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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Deep subwavelength terahertz waveguides using gap magnetic plasmon.

Atsushi Ishikawa1, Shuang Zhang, Dentcho A Genov

  • 1NSF Nanoscale Science and Engineering Center, University of California, Berkeley, California 94720-1740, USA.

Physical Review Letters
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

We developed a new terahertz (THz) waveguide using magnetic plasmon polaritons in metamaterials. This allows for deep subwavelength THz wave transport in compact integrated devices.

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Area of Science:

  • Photonics
  • Metamaterials
  • Terahertz (THz) technology

Background:

  • Terahertz (THz) wave applications are limited by the diffraction limit.
  • Subwavelength waveguiding is crucial for miniaturizing THz devices.
  • Metamaterials offer unique electromagnetic properties for wave manipulation.

Purpose of the Study:

  • To propose and demonstrate a novel subwavelength THz waveguide.
  • To achieve deep subwavelength confinement of THz waves.
  • To enable THz wave transport in integrated photonic circuits.

Main Methods:

  • Utilizing magnetic plasmon polariton (MPP) modes.
  • Designing a waveguide with a narrow gap in a negative permeability metamaterial.
  • Simulating and analyzing waveguiding in straight, bent, and splitters.

Main Results:

  • Demonstrated deep subwavelength waveguiding (confinement < lambda/10).
  • Achieved low group velocities down to c/21.8.
  • Showcased waveguiding in various configurations including bends and splitters.

Conclusions:

  • The proposed waveguide enables deep subwavelength THz wave transport.
  • The system has no cutoff for core dimensions, offering design flexibility.
  • This technology is promising for integrated THz device applications.