Optical Activation of Germanium Plasmonic Antennas in the Mid-Infrared

被引：54

作者：

Fischer, Marco P. ^{[1
,2
]}

Schmidt, Christian ^{[1
,2
]}

Sakat, Emilie ^{[3
]}

Stock, Johannes ^{[1
,2
]}

Samarelli, Antonio ^{[4
]}

Frigerio, Jacopo ^{[5
]}

Ortolani, Michele ^{[6
]}

Paul, Douglas J. ^{[4
]}

Isella, Giovanni ^{[5
]}

Leitenstorfer, Alfred ^{[1
,2
]}

Biagioni, Paolo ^{[3
]}

Brida, Daniele ^{[1
,2
]}

机构：

[1] Univ Konstanz, Dept Phys, D-78457 Constance, Germany

[2] Univ Konstanz, Ctr Appl Photon, D-78457 Constance, Germany

[3] Politecn Milan, Dipartimento Fis, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy

[4] Univ Glasgow, Sch Engn, Rankine Bldg,Oakfield Ave, Glasgow G12 8LT, Lanark, Scotland

[5] Politecn Milan, Dipartimento Fis, L NESS, Via Anzani 42, I-22100 Como, Italy

[6] Sapienza Univ Rome, Dept Phys, I-00185 Rome, Italy

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 117卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

FIELD ENHANCEMENT; SPECTROSCOPY; SILICON; METAMATERIALS; NANOANTENNAS; RESONANCES; GRATINGS; DEVICES; ARRAYS; LIGHT;

D O I：

10.1103/PhysRevLett.117.047401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Impulsive interband excitation with femtosecond near-infrared pulses establishes a plasma response in intrinsic germanium structures fabricated on a silicon substrate. This direct approach activates the plasmonic resonance of the Ge structures and enables their use as optical antennas up to the mid-infrared spectral range. The optical switching lasts for hundreds of picoseconds until charge recombination redshifts the plasma frequency. The full behavior of the structures is modeled by the electrodynamic response established by an electron-hole plasma in a regular array of antennas.

引用

页数：6

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