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Related Experiment Video

Updated: Jun 22, 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

Bowtie plasmonic quantum cascade laser antenna.

Nanfang Yu, Ertugrul Cubukcu, Laurent Diehl

    Optics Express
    |June 25, 2009
    PubMed
    Summary
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    We developed a bowtie plasmonic antenna for quantum cascade lasers that confines mid-infrared light below the diffraction limit. This technology enhances chemical and biological imaging resolution.

    Area of Science:

    • Plasmonics
    • Quantum Cascade Lasers
    • Nanophotonics

    Background:

    • Quantum cascade lasers (QCLs) emit coherent mid-infrared (MIR) radiation.
    • Confining MIR radiation below the diffraction limit is crucial for high-resolution imaging and spectroscopy.
    • Existing nano-antennas face challenges in field enhancement control.

    Purpose of the Study:

    • To design and characterize a bowtie plasmonic antenna for MIR QCLs.
    • To achieve sub-diffraction limit confinement of coherent MIR radiation.
    • To improve spatial resolution for chemical and biological applications.

    Main Methods:

    • Fabrication of a bowtie antenna on a MIR QCL facet using gold fan-like segments.
    • Characterization of the antenna's near field using apertureless near-field scanning optical microscopy (SNOM).

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    Last Updated: Jun 22, 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

    Trapping of Micro Particles in Nanoplasmonic Optical Lattice
    07:20

    Trapping of Micro Particles in Nanoplasmonic Optical Lattice

    Published on: September 5, 2017

    Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics
    09:12

    Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

    Published on: May 28, 2016

  • Comparison with nano-rod antennas to evaluate field enhancement suppression.

    • Main Results:

    • Demonstrated field confinement as small as 130 nm at a 7.0 µm wavelength.
    • The bowtie antenna effectively suppresses field enhancement at its outer ends.
    • The antenna is suitable for spatially-resolved, high-resolution chemical and biological imaging and spectroscopy.

    Conclusions:

    • The bowtie plasmonic antenna enables unprecedented spatial resolution for MIR applications.
    • This technology advances the capabilities of quantum cascade lasers for nanoscale sensing.
    • The design offers a pathway to overcome diffraction limits in optical microscopy and spectroscopy.