TY - JOUR
T1 - Complex Refraction Metasurfaces for Locally Enhanced Propagation Through Opaque Media
AU - Perea-Puente, Sinuhé
AU - Rodríguez-Fortuño, Francisco J.
N1 - Funding Information:
S.P.‐P. thanks V. Arribas‐López for the rendering of the 3D graphic implementation, A. Díaz‐Nadales for the helpful suggestion about the Feynman trick and A. Ortega‐Arroyo for the fruitful discussion about the potential applications in Health Sciences. F.J.R.‐F. thanks N. Engheta for useful discussions. This work was supported by the European Research Council Starting Grant ERC‐2016‐STG‐714151‐PSINFONI and EPSRC‐2020‐20004058‐11982 (UK).
Publisher Copyright:
© 2024 The Authors. Laser & Photonics Reviews published by Wiley-VCH GmbH.
PY - 2024/5
Y1 - 2024/5
N2 - Metasurfaces with linear phase gradients can redirect light beams. Controlling both phase and amplitude of a metasurface is proposed to extend Snell's law to the realm of complex angles, enabling a non-decaying transmission through opaque media with complex refractive indices. This leads to the discovery of non-diffracting and non-decaying solutions to the wave equation in opaque media, in the form of generalized cosine and Bessel-beams with a complex argument. While these solutions present nonphysical exponentially growing side tails, this is addressed via a windowing process, removing the side tails of the field profile while preserving significant transmission enhancement through an opaque slab on a small localized region. Such refined beam profiles may be synthesized by passive metasurfaces with phase and amplitude control at the opaque material's interface. The findings, derived from rigorous solutions of the wave equation, promise new insights and enhanced control of light propagation in opaque media.
AB - Metasurfaces with linear phase gradients can redirect light beams. Controlling both phase and amplitude of a metasurface is proposed to extend Snell's law to the realm of complex angles, enabling a non-decaying transmission through opaque media with complex refractive indices. This leads to the discovery of non-diffracting and non-decaying solutions to the wave equation in opaque media, in the form of generalized cosine and Bessel-beams with a complex argument. While these solutions present nonphysical exponentially growing side tails, this is addressed via a windowing process, removing the side tails of the field profile while preserving significant transmission enhancement through an opaque slab on a small localized region. Such refined beam profiles may be synthesized by passive metasurfaces with phase and amplitude control at the opaque material's interface. The findings, derived from rigorous solutions of the wave equation, promise new insights and enhanced control of light propagation in opaque media.
KW - bullseye metasurface
KW - complex angle
KW - complex Bessel beam
KW - Generalized Snell Law
UR - http://www.scopus.com/inward/record.url?scp=85182426039&partnerID=8YFLogxK
U2 - 10.1002/lpor.202300867
DO - 10.1002/lpor.202300867
M3 - Article
AN - SCOPUS:85182426039
SN - 1863-8880
VL - 18
JO - Laser and Photonics Reviews
JF - Laser and Photonics Reviews
IS - 5
M1 - 2300867
ER -