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Wavefront control by stacked metal-dielectric hole array with variable hole shapes.

Takayuki Matsui1, Tsuyoshi Nomura, Atsushi Miura

  • 1Toyota Central R&D Labs, Inc, 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan.

Optics Express
|March 14, 2013
PubMed
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A novel stacked metal-dielectric hole array (SHA) enables wavefront control by gradually varying rectangular hole shapes. This design achieves tunable phase control for 1D beam steering applications.

Area of Science:

  • Optics and Photonics
  • Metamaterials
  • Nanophotonics

Background:

  • Wavefront control is crucial for applications like beam steering and optical manipulation.
  • Existing methods often require bulky or complex structures.
  • Metamaterials offer a promising route to miniaturized optical components.

Purpose of the Study:

  • To propose and demonstrate a novel stacked metal-dielectric hole array (SHA) for efficient wavefront control.
  • To investigate the tunability of phase response based on geometric parameters of the holes.
  • To achieve 1-dimensional beam steering using the proposed SHA structure.

Main Methods:

  • Fabrication of a stacked metal-dielectric structure with periodically arranged, in-plane shape-varying rectangular holes.

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  • Experimental characterization of the transmitted phase response as a function of frequency and hole geometry.
  • Analysis of the relationship between hole shape, polarization, and generated wavefront.

    • Main Results:

    • Demonstrated tunable phase dependence on frequency, controlled by the rectangular hole's dimensions.
    • Achieved an in-plane phase difference of 0.6π with an SHA thickness of one-sixth of the wavelength.
    • Successfully generated an inclined wavefront for 1D beam steering.

    Conclusions:

    • The proposed SHA is an effective platform for wavefront control and beam steering.
    • Geometric tuning of hole shape offers a versatile method for manipulating optical phase.
    • This compact design holds potential for integrated photonic devices.