研究目的
To demonstrate that wide bandgap phase change materials with a tuneable absorption edge are highly suitable for active visible photonics.
研究成果
Sb2S3, with its wide bandgap and tuneable absorption edge, is superior for visible photonics compared to conventional phase change materials like Ge2Sb2Te5. Its fast switching, large optical bandgap, and tuneable refractive index make it versatile for tuneable photonics at visible frequencies. The study suggests that Sb2S3 will lead to innovative photonic devices due to its programmability and flexibility.
研究不足
The study focuses on Sb2S3 as a phase change material for visible photonics, but the cycle endurance of Sb2S3 has not been measured. The relatively large density change upon crystallization may produce mechanical stresses on surrounding materials, which must be considered for high cycleability devices.
1：Experimental Design and Method Selection:
The study exploits the tuneable bandgap of Sb2S3, a phase change material, to actively tune photonic devices in the visible spectrum. The methodology involves coupling Sb2S3 to an optical resonator to observe its response to structural phase transitions.
2：Sample Selection and Data Sources:
Sb2S3 films were deposited on substrates by RF sputtering. The optical properties of Sb2S3 in amorphous and crystalline states were measured using ellipsometry.
3：List of Experimental Equipment and Materials:
Equipment includes a DC sputtering system for aluminium films, RF sputtering for Si3N4 and Sb2S3, an ellipsometry spectrometer (WVASE, J.A Woollam Co.), and a pump–probe nanosecond laser system for switching measurements.
4：Experimental Procedures and Operational Workflow:
The fabrication involved depositing aluminium and Sb2S3 films, followed by crystallization at 573 K. Optical bandgap measurements were conducted using Tauc analysis. Laser and electrical switching were demonstrated to show reversible phase transitions.
5：Data Analysis Methods:
The optical constants were fitted by Lorentz and Tauc–Lorentz oscillator models. Reflectance spectra were normalized to an Al mirror, and absorptance maximum wavelengths were obtained by Gaussian fitting.
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