Frequency separation of surface acoustic waves in layered structures with acoustic metamaterials |
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| Institution: | 1. Kotelnikov Institute of Radio-Engineering and Electronics of RAS, 11-7 Mokhovaya Street, Moscow 125009, Russia;2. Moscow Institute of Physics and Technology, 9 Instituskij per., Dolgoprudny 141700, Moscow Region, Russia;3. Department of Physics, Oakland University, 2200 N. Squirrel Road, Rochester, MI 48309, USA;4. Department of Physics, Quantum Photonic Science Research Center and RINS, Hanyang University, Seoul 133-791, Republic of Korea;5. Saratov State University, 112 Bol''shaya Kazach’ya, Saratov 410012, Russia;1. EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB, United Kingdom;2. EFDA Close Support Unit Garching, Boltzmannstaße 2, D-85748 Garching bei München, Germany;1. Japan Atomic Energy Agency, Fusion Research and Development Directorate, Naka, Ibaraki-ken 311-0193, Japan;2. ITER Organization, Route de Vinon sur Verdon, 13115 St Paul Lez Durance, France;1. Bond and Band Engineering Group, Sichuan Provincial Key Laboratory (for Universities) of High Pressure Science and Technology, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, Sichuan 610031, People''s Republic of China;2. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, People''s Republic of China;1. MOE Key Laboratory of Laser Life Science and Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China;2. School of Physical Education and Sports Science, South China Normal University, Guangzhou 510006, China |
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| Abstract: | We show theoretically that in elastic layered structures containing an upper layer of smoothly varied thickness and a substrate of a highly dispersive metametarial it is possible to significantly enhance spatial frequency separation of surface acoustic waves. Theory of Love surface acoustic waves propagation in waveguides with varied thickness, taking into account mutual modes coupling, is built. Appropriate structure of metamatererial with resonant frequency dependence of material parameters, making frequency separation effective, is provided. Efficiency of spatial frequency separation and modes coupling is calculated for various metamaterial parameters and wave frequencies. |
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| Keywords: | Surface acoustic waves Elastic metamaterials Splitter Spatial dispersion |
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