title: Branchlike nano-electrodes for enhanced terahertz emission in photomixers.
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.
authors.affiliation: Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), Singapore 117602, Singapore.
authors.forename: Qing Yang Steve
authors.initials: QY
authors.lastname: Wu
authors.forename: Hendrix
authors.initials: H
authors.lastname: Tanoto
authors.forename: Lu
authors.initials: L
authors.lastname: Ding
authors.forename: Chan
authors.initials: C
authors.lastname: Choy Chum
authors.forename: Bing
authors.initials: B
authors.lastname: Wang
authors.forename: Ah
authors.initials: A
authors.lastname: Bian Chew
authors.forename: Agnieszka
authors.initials: A
authors.lastname: Banas
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Banas
authors.forename: Soo
authors.initials: S
authors.lastname: Jin Chua
authors.forename: Jinghua
authors.initials: J
authors.lastname: Teng