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Multi-direction bending sensing based on spot pattern demodulation of dual-hole fiber

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Chinese Optics Letters 2023年第12期21卷 92-96页

作者：李波瑶梁瑶瑶谢仲业左小杰孙敬华 School of Electronic Engineering and Intelligentization Dongguan University of TechnologyDongguan 523808China centre de nanosciences et de nanotechnologies CNRSUniversitéParis-SaclayC2N91120 PalaiseauFrance

A multi-direction bending sensor based on spot pattern demodulation of a dual-hole fiber(DHF)is *** using the interference and scattering in a DHF,the related multidirectional variations can be captured by the optical ***,the multi-directional bending characteristics of the fiber are quantitatively described by the pattern of the output light spot,achieving multidirectional bending *** addition,considering the subtle changes in the deformation patterns over time,a convolutional neural network(CNN)model based on deep learning is introduced for accurate recognition and prediction of the bending *** experimental results show that the sensor can perceive different bending angles in four *** outstanding results indicate that the multi-directional bending sensor based on dual-hole interference pattern decoding has potential applications in multi-directional quantitative sensing and artificial intelligence perception.

关键词： microstructured optical fiber fiber device bending sensor

On-chip generation of hybrid polarization-frequency entangled biphoton states

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Photonics Research 2023年第2期11卷 270-278页

作者： S.FRANCESCONI A.RAYMOND R.DUHAMEL P.FILLOUX A.LEMAITRE P.MILMAN M.I.AMANTI F.BABOUX S.DUCCI Université Paris Cité CNRSLaboratoire Matériaux et Phénomènes Quantiques75013 ParisFrance Université Paris-Saclay CNRSCentre de Nanosciences et de Nanotechnologies91120 PalaiseauFrance

We demonstrate a chip-integrated semiconductor source that combines polarization and frequency entanglement,allowing the generation of entangled biphoton states in a hybrid degree of freedom without *** Al Ga As device is based on type-Ⅱ spontaneous parametric downconversion in a counterpropagating phasematching scheme in which the modal birefringence lifts the degeneracy between the two possible nonlinear interactions. This allows the direct generation of polarization–frequency entangled photons at room temperature and telecom wavelength, and in two distinct spatial modes, offering enhanced flexibility for quantum information protocols. The state entanglement is quantified by a combined measurement of the joint spectrum and Hong–Ou–Mandel interference(raw visibility 70.1% ± 1.1%) of the biphotons, allowing to reconstruct a restricted density matrix in the hybrid polarization–frequency space.

关键词： space. matching restricted

Hybrid silicon slotted photonic crystal waveguides:how does third order nonlinear performance scale with slow light?

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Photonics Research 2016年第6期4卷 257-261页

作者： Junfei Xia Samuel Serna Weiwei Zhang Laurent Vivien éric Cassan centre de nanosciences et de nanotechnologies UMR 9001 (CNRS/Université Paris-Sud)Université Paris-Saclay Laboratoire Charles Fabry Institut d’Optique CNRS Université Paris-Sud

We investigate in this paper the influence of slow light on the balance between the Kerr and two-photon absorption(TPA) processes in silicon slotted hybrid nonlinear waveguides. Three typical silicon photonic waveguide geometries are studied to estimate the influence of the light slow-down factor on the mode field overlap with the silicon region, as well as on the complex effective nonlinear susceptibility. It is found that slotted photonic crystal modes tend to focalize in their hollow core with increasing group index(n_G) values. Considering a hybrid integration of nonlinear polymers in such slotted waveguides, a relative decrease of the TPA process by more factor of 2 is predicted from n_G=10 to n_G=50. As a whole, this work shows that the relative influence of TPA decreases for slotted waveguides operating in the slow light regime, making them a suitable platform for third-order nonlinear optics.

关键词： mode Hybrid silicon slotted photonic crystal waveguides:how does third order nonlinear performance scale with slow light

Very-high-frequency probes for atomic force microscopy with silicon optomechanics

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Microsystems & Nanoengineering 2022年第2期8卷 35-48页

作者： L.Schwab P.E.Allain N.Mauran X.Dollat L.Mazenq D.Lagrange M.Gély S.Hentz G.Jourdan I.Favero B.Legrand Laboratoire d'Analyse et d'Architecture des Systemes Universite de ToulouseCNRS UPR 800131031 ToulouseFrance Laboratoire Materiaux et Phenomenes Quantiques Universite de ParisCNRS UMR 716275013 ParisFrance Universite Grenoble Alpes CEALETIMinatec Campus38000 GrenobleFrance

