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Delay in light transmission through small apertures.

A Dogariu, T Thio, L J Wang

    Optics Letters
    |November 28, 2007
    PubMed
    Summary
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    Researchers developed a new method to measure light pulse delays with 0.5-femtosecond (fs) resolution. This technique revealed light travels at c/7 through subwavelength apertures, indicating resonant interaction with surface modes.

    Area of Science:

    • Optics and Photonics
    • Nanophotonics
    • Ultrafast Science

    Background:

    • Accurate measurement of ultrafast phenomena is crucial for understanding light-matter interactions.
    • Subwavelength structures offer unique optical properties due to light confinement and surface effects.

    Purpose of the Study:

    • To demonstrate a high-resolution technique for measuring pulse propagation time delays.
    • To investigate the transit time of light pulses through subwavelength apertures in metallic films.
    • To explore the resonant interaction of light with surface modes near apertures.

    Main Methods:

    • Utilized a widely available 100-fs pulsed laser system.
    • Developed and applied a novel technique for measuring time delays with 0.5-fs resolution.

    Related Experiment Videos

  • Experimentally determined the time delay of a light pulse traversing subwavelength apertures on a 0.3-μm metallic film.

    • Main Results:

    • Achieved a time delay resolution of 0.5 femtoseconds (fs).
    • Measured a total transit time of 7 fs for a light pulse through subwavelength apertures.
    • Calculated an effective group velocity of c/7 for the light pulse.

    Conclusions:

    • The experimental results provide strong evidence for resonant light interaction with surface modes.
    • The demonstrated technique enables precise measurement of ultrafast optical phenomena.
    • Subwavelength apertures significantly alter light propagation, leading to reduced effective group velocities.