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28 April 2017 Non-reciprocal wave propagation in zero-index materials (Conference Presentation)
Andrea Alù, Dimitrios Sounas, Li Quan
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Proceedings Volume 10112, Photonic and Phononic Properties of Engineered Nanostructures VII; 1011207 (2017) https://doi.org/10.1117/12.2257797
Event: SPIE OPTO, 2017, San Francisco, California, United States
Abstract
Moving media have recently attracted attention for their ability to break reciprocity without magnetic materials. By spinning air in an acoustic cavity, it was recently shown that it is possible to realize an acoustic circulator [R. Fleury, D. Sounas, A. Alù, Science 343, 516 (2014)], with applications for sonars and medical imaging devices. Similarly, by effectively imparting angular momentum to microwave and optical resonators through spatiotemporal modulation, it is possible to induce strong non-reciprocity, with groundbreaking applications in the design of full-duplex communication systems [N. Estep, D. Sounas, J. Soric, A. Alù, Nature Physics 10, 923 (2014)]. Here we show that the non-relativistic Fresnel-Fizeau effect at the basis of these mechanisms can be boosted in epsilon-near-zero (ENZ) media, due to their small intrinsic refractive index. This is a different scenario than resonant structures, where the Fresnel-Fizeau effect is boosted by the effectively large wave-matter interaction distance, even for large intrinsic refractive index for the moving medium. Our results open a new venue to use zero-index metamaterials, and can become practically important in the realization of non-reciprocal imaging systems with built-in isolation and protection from reflections.
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Andrea Alù, Dimitrios Sounas, and Li Quan "Non-reciprocal wave propagation in zero-index materials (Conference Presentation)", Proc. SPIE 10112, Photonic and Phononic Properties of Engineered Nanostructures VII, 1011207 (28 April 2017); https://doi.org/10.1117/12.2257797
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KEYWORDS
Acoustics
Refractive index
Wave propagation
Imaging devices
Magnetism
Medical devices
Medical imaging
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