With its unique and exclusive linear and nonlinear optical characteristics, epsilon-near-zero
(ENZ) photonics has drawn a tremendous amount of attention in the recent decade in the …

Metamaterials possess exotic properties that do not exist in nature. Gradient metamaterials,
which are characterized by a continuous spatial variation of their properties, provide a …

In this paper, we provide a comprehensive review of unidirectional reflectionless light
propagation in photonic devices at exceptional points (EPs). EPs, which are branch point …

We develop the theory of a special type of scattering state in which a set of asymptotic
channels is chosen as inputs, and the complementary set is chosen as outputs, and there is …

We proposed and demonstrated that PT symmetric metamaterials could be used to achieve
enhanced spin Hall effect (SHE) of light. We find that when laser mode is excited in PT …

Geometrical symmetry plays a significant role in implementing robust, symmetry-protected,
bound states in the continuum (BICs). However, this benefit is only theoretical in many cases …

Optical systems with gain and loss that respect parity-time (PT) symmetry can have real
eigenvalues despite their non-Hermitian character. Chiral systems impose circularly …

Nonreciprocity is important for optical information processing, full-duplex communications,
and protection of sensitive laser equipment from unwanted reflections. However, it is very …

Nonreciprocal transmission forms the basic operation mechanism of optical diodes and
isolators and requires the tantalizing task of breaking the Lorentz reciprocity law. In this …

Goos-Hänchen (GH) effect is a fundamental phenomenon in optics. Here we demonstrate
theoretically that the surface modes at Parity-time (PT) symmetric interfaces, can induce a …