Nonlinear plasmonic response of doped nanowires observed by infrared nanospectroscopy

被引：14

作者：

Lang, Denny ^{[1
,3
]}

Balaghi, Leila ^{[1
,2
]}

Winnerl, Stephan ^{[1
]}

Schneider, Harald ^{[1
]}

Huebner, Rene ^{[1
]}

Kehr, Susanne C. ^{[3
]}

Eng, Lukas M. ^{[2
,3
]}

Helm, Manfred ^{[1
,2
,3
]}

Dimakis, Emmanouil ^{[1
]}

Pashkin, Alexej ^{[1
]}

机构：

[1] Helmholtz Zentrum Dresden Rossendorf, Inst Ion Beam Phys & Mat Res, Dresden, Germany

[2] Cfaed Ctr Advancing Elect Dresden, Dresden, Germany

[3] Tech Univ Dresden, Inst Appl Phys, Dresden, Germany

来源：

NANOTECHNOLOGY | 2019年 / 30卷 / 08期

关键词：

s-SNIM; infrared nanospectroscopy; nanowires; free-electron laser; nonlinear plasmonics; InGaAs; GAAS NANOWIRES; TERAHERTZ; SCATTERING; SILICON; SI;

D O I：

10.1088/1361-6528/aaf5a7

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We report a strong shift of the plasma resonance in highly-doped GaAs/InGaAs core/shell nanowires (NWs) for intense infrared excitation observed by scattering-type scanning near-field infrared microscopy. The studied NWs show a sharp plasma resonance at a photon energy of about 125 meV in the case of continuous wave excitation by a CO2 laser. Probing the same NWs with the pulsed free-electron laser with peak electric field strengths up to several 10 kV cm(-1) reveals a power-dependent redshift to about 95 meV and broadening of the plasmonic resonance. We assign this effect to a substantial heating of the electrons in the conduction band and subsequent increase of the effective mass in the nonparabolic Gamma-valley.

引用

页数：7

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