Terahertz Plasmonic Field-Induced Conductivity Modulation in Gold

被引：1
|
作者：
Elezzabi, A. Y. [1 ]
Maraghechi, P. [1 ]
Greig, S. R. [1 ]
机构：
[1] Univ Alberta, Dept Elect & Comp Engn, Ultrafast Opt & Nanophoton Lab, Edmonton, AB T6G 2V4, Canada
来源：
SCIENTIFIC REPORTS | 2015年 / 5卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
SURFACE-CHARGES; SCATTERING; METALS;
D O I：
10.1038/srep10812
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：
We report the observation of terahertz (THz) electric field induced conductivity modulation in sub-wavelength gold plasmonic media. Through all-THz pump-probe time-resolved transmission spectroscopy, we demonstrate that the presence of induced surface charges influences near-field mediated light propagation. The phenomenon is ascribed to the enhanced metal conductivity due to enhanced surface density of conduction electrons. The surface induced charge dynamics are revealed via phase-dependent time-resolved signatures. The phenomenon is a prelude to a wide class of ultrafast active THz plasmonic devices and paves the way for plasmonic field effects devices, similar to semiconductor ones.
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页数：7
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