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Related Experiment Video

Updated: Jun 10, 2026

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

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

Published on: July 8, 2013

Designer spoof surface plasmon structures collimate terahertz laser beams.

Nanfang Yu, Qi Jie Wang, Mikhail A Kats

    Nature Materials
    |August 10, 2010
    PubMed
    Summary

    Researchers enhanced terahertz quantum cascade lasers by engineering spoof surface plasmons. This design improves laser performance, including reduced beam divergence and increased power collection efficiency.

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    Area of Science:

    • Optics and Photonics
    • Condensed Matter Physics
    • Semiconductor Devices

    Background:

    • Surface plasmons are crucial for photonic devices at visible and near-infrared wavelengths.
    • Longer-wavelength surface electromagnetic waves (Sommerfeld/Zenneck waves) exhibit poor surface confinement, limiting control with conventional plasmonic structures.
    • Subwavelength periodic surface patterning enables 'spoof' surface plasmons with enhanced confinement at longer wavelengths.

    Discussion:

    • This study demonstrates the enhancement of terahertz quantum cascade lasers (TQCLs) by designing spoof surface plasmon structures.
    • These structures tailor the dispersion of terahertz surface plasmon polaritons on highly doped semiconductor facets.
    • The approach effectively mimics the behavior of surface plasmons at much shorter wavelengths, enabling improved control at terahertz frequencies.

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    Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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    Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

    Published on: July 21, 2018

    Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
    09:33

    Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

    Published on: June 7, 2019

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    Last Updated: Jun 10, 2026

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

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

    Published on: July 8, 2013

    Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
    07:39

    Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

    Published on: July 21, 2018

    Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
    09:33

    Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

    Published on: June 7, 2019

    Key Insights:

    • A simple one-dimensional grating design significantly reduced TQCL beam divergence from ~180 to ~10 degrees.
    • Laser directivity was improved by over 10 decibels.
    • Power collection efficiency increased approximately sixfold compared to unpatterned devices, without compromising high-temperature performance.

    Outlook:

    • This work opens avenues for advanced terahertz optoelectronic devices with tailored surface electromagnetic wave properties.
    • The 'spoof' surface plasmon approach offers a versatile platform for controlling and enhancing light-matter interactions at longer wavelengths.
    • Further research can explore more complex grating designs for even greater performance optimization in TQCLs and other terahertz applications.