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dc.contributor.authorGailevicius, Darius
dc.contributor.authorSuzuki, T.
dc.contributor.authorStaliunas, Kestutis
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.identifier.citationGailevicius, D.; Suzuki, T.; Staliunas, K. Tilted black-Si: ~0.45 form-birefringence from sub-wavelength needles. "Optics express", 25 Maig 2020, vol. 28, núm. 11, p. 16012-16026.
dc.description.abstractThe self-organised conical needles produced by plasma etching of silicon (Si), known as black silicon (b-Si), create a form-birefringent surface texture when etching of Si orientated at angles of ¿i¿<¿50¿-¿70° (angle between the Si surface and vertical plasma E-field). The height of the needles in the form-birefringent region following 15 min etching was d¿~¿200 nm and had a 100 µm width of the optical retardance/birefringence, characterised using polariscopy. The height of the b-Si needles corresponds closely to the skin-depth of Si ~¿/4 for the visible spectral range. Reflection-type polariscope with a voltage-controlled liquid-crystal retarder is proposed to directly measure the retardance ¿n¿×¿d/¿¿˜¿0.15 of the region with tilted b-Si needles. The quantified form birefringence of ¿n¿=¿-0.45 over ¿¿=¿400¿-¿700 nm spectral window was obtained. Such high values of ¿n at visible wavelengths can only be observed in the most birefringence calcite or barium borate as well as in liquid crystals. The replication of b-Si into Ni-shim with high fidelity was also demonstrated and can be used for imprinting of the b-Si nanopattern into other materials.
dc.format.extent15 p.
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.subjectÀrees temàtiques de la UPC::Física
dc.subject.lcshRaman spectroscopy
dc.subject.otherForm birefringence
dc.subject.otherNonlinear effects
dc.subject.otherRaman spectroscopy
dc.titleTilted black-Si: ~0.45 form-birefringence from sub-wavelength needles
dc.subject.lemacEspectroscòpia Raman
dc.contributor.groupUniversitat Politècnica de Catalunya. DONLL - Dinàmica no Lineal, Òptica no Lineal i Làsers
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
local.citation.authorGailevicius, D.; Suzuki, T.; Staliunas, K.
local.citation.publicationNameOptics express

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