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Proceedings Paper

Non-reciprocal wave propagation in zero-index materials (Conference Presentation)
Author(s): Andrea Alù; Dimitrios Sounas; Li Quan

Paper 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.

Paper Details

Date Published: 28 April 2017
PDF: 1 pages
Proc. SPIE 10112, Photonic and Phononic Properties of Engineered Nanostructures VII, 1011207 (28 April 2017); doi: 10.1117/12.2257797
Show Author Affiliations
Andrea Alù, The Univ. of Texas at Austin (United States)
Dimitrios Sounas, The Univ. of Texas at Austin (United States)
Li Quan, The Univ. of Texas at Austin (United States)

Published in SPIE Proceedings Vol. 10112:
Photonic and Phononic Properties of Engineered Nanostructures VII
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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