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Electrically Tunable Steganographic Nano-Optical Coatings.

Patinharekandy Prabhathan1,2, Kandammathe Valiyaveedu Sreekanth3, Jinghua Teng3

  • 1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.

Nano Letters
|May 18, 2023
PubMed
Summary

We developed novel nano-optical coatings using phase change materials (PCMs) for tunable colors. These coatings enable dynamic color tuning for applications in optical steganography and reflective displays.

Keywords:
Color filtersFano resonanceOptical steganographyPhase change materialsThin film coatings

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Tunable thin film coatings are essential for advanced applications like reflective displays and steganography.
  • Phase change materials (PCMs) offer dynamic optical properties crucial for color manipulation.

Purpose of the Study:

  • To propose and demonstrate a novel steganographic nano-optical coating (SNOC) using chalcogenide PCMs.
  • To achieve tunable optical Fano resonance for full-color reflection and steganography.

Main Methods:

  • Incorporating broadband and narrowband absorbers made of PCMs into SNOC design.
  • Utilizing the amorphous-to-crystalline phase transition of PCMs to tune Fano resonance linewidth.
  • Designing a cavity layer with ultralow loss PCM and high-index dielectric for steganography.

Main Results:

  • Demonstrated tunable optical Fano resonance in the visible spectrum for a full-color range.
  • Achieved dynamic tuning of Fano resonance linewidth by switching PCM structural phases, enabling high-purity colors.
  • Fabricated electrically tunable color pixels using SNOC on a microheater device.

Conclusions:

  • SNOC provides a scalable platform for tunable color reflectors.
  • The dynamic phase switching of PCMs is key to high-purity, tunable colors.
  • SNOC technology is promising for optical steganography and micro-display applications.