The Experts below are selected from a list of 2340 Experts worldwide ranked by ideXlab platform

Toshihiko Baba - One of the best experts on this subject based on the ideXlab platform.

  • wide beam steering by slow light waveguide gratings and a Prism Lens
    Optica, 2020
    Co-Authors: Hiroyuki Ito, Jun Maeda, Daichi Akiyama, Hiroshi Abe, Yuma Kusunoki, Naoya Kodama, Ryo Tetsuya, Toshihiko Baba
    Abstract:

    A lattice-shifted photonic crystal waveguide (LSPCW) maintains slow light as a guided mode and works as an optical antenna when a kind of double periodicity is introduced. Selecting one LSPCW from its array and converting the fan beam to a spot beam using a collimator Lens allows non-mechanical, two-dimensional beam steering. We employed a shallow-etched grating into the LSPCW as the double periodicity to increase the upward emission efficiency and designed a bespoke Prism Lens to convert the steering angle in a desired direction while maintaining the collimation condition for the steered beam. As a result, a sharp spot beam with an average beam divergence of 0.15° was steered in the range of ${40}^\circ \; \times \;{4.4}^\circ $40∘×4.4∘ without precise adjustment of the Lens position. The number of resolution points obtained was 4256. This method did not require complicated and power-consuming optical phase control like that in optical phased arrays, so it is expected to be applied in complete solid-state light detection and ranging.

  • Prism Lens for beam collimation in a silicon photonic crystal beam steering device
    Optics Letters, 2019
    Co-Authors: Jun Maeda, Daichi Akiyama, Hiroyuki Ito, Hiroshi Abe, Toshihiko Baba
    Abstract:

    The doubly periodic Si photonic crystal waveguide operates as a nonmechanical beam-steering device that can be applied in light detection and ranging. In this Letter, we develop and describe a Prism Lens that collimates a fan-shaped beam, emitted from the waveguide independent of the steering angle. Its fundamental profile is investigated using a theoretical analysis for thick Lenses, and then, its detailed aspherical design is obtained. In ray tracing, this Prism Lens suppresses the beam divergence to less than the diffraction limit in most of the targeted beam-steering range. The Prism Lens is fabricated by acrylic cutting, and its expected characteristics are observed.

Jun Maeda - One of the best experts on this subject based on the ideXlab platform.

  • wide beam steering by slow light waveguide gratings and a Prism Lens
    Optica, 2020
    Co-Authors: Hiroyuki Ito, Jun Maeda, Daichi Akiyama, Hiroshi Abe, Yuma Kusunoki, Naoya Kodama, Ryo Tetsuya, Toshihiko Baba
    Abstract:

    A lattice-shifted photonic crystal waveguide (LSPCW) maintains slow light as a guided mode and works as an optical antenna when a kind of double periodicity is introduced. Selecting one LSPCW from its array and converting the fan beam to a spot beam using a collimator Lens allows non-mechanical, two-dimensional beam steering. We employed a shallow-etched grating into the LSPCW as the double periodicity to increase the upward emission efficiency and designed a bespoke Prism Lens to convert the steering angle in a desired direction while maintaining the collimation condition for the steered beam. As a result, a sharp spot beam with an average beam divergence of 0.15° was steered in the range of ${40}^\circ \; \times \;{4.4}^\circ $40∘×4.4∘ without precise adjustment of the Lens position. The number of resolution points obtained was 4256. This method did not require complicated and power-consuming optical phase control like that in optical phased arrays, so it is expected to be applied in complete solid-state light detection and ranging.

  • Prism Lens for beam collimation in a silicon photonic crystal beam steering device
    Optics Letters, 2019
    Co-Authors: Jun Maeda, Daichi Akiyama, Hiroyuki Ito, Hiroshi Abe, Toshihiko Baba
    Abstract:

    The doubly periodic Si photonic crystal waveguide operates as a nonmechanical beam-steering device that can be applied in light detection and ranging. In this Letter, we develop and describe a Prism Lens that collimates a fan-shaped beam, emitted from the waveguide independent of the steering angle. Its fundamental profile is investigated using a theoretical analysis for thick Lenses, and then, its detailed aspherical design is obtained. In ray tracing, this Prism Lens suppresses the beam divergence to less than the diffraction limit in most of the targeted beam-steering range. The Prism Lens is fabricated by acrylic cutting, and its expected characteristics are observed.

Hiroyuki Ito - One of the best experts on this subject based on the ideXlab platform.

  • wide beam steering by slow light waveguide gratings and a Prism Lens
    Optica, 2020
    Co-Authors: Hiroyuki Ito, Jun Maeda, Daichi Akiyama, Hiroshi Abe, Yuma Kusunoki, Naoya Kodama, Ryo Tetsuya, Toshihiko Baba
    Abstract:

    A lattice-shifted photonic crystal waveguide (LSPCW) maintains slow light as a guided mode and works as an optical antenna when a kind of double periodicity is introduced. Selecting one LSPCW from its array and converting the fan beam to a spot beam using a collimator Lens allows non-mechanical, two-dimensional beam steering. We employed a shallow-etched grating into the LSPCW as the double periodicity to increase the upward emission efficiency and designed a bespoke Prism Lens to convert the steering angle in a desired direction while maintaining the collimation condition for the steered beam. As a result, a sharp spot beam with an average beam divergence of 0.15° was steered in the range of ${40}^\circ \; \times \;{4.4}^\circ $40∘×4.4∘ without precise adjustment of the Lens position. The number of resolution points obtained was 4256. This method did not require complicated and power-consuming optical phase control like that in optical phased arrays, so it is expected to be applied in complete solid-state light detection and ranging.

