Search results for "Photonics"
showing 10 items of 802 documents
PSA-based phase regeneration of DPSK signals in a silicon germanium waveguide
2015
We demonstrate a polarization-assisted PSA-based phase regenerator in a passive low-birefringence SiGe waveguide at low CW pump power. A PSER of 28.6-dB enables a six-fold reduction in phase-error and BER improvement of approximately 2-dB in the regenerated signal.
Optical tweezing using tunable optical lattices along a few-mode silicon waveguide
2018
International audience; Fourteen years ago, optical lattices and holographic tweezers were considered as a revolution, allowing for trapping andmanipulating multiple particles at the same time using laser light. Since then, near-field optical forces have arousedtremendous interest as they enable efficient trapping of a wide range of objects, from living cells to atoms, in integrateddevices. Yet, handling at will multiple objects using a guided light beam remains a challenging task for current on-chipoptical trapping techniques. We demonstrate here on-chip optical trapping of dielectric microbeads and bacteria usingone-dimensional optical lattices created by near-field mode beating along a f…
Development of non-linear nano-structured compounds for the generation of ultrafast impulse dynamics in fiber LASER cavity
2019
My thesis work presented in this doctoral dissertation has started a new research axis within the Carnot Interdisciplinary Laboratory of Burgundy, and is part of the "Information processing devices" program of the Labex ACTION. This research consortium aims to optimize all the steps of an information processing system, using nano-structured materials and non-linear functionalities. In this context, this thesis focuses on the generation of optical signals in the near infrared, with the main objective of hybridizing integrated photonics with fiber laser cavities. These innovative hybrid LASERs offer, by design, many advantages that are particularly sought-after in the field of telecommunicati…
Active Plasmonics in True Data Traffic Applications: Thermo-Optic On/Off Gating Using a Silicon-Plasmonic Asymmetric MachZehnder Interferometer
2012
We present the first system-level demonstration of an active plasmonic device in 10-Gb/s data traffic conditions. An asymmetric silicon-plasmonic Mach-Zehnder interferometer with dielectric-loaded plasmonic waveguides serving as the electrically controlled arms, operates as thermo-optic ON/OFF gating element with 2.8-mu s response time and 10.8-mW power consumption. We present the first system-level demonstration of an active plasmonic device in 10-Gb/s data traffic conditions. An asymmetric silicon-plasmonic Mach-Zehnder interferometer with dielectric-loaded plasmonic waveguides serving as the electrically controlled arms, operates as thermo-optic ON/OFF gating element with 2.8-mu s respon…
ortho -Fluorination of azophenols increases the mesophase stability of photoresponsive hydrogen-bonded liquid crystals
2018
Photoresponsive liquid crystals (LCs) whose alignment can be controlled with UV-Visible light are appealing for a range of photonic applications. From the perspective of exploring the interplay between the light response and the self-assembly of the molecular components, supramolecular liquid crystals are of particular interest. They allow elaborating the structure-property relationships that govern the optical performance of LC materials by subtle variation of the chemical structures of the building blocks. Herein we present a supramolecular system comprising azophenols and stilbazoles as hydrogen-bond donors and acceptors, respectively, and show that ortho-fluorination of the azophenol dr…
Measurement technique for real-time and low-cost biosensing using photonic bandgap structures
2011
We present a sensing technique based on using photonic bandgap structures where only the output power is monitored, without the need of tunable sources or spectrum analyzers, thus providing a real-time and low-cost system.
Neutronic and photonic analysis of the water-cooled Pb17Li test blanket module for ITER-FEAT
2002
Abstract Within the European Fusion Technology Program, the Water-Cooled Lithium Lead (WCLL) DEMO breeding blanket line was selected in 1995 as one of the two EU lines to be developed in the next decade, in particular with the aim of manufacturing a Test Blanket Module (TBM) to be implemented in ITER. This specific goal has been maintained also in ITER-FEAT program even if the general design parameters of the TBMs have reported some changes. This paper is focused on the investigation of the WCLL-TBM nuclear response in ITER-FEAT through detailed 3D-Monte Carlo neutronic and photonic analyses. A 3D heterogeneous model of the most recent design of the WCLL-TBM has been set-up simulating reali…
Bimodal Approach for Noise Figures of Merit Evaluation in Quantum-Limited Josephson Traveling Wave Parametric Amplifiers
2022
The advent of ultra-low noise microwave amplifiers revolutionized several research fields demanding quantum-limited technologies. Exploiting a theoretical bimodal description of a linear phase-preserving amplifier, in this contribution we analyze some of the intrinsic properties of a model architecture (i.e., an rf-SQUID based Josephson Traveling Wave Parametric Amplifier) in terms of amplification and noise generation for key case study input states (Fock and coherents). Furthermore, we present an analysis of the output signals generated by the parametric amplification mechanism when thermal noise fluctuations feed the device.
Near‐field optical addressing of single molecules in coplanar geometry: a theoretical study
2001
Photonic transfer through elongated optical structures of submicrometre section microfabricated at the surface of dielectric or semiconductor samples can be enhanced by an appropriate structuring of the local refraction index. We show from computerized simulations that both the light localization and the spectroscopic properties of such structures can be used to selectively excite, in coplanar geometry, individuals molecules located in the near-field.