Results 31 to 40 of about 858,458 (356)

Enhancing sensitivity in absorption spectroscopy using a scattering cavity [PDF]

arXiv, 2021
Absorption spectroscopy is widely used to detect samples with spectral specificity. Here, we propose and demonstrate a method for enhancing the sensitivity of absorption spectroscopy. Exploiting multiple light scattering generated by a boron nitride (h-BN) scattering cavity, the optical path lengths of light inside a diffusive reflective cavity are ...
arxiv  

Germanium-based integrated photonics from near- to mid-infrared applications

Nanophotonics, 2018
Germanium (Ge) has played a key role in silicon photonics as an enabling material for datacom applications. Indeed, the unique properties of Ge have been leveraged to develop high performance integrated photodectors, which are now mature devices.
Marris-Morini Delphine, Vakarin Vladyslav, Ramirez Joan Manel, Liu Qiankun, Ballabio Andrea, Frigerio Jacopo, Montesinos Miguel, Alonso-Ramos Carlos, Le Roux Xavier, Serna Samuel, Benedikovic Daniel, Chrastina Daniel, Vivien Laurent, Isella Giovanni   +13 more
doaj   +1 more source

Thermometric absorption spectroscopy through active locking of microbubble resonators

Frontiers in Physics, 2023
We implemented a Microbubble Resonator (MBRs) as an opto-thermal transducer to reconstruct the absorption spectrum of a nanoparticle suspension through its temperature increase.
Gabriele Frigenti, Daniele Farnesi, Guglielmo Vesco, Guglielmo Vesco, Sonia Centi, Fulvio Ratto, Stefano Pelli, Tatyana V. Murzina, Gualtiero Nunzi Conti, Silvia Soria   +9 more
doaj   +1 more source

Improving the accuracy of the NDIR-based CO 2 sensor for breath analysis [PDF]

Metrology and Measurement Systems, 2021
The paper presents an analysis and practical study of the temperature and pressure influence on a nondispersive infrared (NDIR) sensor for measuring the concentration of carbon dioxide in human breath.
Artur Prokopiuk, Zbigniew Bielecki, Jacek Wojtas   +2 more
doaj   +1 more source

TWO DIFFERENT TYPES OF PHOTOCHEMISTRY IN PHYCOERYTHROCYANIN α-SUBUNIT [PDF]

, 1993
The photochemical activities of phycoerythrocyanin α-subunits from Mastigocladus laminosus separated by isoelectric focusing were tested by irradiating at 500, 550, 577 and 600 nm.
Bjorn L. O., Braslavsky S. E., Braune W., Bryant D. A., Falk H., Fiiglistaller P., Gantt E., Kufer W., MacColl R., Maruthi Sai P. S., Scheer H., Siebzehnrubl S., Zhao K.-H.   +12 more
core   +1 more source

Reproduction of Visible Absorbance Spectra of Highly Scattering Suspensions within an Integrating Sphere by Monte Carlo Simulation

Photonics, 2023
It is important to avoid the overestimation of absorption due to scattering when using absorption spectroscopy to measure scattering samples. We approached this issue by placing the sample inside an integrating sphere (IS) to collect the scattered light ...
Ayaka Mori, Kyohei Yamashita, Eiji Tokunaga   +2 more
doaj   +1 more source

Optical frequency comb Fourier transform cavity ring-down spectroscopy [PDF]

arXiv, 2022
We demonstrate broadband and sensitive cavity ring-down spectroscopy using a near infrared frequency comb and a time-resolved Fourier transform spectrometer. The cavity decays are measured simultaneously and spectrally sorted, leading to purely exponential decays for each spectral element.
arxiv  

MHz Unidirectional Rotation of Molecular Rotary Motors [PDF]

, 2008
A combination of cryogenic UV-vis and CD spectroscopy and transient absorption spectroscopy at ambient temperature is used to study a new class of unidirectional rotary molecular motors.
Agranat I., Balzani V., Boyer P. D., Browne W. R., Devanathan S, Feringa B. L., Fischer E., Fletcher S. P., Koumura N., Leigh D. A., Macanita A. L., Meier H., Pollard M. M., Schuddeboom W., Ter Wiel M. K. J., Vale R. D., Vicario J., von Salis G. A., Waldeck D. H., Walker J. E., Zijlstra R. W. J.   +20 more
core   +1 more source

An Artificial Neural Network to Eliminate the Detrimental Spectral Shift on Mid-Infrared Gas Spectroscopy

Sensors, 2023
We demonstrate the successful implementation of an artificial neural network (ANN) to eliminate detrimental spectral shifts imposed in the measurement of laser absorption spectrometers (LASs).
Sanghoon Chin, Jérôme Van Zaen, Séverine Denis, Enric Muntané, Stephan Schröder, Hans Martin, Laurent Balet, Steve Lecomte   +7 more
doaj   +1 more source

Resolving nonuniform temperature distributions with single-beam absorption spectroscopy. Part II: Implementation from broadband spectra [PDF]

Journal of Quantitative Spectroscopy and Radiative Transfer, 2021, 2020
Several past studies have described how absorption spectroscopy can be used to determine spatial temperature variations along the optical path by measuring the unique, nonlinear response to temperature of many molecular absorption transitions and performing an inversion. New laser absorption spectroscopy techniques are well-suited to this nonuniformity
arxiv   +1 more source