September 3, 2012

LIGHT-DRIVEN PLASMONIC COLOR FILTERS BY OVERLAYING PHOTORESPONSIVE LIQUID CRYSTALS ON GOLD ANNULAR APERTURE ARRAYS


 "Light-Driven Plasmonic Color Filters by Overlaying Photoresponsive Liquid Crystals on Gold Annular Aperture Arrays". Y. J. Liu, G. Y. Si, E. S. P. Leong, N. Xiang, A. J. Danner, J. H. Teng. ADVANCED MATERIALS 24, O-131 (2012). DOI: 10.1002/adma.201104440

Light-driven plasmonic color filters are demonstrated by integrating gold annular aperture arrays with photoresponsive liquid crystals (LCs). Upon photoirradiation, a nematic−isotropic phase transition of the LCs arises from the transcis photoisomerization of photochromic LCs. As a consequence, the effective refractive index experienced by the impinging light changes, modulating the transmission intensity. 

Se muestran filtros de color plasmónicos controlados con luz, integrados a arreglos de aperturas anulares de oro con cristales líquidos fotosensibles (LCs). Bajo iluminación ocurre una transición de fase nemático-isotrópica de los LCs, a partir de la fotoisomerización trans-cis de los LCs fotocrómicos. Como consecuencia, el índice de refracción efectivo cambia para la luz incidente, modulando así la intensidad de luz transmitida.

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