Branchlike nano-electrodes for enhanced terahertz emission in photomixers

被引：8

作者：

Wu, Qing Yang Steve ^{[1
]}

Tanoto, Hendrix ^{[1
]}

Ding, Lu ^{[1
]}

Chum, Chan Choy ^{[1
]}

Wang, Bing ^{[2
]}

Chew, Ah Bian ^{[1
]}

Banas, Agnieszka ^{[3
]}

Banas, Krzysztof ^{[3
]}

Chua, Soo Jin ^{[4
]}

Teng, Jinghua ^{[1
]}

机构：

[1] ASTAR, Inst Mat Res & Engn, Singapore 117602, Singapore

[2] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China

[3] Natl Univ Singapore, Singapore Synchrotron Light Source, Singapore 117576, Singapore

[4] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117576, Singapore

来源：

NANOTECHNOLOGY | 2015年 / 26卷 / 25期

关键词：

terahertz; nano-gap electrodes; photomixer; LT-GaAs; TEMPERATURE-GROWN GAAS; QUANTUM-CASCADE LASERS; PHOTOCONDUCTIVE ANTENNAS; HETERODYNE CONVERSION; SPECTROMETER; GENERATION; DIPOLE;

D O I：

10.1088/0957-4484/26/25/255201

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Branchlike nano-electrode structures were found to improve the THz emission intensity of a photomixer by approximately one order of magnitude higher than that of a photomixer with one row of nano-electrodes separated by the same 100 nm gap. The enhancement is attributed to a more efficient collection of generated carriers, which is in turn due to a more intense electric field under the branchlike nano-electrodes' structures. This is coupled with an increased number of effective areas where strong tip-to-tip THz field enhancements were observed. The optical-to-THz conversion efficiency of the photomixers with the new branchlike nano-electrodes was found to be 10 times higher. The more efficient THz photomixer will greatly benefit the development of continuous-wave THz imaging and spectroscopy systems.

引用

页数：6

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