Dynamical studies of low-loss optical phase change materials and applications in nanoscale optical switches

Lawson, Daniel (2024) Dynamical studies of low-loss optical phase change materials and applications in nanoscale optical switches. University of Southampton, Doctoral Thesis, 97pp.

Record type: Thesis (Doctoral)

Abstract

This thesis aims to tackle the challenges in the integration of low-loss phase change materials (PCMs) in silicon photonics, optical memories and metasurfaces. These materials enable reconfigurability by means of their different crystal phases, which possess a drastic changes in their refractive properties. Of particular interest is the material the low-loss phase change material antimony triselenide (Sb2Se3) which posesses extraordinarily low losses in the telecommunication C-band, commonly used in integrated photonic circuitry. Specifically, time-resolved optical switching methods are used toexplore the crystallisation and vitrification dynamics, and to characterise and identify the optimal switching regimes in both crystal-glass transitions and vice versa.

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