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Título: | Mapping plasmon-enhanced upconversion fluorescence near au nanodisks |
Autor: | Lin, Hung-Ju; Gredin, Patrick; Mortier, Michel; Billot, Laurent; Chen, Zhuoying; García-Martín, Antonio CSIC ORCID ; González Sagardoy, María Ujué CSIC ORCID ; Aigouy, Lionel | Fecha de publicación: | 3-oct-2018 | Citación: | Conferencia Española de Nanofotónica, CEN (2018) | Resumen: | Strategies for controlling and enhancing the fluorescence of molecules and nanocrystals have been the subject of intense research in the past decades. This trend is motivated by the need to develop new highly sensitive biosensors, and by the possibility to improve optoelectronic devices like light emitting diodes and solar cells. Here, we present a study of upconversion fluorescence enhancement effects near Au nanodisks by scanning near-field optical microscopy. The enhancement and localization of light near the metallic structures are directly visualized by using a single Er/Yb-codoped fluorescent nanocrystal glued at the end of a sharp scanning tip. Excitation was achieved in a transmission mode by a linearly polarized laser diode (lambda= 975 nm) focused in the tip-sample region. Fluorescence was detected in the visible range after the absorption of two photons by up-conversion. In general, the fluorescence enhancement pattern presents two lobes aligned in the direction of the incident polarization direction, but the intensity amount and the details of the enhancement distribution strongly depend on the nanodisk size. The observed patterns are in good agreement with the near-field maps calculated by finite-difference time-domain method, both in two and three dimensions above the structures. The relationship between the far-field optical response of the nanostructures and the achieved enhancement is also analyzed. | Descripción: | Trabajo presentado en la Conferencia Española de Nanofotonica (CEN2018), celebrada en Donostia-San Sebastian (España), el 3 al 5 de octubre de 2018 | URI: | http://hdl.handle.net/10261/181834 |
Aparece en las colecciones: | (IMN-CNM) Comunicaciones congresos |
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