Artificial neural network discovery of a switchable metasurface reflector.
Jonathan Thompson,Joshua A. Burrow,P. J. Shah,Jonathan E. Slagle,Eric S. Harper,A. Van Rynbach,Imad Agha,Matthew S. Mills +7 more
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This paper simulates various metasurface configurations consisting of periodic 1D bars or 2D pillars made of the ternary phase change material Ge2Sb2Te5 (GST) and identifies and validate optimal GST metasURface configurations best suited as dynamic switchable mirrors depending on selected light and manufacturing constraints.Abstract:
Optical materials engineered to dynamically and selectively manipulate electromagnetic waves are essential to the future of modern optical systems. In this paper, we simulate various metasurface configurations consisting of periodic 1D bars or 2D pillars made of the ternary phase change material Ge2Sb2Te5 (GST). Dynamic switching behavior in reflectance is exploited due to a drastic refractive index change between the crystalline and amorphous states of GST. Selectivity in the reflection and transmission spectra is manipulated by tailoring the geometrical parameters of the metasurface. Due to the immense number of possible metasurface configurations, we train deep neural networks capable of exploring all possible designs within the working parameter space. The data requirements, predictive accuracy, and robustness of these neural networks are benchmarked against a ground truth by varying quality and quantity of training data. After ensuring trustworthy neural network advisory, we identify and validate optimal GST metasurface configurations best suited as dynamic switchable mirrors depending on selected light and manufacturing constraints.read more
Citations
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Myths and truths about optical phase change materials: A perspective
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Intelligent metaphotonics empowered by machine learning
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Posted Content
Intelligent metaphotonics empowered by machine learning
TL;DR: In this article, the basic concepts of machine learning with some specific examples developed and demonstrated for metasystems and metasurfaces are presented. And they provide effective tools for the study of the field of metaphotonics driven by optically induced electric and magnetic resonances.
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TL;DR: In this paper , a review of recent advances in tunable metasurfaces in terms of the active materials and tuning mechanisms, design methodologies, and practical applications is presented.
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Endurance of Chalcogenide Optical Phase Change Materials: a Review
Louis Martin-Monier,C. Popescu,Luigi Ranno,Brian Peter Mills,Sarah Geiger,Dennis M. Callahan,M. Moebius,Juejun Hu +7 more
TL;DR: In this article , the authors discuss the various parameters that impact crystallization and re-amorphization of several Chalcogenide phase change materials, their failure mechanisms, and formulate design rules for enhancing cycling durability of these compounds.
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