Here, we thus design a general non-Hermitian metasurface with a unit cell containing two orthogonally oriented split-ring resonators (SRRs) with overlapping resonance but different scattering rates and radiation efficiencies. Such a design grants us full access to the parameter space around the EP. ...
Non-Hermitian theory is a theoretical framework used to describe open systems. It offers a powerful tool in the characterization of both the intrinsic degrees of freedom of a system and the interactions with the external environment. The non-Hermitian framework consists of mathematical structures that...
et al. Manifestation of PT symmetry breaking in polarization space with terahertz metasurfaces. Phys. Rev. Lett. 113, 093901 (2014). Article ADS Google Scholar Xu, Y.-L. et al. Experimental realization of Bloch oscillations in a parity–time synthetic silicon photonic lattice. Nat. Commun....
et al. Manifestation of PT symmetry breaking in polarization space with terahertz metasurfaces. Phys. Rev. Lett. 113, 093901 (2014). Article ADS Google Scholar Xu, Y.-L. et al. Experimental realization of Bloch oscillations in a parity–time synthetic silicon photonic lattice. Nat. Commun....
Inspired by the concept of parity-time (PT) symmetry in quantum physics, researchers are paying increasing attention to non-Hermitian scenarios, characterized by spatially modulated distributions of loss and gain, in optics and photonics. A complex-coordinate extension of the transformation-optics framew...
Twins of Exceptional Points with Opposite Chirality for Non-Hermitian Metasurfaces Exceptional points (EPs) in non-Hermitian systems have recently emerged as an intriguing way to manipulate certain physical processes interacting with the ... Xiangrong Wu,Xiaofang Zhao,Yihe Lin,... - 《Acs Photonics...
(a) Non-Hermitian metasurface geometry [202]. (b) Non-Hermitian control of light propagation in a topological microring lattice. Topological edge states can be dynamically reconfigured to steer light along any boundaries defined by the arbitrarily patterned pump beam [203]. (c) Experimental scheme...
We present here an ultrasensitive optical sensing technique based on the parity-time (PT)-symmetric non-Hermitian metasurfaces. The system is composed of a pair of active and passive metasurfaces with the subtle gain-loss balance. Specifically, these two metasurfaces are made of the photoexcited,...
In this article, we review the recent advances in exceptional-point and non-Hermitian metasurfaces. We introduce the basic theory of exceptional point and non-Hermiticity in metasurfaces, highlight important achievements and applications, and discuss the future opportunities of non-Hermitian metasurface...
non-Hermitian metasurfacesWe proposed and designed a non-Hermitian metasurface mirror consisting of two-layers acoustic labyrinthine metamaterials with a full phase control and inherent loss. It yields strongly asymmetric acoustic retroflection (>35 dB) for two opposite incident angles: free retro...