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Aperiodic Bragg Reflectors for Tunable High-Purity Structural Color Based on Phase Change Material.

Sambhu Jana1,2, Kandammathe Valiyaveedu Sreekanth3, Omar A M Abdelraouf3

  • 1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore637371.

Nano Letters
|March 20, 2024
PubMed
Summary

This study introduces a novel tunable aperiodic distributed Bragg reflector (A-DBR) using antimony trisulfide (Sb2S3) for high-purity reflective color displays. The A-DBR achieves exceptional color purity by precisely controlling photonic bandgaps.

Keywords:
aperiodic distributed Bragg reflectorscolor filtersphase change materialsthin-film coatings

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Tunable thin-film coatings are crucial for advanced applications like intelligent windows and spatial light modulators.
  • A significant challenge in this field is achieving high-purity colors with reflective displays.
  • Existing nano thin-film coatings often struggle with color purity and require specific irradiance conditions.

Purpose of the Study:

  • To develop a novel thin-film coating capable of generating high-purity colors for reflective displays.
  • To demonstrate the effectiveness of an ultralow-loss phase change material, antimony trisulfide (Sb2S3), in tunable photonic structures.
  • To achieve tunable, narrowband, and highly reflective color bands with exceptional purity.

Main Methods:

  • Fabrication of tunable aperiodic distributed Bragg reflectors (A-DBRs) utilizing Sb2S3 as the phase change material.
  • Strategic adjustment of layer periodicity within the A-DBRs to create narrow photonic bandgaps.
  • Inducing phase transitions in Sb2S3 layers (amorphous to crystalline) to tune the photonic bandgap and color states.
  • Experimental validation of multistate tunable colors via external optical stimuli.

Main Results:

  • Achieved high-purity orange and yellow colors through narrow photonic bandgaps with high reflectivity.
  • Demonstrated significant photonic bandgap tunability by altering the structural phase of Sb2S3.
  • Successfully tailored multistate tunable colors using external optical stimuli.
  • The proposed A-DBR exhibited irradiance-free operation, narrowband reflection, and suppressed off-band reflections, leading to superior color purity.

Conclusions:

  • Ultralow-loss Sb2S3-based A-DBRs offer a promising route to high-purity reflective color generation.
  • The ability to tune color states via phase transitions and external stimuli provides design flexibility for advanced optical devices.
  • This approach overcomes limitations of conventional coatings, enabling efficient and pure color displays for diverse applications.