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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in the...

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Related Experiment Video

Updated: Jun 23, 2026

Demonstration of a Hyperlens-integrated Microscope and Super-resolution Imaging
10:01

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Published on: September 8, 2017

Regenerating evanescent waves from a silver superlens.

Nicholas Fang, Zhaowei Liu, Ta-Jen Yen

    Optics Express
    |May 23, 2009
    PubMed
    Summary

    Researchers regenerated evanescent waves using surface plasmons, observing a broadened bandwidth in silver slabs. This metamaterial superlens approach enables imaging of deep subwavelength features.

    Area of Science:

    • Physics
    • Materials Science
    • Nanotechnology

    Background:

    • Evanescent waves decay exponentially away from a surface, limiting subwavelength imaging.
    • Surface plasmons are collective electron oscillations at a metal-dielectric interface.
    • Superlensing aims to overcome the diffraction limit for high-resolution imaging.

    Purpose of the Study:

    • To investigate the regeneration of evanescent waves as a precursor to superlensing.
    • To explore the role of surface plasmon excitation in enhancing evanescent wave propagation.
    • To demonstrate the potential of metamaterial superlenses for accessing deep subwavelength features.

    Main Methods:

    • Experimental excitation of surface plasmons on a silver slab.
    • Measurement of surface-plasmon bandwidth.

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    Last Updated: Jun 23, 2026

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  • Utilizing a metamaterial superlens structure.

    • Main Results:

    • Observed broadening of the surface-plasmon bandwidth.
    • Demonstrated the regeneration of evanescent waves.
    • Confirmed the ability to access deep subwavelength features.

    Conclusions:

    • Regenerating evanescent waves via surface plasmon excitation is a viable precursor to superlensing.
    • Silver slabs with permittivity near -1 facilitate enhanced surface plasmon behavior.
    • Metamaterial superlenses offer a pathway to imaging beyond the diffraction limit.