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Publications associées (28)

Photovoltaic creation of charged domain walls in barium titanate

The optical control of domain structures in ferroelectrics is of great interest. In the present work, we demonstrate the reliable creation of charged domain walls - conductive channels in otherwise insulating barium titanate - by a combined effect of light and electric field. We propose a scenario for the documented process, in which the bulk photovoltaic effect plays the key role, providing charge screening at the walls. Our scenario is supported by the results of phase-field simulations. The results are o

Nature Research2026

Hybrid integrated tunable lasers based on thin-film lithium niobate and tantalate

Smart-cut ferroelectric thin films such as thin-film lithium niobate (TFLN) are revolutionizing integrated photonics, overcoming the limitations of traditional photonic integrated circuit platforms such as bulk lithium niobate and silicon(nitride)-on-insulator. They enable linear and high-speed modulators operating at CMOS voltage levels to be used in applications including data-centre communications and high-performance computing. TFLT is an analogion of TFLN that combines the excellent electro-optical mod

SPIE2026

Floquet topological state induced by light-driven band inversion in SnTe

High-intensity coherent light can realize hybrid phases of matter that are not accessible in equilibrium. The coherent interaction between Bloch states and a periodic electric field, which leads to Floquet-engineered band structures, has been extensively discussed in the literature and shown to enable modified electronic states, and it potentially induces topological phases in semiconductors. However, a Floquet topological insulator has not yet been realized experimentally in a semiconductor. Here we show t

Springer Science and Business Media LLC2026

Multilayer Light Processor for AI Compute and Networking

This paper investigates optical processors for AI, addressing interconnect bottlenecks and optical data processing. We introduce a Multilayer Light Processor, a programmable 3D free-space optical architecture for neural processing and optical circuit switching.

IEEE2025

Fine Detection of Process State and Secondary Process Emissions in Laser Powder-bed Fusion (lpbf) by Dual Acoustic Sensor Acquisition and Machine Learning

Jamasp Jhabvala

Powder Bed Fusion - Laser Based/Metal (PBF-LB/M), respective Laser powderbed fusion (LPBF) has become a key additive manufacturing method, driving the need for robust monitoring techniques to ensure process stability and reproducibility. In -situ monitoring methods are broadly categorized into optical and acoustic approaches, each with distinct advantages. Acoustic methods, unlike optical ones, can capture emissions from within the substrate and are often more cost-effective. Most PBF-LB/M monitoring system

IOP Publishing Ltd2025

Nanoimprint stamp fabrication by combination of T-SPL and dry etching

Fabricating high-resolution grayscale patterns at the nanoscale remains a significant challenge, particularly on fused silica substrates. These grayscale patterns find extensive applications in optical devices such as optical gratings, diffraction optics, and transparent electronics in the semiconductor industry. Although thermal scanning probe lithography (T-SPL) enables high-resolution grayscale patterning on polyphthalaldehyde (PPA), it is a slow process and necessitates also transfer to a stable substra

2023

Hydraulic performance evaluation of a micro-turbine with counter rotating runners by experimental investigation and numerical simulation

François Avellan, Elena Vagnoni, Loïc Andolfatto, Cécile Münch-Alligné

The development of energy recovery systems on existing water utility networks is a new challenge for increasing the sustainability of electricity generation mix. The concept of the new micro-turbine with counter rotating runners braces this goal by allowin ...

Pergamon-Elsevier Science Ltd2018

Characterization of the bottom turbid layer in a pit lake and its response to convective cooling

Base Mine Lake (BML) is a pit lake used to store the Fluid Fine Tailings (FFT) generated by the oil sands industry, in the Athabasca region (northern Alberta, Canada). It is well studied to try understanding its evolution over time and to determine if an effective separation of the FFT from the cap water will eventually be reached. The mixing mechanisms taking place in the lake and affecting the suspended solids are of particular interest. Turbidity increases at the bottom of the water column suggesting the

2017

Analyzing Volleyball Match Data from the 2014 World Championships Using Machine Learning Techniques

Pascal Fua

This paper proposes a relational learning based approach for discovering strategies in volleyball matches based on optical tracking data. In contrast to most existing methods, our approach permits discovering patterns that account for both spatial (that is, partial configurations of the players on the court) and temporal , that is, the order of events and positions, aspects of the game. We analyze both the men’s and women’s final match from the 2014 FIVB Volleyball World Championships, and are able to ident

2016

Bosonic lasing and trapping of a dressed photon fluid in InGaN at room temperature

Munise Nevin Cobet

The generation of a quantum fluid of dressed photons at room temperature is experimentally demonstrated in an InGaN microcavity which is divided into two-and one-dimensional sections, resulting in single- and switchable multilevel coherent light emission. ...

Amer Physical Soc2016

Optical response from terahertz to visible light of electronuclear transitions in LiYF4:Ho3+

Because of its role as a model system with tunable quantum fluctuations and quenched disorder, and the desire for optical control and readout of its states, we have used high-resolution optical absorption spectroscopy to measure the crystal-field excitations for Ho3+ ions in LiHoxY1-xF4 from the terahertz to visible regimes. We show that many of the excitations yield very narrow lines visibly split even by the nuclear hyperfine interaction, making Ho3+ in LiHoxY1-xF4 a candidate host for optically addressab

American Physical Society2016

Coherent creation and destruction of orbital wavepackets in Si:P with electrical and optical read-out

The ability to control dynamics of quantum states by optical interference, and subsequent electrical read-out, is crucial for solid state quantum technologies. Ramsey interference has been successfully observed for spins in silicon and nitrogen vacancy cen ...

