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Retrieving the spatial distribution of cavity modes in dielectric resonators by near-field imaging and electrodynamics simulations

By Alejandro R. Goñi, Frank Güell, Luis Alberto Pérez, Julian Lopez-Vidrier, J. Oriol Ossó, Eduardo A. Coronado and Joan R. Morante

Abstract

For good performance of photonic devices whose working principle is based on the enhancement of electromagnetic fields obtained by confining light into dielectric resonators with dimensions in the nanometre length scale, a detailed knowledge of the optical mode structure becomes essential. However, this information is usually lacking and can only be indirectly obtained by conventional spectroscopic techniques. Here we unraveled the influence of wire size, incident wavelength, degree of polarization and the presence of a substrate on the optical near fields generated by cavity modes of individual hexagonal ZnO nanowires by combining scanning near-field optical microscopy (SNOM) with electrodynamics calculations within the discrete dipole approximation (DDA). The near-field patterns obtained with very high spatial resolution, better than 50 nm, exhibit striking size and spatial-dispersion effects, which are well accounted for within DDA, using a wavevector-dependent dipolar interaction and considering the dielectric anisotropy of ZnO. Our results show that both SNOM and DDA simulations are powerful tools for the design of optoelectronic devices able to manipulate light at the nanoscale.Fil: Goñi, Alejandro R.. Consejo Superior de Investigaciones Científicas. Instituto de Ciencia de los Materiales de Barcelona; EspañaFil: Güell, Frank. Universidad de Barcelona; EspañaFil: Pérez, Luis Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Lopez-Vidrier, Julian. Universidad de Barcelona; EspañaFil: Ossó, J. Oriol. Universidad de Barcelona; EspañaFil: Coronado, Eduardo A.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Morante, Joan R.. Universidad de Barcelona; Españ

Topics: SEMICONDUCTOR NANOWIRES, NEAR FIELD OPTICAL PROPERTIES, SNOM, ELECTRODYNAMICS SIMULATIONS AND EXPERIMENTS, Nano-materiales, Nanotecnología, INGENIERÍAS Y TECNOLOGÍAS
Publisher: Royal Society of Chemistry
Year: 2011
DOI identifier: 10.1039/c2nr11693f
OAI identifier: oai:ri.conicet.gov.ar:11336/81402
Provided by: CONICET Digital
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