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Related Experiment Video

Updated: Jun 22, 2026

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Published on: July 8, 2013

Bidirectional subwavelength slit splitter for THz surface plasmons.

Qiaoqiang Gan1, Zhan Fu, Yujie J Ding

  • 1Center for Optical Technologies, Electrical and Computer Engineering Department, Lehigh University, Bethlehem, PA 18015, USA.

Optics Express
|June 25, 2009
PubMed
Summary
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This study demonstrates a novel terahertz (THz) frequency splitter using a subwavelength slit and gratings. This device efficiently separates THz waves by frequency into distinct directions.

Area of Science:

  • Optics and Photonics
  • Terahertz (THz) Technology
  • Nanophotonics

Background:

  • Terahertz (THz) frequency manipulation is crucial for advanced spectroscopy and imaging.
  • Existing THz splitters often face limitations in miniaturization and efficiency.
  • Subwavelength structures offer unique light-matter interaction possibilities at the nanoscale.

Purpose of the Study:

  • To investigate the feasibility of a compact THz frequency splitter.
  • To explore the use of a bidirectional subwavelength slit as a THz wave source.
  • To demonstrate frequency-selective directional guidance of THz waves.

Main Methods:

  • Simulations using two-dimensional finite difference time domain (FDTD) techniques.
  • Design and optimization of grating structures placed around a subwavelength slit.

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Last Updated: Jun 22, 2026

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Published on: July 8, 2013

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  • Analysis of near-field wave propagation and THz wave guiding.

    • Main Results:

    • Successful simulation of a frequency splitter operating at THz frequencies.
    • Demonstration of a subwavelength slit acting as a localized THz excitation source.
    • Effective directional separation of THz waves at different frequencies using optimized gratings.
    • Illustration of optical field confinement influenced by surface structures.

    Conclusions:

    • The proposed subwavelength slit-based device is a feasible approach for THz frequency splitting.
    • Optimized gratings enable directional control of THz waves based on frequency.
    • This technology holds potential for miniaturized THz components and systems.