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Related Experiment Video

Updated: Mar 30, 2026

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
10:54

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Plasmon-Enhanced below Bandgap Photoconductive Terahertz Generation and Detection.

Afshin Jooshesh1, Vahid Bahrami-Yekta1, Jinye Zhang1

  • 1Department of Electrical and Computer Engineering, University of Victoria , Victoria, British Columbia V8P 5C2, Canada.

Nano Letters
|November 18, 2015
PubMed
Summary

We developed new terahertz (THz) photoconductive switches using plasmon enhancement. These switches offer superior performance and lower cost for THz applications compared to existing commercial devices.

Keywords:
femtosecond physicsmidgap statesnanoplasmonicsphotoconductive switchesterahertz

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Area of Science:

  • Optoelectronics
  • Terahertz (THz) technology
  • Plasmonics

Background:

  • Low-temperature grown gallium arsenide (LT-GaAs) offers desirable properties for photoconductive switches.
  • Conventional terahertz (THz) systems often rely on InGaAs, which has limitations in performance and cost.
  • Operating lasers below the bandgap of the semiconductor material is challenging for efficient THz generation and detection.

Purpose of the Study:

  • To enhance terahertz (THz) photoconductive switches using plasmon enhancement.
  • To combine the advantages of low-temperature grown GaAs with mature 1.5 μm femtosecond lasers.
  • To achieve high-performance THz sources and receivers operating below the bandgap.

Main Methods:

  • Utilizing plasmon enhancement in terahertz (THz) photoconductive switches.
  • Employing low-temperature grown GaAs as the semiconductor material.
  • Using 1.5 μm femtosecond lasers operating below the bandgap of GaAs.

Main Results:

  • Plasmon-enhanced below-bandgap terahertz (THz) switches significantly outperform commercial InGaAs devices.
  • Achieved superior bandwidth and power in both THz sources and receivers.
  • Devices operated well below saturation, indicating potential for further optimization.

Conclusions:

  • Plasmon enhancement enables high-performance terahertz (THz) photoconductive switches using cost-effective materials and lasers.
  • This technology facilitates the development of high-performance, low-cost, portable THz systems.
  • Opens new possibilities for emerging THz applications in spectroscopy, security, medical imaging, and communication.