Strong Spatial and Spectral Localization of Surface Plasmons in Individual Randomly Disordered Gold Nanosponges

被引：23

作者：

Zhong, Jinhui ^{[1
,2
]}

Chimeh, Abbas ^{[1
,2
]}

Korte, Anke ^{[1
,2
]}

Schwarz, Felix ^{[3
,4
]}

Yi, Juemin ^{[1
,2
]}

Wang, Dong ^{[4
,5
]}

Zhan, Jinxin ^{[1
,2
]}

Schaaf, Peter ^{[4
,5
]}

Runge, Erich ^{[3
,4
]}

Lienau, Christoph ^{[1
,2
,6
]}

机构：

[1] Carl von Ossietzky Univ Oldenburg, Inst Phys, D-26129 Oldenburg, Germany

[2] Carl von Ossietzky Univ Oldenburg, Ctr Interface Sci, D-26129 Oldenburg, Germany

[3] Tech Univ Ilmenau, Inst Phys, D-98693 Ilmenau, Germany

[4] Tech Univ Ilmenau, Inst Mikro & Nanotechnol MacroNano, D-98693 Ilmenau, Germany

[5] Tech Univ Ilmenau, Inst Werkstofftech, D-98693 Ilmenau, Germany

[6] Carl von Ossietzky Univ Oldenburg, Forschungszentrum Neurosensor, D-26111 Oldenburg, Germany

来源：

NANO LETTERS | 2018年 / 18卷 / 08期

关键词：

Plasmon localization; nanoporous gold; nanosponge; random disorder; near-field scattering-type spectroscopy; Purcell factor; FIELD OPTICAL MICROSCOPY; NANOPOROUS GOLD; NEAR-FIELD; ANDERSON LOCALIZATION; LIGHT-SOURCE; SCATTERING; NANOPARTICLES; SPECTROSCOPY; TIME; NANOSTRUCTURES;

D O I：

10.1021/acs.nanolett.8b01785

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：4957 / 4964

页数：8

共 62 条

[21] Microscopic origin of surface-plasmon radiation in plasmonic band-gap nanostructures [J].