Crystallization-driven absorption modulation in 1D photonic crystals with nano-defects of GSST phase-change material

Arezou Rashidi and Behzad Nikzad

Journal of Electromagnetic Waves and Applications, 2025, vol. 39, issue 16, 1997-2008

Abstract: The absorption features of a one-dimensional Fabry–Perot photonic crystal, hybridized with nanodefects of Ge2Sb2Se4Te1 (GSST) phase-change-materials (PCM) in mixed (m-GSST) and amorphous (a-GSST) states, are theoretically investigated. GSST, a widely used nonvolatile PCM, exhibits a reversible and stable phase change between amorphous and crystalline states. By analyzing the real and imaginary components of the permittivity of GSST as functions of wavelength and filling fraction, we illustrate the material's dispersive and absorptive behaviors. The results show that increasing the crystallization fraction of m-GSST significantly enhances the permittivity contrast between the PCM defects, leading to substantial absorption peaks and notable redshifts in the peak wavelengths. Additionally, the absorption characteristics under oblique incidence reveal the structure’s sensitivity to both the incident angle and the polarization of light. These findings provide valuable insights for engineering the optical properties of GSST-based systems, paving the way for development of tunable absorptive photonic devices with tailored functionalities.

Date: 2025
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DOI: 10.1080/09205071.2025.2535644

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