The strange case of negative reflection
Meirbekova B. Morini L. Brun M. Carta G.
17 July 2023American Institute of Physics Inc.
Applied Physics Letters
2023#123Issue 3
In this paper, we show the phenomenon of negative reflection occurring in a mechanical phononic structure, consisting of a grating of fixed inclusions embedded in a linear elastic matrix. The negative reflection is not due to the introduction of a subwavelength metastructure or materials with negative mechanical properties. Numerical analyses for out-of-plane shear waves demonstrate that there exist frequencies at which most of the incident energy is reflected at negative angles. The effect is symmetric with respect to a line that is not parallel to the normal direction to the grating structure. Simulations at different angles of incidence and computations of the energy fluxes show that negative reflection is achievable in a wide range of loading conditions.
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Institute of Mathematics and Mathematical Modelling MES RK, Pushkin Street 125, Almaty, 050010, Kazakhstan
Department of Computer Engineering, Astana IT University, Mangilik El avenue 55/11, Astana, 010000, Kazakhstan
School of Engineering, Cardiff University, The Parade, Cardiff, CF24 3AA, United Kingdom
Department of Mechanical, Chemical and Materials Engineering, University of Cagliari, Via Marengo 2, Cagliari, 09123, Italy
Institute of Mathematics and Mathematical Modelling MES RK
Department of Computer Engineering
School of Engineering
Department of Mechanical
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