Resolving the electromagnetic mechanism of surface-enhanced light scattering at single hot spots

被引：221

作者：

Alonso-Gonzalez, P. ^{[1
]}

Albella, P. ^{[1
,2
,3
]}

Schnell, M. ^{[1
]}

Chen, J. ^{[1
,2
,3
]}

Huth, F. ^{[1
,4
]}

Garcia-Etxarri, A. ^{[2
,3
,5
,6
]}

Casanova, F. ^{[1
,6
]}

Golmar, F. ^{[1
,7
]}

Arzubiaga, L. ^{[1
]}

Hueso, L. E. ^{[1
,6
]}

Aizpurua, J. ^{[2
,3
]}

Hillenbrand, R. ^{[1
,6
]}

机构：

[1] CIC NanoGUNE Consolider, Donostia San Sebastian 20018, Spain

[2] Ctr Fis Mat CSIC UPV EHU, San Sebastian 20018, Spain

[3] DIPC, San Sebastian 20018, Spain

[4] Neaspec GmbH, D-82152 Munich, Germany

[5] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA

[6] Basque Fdn Sci, IKERBASQUE, Bilbao 48011, Spain

[7] INTI CONICET, San Martin, Bs As, Argentina

来源：

NATURE COMMUNICATIONS | 2012年 / 3卷

基金：

欧洲研究理事会;

关键词：

RAMAN-SCATTERING; NEAR-FIELD; SPECTROSCOPY; MOLECULES; NANOPARTICLE; RESONANCES; SPECTRA;

D O I：

10.1038/ncomms1674

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Light scattering at nanoparticles and molecules can be dramatically enhanced in the 'hot spots' of optical antennas, where the incident light is highly concentrated. Although this effect is widely applied in surface-enhanced optical sensing, spectroscopy and microscopy, the underlying electromagnetic mechanism of the signal enhancement is challenging to trace experimentally. Here we study elastically scattered light from an individual object located in the well-defined hot spot of single antennas, as a new approach to resolve the role of the antenna in the scattering process. We provide experimental evidence that the intensity elastically scattered off the object scales with the fourth power of the local field enhancement provided by the antenna, and that the underlying electromagnetic mechanism is identical to the one commonly accepted in surface-enhanced Raman scattering. We also measure the phase shift of the scattered light, which provides a novel and unambiguous fingerprint of surface-enhanced light scattering.

引用

页数：7

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