Nature Publishing Group2015

A robotic platform for lower limb optical motion tracking in open space

Hannes Bleuler, Mohamed Bouri

Characterization of gait is largely used for research on locomotion or for clinical improvement and follow up. There exists two main technologies for measurement of the kinematics of walking: IMU systems and optical tracking. Inertial measurement units are getting more and more popular because of their integrability, cost and lack of spatial limitations. Despite these advantages, optical motion tracking solutions offer a higher precision which is for various applications such as kinetics analysis. In that s

2014

A new strategy for improving fluorescent immunoassays using photonic crystals

The most widely used substrates for fluorescent immunoassay are based on transparent materials such as glass or plastic with almost no optical functionality. Very recently, optical nanostructures made of metal on dielectrics have been proposed to perform photon management features mediated by surface or localized plasmons. In particular, resonant ring-shaped antennas have been demonstrated to enhance the amount of overall fluorescence radiated from few emitters and provide some control on the emission direc

2014

Gravity Gradient Earth Sensor experiment on REXUS 11

This experiment is the first test of the concept for a novel attitude determination sensor in freefall, that utilizes the Earth

s gravity gradient as a reference. Current sensors require multiple optical heads with access on all faces of a satellite that might point towards the Earth [1]. Earth sensors determine the Earth vector by sensing the position of the Earth’s horizon, detecting the Earth

s IR emission against the background of space [2]. The gravity-gradient based approach does not require optical a

2013

Control of the cross-polar reflection coefficients of reflectarray cells using truncated patches

A technique for controlling the magnitude and phase of the co-to-cross reflection coefficients in microstrip reflectarrays cells is presented. It is based on truncating different patch corners, and thus can be efficiently applied to patches with sizes close to the array lattice. The main application of this technique is a novel synthesis method for reflectarrays with quasi-null cross-polarization, which requires the control of the four terms of the cells scattering matrix. However similar strategies could a

2013

Can Multi-Channel FID Navigators Quantify Head Motion?

This work investigates the ability of free induction decay (FID) navigators to provide information on rigid head motion. FID navigators were incorporated in a gradient-echo sequence. In parallel, optical tracking data was acquired and served as the ground truth. Three subjects were scanned at 3T with a 32-channel head coil while performing complex head movements. A linear model was trained with a subset of the FID and optical tracking data and verified with the remainder by cross-validation. Following the l

2013

All-optical storage and processing in optical fibers

Luc Thévenaz, Andrey Denisov

The recent possibility to generate and read dynamic Bragg gratings in optical fibers by the interaction of multiple optical waves through stimulated Brillouin scattering has opened a new field to realize all-optical fiber-based functions. ...

IEEE2012

Manipulation of giant Faraday rotation in graphene metasurfaces

Julien Perruisseau-Carrier

Faraday rotation is a fundamental magneto-optical phenomenon used in various optical control and magnetic field sensing techniques. Recently, it was shown that a giant Faraday rotation can be achieved in the low-THz regime by a single monoatomic graphene layer. Here, we demonstrate that this exceptional property can be manipulated through adequate nano-patterning, notably achieving giant rotation up to 6THz with features no smaller than 100 nm. The effect of the periodic patterning on the Faraday rotation i

American Institute of Physics2012

All-optical control of the quantum flow of a polariton condensate

Romuald Houdré, Cristiano Ciuti

Although photons in vacuum are massless particles that do not appreciably interact with each other, significant interactions appear in suitable nonlinear media, leading to hydrodynamic behaviours typical of quantum fluids(1-6). Here, we show the generation ...

Nature Publishing Group2011

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Publications associées (28)

Photovoltaic creation of charged domain walls in barium titanate

Nature Research2026

Hybrid integrated tunable lasers based on thin-film lithium niobate and tantalate

SPIE2026

Floquet topological state induced by light-driven band inversion in SnTe

Springer Science and Business Media LLC2026

Multilayer Light Processor for AI Compute and Networking

IEEE2025

Fine Detection of Process State and Secondary Process Emissions in Laser Powder-bed Fusion (lpbf) by Dual Acoustic Sensor Acquisition and Machine Learning

Jamasp Jhabvala

IOP Publishing Ltd2025

Nanoimprint stamp fabrication by combination of T-SPL and dry etching

2023

Hydraulic performance evaluation of a micro-turbine with counter rotating runners by experimental investigation and numerical simulation

François Avellan, Elena Vagnoni, Loïc Andolfatto, Cécile Münch-Alligné

Pergamon-Elsevier Science Ltd2018

s gravity gradient as a reference. Current sensors require multiple optical heads with access on all faces of a satellite that might point towards the Earth [1]. Earth sensors determine the Earth vector by sensing the position of the Earth’s horizon, detecting the Earth

s IR emission against the background of space [2]. The gravity-gradient based approach does not require optical a

2013