PCM-net: A refractive index database of chalcogenide phase change\n materials for tunable nanophotonic device modelling Article Swipe
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· 2020
· Open Access
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· DOI: https://doi.org/10.48550/arxiv.2012.14445
· OA: W4287547853
Recently, chalcogenide glass based phase change materials (PCMs) have shown\nutility as a tuning material for a range of nanophotonic devices. Owing to\ntheir low loss, ultrafast switching speeds and wide waveband operation, PCMs\nare integrated in an increasing number of next generation tunable components,\nincluding integrated photonic switches, metasurface optics and tunable spectral\nfilters. Nonetheless, modelling of PCM-based devices is challenging, both in\nterms of accurate representation of experimentally-derived material properties\nin different phase states, and standardization of results across the research\ncommunity. In this work, we introduce PCMnet, an online database of the complex\nrefractive indices of a variety of chalcogenide glass PCMs (such as GeSbTe), as\nan accessible and indexed repository for data sharing across the PCM community.\nRefractive indices (n) and extinction coefficients (k) between amorphous and\ncrystalline states are directly extracted from experimentally-derived data in\nnumerous academic research articles, and collated into the material resource\ndatabase. Due to the inaccuracies associated with our data collection methods,\nthis data is supplemented with additional computationally-generated data,\nobtained through WVASE, a commercial ellipsometry analysis software package. To\ndemonstrate the utility of PCMnet, we provide a NASA application-driven device\noptimization example using the optical properties of PCMs collected with our\ndatabase. We anticipate the database providing great use to the PCM community\nand coordinated research efforts enabled by PCMnet will promote the shared\nrepository for the selection of appropriate PCMs for tunable nanophotonic\ndevice design for a range of applications.\n
