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Related Concept Videos

Graphical and Analytic Representation of Sinusoids01:20

Graphical and Analytic Representation of Sinusoids

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Analyzing two sinusoidal voltages with equal amplitude and period but different phases on an oscilloscope, an instrument used to display and analyze waveforms, involves a three-step process.
The first step is measuring the peak-to-peak value, which is twice the amplitude of the sinusoid. This provides information about the maximum voltage swing of the waveform.
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Related Experiment Video

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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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Optical antennas with sinusoidal modulation in width.

Dirk Jan Dikken, Frans B Segerink, Jeroen P Korterik

    Optics Express
    |August 10, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed small metal optical antennas with tunable plasmon resonances. Modulating antenna width shifts resonance wavelengths significantly, enabling precise light control for meta-surfaces and beam shaping applications.

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    Area of Science:

    • * Nanophotonics and Plasmonics
    • * Optical Antenna Design and Engineering

    Background:

    • * Small metal structures supporting plasmon resonances are crucial for light manipulation.
    • * These structures offer large scattering cross-sections and light concentration capabilities.

    Purpose of the Study:

    • * To investigate the dipolar plasmon resonances of optical antennas with modulated widths.
    • * To demonstrate control over resonance shifts and field localization using width modulation.

    Main Methods:

    • * Experimental fabrication and optical characterization of sinusoidal width-modulated antennas.
    • * Numerical simulations to analyze resonance shifts and field distributions.
    • * Testing both symmetric and asymmetric antenna designs.

    Main Results:

    • * A small 10 nm width modulation phase shift resulted in a 160 nm resonance shift.
    • * Simulations predicted resonance shifts exceeding 600 nm.
    • * Asymmetric designs produced dual resonances, demonstrating design versatility.

    Conclusions:

    • * Sinusoidal width modulation offers significant spectral tunability for optical antennas.
    • * The design allows control over external field localization while tuning resonance wavelength.
    • * These tunable antennas are promising for meta-surface applications in beam shaping.