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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
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.
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.
