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Improvement of Transmittance by Fabricating Broadband Subwavelength Anti-Reflection Structures for Polycarbonate

Title
Improvement of Transmittance by Fabricating Broadband Subwavelength Anti-Reflection Structures for Polycarbonate
Authors
Jang, HS[Jang, H. S.]Kim, JH[Kim, J. H.]Kim, KS[Kim, K. S.]Jung, GY[Jung, G. Y.]Lee, JJ[Lee, J. J.]Kim, GH[Kim, G. H.]
DGIST Authors
Jang, HS[Jang, H. S.]; Kim, JH[Kim, J. H.]
Issue Date
2011-01
Citation
Journal of Nanoscience and Nanotechnology, 11(1), 291-295
Type
Article
Article Type
Article
Keywords
Anti-ReflectionFabricationLaser Interference LithographyNano-ImprintingNano-Imprinting LithographyPattern PeriodPatterned SurfacePlasma EtchingPolycarbonatePolycarbonate FilmsPolycarbonate SubstratesPolycarbonatesSilicon StampSpectral RangeSpectrum RangeSub-WavelengthSub-Wavelength Anti-ReflectionThermal Nano-Imprinting LithographyTransformer-Coupled PlasmasTransmittanceVisible Spectral Range
ISSN
1533-4880
Abstract
We report on how to increase transmittance of a 0.2 mm thick polycarbonate (PC) film by periodic subwavelength anti-reflection structures in the visible spectral range. Subwavelength anti-reflection structures like moth-eyes are fabricated into the polycarbonate substrate itself by thermal nanoimprinting lithography (TH-NIL), which uses silicon stamps that have periodic structures such as gratings (lines and spaces) and pillared dots, and are fabricated by laser interference lithography (LIL) and transformer coupled plasma etching. To increase transmittance of a polycarbonate film, we control the periods and shapes of patterns, the number of patterned surfaces, and the overlapping direction of patterns that are fabricated into its surfaces. As a result of this, we show that average transmittance improves as the pattern period gets shorter and as both surfaces of the film are patterned. We also show that the spectrum range gets larger as the pattern period gets shorter and is determined by the longer pattern period in the case of designing a film to have different pattern period on its surfaces. The maximum average transmittance of a polycarbonate film increases up to approximately 6% compared to a bare sample in the 470-800 nm spectral range. Copyright © 2011 American Scientific Publishers All rights reserved.
URI
http://hdl.handle.net/20.500.11750/3464
DOI
10.1166/jnn.2011.3280
Publisher
American Scientific Publishers
Related Researcher
Files:
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Collection:
Division of Nano∙Energy Convergence Research1. Journal Articles
Smart Textile Convergence Research Group1. Journal Articles


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