Breaking the imaging symmetry in negative refraction lenses.

Parity-time symmetric nonlocal metasurfaces: Focusing and imaging through balanced loss and gain

Light focusing and imaging represent some of the oldest applications of optics. Despite centuries of developments, however, conventional optical systems still suffer from aberrations of different types and are limited to plane-to-plane imaging, issues that are inherent to the conventional laws of reflection and refraction [1]. Metamaterials and metasurfaces have offered a route to partially ove...

Manipulating one-way space wave and its refraction by time-reversal and parity symmetry breaking

One-way transmission and negative refraction are the exotic wave properties founded in photonic crystals which attract a great attention due to their promising applications in photonic devices. How to integrate such two phenomena in one material or device is interesting and valuable. In this work, we theoretically and experimentally demonstrate that one-way electromagnetic space wave can be rea...

ABCD matrix for reflection and refraction of laser beam at tilted concave and convex elliptic paraboloid interfaces and studying laser beam reflection from a tilted concave parabola of revolution

Studying Gaussian beam is a method to investigate laser beam propagation and ABCD matrix is a fast and simple method to simulate Gaussian beam propagation in different mediums. Of the ABCD matrices studied so far, reflection and refraction matrices at various surfaces have attracted a lot of researches. However in previous work the incident beam and the principle axis of surface are in parallel...

Symmetry breaking and (pseudo)spin polarization in Veselago lenses for massless Dirac fermions

Refraction at the Interface of a Lossy Metamaterial

The refraction phenomenon at the interface of an ordinary material and a lossy metamaterial has been investigated. For oblique incidence on the lossy metamaterial, the planes of constant amplitude of the refracted wave are parallel to the interface and the plane of constant phases make a real angle with the interface (real refraction angle). The real refraction angle and hence, the real refract...