INVESTIGADORES
IEMMI Claudio Cesar
artículos
Título:
Polarization imaging with enhanced spatial resolution
Autor/es:
A. PEINADO; A. LIZANA; CLAUDIO IEMMI; J. CAMPOS
Revista:
OPTICS COMMUNICATIONS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2015 vol. 338 p. 95 - 100
ISSN:
0030-4018
Resumen:
Wepresentthedesignandtheexperimentalimplementationofanewimagingset-up,basedonLiquid Crystal technology,abletoobtainsuper-resolvedpolarimetricimagesofpolarimetricsampleswhenthe resolution isdetectorlimited.Theproposedset-upisacombinationoftwomodules.Oneofthemisan imaging Stokespolarimeter,basedonFerroelectricLiquidCrystalcells,whichisusedtoanalyzethe polarization spatialdistributionofanincidentbeam.Theothermoduleisusedtoobtainhighresolved intensity imagesofthesampleinanopticalsystemwhoseresolutionismainlylimitedbytheCCDpixel geometry.ItcontainsacalibratedParallelAlignedLiquidCrystalonSilicondisplayemployedtointroduce controlled linearphases.Asaresult,asetofdifferentlowresolvedintensityimageswithsub-pixel displacements arecapturedbytheCCD.Byproperlycombiningtheseimagesandafterapplyingade- convolutionprocess,asuper-resolvedintensityimageoftheobjectisobtained.Finally,thecombination of thetwodifferentopticalmodulespermitstoemploysuper-resolvedimagesduringthepolarimetric data reductioncalculation,leadingtoa final polarizationimagewithenhancedspatialresolution.The proposed opticalset-upperformanceisimplementedandexperimentallyvalidatedbyprovidingsuper- resolvedimagesofanamplituderesolutiontestandabirefringentresolutiontest.Asignificant im- provementinthespatialresolution(byafactorof1.4)oftheobtainedpolarimetricimages,incom- parison withtheimagesobtainedwiththeregularimagingsystem,isclearlyobservedwhenapplying our proposedtechnique.
