SNOM characterization of a potential low cost thin gold coated micro-structured grating using a commercial CD substrate
Título del documento: SNOM characterization of a potential low cost thin gold coated micro-structured grating using a commercial CD substrate
Revista: Revista mexicana de física
Base de datos: PERIÓDICA
Número de sistema: 000388945
ISSN: 0035-001X
Autores: 1
2
1
1
1
3
4
2
Instituciones: 1Universidad Autónoma de Madrid, Facultad de Ciencias, Madrid. España
2University of Strathclyde, Department of Physics, Glasgow, Lanark. Reino Unido
3Universidad Nacional Autónoma de México, Posgrado en Ciencia e Ingeniería de Materiales, México, Distrito Federal. México
4Universidad Nacional Autónoma de México, Instituto de Física, México, Distrito Federal. México
Año:
Periodo: Nov-Dic
Volumen: 61
Número: 6
Paginación: 428-431
País: México
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Analítico, teórico
Resumen en inglés 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
Disciplinas: Física y astronomía
Palabras clave: Física,
Optica,
Microscopía óptica de barrido,
Rejillas,
Método de diferencias finitas en el dominio del tiempo
Keyword: Physics and astronomy,
Optics,
Physics,
Scanning optical microscopy,
Gratings,
Finite difference on time domain method
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