Near-Field Imaging with a Localized Nonlinear Light Source

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• 作者：Stefano Palomba ; Lukas Novotny
• 刊名：Nano Letters
• 出版年：2009
• 出版时间：November 11, 2009
• 年：2009
• 卷：9
• 期：11
• 页码：3801-3804
• 全文大小：203K
• 年卷期：v.9,no.11(November 11, 2009)
• ISSN：1530-6992

文摘

We demonstrate high-resolution near-field imaging and spectroscopy using the nonlinear optical response of a gold nanoparticle pair as an excitation photon source. Femtosecond pulses of frequencies ω₁ and ω₂ are used to induce a nonlinear polarization at the four wave mixing (4WM) frequency 2ω₁ − ω₂ in the junction of the nanoparticle dimer. The nonlinear response leads to localized photon emission, which is employed as an excitation source for fluorescence and extinction imaging. The principle of this imaging technique is demonstrated for samples of fluorescent nanospheres and tubular J-aggregates.