Atomic force microscopy(AFM)has been consistently supporting nanosciences and nanotechnologies for over 30 years and is used in many fields from condensed matter physics to *** enables the measurement of very weak forces at the nanoscale,thus elucidating the interactions at play in fundamental ***,we leverage the combined benefits of micro/nanoelectromechanical systems and cavity optomechanics to fabricate a sensor for dynamic mode AFM at a frequency above 100 *** frequency is two decades above the fastest commercial AFM probes,suggesting an opportunity for measuring forces at timescales unexplored thus *** fabrication is achieved using very-large-scale integration technologies derived from photonic silicon *** probe's optomechanical ring cavity is coupled to a 1.55 pm laser light and features a 130 MHz mechanical resonance mode with a quality factor of 900 in air.A limit of detection in the displacement of 3×10^(-16)m/VHz is obtained,enabling the detection of the Brownian motion of the probe and paving the way for force sensing experiments in the dynamic mode with a working vibration amplitude in the picometer *** inserted in a custom AFM instrument embodiment,this optomechanical sensor demonstrates the capacity to perform force-distance measurements and to maintain a constant interaction strength between the tip and sample,an essential requirement for AFM *** indeed show a stable closed-loop operation with a setpoint of 4 nN/nm for an unprecedented subpicometer vibration amplitude,where the tip-sample interaction is mediated by a stretched water meniscus.

关键词： cavity maintain instrument

Cavity-based photoconductive sources for real-time terahertz imaging

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Photonics Research 2020年第6期8卷 858-863页

作者： J.HAWECKER V.PISTORE A.MINASYAN K.MAUSSANG J.PALOMO I.SAGNES J.-M.MANCEAU R.COLOMBELLI J.TIGNON J.MANGENEY AND S.S.DHILLON Laboratoire de Physique de I'Ecole normale superieure ENSUniversite PSLCNRSSorbonne UniversiteUniversite de ParisF-75005 ParisFrance i2S 28-30 rue Jean Perrin 33608 PessacFrance centre de nanosciences et de nanotechnologies(C2N) CNRS UMR 9001Universite Paris-Saclay91120 PalaiseauFrance Institut d'Electronique et des Systemes CNRS(UMR 5214)Univ Montpellier860 rue de Saint-Priest34095 Montpellier Cedex 5France

Optically driven photoconductive switches are one of the predominant sources currently used in terahertz im-aging ***,owing to their low average powers,only raster-based images can be taken,resulting in slow *** this work,we show that by placing a photoconductive switch within a cavity,we are able to generate absolute average THz powers of 181μW with the frequency of the THz emission centered at 1.5 THz-specifications ideally adapted to applications such as non-destructive *** cavity is based on a metal-insulator-metal structure that permits an en hancement of the average power by almost 1 order of magnitude compared to a standard structure,while conserving a broadband spectral *** demonstrate proof-of-principle real-time imaging using this source,with the broadband spectrum permitting to eliminate strong diffraction artifacts.

关键词： photoconductive sources cavity

Surface-Engineered Li4Ti5O12 nanostructures for High-Power Li-Ion Batteries

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Nano-Micro Letters 2020年第2期12卷 235-245页

作者： Binitha Gangaja Shantikumar Nair Dhamodaran Santhanagopalan centre for nanosciences and Molecular Medicine Amrita Vishwa Vidyapeetham

Materials with high-power charge–discharge capabilities are of interest to overcome the power limitations of conventional Li-ion *** this study,a unique solvothermal synthesis of Li4Ti5O12 nanoparticles is proposed by using an off-stoichiometric precursor ratio.A Li-deficient off-stoichiometry leads to the coexistence of phaseseparated crystalline nanoparticles of Li4Ti5O12 and TiO2 exhibiting reasonable high-rate ***,after the solvothermal process,an extended aging of the hydrolyzed solution leads to the formation of a Li4Ti5O12 nanoplate-like structure with a self-assembled disordered surface layer without crystalline *** Li4Ti5O12 nanoplates with the disordered surface layer deliver ultrahighrate performances for both charging and discharging in the range of 50–300C and reversible capacities of 156 and 113 mAh g−1 at these two rates,***,the electrode exhibits an ultrahigh-charging-rate capability up to 1200C(60 mAh g−1;discharge limited to 100C).Unlike previously reported high-rate half cells,we demonstrate a high-power Li-ion battery by coupling Li4Ti5O12 with a high-rate LiMn2O4 *** full cell exhibits ultrafast charging/discharging for 140 and 12 s while retaining 97 and 66% of the anode theoretical capacity,***-(25℃),low-(−10℃),and high-(55℃)temperature cycling data show the wide temperature operation range of the cell at a high rate of 100C.

