Effective index approximation based analytical modeling and two dimensional numerical investigation of surface and bulk sensitivity in optimized hybrid nanostructured plasmonic gratings with miniaturized footprints

Qayoom, Taban; Najeeb-ud-din, Hakim

doi:10.1007/s11082-023-04592-4

Cited by 3 publications

(1 citation statement)

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“…The effective refractive index (n eff ) was calculated for the HE 11 and TE 01 modes, which have the lowest cutoff frequencies. A minimum Au thickness of 20 nm is required considering the electromagnetic field penetration depth, while a thickness of 100 nm is chosen to facilitate efficient heat transfer during the switching process involving the phase transition of the GST layer 43,44 . The 1200 nm gap thickness has a negligible effect on n eff but enables heat confinement for phase change 43 .…”

Section: The Optimal Thickness Of the Different Layersmentioning

confidence: 99%

Multiphysics simulations of a cylindrical waveguide optical switch using phase change materials on silicon

Malek Mohammad,

Nikoufard,

Abdolghaderi

2024

Sci Rep

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This work presents the design and multiphysics simulation of a cylindrical waveguide-based optical switch using germanium-antimony-tellurium (GST) as an active phase change material. The innovative cylindrical architecture is theoretically analyzed and evaluated at 1550 nm wavelength for telecommunication applications. The dispersion relation is derived analytically for the first time to model the optical switch, while finite element method (FEM) and finite difference time domain (FDTD) techniques are utilized to simulate the optical modes, light propagation, and phase change dynamics. The fundamental TE01 and HE11 modes are studied in detail, enabling switching between low-loss amorphous and high-loss crystalline GST phases. Increasing the GST thickness is found to increase absorption loss in the crystalline state but also slows down phase transition kinetics, reducing switching speeds. A 10 nm GST layer results in competitive performance metrics of 0.79 dB insertion loss, 13.47 dB extinction ratio, 30 nJ average power consumption, and 3.5 Mb/s bit rate. The combined optical, thermal, and electrical simulation provides comprehensive insights towards developing integrated non-volatile photonic switches and modulators utilizing phase change materials.

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Section: The Optimal Thickness Of the Different Layersmentioning

confidence: 99%