  • Prism Lens for beam collimation in a silicon photonic crystal beam steering device
    Optics Letters, 2019
    Co-Authors: Jun Maeda, Daichi Akiyama, Hiroyuki Ito, Hiroshi Abe, Toshihiko Baba
    Abstract:

    The doubly periodic Si photonic crystal waveguide operates as a nonmechanical beam-steering device that can be applied in light detection and ranging. In this Letter, we develop and describe a Prism Lens that collimates a fan-shaped beam, emitted from the waveguide independent of the steering angle. Its fundamental profile is investigated using a theoretical analysis for thick Lenses, and then, its detailed aspherical design is obtained. In ray tracing, this Prism Lens suppresses the beam divergence to less than the diffraction limit in most of the targeted beam-steering range. The Prism Lens is fabricated by acrylic cutting, and its expected characteristics are observed.

Daichi Akiyama - One of the best experts on this subject based on the ideXlab platform.

  • wide beam steering by slow light waveguide gratings and a Prism Lens
    Optica, 2020
    Co-Authors: Hiroyuki Ito, Jun Maeda, Daichi Akiyama, Hiroshi Abe, Yuma Kusunoki, Naoya Kodama, Ryo Tetsuya, Toshihiko Baba
    Abstract:

    A lattice-shifted photonic crystal waveguide (LSPCW) maintains slow light as a guided mode and works as an optical antenna when a kind of double periodicity is introduced. Selecting one LSPCW from its array and converting the fan beam to a spot beam using a collimator Lens allows non-mechanical, two-dimensional beam steering. We employed a shallow-etched grating into the LSPCW as the double periodicity to increase the upward emission efficiency and designed a bespoke Prism Lens to convert the steering angle in a desired direction while maintaining the collimation condition for the steered beam. As a result, a sharp spot beam with an average beam divergence of 0.15° was steered in the range of ${40}^\circ \; \times \;{4.4}^\circ $40∘×4.4∘ without precise adjustment of the Lens position. The number of resolution points obtained was 4256. This method did not require complicated and power-consuming optical phase control like that in optical phased arrays, so it is expected to be applied in complete solid-state light detection and ranging.

  • Prism Lens for beam collimation in a silicon photonic crystal beam steering device
    Optics Letters, 2019
    Co-Authors: Jun Maeda, Daichi Akiyama, Hiroyuki Ito, Hiroshi Abe, Toshihiko Baba
    Abstract:

    The doubly periodic Si photonic crystal waveguide operates as a nonmechanical beam-steering device that can be applied in light detection and ranging. In this Letter, we develop and describe a Prism Lens that collimates a fan-shaped beam, emitted from the waveguide independent of the steering angle. Its fundamental profile is investigated using a theoretical analysis for thick Lenses, and then, its detailed aspherical design is obtained. In ray tracing, this Prism Lens suppresses the beam divergence to less than the diffraction limit in most of the targeted beam-steering range. The Prism Lens is fabricated by acrylic cutting, and its expected characteristics are observed.

Hiroshi Abe - One of the best experts on this subject based on the ideXlab platform.

  • wide beam steering by slow light waveguide gratings and a Prism Lens
    Optica, 2020
    Co-Authors: Hiroyuki Ito, Jun Maeda, Daichi Akiyama, Hiroshi Abe, Yuma Kusunoki, Naoya Kodama, Ryo Tetsuya, Toshihiko Baba
    Abstract:

    A lattice-shifted photonic crystal waveguide (LSPCW) maintains slow light as a guided mode and works as an optical antenna when a kind of double periodicity is introduced. Selecting one LSPCW from its array and converting the fan beam to a spot beam using a collimator Lens allows non-mechanical, two-dimensional beam steering. We employed a shallow-etched grating into the LSPCW as the double periodicity to increase the upward emission efficiency and designed a bespoke Prism Lens to convert the steering angle in a desired direction while maintaining the collimation condition for the steered beam. As a result, a sharp spot beam with an average beam divergence of 0.15° was steered in the range of ${40}^\circ \; \times \;{4.4}^\circ $40∘×4.4∘ without precise adjustment of the Lens position. The number of resolution points obtained was 4256. This method did not require complicated and power-consuming optical phase control like that in optical phased arrays, so it is expected to be applied in complete solid-state light detection and ranging.

  • Prism Lens for beam collimation in a silicon photonic crystal beam steering device
    Optics Letters, 2019
    Co-Authors: Jun Maeda, Daichi Akiyama, Hiroyuki Ito, Hiroshi Abe, Toshihiko Baba
    Abstract:

    The doubly periodic Si photonic crystal waveguide operates as a nonmechanical beam-steering device that can be applied in light detection and ranging. In this Letter, we develop and describe a Prism Lens that collimates a fan-shaped beam, emitted from the waveguide independent of the steering angle. Its fundamental profile is investigated using a theoretical analysis for thick Lenses, and then, its detailed aspherical design is obtained. In ray tracing, this Prism Lens suppresses the beam divergence to less than the diffraction limit in most of the targeted beam-steering range. The Prism Lens is fabricated by acrylic cutting, and its expected characteristics are observed.