An expression for the transmitted fraction of the uniform and parallel radiation incident upon the coupler between two rectangular light pipes of different physical dimensions is derived. It is a function of the pipe dimension ratio and the angle of the incident radiation. It is shown that for radiation nearly parallel to the pipe axis, it is possible to design a coupler for any pipe dimension ...

An infrared perfect absorber based on a gold nanowire metamaterial cavities array on a gold ground plane is designed. The metamaterial made of gold nanowires embedded in an alumina host exhibits an effective permittivity with strong anisotropy, which supports cavity resonant modes of both electric dipole and magnetic dipole. The impedance of the cavity modes matches the incident plane wave in f...

A synthesis design method based on a vibrating search algorithm was proposed to achieve a wide-angle incidence visible antireflection coating design with an incident angle up to 50 above normal using only a two-material multilayer system. We found not only that the search algorithm is straightforward, but also that the resultant wide-angle wideband visible antireflection performance in the desi...

Re ective di raction gratings are investigated for use as infrared lters in submillimeter-wave cryogenic receivers, to reduce radiative loading via the dewar window on the 4K stage. The grating di racts incident IR away from the signal path, back toward the window. Analysis using scalar approximations indicate a single grating lter blocks close to 98% of the incident IR at 300K along the RF sig...

We propose multilayer cylindrical invisibility cloaks that are optimized for oblique incidences through a combination of analytic formalism of scattering and genetic optimization. We show that by using only four layers of homogeneous and anisotropic metamaterials without large values of constitutive parameters, the scattering for oblique incidences can be reduced by 2 orders. Although the optim...

The ability to simulate the surface energy balance and microclimate within a plant canopy is contingent upon accurate simulation of radiation exchange within the canopy. Accurate radiation simulations require some assumption of leaf angle distribution to compute transmissivity, reflection and scattering of radiation. The ellipsoidal leaf angle density function can very closely approximate real ...

Dispersion Engineering The cover artwork depicts infrared light incident on a surface at different angles, which is absorbed. Correspondingly, directional thermal emission occurs with conical profile the same angle incident. image essentially captures tunability of emission, particularly its (angular) profile, forms major part results presented in article number 2100153 by Ben Johns, Shashwata ...

It has recently been shown that the structured surface of a perfect conductor can support surface-plasmon-like modes [Pendry, Science 305, 847 (2004)10.1126/science.1098999]. Such structures have a thickness of at least the order of the wavelength. Here, using microwave wavelength radiation incident beyond the critical angle of a wax prism, we quantify the surface-plasmon-like dispersion for a ...

A broadband and broad-angle low-scattering metasurface is designed, fabricated, and characterized. Based on the optimization algorithm and far-field scattering pattern analysis, we propose a rapid and efficient method to design metasurfaces, which avoids the large amount of time-consuming electromagnetic simulations. Full-wave simulation and measurement results show that the proposed metasurfac...