Broadband-tunable multispectral imaging using phase-change-based linear variable filters

doi:10.1016/j.optlaseng.2025.109485

Broadband-tunable multispectral imaging using phase-change-based linear variable filters

2025-11-24

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Sandeep Kumar Chamoli *

DOI：10.1016/j.optlaseng.2025.109485

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• Demonstrates a broadband linear variable filter based on phase-change material Sb₂S₃, where controlled thickness variation and phase transition enable extended linear filtering range across the visible–NIR spectrum. • Utilizes the reversible amorphous–crystalline transition of Sb₂S₃ to achieve strong refractive index contrast, enhancing tunability under high irradiance while maintaining angular insensitivity. • Incorporates a deep neural network surrogate model to rapidly and accurately predict full transmission spectra from structural parameters, reducing computation time compared to conventional electromagnetic solvers. • The compact, CMOS-compatible design offers broad applicability in next-generation multispectral imaging, adaptive optics, and high-speed tunable photonic systems.

Broadband-tunable multispectral imaging using phase-change-based linear variable filters

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