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Sci Rep. 2014 Aug 29;4:6228. doi: 10.1038/srep06228.

Non-reciprocal geometric wave diode by engineering asymmetric shapes of nonlinear materials.

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Center for Phononics and Thermal Energy Science, School of Physics Science and Engineering, Tongji University, 200092 Shanghai, P. R. China.
1] Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA [2] Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.


Unidirectional nonreciprocal transport is at the heart of many fundamental problems and applications in both science and technology. Here we study the novel design of wave diode devices by engineering asymmetric shapes of nonlinear materials to realize the function of non-reciprocal wave propagations. We first show analytical results revealing that both nonlinearity and asymmetry are necessary to induce such non-reciprocal (asymmetric) wave propagations. Detailed numerical simulations are further performed for a more realistic geometric wave diode model with typical asymmetric shape, where good non-reciprocal wave diode effect is demonstrated. Finally, we discuss the scalability of geometric wave diodes. The results open a flexible way for designing wave diodes efficiently simply through shape engineering of nonlinear materials, which may find broad implications in controlling energy, mass and information transports.

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