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Angle Insensitive Color Filters in Transmission Covering the Visible Region.

Kening Mao1, Weidong Shen1, Chenying Yang1

  • 1State key laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China.

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|January 15, 2016
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Summary
This summary is machine-generated.

This study presents an angle-insensitive color filter using a Metal-Silicon Oxide-Metal structure. The filter maintains consistent transmitted color across various incidence angles, crucial for optical applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Traditional color filters suffer from color shifts at different viewing angles.
  • Maintaining color fidelity under varying incidence angles is a significant challenge in optical filter design.

Purpose of the Study:

  • To propose and demonstrate an angle-insensitive color filter.
  • To achieve consistent perceived transmitted color for p-polarization light from 0° to 60° incidence angles.
  • To investigate the role of silicon oxide (SiOx) properties and metal thickness on filter performance.

Main Methods:

  • Fabrication of Metal-SiOx-Metal structures using reaction magnetron sputtering.
  • Deposition of SiOx films with tunable refractive indices (1.97-3.84).
  • Analysis of angle-resolved spectral filtering for both p- and s-polarization light.

Main Results:

  • The proposed filter exhibits angle-insensitive color performance, particularly for p-polarization light, maintaining color over a 0°-60° incidence range.
  • High angular tolerance is achieved due to distinct physical mechanisms for p- and s-polarized light.
  • The study analyzes the impact of SiOx absorption and silver (Ag) thickness on peak transmittance.

Conclusions:

  • The Metal-SiOx-Metal structure offers a viable solution for angle-insensitive color filtering.
  • Tunable SiOx refractive index is key to meeting resonance conditions for angle insensitivity.
  • Further analysis of SiOx absorption and Ag thickness can optimize filter transmittance.