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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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High-efficiency subwavelength diffractive optical element in GaAs for 975 nm.

M E Warren, R E Smith, G A Vawter

    Optics Letters
    |October 29, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers created subwavelength diffractive optical elements using binary phase profiles for 975 nm operation. These elements achieve 85% diffraction efficiency, demonstrating effective index modulation for advanced optical applications.

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    Area of Science:

    • Optics and Photonics
    • Nanotechnology
    • Materials Science

    Background:

    • Subwavelength diffractive optical elements offer novel ways to control light.
    • Fabricating features smaller than the wavelength of light is challenging but enables unique optical properties.

    Purpose of the Study:

    • To fabricate subwavelength diffractive optical elements with binary phase profiles for 975 nm operation.
    • To demonstrate the creation of artificial gradient effective index surfaces.
    • To achieve high diffraction efficiency in transmission gratings.

    Main Methods:

    • Design using rigorous coupled-wave analysis.
    • Fabrication via direct-write electron-beam lithography.
    • Pattern transfer using reactive ion-beam etching in Gallium Arsenide (GaAs).

    Main Results:

    • Successfully fabricated subwavelength diffractive optical elements with minimum feature sizes of 63 nm.
    • Demonstrated artificial gradient effective index surfaces by modulating feature size and spacing.
    • Achieved 85% diffraction efficiency into the first order through transmission measurements.

    Conclusions:

    • Subwavelength diffractive optical elements with binary phase profiles are feasible for 975 nm operation.
    • The fabricated elements effectively modulate the refractive index at the subwavelength scale.
    • High diffraction efficiency is achievable, paving the way for advanced optical device applications.