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Recently, chalcogenide glass based phase change materials (PCMs) have shownutility as a tuning material for a range of nanophotonic devices. Owing totheir low loss, ultrafast switching speeds and wide waveband operation, PCMsare integrated in an increasing number of next generation tunable components,including integrated photonic switches, metasurface optics and tunable spectralfilters. Nonetheless, modelling of PCM-based devices is challenging, both interms of accurate representation of experimentally-derived material propertiesin different phase states, and standardization of results across the researchcommunity. In this work, we introduce PCMnet, an online database of the complexrefractive indices of a variety of chalcogenide glass PCMs (such as GeSbTe), asan accessible and indexed repository for data sharing across the PCM community.Refractive indices (n) and extinction coefficients (k) between amorphous andcrystalline states are directly extracted from experimentally-derived data innumerous academic research articles, and collated into the material resourcedatabase. Due to the inaccuracies associated with our data collection methods,this data is supplemented with additional computationally-generated data,obtained through WVASE, a commercial ellipsometry analysis software package. Todemonstrate the utility of PCMnet, we provide a NASA application-driven deviceoptimization example using the optical properties of PCMs collected with ourdatabase. We anticipate the database providing great use to the PCM communityand coordinated research efforts enabled by PCMnet will promote the sharedrepository for the selection of appropriate PCMs for tunable nanophotonicdevice design for a range of applications.

PCM-net: A refractive index database of chalcogenide phase change materials for tunable nanophotonic device modelling