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Engineering multimodal spectrum of Cayley tree fractal meta-resonator supercells for ultrabroadband terahertz light absorption by Amna Zubair; Muhammad Zubair; Aaron Danner; Muhammad Qasim Mehmood is a Engineering article available to read on EtoBox.

What is Engineering multimodal spectrum of Cayley tree fractal meta-resonator supercells for ultrabroadband terahertz light absorption about?

Self-similar fractals provide a degree of freedom for varying the resonance frequency due to the multiscale geometric features involved and are an ideal candidate for ultrabroadband absorbing devices -especially in the terahertz (THz) band where there is a lack of natural absorbing materials. Metasurface-based THz absorbers often suffer from poor broadband performance, whereas strongly absorbing broadband devices are typically complex multilayer structures. Here, we numerically demonstrate an ultrabroadband, ultrathin, polarization-insensitive, wideangle, single-layer planar metasurface THz absorber by integrating different Cayley tree fractal resonators into one supercell based on the frequency shifting and multiresonance bands of different fractal orders. In terms of physics, we have exploited the self-similar nature of fractal geometry to engineer the multimodal spectrum of this system. With increasing fractal order N, an increasing number of modes can be excited with certain degeneracies where each mode corresponds to plasmon oscillations at different geometric scales inside fractal. As a result, broad, multipeaked spectra with large degeneracy numbers can be achieved with larg

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Author

Amna Zubair; Muhammad Zubair; Aaron Danner; Muhammad Qasim Mehmood

Publisher

Walter de Gruyter GmbH

Published

2020

Language

EN

Field

Engineering (Physical Sciences)