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Subwavelength focusing by engineered power-flow conformal metamirrors

Taghvaee, Hamidreza; Liu, Fu; Díaz-Rubio, Ana; Tretyakov, Sergei


Hamidreza Taghvaee

Fu Liu

Ana Díaz-Rubio

Sergei Tretyakov


Many advances in reflective metasurfaces have been made during the last few years, implementing efficient manipulations of wave fronts, especially for plane waves. Despite numerous solutions that have been developed throughout the years, a practical method to obtain subwavelength focusing without the generation of additional undesired scattering is a challenge to this day. In this paper, we introduce and discuss lossless reflectors for focusing incident waves into a point. The solution is based on the so-called power-flow conformal surfaces that allow theoretically arbitrary shaping of reflected waves. The metamirror shape is adapted to the power flow of the sum of the incident and reflected waves, allowing a local description of the reflector surface based on the surface impedance. In particular, we present a study of two scenarios. First, we study the scenario when the field is emitted by a point source and focused at an image point (in the considered example, with the λ/20 resolution). Second, we analyze a metasurface capable of focusing the power of an illuminating plane wave. This work provides a feasible strategy for various applications, including detecting biological signals near the skin, sensitive power focusing for cancer therapy, and point-to-point power transfer.


Taghvaee, H., Liu, F., Díaz-Rubio, A., & Tretyakov, S. (2021). Subwavelength focusing by engineered power-flow conformal metamirrors. Physical Review B, 104(23),

Journal Article Type Article
Acceptance Date Nov 23, 2021
Online Publication Date Dec 8, 2021
Publication Date Dec 15, 2021
Deposit Date Jan 24, 2023
Journal Physical Review B
Print ISSN 2469-9950
Electronic ISSN 2469-9969
Publisher American Physical Society (APS)
Peer Reviewed Peer Reviewed
Volume 104
Issue 23
Public URL

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