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As a new degree of freedom for optical manipulation, recently, spatiotemporal optical vortices (STOVs) carrying transverse orbital angular momentums have been experimentally demonstrated with pulse shapers. Here, a spatiotemporal differentiator is proposed to generate STOVs with transverse orbital angular momentum. In order to create phase singularity in the spatiotemporal domain, the spatiotemporal...
We develop the coupled-mode theory for resonant apertures. We show that the maximum transmission and absorption cross sections for resonant apertures are only related to the wavelength and the directivity of the aperture's radiation pattern.
We demonstrate numerically the ability to design a phase front using an array of metallic pillars. We show that in such structures, the local phase delay upon transmission can be tuned by local geometry.
We present a temporal coupled-mode theory for the Fano resonance in light scattering by individual obstacle. As an application, we design a structure that exhibits strong absorption and weak scattering properties at the same frequency.
The invisibility of cylindrical cloaks produced by arbitrary radially coordinate transformations is confirmed. The influence of a tiny geometrical perturbation at the inner boundary of the cloak is investigated. It is shown that a tiny perturbation would induce a noticeable field scattering, due to the slow convergence of the zeroth order scattering coefficients. However, by choosing appropriate coordinate...
The invisibility of cylindrical cloaks produced by arbitrary radially coordinate transformations is confirmed. The influence of a tiny geometrical perturbation at the inner boundary of the cloak is investigated. It is shown that a tiny perturbation would induce a noticeable field scattering, due to the slow convergence of the zeroth order scattering coefficients. However, by choosing appropriate coordinate...
The negative refraction of surface waves on a structured metal surface is proposed and demonstrated. Sub-wavelength imaging of a point diploe source through a slab structure is also shown.
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