关键词： Ultrafast charging Li-ion battery Lithium titanate Off-stoichiometric synthesis Surface chemistry

Direct observation of zero modes in a non-Hermitian optical nanocavity array

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Photonics Research 2022年第2期10卷 574-586页

作者： Flore Hentinger Melissa Hedir Bruno Garbin Mathias Marconi Li Ge Fabrice Raineri Juan A.Levenson Alejandro M.Yacomotti centre de nanosciences et de nanotechnologies CNRSUniversite Paris-SudUniversite Paris-Saclay91120 PalaiseauFrance Universite Cote d'Azur Institut de Physique de NiceCNRS-UMR 7010Sophia AntipolisFrance department of Physics and Astronomy College of Staten IslandCUNYStaten IslandNew York 10314USA Graduate Center CUNYNew YorkNew York 10016USA Universite de Paris 75205 Paris Cedex 13France

Zero modes are symmetry protected ones whose energy eigenvalues have zero real parts. In Hermitian arrays, they arise as a consequence of the sublattice symmetry, implying that they are dark modes. In non-Hermitian systems that naturally emerge in gain/loss optical cavities, particle-hole symmetry prevails instead;the resulting zero modes are no longer dark but feature π∕2 phase jumps between adjacent cavities. Here, we report on the direct observation of zero modes in a non-Hermitian three coupled photonic crystal nanocavities array containing quantum wells. Unlike the Hermitian counterparts, the observation of non-Hermitian zero modes upon single pump spot illumination requires vanishing sublattice detuning, and they can be identified through far-field imaging and spectral filtering of the photoluminescence at selected pump locations. We explain the zero-mode coalescence as a parity-time phase transition for small coupling. These zero modes are robust against coupling disorder and can be used for laser mode engineering and photonic computing.

关键词： pump optical tuning

Nonlinear gallium phosphide nanoscale photonics[Invited]

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Photonics Research 2018年第5期6卷 I0068-I0074页

作者： AUde MARTIN SYLVAIN COMBRIE ALFREDO de ROSSI GREGOIRE BEAUDOIN ISABELLE SAGNES FABRICE RAINERI centre de nanosciences et de nanotechnologies CNRSUniversite Paris-SudUniversite Pans-SaclayC2N Marcoussis91460 MarcoussisFrance Thales Research and Technology France 1 avenue Augustin Fresnel91120 PalaiseauFrance Universite Paris Diderot Sorbone Paris Cite75013 ParisFrance

We introduce a nanoscale photonic platform based on gallium phosphide. Owing to the favorable material properties, peak power intensity levels of 50 GW∕cm^2 are safely reached in a suspended membrane. Consequently,the field enhancement is exploited to a far greater extent to achieve efficient and strong light–matter *** an example, parametric interactions are shown to reach a deeply nonlinear regime, revealing cascaded fourwave mixing leading to comb generation and high-order soliton dynamics.

关键词： Nonlinear gallium phosphide nanoscale photonics

Edge-emitting polariton laser and amplifier based on a ZnO waveguide

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Light(Science & Applications) 2018年第1期7卷 247-254页

作者： O.Jamadi F.Reveret P.Disseix F.Medard J.Leymarie A.Moreau D.Solnyshkov C.deparis M.Leroux E.Cambril S.Bouchoule J.Zuniga-Perez G.Malpuech Institut Pascal PHOTON-N2UniversitéClermont AuvergneCNRSSIGMA ClermontF-63000 Clermont-FerrandFrance UCA CRHEA-CNRSValbonne F-06560France centre nanosciences et nanotechnologies(C2N) CNRSUniversity Paris-SaclayMarcoussis F-91460France

We demonstrate edge-emitting exciton-polariton(polariton)laser operation from 5 to 300 K and polariton amplifiers based on polariton modes within ZnO *** guided mode dispersion below and above the lasing threshold is directly measured using gratings placed on top of the sample,fully demonstrating the polaritonic nature of the lasing *** threshold is found to be smaller than that expected for radiative polaritons in planar ZnO microcavities below 150 K and comparable *** results open up broad perspectives for guided polaritonics by enabling easier and more straightforward implementation of polariton integrated circuits that exploit fast propagating polaritons,and,possibly,topological protection.

关键词： amplifier waveguide laser