Mechanical rainbow trapping and Bloch oscillations in chirped metallic beams
| Autor: | Gabriela Baez, Francisco Cervera, Arturo Arreola-Lucas, Alfonso Climente, R. A. Méndez-Sánchez, José Sánchez-Dehesa |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Physics Acoustics and Ultrasonics Doppler spectroscopy Transfer-matrix method (optics) Rainbow 02 engineering and technology Trapping 021001 nanoscience & nanotechnology 01 natural sciences Intensity (physics) Arts and Humanities (miscellaneous) 0103 physical sciences Chirp Bloch oscillations Physics::Atomic Physics Center frequency Atomic physics 0210 nano-technology |
| Zdroj: | The Journal of the Acoustical Society of America. 141:3810-3810 |
| ISSN: | 0001-4966 |
| DOI: | 10.1121/1.4988421 |
| Popis: | The mechanical rainbow trapping effect and the mechanical Bloch oscillations for torsional waves propagating in chirped mechanical structures are here experimentally demonstrated. After extensive simulations, three quasi-one-dimensional chirped structures were designed, constructed and experimentally characterized by Doppler spectroscopy. When the chirp intensity vanishes, a perfect periodic system, with bands and gaps, is obtained. The mechanical rainbow trapping effect is experimentally characterized for small values of the chirp intensity. The wave packet traveling along the structure is progressively slowing down and is reflected back at a certain depth, which depends on its central frequency. For larger values of the chirping parameter the rainbow trapping yields the penetration length where the mechanical Bloch oscillations emerge. Numerical simulations based on the transfer matrix method show an excellent agreement with experimental data. |
| Databáze: | OpenAIRE |
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