, achieving vertical emission with quantum cascade (QC) material operating in the THz range needs dedicated engineering because the TM polarized emission of QCLs favors in-plane emitting sch ...

2011

Mid-infrared surface plasmon resonance sensing applied to refractive index measurements of liquids

There has been a very strong development of the sensors based on surface plasmon resonance during the last thirty years, mostly for biological and biomedical applications. If the first experiments in this field were carried out at the beginning of the 20t ...

EPFL2010

Simultaneous cell morphometry and refractive index measurement with dual- wavelength digital holographic microscopy and dye-enhanced dispersion of perfusion medium

Pierre Magistretti, Pierre Marquet, Christian Depeursinge, Benjamin Rappaz, Florian Charrière

Digital holographic microscopy (DHM) allows optical-path-difference (OPD) measurements with nanometric accuracy. OPD induced by transparent cells depends on both the refractive index (RI) of cells and their morphology. This Letter presents a dual-wavelengt ...

2008

Ultra-thick micro-optical components using the PRISM photosensitive flexopolymer

Martinus Adela Maria Gijs, Virendra Kumar Parashar, Abdeljalil Sayah, Venkataragavalu Sivagnanam

We present the photosensitive flexopolymer PRISM as a new promising material for the realization of thick optical components. The PRISM flexopolymer can be directly polymerized using conventional UV exposure and is simply developed in a water-based solutio ...

2007

Living specimen tomography by digital holographic microscopy: morphometry of testate amoeba

Pierre Marquet, Christian Depeursinge, Tristan Colomb, Nicolas Pavillon, Benjamin Rappaz, Florian Charrière

This paper presents an optical diffraction tomography technique based on digital holographic microscopy. Quantitative 2-dimensional phase images are acquired for regularly-spaced angular positions of the specimen covering a total angle of π, allowing to bu ...

2006