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All-Dielectric Color Filter with Ultra-Narrowed Linewidth
Kai Xu1, Yanlong Meng1,2, Shufen Chen2
1College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China.
Micromachines
|March 6, 2021
Summary
This study introduces an ultra-narrow transmissive color filter using GaP/SiO2 and ZnS/SiO2 pairs. The novel design achieves a 2.35 nm linewidth with 75% transmission efficiency, offering a cost-effective solution.
Area of Science:
- Photonics and optical engineering
- Materials science for optical applications
- Nanophotonics and metamaterials
Background:
- Transmissive color filters are crucial optical components.
- Achieving ultra-narrow spectral linewidths and high transmission efficiency simultaneously is challenging.
- Existing filters often compromise on linewidth or efficiency.
Purpose of the Study:
- To propose and investigate a novel transmissive color filter with an ultra-narrow full width at half maximum (FWHM).
- To enhance the quality factor and spectral purity of transmissive filters.
- To provide a feasible and cost-effective method for fabricating narrow-linewidth filters.
Main Methods:
- Utilizing materials with high refractive index and low extinction coefficient.
- Employing a symmetrical Fabry-Pérot cavity with a Distributed Bragg Reflector (DBR) composed of GaP/SiO2 pairs.
- Incorporating a ZnS/SiO2 band-pass filter to improve spectral purity.
- Tuning the SiO2 interlayer thickness to control the spectral characteristics.
Main Results:
- Demonstrated an ultra-narrow FWHM of the transmissive spectrum, reaching 2.35 nm.
- Achieved high transmissive efficiency across the visible spectrum, up to 0.75 (75%).
- Successfully tuned the spectral characteristics by adjusting the SiO2 interlayer thickness.
Conclusions:
- The proposed transmissive color filter design enables ultra-narrow spectral linewidths and high efficiency.
- The use of specific material combinations and cavity structures is effective for filter optimization.
- This research presents a practical and economical approach for advanced optical filter realization.
