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Fundamental limits for transmission modulation in VO_(2) metasurfaces

Photonics Research 2023年第1期11卷 I0002-I0011页

作者： BOHAN LI ROCIO CAMACHO-MORALES NEUTON LI ANDREA TOGNAZZI MARCO GANDOLFI domenico de ceglia COSTANTINO de ANGELIS ANDREY A.SUKHORUKOV ANDDRAGOMIR N.NESHEV ARC Centre of Excellence for Transformative Meta-Optical Systems(TMOS) Department of Electronic Materials EngineeringResearch School of PhysicsThe Australian National UniversityCanberraACT 2601Australia department of Engineering University of PalermoPalermo 90128Italy Istituto Nazionale di Ottica Consiglio Nazionale delle RicercheBrescia 25123Italy department of Information Engineering University of BresciaBrescia 25123Italy

The interest in dynamic modulation of light by ultra-thin materials exhibiting insulator–metal phase transition,such as VO_(2),has rapidly grown due to the myriad industrial applications,including smart windows and optical ***,for applications in the telecommunication spectral band,the light modulation through a thin VO_(2) film is low due to the presence of strong material ***,we demonstrate tailored nanostructuring of VO_(2) to dramatically enhance its transmission modulation,reaching a value as high as 0.73,which is 2 times larger than the previous modulation *** resulting designs,including free-topology optimization,demonstrate the fundamental limit in acquiring the desired optical performance,including achieving positive or negative transmission *** results on nanophotonic management of lossy nanostructured films open new opportunities for applications of VO_(2) metasurfaces.

关键词： surfaces desired smart

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Giant photoinduced reflectivity modulation of nonlocal resonances in silicon metasurfaces

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Advanced Photonics 2023年第6期5卷 83-91页

作者： Andrea Tognazzi Paolo Franceschini Olga Sergaeva Luca Carletti Ivano Alessandri Giovanni Finco Osamu Takayama Radu Malureanu Andrei V.Lavrinenko Alfonso C.Cino domenico de ceglia Costantino de Angelis University of Palermo Department of EngineeringPalermoItaly National Institute of Optics-National Research Council PalermoItaly University of Brescia Department of Information EngineeringPalermoItaly ITMO University School of Physics and EngineeringSaint-PetersburgRussia ETH Zurich Institute for Quantum ElectronicsDepartment of PhysicsOptical Nanomaterial GroupZurichSwitzerland Technical University of denmark Department of Electrical and Photonics EngineeringKongens LyngbyDenmark

Metasurfaces offer a unique playground to tailor the electromagnetic field at subwavelength scale to control polarization,wavefront,and nonlinear *** of the optical response of these structures is challenging due to the nanoscale size of their constitutive elements.A long-sought solution to achieve tunability at the nanoscale is all-optical modulation by exploiting the ultrafast nonlinear response of ***,the nonlinear response of materials is inherently very weak,and,therefore,requires optical excitations with large values of *** show that by properly tuning the equilibrium optical response of a nonlocal metasurface,it is possible to achieve sizable variation of the photoinduced out-ofequilibrium optical response on the picosecond timescale employing fluences smaller than 250μJ∕cm^(2),which is 1 order of magnitude lower than previous studies with comparable reflectivity variations in silicon *** results pave the way to fast devices with large modulation amplitude.

关键词： nonlocal metasurface nanophotonics ultrafast modulation Fano resonance

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Enhanced second-harmonic generation from two-dimensional MoSe_(2) on a silicon waveguide

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Light(Science & Applications) 2017年第1期6卷 505-511页

作者： Haitao Chen Vincent Corboliou Alexander S Solntsev Duk-Yong Choi Maria A Vincenti domenico de ceglia Costantino de Angelis Yuerui Lu Dragomir N Neshev Nonlinear Physics Centre Research School of Physics and EngineeringAustralian National UniversityCanberraACT 2601Australia Institut d’Optique Graduate School UniversitéParis-SudPalaiseau 91127France Laser Physics Centre Research School of Physics and EngineeringAustralian National UniversityCanberraACT 2601Australia National Research Council Charles M.Bowden LaboratoryRedstone ArsenalValhermoso SpringsAL 35898-5000USA department of Information Engineering and INO CNR University of BresciaVia Branze 38Brescia 25123Italy Research School of Engineering College of Engineering and Computer ScienceAustralian National UniversityCanberraACT 2601Australia

Two-dimensional transition-metal dichalcogenides(TMDCs)with intrinsically broken crystal inversion symmetry and large secondorder nonlinear responses have shown great promise for future nonlinear light ***,the sub-nanometer monolayer thickness of such materials limits the length of their nonlinear interaction with ***,we experimentally demonstrate the enhancement of the second-harmonic generation from monolayer MoSe_(2) by its integration onto a 220-nm-thick silicon *** on-chip integration allows for a marked increase in the interaction length between the MoSe_(2) and the waveguide mode,further enabling phase matching of the nonlinear *** demonstrated TMDC–silicon photonic hybrid integration opens the door to second-order nonlinear effects within the silicon photonic platform,including efficient frequency conversion,parametric amplification and the generation of entangled photon pairs.

关键词： 2D material MoSe_(2) SHG waveguide

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