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SHIRISH TRIPATHI1,* , RITESH KUMAR MISHRA1
This study presents polarization independent, achiral metasurface using Ge₂Sb₂Te₅ (GST integrated square spiral design on SiO SiO₂ Au substrate for active modulation of toroidal dipole resonances in mid infrared regime. FDTD simulations show strong field confinement with dominant toroidal dipoles in amorphous GST ( AGST), while crystalline (C GST suppresses resonances, enabling dynamic sw itching. Geometrical parameters, branch width, t urn spacing and inter segment gaps, govern spectral tuning and resonance sharpness. Multipolar decomposition confirms toroidal dominance under optimized dimensions. Results establish pathway for tunable, reconfigurable metasurface devices for high Q sensin g, mid infrared modulation , biosensing, and environmental monitoring, supporting GST based phase switchable components in compact, efficient, responsive optoelectronic platforms..
Metasurface, Toroidal resonance, Phase Change Material, Ge ₂ Sb ₂ Te ₅.
SHIRISH TRIPATHI, RITESH KUMAR MISHRA, Phase change based “switch off” enabled toroidal dipole excitation in polarization independent achiral metasurface in mid infrared regime, Optoelectronics and Advanced Materials - Rapid Communications, 20, 5-6, May-June 2026, pp.257-264 (2026).
Submitted at: Dec. 2, 2025
Accepted at: June 2, 2026
Optoelectronics and Advanced Materials - Rapid Communications
(2024): Impact Factor = 0.4 - Journal Citation Reports (Clarivate Analytics, 2025)
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