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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Published on: November 21, 2019

Vector diffraction from subwavelength optical disk structures: Two-dimensional near-field profiles.

W C Liu, M Kowarz

    Optics Express
    |April 21, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A new finite-difference method accurately models electromagnetic fields around subwavelength structures. This analysis reveals polarization

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    Area of Science:

    • Electromagnetics and Optics
    • Computational Physics

    Background:

    • Calculating electromagnetic fields near subwavelength structures is crucial for optical applications.
    • Existing methods may lack efficiency or accuracy for complex structures like optical disks.

    Purpose of the Study:

    • To develop an efficient finite-difference frequency-domain (FDFD) method for electromagnetic field calculations.
    • To investigate the near-field and far-field diffraction patterns of a focused beam from a Digital Versatile Disk (DVD).

    Main Methods:

    • Implemented an efficient finite-difference frequency-domain (FDFD) method.
    • Applied the FDFD method to simulate a focused beam interacting with a two-dimensional DVD model.
    • Analyzed the resulting near-field and far-field diffraction patterns.

    Main Results:

    • The FDFD method efficiently calculates electromagnetic fields around subwavelength dielectric and metallic structures.
    • Diffraction patterns from a DVD are highly dependent on the illumination polarization.
    • Scalar diffraction theory is insufficient for accurately analyzing DVD diffraction.

    Conclusions:

    • The developed FDFD method provides an accurate and efficient tool for analyzing electromagnetic phenomena in nanophotonics.
    • Polarization effects are critical in understanding light interaction with optical data storage media.
    • Vectorial electromagnetic analysis is necessary for accurate DVD diffraction studies.