SNOM characterization of a potential low cost thin gold coated micro-structured grating using a commercial CD substrate
EntityUAM. Departamento de Física de Materiales
PublisherSociedad Mexicana de Fisica
CitationRevista Mexicana de Fisica 61.6 (2015): 428-431
ISSN0035-001X (print); 1870-3542 (online)
Funded byThis work has been partially supported by Ministerio de Ciencia e Innovacion (project TEC2010-21574-C02-01) and Comunidad de Madrid (P2009/TIC-1476), Spain. E. Camarillo G. recognizes to DGAPA-UNAM support for a sabbatical year at UAM
ProjectGobierno de España. TEC2010-21574-C02-01; Comunidad de Madrid. S2009/TIC-1476/MICROSERES
SubjectsScanning near field optical microscopy (SNOM); Grating; Finite difference time domain technique (FDTD); Física
Rights© Copyright 2015 Elsevier B.V.
In this work near-field optical measurements of a corrugated grating coated with a 30 nm thick gold film are presented. The grating was made using the polycarbonate corrugated substrate of a commercially available recordable CD as template. This has been proved to be a versatile and low cost technique in producing large 1.6 μm period gratings. The study was carried out using a Scanning Near-Field Optical Microscope (SNOM) working in both collection and reflection modes at two different wavelengths, 532 nm and 633 nm. The results illustrate that the intensity patterns of near-field images are strongly polarization-dependent, even showing different periodicity of the localized fields for orthogonal polarization states. When electric field of the light is polarized parallel to the grooves, the periodicity of the SNOM images is coincident with the grating period, whereas when the light is polarized perpendicular to the grooves the SNOM pattern shows a periodicity twice that of the corresponding topography of the grating. Numerical simulations of the SNOM data based on a two-dimensional Finite Difference Time-Domain (2D-FDTD) model have been realized. The results of the simulations are in good agreement with the experimental data, emphasizing the need of performing numerical simulation for the correct interpretation of SNOM data
Google Scholar:Barrio, J. - Lamela, Jorge - Lifante, G. - Sanchez-Alejo, M.A. - De las Heras, C. - Han, T.P.J. - Camarillo, E. - Jaque, F.
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