Terahertz Photoconductive Emitter with Dielectric-Embedded High-Aspect-Ratio Plasmonic Grating for Operation with Low-Power Optical Pumps

D. V. Lavrukhin, A. E. Yachmenev, L. A. Glinskiy, R. A. Khabibullin, Y. G. Goncharov, M. Ryzhii, T. Otsuji, I. E. Spektor, M. Shur, K. Nallappan, M. Skorobogatiy, K. I. Zaytsev, D. S. Ponomarev

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Here we report design, optimization and fabrication of a plasmon-assisted terahertz (THz) photoconductive antenna (PCA) for THz pulse generation at low-power optical pumps. The PCA design combines a high-aspect ratio dielectric-embedded plasmonic Au-grating placed into the photoconductive gap. Antenna structure, Si3N4-passivation of the photoconductor and the Al2O3-antireflection coating are used to further enhance antenna performance. Both the plasmon-assisted and conventional pCAs were fabricated for comparative analysis of their transient photocurrents, THz waveforms and THz power spectra. A superior performance of the plasmon-assisted PCA was confirmed. Thus, depending on the optical pump power, the transient photocurrent and the THz power spectrum were 101-102 and 102-103 times higher, respectively, for the plasmonic PCA. The highest THz power enhancement of 3×103 was observed at low-power optical pumps of < 1.0 mW. These results demonstrate a strong potential of the plasmonic PCA for operation with low-power lasers; thus, opening new opportunities for the development of portable and cost-effective THz spectrometers and imaging systems.

Original languageEnglish
Title of host publication2019 International Workshop on Antenna Technology, iWAT 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages21-24
Number of pages4
ISBN (Electronic)9781538682692
DOIs
Publication statusPublished - 2019 Mar
Event2019 International Workshop on Antenna Technology, iWAT 2019 - Miami, United States
Duration: 2019 Mar 32019 Mar 6

Publication series

Name2019 International Workshop on Antenna Technology, iWAT 2019

Conference

Conference2019 International Workshop on Antenna Technology, iWAT 2019
Country/TerritoryUnited States
CityMiami
Period19/3/319/3/6

Keywords

  • Terahertz radiation
  • photoconductive antenna
  • plasmonics

ASJC Scopus subject areas

  • Instrumentation
  • Computer Networks and Communications

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