Design of a silicon polarization grating with a sub-wavelength anisotropic structure

Koji Anju, Hiroyuki Tsuda, Hisato Uetsuka

    研究成果: Conference contribution

    1 被引用数 (Scopus)

    抄録

    Polarization gratings, which have the important properties of being highly efficient for first order diffraction and having high polarization sensitivity, can be applied to beam splitters, displays, spectro-polarimeters, and so on. Usually, polarization gratings are fabricated utilizing the periodic anisotropy of liquid crystal molecules. However, high tolerance to light, heat, and humidity is required, in particular, for optical communication applications. Therefore, a polarization grating based on an inorganic material is more suitable than one based on an organic one. We propose a silicon polarization grating with form birefringence induced by an anisotropic surface microstructure with features shorter than the wavelength of light (sub-wavelength anisotropic structure), allowing the birefringence to be controlled through selection of the dimensions of the periodic structure. In this paper, we describe the design of sub-wavelength structures of half wave plates using a thin film of silicon. By optimizing the line width, the line spacing, and the thickness of the film, a transmittance of more than 99% at an incident wavelength of 1550 nm was obtained. A polarization grating based on this half wave plate was designed. The orientation of the half wave plate structure was rotated in a particular direction. Furthermore, we evaluated the wavelength dependence and incident angle dependence of the diffraction efficiency using a finite-difference time-domain method.

    本文言語English
    ホスト出版物のタイトルIntegrated Optics: Devices, Materials, and Technologies XX
    出版社SPIE
    9750
    ISBN(電子版)9781628419856
    DOI
    出版ステータスPublished - 2016
    イベントIntegrated Optics: Devices, Materials, and Technologies XX - San Francisco, United States
    継続期間: 2016 2 152016 2 17

    Other

    OtherIntegrated Optics: Devices, Materials, and Technologies XX
    国/地域United States
    CitySan Francisco
    Period16/2/1516/2/17

    ASJC Scopus subject areas

    • 電子材料、光学材料、および磁性材料
    • 凝縮系物理学
    • コンピュータ サイエンスの応用
    • 電子工学および電気工学
    • 応用数学

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