In this paper we give a review on normally hyperbolic operators of Huygens type. The methods to determine Huygens operators we explain here were essentially innuenced and developed by Paul G unther.

We studied a metasurface constituted as a periodic array of semiconductor split-ring resonators. The resonance frequencies of the metasurface excited by normally incident light were found to be continuously tunable in the terahertz regime through an external magnetostatic field of suitable orientation. As such metasurfaces can be assembled into 3D metamaterials, the foregoing conclusion also ap...

Ultrathin metasurface compromising various sub-wavelength meta-particles offers promising advantages in controlling electromagnetic wave by spatially manipulating the wavefront characteristics across the interface. The recently proposed digital coding metasurface could even simplify the design and optimization procedures due to the digitalization of the meta-particle geometry. However, current ...

We have modeled, fabricated, and characterized a plasmonic metasurface with subwavelength features, whose dominant resonance is the independent of incident angle and polarization, and sensitive only to the material composition and geometry of a single element. Higher-order resonances, associated with surface plasmon polariton (SPP) coupling and higher diffraction orders, are sensitive to the in...

Our experiment shows that the thermal emission of phonon can be controlled by magnetic resonance (MR) mode in a metasurface (MTS). Through changing the structural parameter of metasurface, the MR wavelength can be tuned to the phonon resonance wavelength. This introduces a strong coupling between phonon and MR, which results in an anticrossing phonon-plasmons mode. In the process, we can manipu...

Over the past decades, many radome designs to extend angular scan range of phased-array antennas have been devised by utilizing dielectric materials and metamaterials. More recently, metasurface technology such as planar lenses beam deflectors applied phased arrays, enabling scan-angle enhancers a low profile. In this work, physical Huygens’ (HMS) two-lens system for doubling array is presented...

Abstract Metalenses exhibit a substantial potential in replacing traditional optical component as they present methodology for miniaturization. Lenses with tunable focal lengths can play key role various fields applications imaging, displays, and augmented virtual reality devices. Here, we propose an electrically controllable varifocal metalens at the wavelength of 950 nm. The metasurface casca...

C. Huygens’ observation of the antiphase synchronization of two pendulum clocks mounted together on the same beam [Huygens, C., 1665] was one of the first observations of the phenomenon of the coupled harmonic oscillators, which stimulated a great number of studies of the systems which can synchronize [Pikovsky, A., et al., 2001; Blekham, I.I., 1988]. Recently, Huygens’ original experiment has ...

Complex-amplitude holographic metasurfaces (CAHMs) with the flexibility in modulating phase and amplitude profiles have been used to manipulate propagation of wavefront an unprecedented level, leading higher image-reconstruction quality compared their natural counterparts. However, prevailing design methods CAHMs are based on Huygens-Fresnel theory, meta-atom optimization, numerical simulation ...

The engineering of metasurfaces for antenna and sensing applications is investigated. The metasurfaces composed of LC-resonant cells, are designed to achieve either modulated phase or high quality factor resonances. While the phase modulated metasurface applied as a superstrate in a Fabry-Perot cavity antenna, shows the capability to steer the radiated beam to an off-normal radiation, the high ...