Giant ultrafast dichroism and birefringence with active nonlocal metasurfaces  

作　　者：Giulia Crotti Mert Akturk Andrea Schirato Vincent Vinel Anton A.Trifonov Ivan C.Buchvarov Dragomir N.Neshev Remo Proietti Zaccaria Paolo Laporta Aristide Lemaître Giuseppe Leo Giulio Cerullo Margherita Maiuri Giuseppe Della Valle 

机构地区：[1]Department of Physics,Politecnico di Milano,20133 Milano,Italy [2]Istituto Italiano di Tecnologia,16163 Genova,Italy [3]Laboratoire Matériaux et Phénomènes Quantiques(MPQ),UniversitéParis Cité&CNRS,75013 Paris,France [4]John Atanasoff Center for Bio and Nano Photonics(JAC BNP),1164 Sofia,Bulgaria [5]Department of Physics,St.Kliment Ohridski University of Sofia,5 James Bourchier Boulevard,1164 Sofia,Bulgaria [6]ARC Centre of Excellence for Transformative Meta-Optical Systems(TMOS),Research School of Physics,Australian National University,Acton,ACT 2601,Australia. [7]Cixi Institute of Biomedical Engineering,Ningbo Institute of Industrial Technology,Chinese Academy of Sciences,Ningbo 315201,China. [8]Istituto di Fotonica e Nanotecnologie(IFN),Consiglio Nazionale delle Ricerche,20133 Milano,Italy. [9]UniversitéParis-Saclay,CNRS,Centre de Nanosciences et de Nanotechnologies,10 Boulevard Thomas Gobert,91120 Palaiseau,France [10]Institut Universitaire de France(IUF),Paris,France

出　　处：《Light(Science & Applications)》2024年第10期2240-2250,共11页光（科学与应用)（英文版）

基　　金：funding from the European Union Horizon 2020 Research and Innovation program under grant agreement no.899673;This work reflects only authors’view and the European Commission is not responsible for any use that may be made of the information it contains.G.D.V.acknowledges the support from the HOTMETA project under the PRIN 2022 MUR program funded by the European Union—Next Generation EU—“PNRR-M4C2,investimento 1.1—“Fondo PRIN 2022”—HOT-carrier METasurfaces for Advanced photonics(HOTMETA);contract no.2022LENW33—CUP:D53D23002290006”.A.S.,G.C.,M.M.and G.D.V.acknowledge financial support by the European Union’s NextGenerationEU Programme with the I-PHOQS Infrastructure[IR0000016,ID D2B8D520,CUP B53C22001750006]“Integrated infrastructure initiative in Photonic and Quantum Sciences”.The work is partly supported by the French RENATECH network;support by the European Union-NextGenerationEU,through the National Recovery and Resilience Plan of the Republic of Bulgaria,SUMMIT BG-RRP-2.004-0008-C0.DN acknowledges the support of the Australian Research Council(CE200100010).

摘　　要：Switching of light polarization on the sub-picosecond timescale is a crucial functionality for applications in a variety of contexts,including telecommunications,biology and chemistry.The ability to control polarization at ultrafast speed would pave the way for the development of unprecedented free-space optical links and of novel techniques for probing dynamical processes in complex systems,as chiral molecules.Such high switching speeds can only be reached with an all-optical paradigm,i.e.,engineering active platforms capable of controlling light polarization via ultrashort laser pulses.Here we demonstrate giant modulation of dichroism and birefringence in an all-dielectric metasurface,achieved at low fluences of the optical control beam.This performance,which leverages the many degrees of freedom offered by all-dielectric active metasurfaces,is obtained by combining a high-quality factor nonlocal resonance with the giant third-order optical nonlinearity dictated by photogenerated hot carriers at the semiconductor band edge.

关 键 词：dielectric surfaces NONLINEARITY 

分 类 号：O436.3[机械工程—光学工程]