Optically responsive dry cholesteric liquid crystal marbles

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Going beyond 1000000 resolved points in a Brillouin distributed fiber sensor: theoretical analysis and experimental demonstration

Luc Thévenaz, Marcelo Alfonso Soto Hernandez, Andrey Denisov

Distributed fiber sensing possesses the unique ability to measure the distributed profile of an environmental quantity along many tens of kilometers with spatial resolutions in the meter or even centimeter scale. This feature enables distributed sensors to ...

Chinese Acad Sciences, Changchun Inst Optics Fine Mechanics And Physics2016

Crystal Phase Engineering in III-V Semiconductor Films: from Epitaxy to Devices

Philipp Staudinger

Crystal phase engineering is an exciting pathway to enhance the properties of conventional semiconductors. Metastable SiGe presents a direct band gap well suited for optical devices whereas wurtzite (WZ) phosphide alloys enable efficient light emission in ...

EPFL2020

Interplay between the potential waveform and diffusion layer dynamics determines the time-response of voltammetric detection in microchannels

Martinus Adela Maria Gijs, Raphaël Etienne Jean Trouillon

The diffusion layer is a critical factor affecting the temporal response of electrochemical devices. In this article, we have investigated the effect of the relaxation of the diffusion layer during the potentiodynamic sensing of ferrocenemethanol (FcMeOH) ...

Elsevier2015

Instability of a thin viscous film flowing under an inclined substrate: the emergence and stability of rivulets

François Gallaire, Gioele Mariano Nicolò Balestra, Pier Giuseppe Ledda, Gaëtan Pierre Clément Lerisson

We study the pattern formation of a thin film flowing under an inclined planar substrate. The phenomenon is studied in the context of the Rayleigh-Taylor instability using the lubrication equation. Inspired by experimental observations, we numerically stud ...

Cambridge University Press2020

Optical Injection and Lasing Dynamics in Long-Wavelength VCSELs With Intracavity Patterning

Elyahou Kapon, Benjamin Dwir, Alexandru Mereuta, Alexei Sirbu, Vladimir Iakovlev, Andrei Caliman, Zlatko Mickovic, Dalila Ellafi, Christopher Michael Long

We present the static and optical injection response of wafer-fused long-wavelength VCSELs with and without intracavity patterning. It is found that the extra optical cavity patterning increases the gain anisotropy between orthogonal polarization modes, in ...

Ieee-Inst Electrical Electronics Engineers Inc2015

Spectrally Selective Mid-Wave Infrared Detection Using Fabry-Perot Cavity Enhanced Black Phosphorus 2D Photodiodes

Christophe Ballif, Quentin Thomas Jeangros, Wei Yan

Thin two-dimensional (2D) material absorbers have the potential to reduce volume-dependent thermal noise in infrared detectors. However, any reduction in noise must be balanced against lower absorption from the thin layer, which necessitates advanced optic ...

AMER CHEMICAL SOC2020

Optical process and optical device, allowing to avoid unwanted nonlinear effects in an optical fiber

Luc Thévenaz, Marcelo Alfonso Soto Hernandez

The invention concerns a process comprising the following steps: injecting, in an optical fiber, N time limited replica optical signals at distinct frequencies, each replica signal being temporally shifted relative to the other replica signals; then propag ...

2015

On the effect of linear feedback and parametric pumping on a resonator's frequency stability

Zohreh Mohammadi, Luis Guillermo Villanueva Torrijo

Resonant sensors based on micro- and nano-electro mechanical systems (M/NEMS) are ubiquitous in many sensing applications due to their outstanding performance capabilities, which are directly proportional to the quality factor (Q) of the devices. We addres ...

2020

Extended Gate Field Effect Transistor Based Sensor for Detection of Trace Amounts of Anti-Depressant Drug

Mihai Adrian Ionescu, Shokoofeh Sheibani

Citalopram hydrobromide (CP) is a selective serotonin reuptake inhibitor for the treatment of the depressive disorder. In this work, a novel label-free recognition method based on an extended gate field-effect transistor (EGFET) for selective determination ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2020

Modes interplay controls the second harmonic generation dynamics of plasmonic nanostructures

Olivier Martin, Andrei Kiselev, Gabriel David Bernasconi

A large amount of experimental and theoretical works deals with the second harmonic generation from different plasmonic geometries. Since they often consider relatively long optical pulses, many of these studies are focused on the investigation of a quasi- ...

SPIE2020

Hardware Architecture and Cutting-Edge Assembly Process of a Tiny Curved Compound Eye

Dario Floreano, Ramon Pericet Camara, Géraud L'Eplattenier

The demand for bendable sensors increases constantly in the challenging field of soft and micro-scale robotics. We present here, in more detail, the flexible, functional, insect-inspired curved artificial compound eye (CurvACE) that was previously introduc ...

Mdpi Ag2014