Photolu min esce nee in clud ing fluoresce nee plays a great role in a wide variety of applicati ons from biomedical sensing and imag ing to optoelectr on ics.Therefore,the enhan ceme nt and con trol of photolu min es...Photolu min esce nee in clud ing fluoresce nee plays a great role in a wide variety of applicati ons from biomedical sensing and imag ing to optoelectr on ics.Therefore,the enhan ceme nt and con trol of photolu min esce nee has imme nse impact on both fun dame ntal scie ntific research and aforeme nti oned applicati ons.Among various nano phot tonic schemes and nanostructures to enhance the photoluminescence,we focus on a certain type of nanostructures,hyperbolic metamaterials(HMMs).HMMs are highly ani sotropic metamaterials,which produce intense localized electric fields.Therefore,HMMs n aturally boost photolu min esce nee from dye molecules,qua ntum dots,n itroge n-vaca ncy cen ters in diam on ds,perovskites and tra nsiti on metal dichalcoge nides.We provide an overview of various con figuratio ns of HMMs,i nclud ing metal-dielectric multilayers,trenches,metallic nanowires,and cavity structures fabricated with the use of noble metals,transparent conductive oxides,and refractory metals as plasmonic elements.We also discuss lasing action realized with HMMs.展开更多
Metasurfaces offer a unique playground to tailor the electromagnetic field at subwavelength scale to control polarization,wavefront,and nonlinear processes.Tunability of the optical response of these structures is cha...Metasurfaces offer a unique playground to tailor the electromagnetic field at subwavelength scale to control polarization,wavefront,and nonlinear processes.Tunability 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 materials.However,the nonlinear response of materials is inherently very weak,and,therefore,requires optical excitations with large values of fluence.We 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 platforms.Our results pave the way to fast devices with large modulation amplitude.展开更多
基金L.Y.Beliaev,O.Takayama and A.V.Lavrinenko acknowledge the financial support from Independent Research Fund Denmark(DFF)(Research Project 2,8022-00387B)Denmark.PM acknowledges that the publication was prepared within the framework of Academic Fund Program at the HSE University in 2021(grant No 21-04-056).
文摘Photolu min esce nee in clud ing fluoresce nee plays a great role in a wide variety of applicati ons from biomedical sensing and imag ing to optoelectr on ics.Therefore,the enhan ceme nt and con trol of photolu min esce nee has imme nse impact on both fun dame ntal scie ntific research and aforeme nti oned applicati ons.Among various nano phot tonic schemes and nanostructures to enhance the photoluminescence,we focus on a certain type of nanostructures,hyperbolic metamaterials(HMMs).HMMs are highly ani sotropic metamaterials,which produce intense localized electric fields.Therefore,HMMs n aturally boost photolu min esce nee from dye molecules,qua ntum dots,n itroge n-vaca ncy cen ters in diam on ds,perovskites and tra nsiti on metal dichalcoge nides.We provide an overview of various con figuratio ns of HMMs,i nclud ing metal-dielectric multilayers,trenches,metallic nanowires,and cavity structures fabricated with the use of noble metals,transparent conductive oxides,and refractory metals as plasmonic elements.We also discuss lasing action realized with HMMs.
基金the support of the Russian Science Foundation(Grant No.22-1200204)the financial support from the European Community through the“METAFAST”Project(H2020-FETOPEN-2018-2020,Grant No.899673)+4 种基金the Ministero Italiano dell’Istruzione(MIUR)through the“METEOR”Project(No.PRIN-2020,2020EYLJT_002)the European Union for the financial support through“FESR o FSE,PON Ricerca e Innovazione 2014-2020-DM 1062/2021”the University of Palermo through“Fondo Finalizzato alla Ricerca di Ateneo 2023.”financial support from the European Union,Nextgeneration EU,MUR D.M 737/2021through the Project“Eurostart22”(No.PRJ-0988)
文摘Metasurfaces offer a unique playground to tailor the electromagnetic field at subwavelength scale to control polarization,wavefront,and nonlinear processes.Tunability 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 materials.However,the nonlinear response of materials is inherently very weak,and,therefore,requires optical excitations with large values of fluence.We 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 platforms.Our results pave the way to fast devices with large modulation amplitude.
