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Related Experiment Video

Updated: May 3, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Transmission bleaching and coupling crossover in a split tapered aperture.

Shuchang Liu, Oleg Mitrofanov, Ajay Nahata

    Optics Express
    |February 12, 2014
    PubMed
    Summary

    We studied spectral transmission of tapered metallic apertures in split plates using terahertz spectroscopy. A small gap broadens spectra by reducing cut-off effects, enabling broadband field concentration.

    Area of Science:

    • Optics and Photonics
    • Terahertz (THz) Spectroscopy
    • Metamaterials and Plasmonics

    Background:

    • Metallic apertures are crucial for manipulating electromagnetic waves.
    • Conical tapering can enhance field concentration and control transmission spectra.
    • Split-plate structures offer unique waveguiding and resonant properties.

    Purpose of the Study:

    • To investigate the spectral transmission properties of conically tapered metallic apertures in split metallic plates.
    • To understand the effect of a gap between plate halves on spectral broadening and field concentration.
    • To propose and validate a novel structure for strong broadband field concentration.

    Main Methods:

    • Terahertz (THz) time-domain spectroscopy was employed to measure spectral transmission.

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  • Numerical simulations were used to validate experimental observations and analyze mode properties.
  • Analysis of transmission spectra as a function of gap spacing.

    • Main Results:

    • A small gap between split plates introduces spectral broadening by reducing the cut-off effect.
    • Transmission spectra can be modeled as a weighted sum of tapered aperture and parallel plate waveguide spectra.
    • Gap spacing acts as a control parameter for the relative spectral contributions.
    • Radiation leakage through the gap limits field concentration in simple split plates.
    • A tapered shell structure was proposed for enhanced broadband field concentration.

    Conclusions:

    • Split metallic plates with conically tapered apertures exhibit tunable spectral broadening due to gap-induced cut-off effect reduction.
    • The proposed tapered shell structure offers a promising route for achieving strong broadband field concentration.
    • Understanding mode properties within these structures is key for optimizing THz applications.