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All-dielectric polarization-independent optical angular filter.

Qinyu Qian1,2, Changqing Xu1, Chinhua Wang3,4

  • 1College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006, China.

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|November 30, 2017
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We developed a novel all-dielectric angular filter using a one-dimensional photonic crystal (1D PC) for polarization-independent light filtering. This device offers efficient angular filtering with high transmission, suitable for various optical applications.

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Area of Science:

  • Photonics
  • Materials Science
  • Optical Engineering

Background:

  • Angular filters are crucial optical components for controlling light directionality.
  • Existing filters often suffer from polarization dependence or complex fabrication.
  • All-dielectric photonic crystals offer a promising platform for advanced optical devices.

Purpose of the Study:

  • To design and demonstrate a polarization-independent angular filter.
  • To utilize a one-dimensional photonic crystal (1D PC) for efficient angular filtering.
  • To achieve a simple, semiconductor-compatible, and easily fabricated angular filter.

Main Methods:

  • Fabrication of a 1D photonic crystal (PC) using Si/SiO2 pairs via multilayer sputtering.
  • Utilizing near-symmetric directional band gaps for p- and s-polarized light.
  • Leveraging Fabry-Pérot (F-P) resonances for enhanced filtering performance.

Main Results:

  • Experimental demonstration of an all-dielectric, polarization-independent angular filter.
  • Achieved a narrow divergence angle of 2.2° for the transmitted beam at 1550 nm.
  • Obtained high transmission of 0.8 at normal incidence.

Conclusions:

  • The proposed angular filter is polarization-independent, all-dielectric, and semiconductor-compatible.
  • The simple structure and easy fabrication make it suitable for large-area applications.
  • Potential applications include lighting, beam manipulation, optical coupling, and optical communications.