Effect of local field enhancement on the nonlinear terahertz response of a silicon-based metamaterial

被引：47

作者：

Al-Naib, Ibraheem ^{[1
]}

Sharma, Gargi ^{[1
]}

Dignam, Marc M. ^{[2
]}

Hafez, Hassan ^{[1
]}

Ibrahim, Akram ^{[1
]}

Cooke, David G. ^{[3
]}

Ozaki, Tsuneyuki ^{[1
]}

Morandotti, Roberto ^{[1
]}

机构：

[1] INRS EMT, Varennes, PQ J3X 1S2, Canada

[2] Queens Univ, Dept Phys Engn Phys & Astron, Kingston, ON K7L 3N6, Canada

[3] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 19期

基金：

加拿大自然科学与工程研究理事会;

关键词：

RADIATION;

D O I：

10.1103/PhysRevB.88.195203

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We demonstrate the strong effect of the local field enhancement on the nonlinear terahertz response of a hybrid photoexcited silicon/double concentric ring metamaterial structure. The ring resonators enhance the local terahertz electric field by more than a factor of ten, pushing the terahertz-semiconductor interaction into the high-field regime even for moderate-strength incident terahertz pulses. In this regime, terahertz field-induced intervalley scattering in the photoexcited silicon substrate dynamically alters the substrate conductivity, which in turn strongly modifies the pulse transmission. The spatial distribution of the local field enhancement within the resonator structure results in a modified bandwidth, amplitude, and central frequency of the transmission resonance occurring on a subcycle time scale. These results demonstrate an enhancement of the nonlinear terahertz response of silicon-based metamaterials that must be accounted for in the design of terahertz nonlinear devices.

引用

页数：8

共 27 条

[1]

Al-Naib I, 2012, IEEE PHOTON CONF, P554, DOI 10.1109/IPCon.2012.6358740

[2] Polarization and angle independent terahertz metamaterials with high Q-factors [J].