期刊
NANO LETTERS
卷 18, 期 8, 页码 4957-4964出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b01785
关键词
Plasmon localization; nanoporous gold; nanosponge; random disorder; near-field scattering-type spectroscopy; Purcell factor
类别
资金
- Deutsche Forschungsgemeinschaft [SPP1839, LI 580/12, RU 1383/5, SCHA 632/24, SPP1840]
- Korea Foundation for International Cooperation of Science and Technology (Global Research Laboratory) [K20815000003]
- German-Israeli Foundation (GIF) [1256]
- Alexander von Humboldt Foundation
- German Academic Exchange Service (DAAD)
- Graduate Program Nanoenergy Research of the State of Lower Saxony
Porous nanosponges, percolated with a three-dimensional network of 10 nm sized ligaments, recently emerged as promising substrates for plasmon-enhanced spectroscopy and (photo)catalysis. Experimental and theoretical work suggests surface plasmon localization in some hot-spot modes as the physical origin of their unusual optical properties, but so far the existence of such hot-spots has not been proven. Here we use scattering-type scanning near-field nanospectroscopy on individual gold nanosponges to reveal spatially and spectrally confined modes at 10 nm scale by recording local near-field scattering spectra. High quality factors of individual hot-spots of more than 40 are demonstrated, predicting high Purcell factors up to 10(6). The observed field localization and enhancement make such nano-sponges an appealing platform for a variety of applications ranging from nonlinear optics to strong-coupling physics.
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