Power flow-conformal metamirrors for engineering wave reflections

Science Advances
Ana Díaz-RubioSergei A Tretyakov

Abstract

Recently, the complexity behind manipulations of reflected fields by metasurfaces has been addressed, showing that, even in the simplest scenarios, nonlocal response and excitation of auxiliary evanescent fields are required for perfect field control. In this work, we introduce purely local reflective metasurfaces for arbitrary manipulations of the power distribution of reflected waves without excitation of any auxiliary evanescent field. The method is based on the analysis of the power flow distribution and the adaptation of the reflector shape to the desired distribution of incident and reflected fields. As a result, we find that these power-conformal metamirrors can be easily implemented with conventional passive unit cells. The results can be used for the design of reflecting surfaces with multiple functionalities and for waves of different physical nature. In this work, we present the cases of anomalous reflection and beam splitting for both acoustic and electromagnetic waves.

References

Jul 21, 2011·Physical Review Letters·Bogdan-Ioan PopaSteven A Cummer
Nov 30, 2012·Nano Letters·Shulin SunDin Ping Tsai
Aug 30, 2013·Scientific Reports·Yong LiJian-chun Cheng
Jan 24, 2014·Nature Materials·Nanfang Yu, Federico Capasso
Mar 21, 2015·Physical Review Letters·V S AsadchyS A Tretyakov
Aug 27, 2016·Scientific Reports·Kyungjun SongTaesung Kim
Feb 1, 2017·Journal of Neural Engineering·H Isaac ChenDouglas H Smith
Aug 19, 2017·Science Advances·Ana Díaz-RubioSergei A Tretyakov
Sep 28, 2017·Physical Review Letters·Younes Ra'diAndrea Alù

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