简介：Opticalcamouflageisamagicalcapabilityofanimalsasfirstnoticedin1794byErasmusDarwininZoonomia,butcurrentbiomimeticcamouflagestrategiescannotbereadilyappliedincomplexenvironmentsinvolvingmultispectralandinparticularmulti-polarizationdetection.Herewedevelopaplasmonicapproachtowardbroadbandinfraredpolarimetriccrypsis,wherethepolarizedthermalemissionnearthepseudo-Brewsterangleisthemainsignalsourceandnoexistingpolarizingcamouflagetechniquehasbeendiscoveredinnature.Basedonall-metallicsubwavelengthstructures,anelectrodynamicresistance-reductionmechanismisproposedtoavoidthesignificantpolarization-dependentinfraredabsorption/radiation.Itisalsofoundthatthestructuredmetalsurfacepresentsgiantextrinsicanisotropyregardingthephaseshiftbetweenorthogonalpolarizationstates,whichhelpstorealizeultrahigh-efficiencyandtunablepolarizationconversioninanunprecedentedmanner.Finally,wenotethatthecatenaryopticaltheorymayprovideausefulmeanstoexplainandpredicttheseunusualperformances.

简介：Wehavestudiedaswitchablehyperbolicmetamaterialcomposedofagraphene–dielectricperiodicstructure.Bytuningthechemicalpotentialofallgraphenesheetssimultaneously,theisofrequencycurvecanswitchbetweenanellipseandahyperbolaconveniently.Inparticular,aspecialhyperbolicisofrequencycurvewithitsasymptoteperpendiculartotheinterfaceisobtainedandusedtorealizethezeroreflectioneffect.Furthermore,azeroreflection-basedopticalswitchworkingintheterahertzspectrumisdemonstrated.Itsbandwidthcanbeefficientlyadjustedbygeometricparameterssuchaspermittivityandperiod.Suchanopticalswitchpossessesthemeritsoflowloss,hightransmittancecontrast,highresponsespeed,compactsize,hightoleranceofchemicalpotential,andhavingallincidentangles(0°–90°)simultaneously.Suchanopticalswitchholdsgreatpotentialinmanyfields,suchasdatastorage,beamsteering,andintegratedphotoniccircuits.