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Giant photoinduced reflectivity modulation of nonlocal resonances in silicon metasurfaces

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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Comparative case study of two methods to assess the eruptive potential of selected active regions

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Research in Astronomy and Astrophysics 2021年第12期21卷 471-487页

作者： Francesca Zuccarello Ilaria Ermolli Marianna B.Korsós Fabrizio Giorgi Salvo L.Guglielmino Robertus Erdélyi Paolo Romano Dipartimento di Fisica e Astronomia"Ettore Majorana" Universitàdi CataniaVia S.Sofia 78195123 CataniaItaly INAF Osservatorio Astrofisico di Catania Via S.Sofia 781-95123 CataniaItaly INAF Osservatorio Astronomico di Roma Via Frascati 331-00078 Monte Porzio CatoneItaly Department of Physics Aberystwyth UniversityCeredigionCymruSY233BZUK Department of Astronomy E?tv?s Loránd UniversityPazmany P.setany 1/ABudapestH-l 117Hungary Solar Physics&Space Plasma Research Center(SP2RC) School of Mathematics and StatisticsUniversity of SheffieldHicks BuildingHounsfield RoadS37RHUK Gyula Bay Zoltán Solar Observatory(GSO) Hungarian Solar Physics Foundation(HSPF)etofi ter 3.GyulaH-5700Hungary

Solar eruptive events,like flares and coronal mass ejections,are characterized by the rapid release of energy that can give rise to emission of radiation across the entire electromagnetic spectrum and to an abrupt significant increase in the kinetic energy of *** energetic phenomena can have important effects on the space weather conditions and therefore it is necessary to understand their origin,in particular,what is the eruptive potential of an active region(AR).In these case studies,we compare two distinct methods that were used in previous works to investigate the variations of some characteristic physical parameters during the pre-flare states of flaring *** methods consider:i)the magnetic flux evolution and magnetic helicity accumulation,and ii)the fractal and multi-fractal properties of flux concentrations in *** comparative analysis is based on time series of photospheric data obtained by the Solar Dynamics Observatory between March 2011 and June *** selected two distinct samples of ARs:one is distinguished by the occurrence of more energetic M-and X-class flare events,that may have a rapid effect on not just the near-Earth space,but also on the terrestrial environment;the second is characterized by no-flares or having just a few C-and B-class *** found that the two tested methods complement each other in their ability to assess the eruptive potentials of ARs and could be employed to identify ARs prone to flaring *** on the presented case study,we suggest that using a combination of different methods may aid to identify more reliably the eruptive potentials of ARs and help to better understand the pre-flare states.

关键词： Sun:magnetic fields Sun:photosphere Sun:sunspots Sun:flares Sun:activity

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Efficient fully blade-coated perovskite solar cells in air with nanometer-thick bathocuproine buffer layer

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Nano Research 2021年第4期14卷 1034-1042页

作者： Sergio Castro-Hermosa Luana Wouk Izabela Silva Bicalho Luiza de Queiroz Correa Bas de Jong Lucio Cina Thomas M.Brown Diego Bagnis CSEM Brasil Avenida Jose Candido da Silveira200031035-536 Belo HorizonteBrazil CHOSE(Centre for Hybrid and Organic Solar Energy) Department of Electronic EngineeringUniversity of Rome Tor VergataVia del Politecnico 100133 RomeItaly Hydro Engineering and Agricultural Development Research Group(GHIDA) Faculty of EngineeringUniversidad SurcolombianaAvenida Pastrana Borrero-Carrera 1410001 NeivaColombia Cicci Research srl via Giordania 227 58100 GrossetoItaly Department of Biotechnology Chemistry and PharmacyUniversity of SienaVia A.Moro 253100 SienaItaly

Fully printed perovskite solar cells(PSCs)were fabricated in air with all constituent layers,except for electrodes,deposited by the blade coating *** PSCs incorporated,for the first time,a nanometer-thick printed bathocuproine(BCP)hole blocking buffer using blade coating and deposited at relative humidity up to 50%.The PSCs with a p-i-n structure(glass/indium tin oxide(ITO)/poly(3,4-ethylenedioxythiophene)polystyrene sulfonate(PEDOT:PSS)/CH_(3)NH_(3)Pbl_(3)/[6,6]-phenyl-C_(61)-butyric acid methyl ester(PCBM)/BCP/Ag)delivered a maximum power conversion efficiency(PCE)of 14.9%on an active area of 0.5 cm^(2)when measured under standard test *** PSCs with a blade coated BCP delivered performance of 10%and 63%higher(in relative terms)than those incorporating a spin coated BCP or without any BCP film,*** atomic force microscopy(AFM)showed that blade coated films were more homogeneous and acted also as a surface planarizer leading to a reduction of roughness which improved BCP/Ag interface lowering charge *** demonstration of 15%efficient devices with all constituent layers,including nanometer-thick BCP(〜10 nm),deposited by blade coating in air,demonstrates a route for industrialization of this technology.

关键词： perovskite buffer bathocuproine(BCP) blade coating printed electronics

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