Third Harmonic Mechanism in Complex Plasmonic Fano Structures

被引：106

作者：

Metzger, Bernd ^{[1
,2
]}

Schumacher, Thorsten ^{[1
,2
,3
,4
]}

Hentschel, Mario ^{[1
,2
,3
]}

Lippitz, Markus ^{[1
,2
,3
,4
]}

Giessen, Harald ^{[1
,2
]}

机构：

[1] Univ Stuttgart, Inst Phys 4, D-70569 Stuttgart, Germany

[2] Univ Stuttgart, Res Ctr SCoPE, D-70569 Stuttgart, Germany

[3] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

[4] Univ Bayreuth, D-95447 Bayreuth, Germany

来源：

ACS PHOTONICS | 2014年 / 1卷 / 06期

关键词：

nano optics; plasmonics; nonlinear optics; spectroscopy; third harmonic generation; Fano resonance; 2ND-HARMONIC GENERATION; 3RD-HARMONIC GENERATION; NANOANTENNAS; RESONANCES; METAMATERIALS; SPECTROSCOPY; ANALOG; LIGHT;

D O I：

10.1021/ph5000677

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We perform third harmonic spectroscopy of dolmen-type nanostructures, which exhibit plasmonic Fano resonances in the near-infrared. Strong third harmonic emission is predominantly radiated close to the low energy peak of the Fano resonance. Furthermore, we find that the third harmonic polarization of the subradiant mode interferes destructively and diminishes the nonlinear signal in the far-field. By comparing the experimental third harmonic spectra with finite element simulations and an anharmonic oscillator model, we find strong indications that the source of the third harmonic is the optical nonlinearity of the bare gold enhanced by the resonant plasmonic polarization.

引用

页码：471 / 476

页数：6

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