This talk is focused on new material and device platforms for realization of reconfigurable metaphotonic devices using materials with a large variation of their optical properties through phase transformation. Volatile and nonvolatile phase-change materials as well as polymer-based materials will be covered. Design, fabrication, and application of this platform for state-of-the-art devices and systems will also be discussed.
Abstract:
Our study presents an innovative approach to metasurface design, marrying Fourier techniques from image processing with artificial intelligence (AI). Metasurfaces, vital in compact optical system creation, have been a focus. Conventional topological optimization methods show promise but face challenges in computational efficiency, especially with large-scale devices. AI-driven techniques, though effective, are often limited to devices with few design parameters. Our proposed methodology addresses these issues, offering a robust design framework for expansive metasurfaces. We interpret unit cell dimensions as Fourier series coefficients, simplifying design complexities and addressing periodicity concerns. By utilizing AI on the captured Fourier series coefficients, we drastically reduce design parameters, facilitating specialized AI metasurface applications. This fusion of Fourier and AI methodologies promises breakthroughs in metasurface design, enriching optical engineering possibilities.
In this study, we introduce a novel metaphotonic structure using phase-change materials for efficient beam steering through linearly variable refractive index manipulation. Leveraging the unique properties of Sb2Se3, a versatile phase change material, we create a metasurface capable of precisely controlling light propagation. By inducing a linear phase variation in the incident light, our metasurface effectively deflects light in the desired direction, following the principles of the generalized Snell's law. Simulation results demonstrate the development of a highly efficient beam steerer, achieving an impressive redirection range of approximately 10 degrees with an exceptional efficiency exceeding 80% in one material phase. In the other phase, where material loss impacts efficiency, we still achieve rates exceeding 40%. These remarkable levels of efficiency highlight the potential of phase change materials in photonic applications and position our metastructure as a promising candidate for advanced photonic devices and systems, offering precise and efficient beam steering capabilities.
We present the design and characterization of a novel metasurface absorber utilizing the phase change material, vanadium dioxide (VO2). The absorber demonstrates ultra-wideband performance, exhibiting high absorption across a broad spectrum ranging from 400 nm to 1200 nm. In addition to its spectral versatility, the absorber is designed to function effectively over a wide range of incident angles, maintaining an average absorption of approximately 80% for angles between 0 and 65 degrees. A unique feature of this absorber is its reconfigurability in the infrared regime, particularly in the 1400-1600 nm range. This capability opens up new avenues for dynamic control and optimization of absorption properties in various applications.
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