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We propose a route to obtain broadband absorption in the mid-infrared region by coupling plasmon and phonon polaritons in compact hBN/metal metasurface. Here we show, with the assistance of the dispersion relation contours, that hybrid phonon-plasmon polaritons modes can exist in the hBN/metal heterostructures. By exciting these modes, i.e., hyperbolic phonon-plasmon polaritons in the Reststrahlen...
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