Near-Field Mapping of Plasmonic Antennas by Multiphoton Absorption in Poly(methyl methacrylate)
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- 作者：Giorgio Volpe ; Monika Noack ; Srdjan S. A膰imovi膰 ; Carsten Reinhardt ; Romain Quidant
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：September 12, 2012
- 年：2012
- 卷：12
- 期：9
- 页码：4864-4868
- 全文大小：254K
- 年卷期：v.12,no.9(September 12, 2012)
- ISSN：1530-6992
文摘
Mapping the optical near-field response around nanoantennas is a challenging yet indispensable task to engineer light-matter interaction at the nanometer scale. Recently, photosensitive molecular probes, which undergo morphological or chemical changes induced by the local optical response of the nanostructures, have been proposed as a handy alternative to more cumbersome optical and electron-based techniques. Here, we report four-photon absorption in poly(methyl methacrylate) (PMMA) as a very promising tool for nanoimaging the optical near-field around nanostructures over a broad range of near-infrared optical wavelengths. The high performance of our approach is demonstrated on single-rod antennas and coupled gap antennas by comparing experimental maps with 3D numerical simulations of the electric near-field intensity.