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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Transmission reflection anomaly in second-harmonic generation from a monolayer.

S A van den Berg, E W van der Ham, Q H Vrehen

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    |December 19, 2007
    PubMed
    Summary

    Second-harmonic generation in monolayers shows different transmission and reflection magnitudes. This occurs due to constructive and destructive interference from nonlinear polarization components.

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    Area of Science:

    • Nonlinear optics
    • Materials science

    Background:

    • Second-harmonic generation (SHG) is a key nonlinear optical process.
    • Monolayers offer unique optical properties due to their reduced dimensionality.

    Purpose of the Study:

    • To experimentally investigate the distinct magnitudes of second-harmonic radiation in transmission and reflection from a monolayer.
    • To elucidate the underlying physical mechanism responsible for the observed differences.

    Main Methods:

    • Experimental setup for second-harmonic generation from a monolayer.
    • Optical measurements of transmitted and reflected SHG signals.
    • Analysis of interference effects in nonlinear polarization.

    Main Results:

    • Observed significant differences in the magnitudes of transmitted and reflected second-harmonic radiation.
    • Identified constructive and destructive interference of nonlinear polarization components as the origin.
    • Demonstrated control over SHG output via interference manipulation.

    Conclusions:

    • The interference of nonlinear polarization components critically affects SHG intensity in monolayers.
    • Understanding these interference effects is crucial for optimizing nonlinear optical phenomena in low-dimensional materials.
    • This work provides insights into controlling light-matter interactions at the nanoscale.