Perpustakaan Digital ITB

Metasurfacesareengineeredsub-wavelengthstructureswithextraordinaryopticalproper- ties surpassingconventionaloptics,enablingprecisewavefrontcontrolandimaging.How- ever, traditionalforward-designapproachesoftensuffersfromlimitationssuchaslownu- mericalaperturesatnarrowoperatingbandwidths,reducingtheirefficiencyandapplicabil- ity. Thisresearchdevelopsamulti-materialtopologyoptimization(MMTO)frameworkto addressopticalchallengesthroughadvancedinverse-designmethodologies.Byincorporat- ing full-wavedeviceoptimization,theproposedframeworkisabletominimizeefficiency losses anddemonstratehowmulti-materialoptimizationwithinopticalsystemsenable material-specificdesigns,uncoveringnon-intuitive,high-performanceopticaldevices.Ad- ditionally,thePolynomialChaosExpansion-ParetoOptimalTracing(PCE-POT)meta- modelisemployedtoachieverobustaplanaticandachromaticlensdesigns,leveraging efficient computationofSobol’indicestoquantifysensitivitiestouncertainparameters. ResultsrevealthatMMTOintroducesgreaterrefractiveopticalcontrolinmetasurfaces, traditionallydiffraction-dominantdevices,toovercomeefficiencylimitationsandenabling the discoveryofsuperioropticalsystems,particularlyathighnumericalapertures.Asa conceptualdesigntool,thisframeworksupportsrapid,efficient,andreliabledesignitera- tions, offeringvaluableinsightsforinformedengineeringdecisions.