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Proceedings Paper

Sub-wavelength nano-electrode structures to improve the performance of terahertz photomixers
Author(s): Qing Yang Steve Wu; Hendrix Tanoto; Ding Lu; Chan Choy Chum; Mei Sun; Zhi Ning Chen; Soo Jin Chua; Jinghua Teng
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Paper Abstract

By utilizing the sub-wavelength metallic structures in the active region of the photomixer, the confinement and concentration of electric field from optical pump lasers on a photoconductive substrate can be efficiently achieved as these sub-wavelength metallic structures are exhibiting the nano-antenna effect over a high index photoconductive substrate. Designing the sub-wavelength metallic structures, branch-like nano-electrodes structures, a new strategy to improve carrier capture was developed in which more carrier collection points occupy across the area of the pumping laser source. These branch-like nano-electrode structures were found to improve THz emission intensity of a photomixer by approximately one order of magnitude and optical-to-THz conversion efficiency by 10 times higher than that of photomixer with one row of nano-electrodes separated by the same 100nm gap. The enhancement is attributed to a more efficient collection of generated carriers due to a more intense electric field under the branch-like nano-electrodes structures. This is coupled with increased effective areas where strong tip-to-tip THz field enhancements were observed. The more efficient THz photomixer will greatly benefit the development of continuous wave THz imaging and spectroscopy system.

Paper Details

Date Published: 25 February 2016
PDF: 6 pages
Proc. SPIE 9747, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX, 974703 (25 February 2016); doi: 10.1117/12.2202416
Show Author Affiliations
Qing Yang Steve Wu, A*STAR Institute of Materials Research and Engineering (Singapore)
Hendrix Tanoto, A*STAR Institute of Materials Research and Engineering (Singapore)
Ding Lu, A*STAR Institute of Materials Research and Engineering (Singapore)
Chan Choy Chum, A*STAR Institute of Materials Research and Engineering (Singapore)
Mei Sun, Institute for Infocomm Research, A*STAR (Singapore)
Zhi Ning Chen, National Univ. of Singapore (Singapore)
Soo Jin Chua, National Univ. of Singapore (Singapore)
Jinghua Teng, A*STAR Institute of Materials Research and Engineering (Singapore)


Published in SPIE Proceedings Vol. 9747:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications IX
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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