Branchlike nano-electrodes for enhanced terahertz emission in photomixers. (4th June 2015)

• Record Type: Journal Article
• Authors: Wu, Qing Yang Steve; Tanoto, Hendrix; Ding, Lu; Choy Chum, Chan; Wang, Bing; Bian Chew, Ah; Banas, Agnieszka; Banas, Krzysztof; Jin Chua, Soo; Teng, Jinghua
• Is Part Of: Nanotechnology. Volume 26:Number 25(2015)
• Publication Date: 2015-06-04
• Subjects: terahertz -- nano-gap electrodes -- photomixer -- LT-GaAs; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/0957-4484/26/25/255201
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: 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.