Specialized directional beaming through a metalens and a typical application

Abstract

Abstract:The anomalous beaming effect of the periodic metallic corrugations functioning as a special case of k SP = 2π/Λ is discussed and verified by means of both theo retical calculation and experimental probing. A metalens is designed on the basis of the special case. Unlike the conventional beaming of convergence or divergence, the metalens can realize beam collimating, which is useful for practical applications. As a typical application example of the metalens, we integrate the metalens together with a vertical cavity surface emission laser (VCSEL) on the top surface of the aperture area. Our experimental results demonstrate that the integrated metalens is capable of suppressing the divergence angle of the VCSEL for colli mation use.

Selective light trapping of plasmonic stack metamaterials by circuit design

“…4 Plasmonic metamaterials have wide applications on light energy trapping, subwavelength microscopy, optical computing, optical cloaking, biomedical and chemical sensing. [5][6][7][8][9] In the optical range, a lot of plasmonic metamaterials have been reported such as reconfigurable plasmonic metamaterials, 10,11 plasmonic metamaterial absorbers, 12,13 low-loss plasmonic metamaterials, 14,15 and hyperbolic metamaterials. 16,17 In most of these research efforts, the plasmonic metamaterials are typically designed by solving Maxwell's equations based on the classic electromagnetic wave theory.…”

Directional beaming of surface plasmon polaritons from a metallic nanochannels with defected surface cavity

“…Meanwhile, periodic surface corrugation at the output interface of metallic slit has also been widely studied . Most recently, the proposed configurations such as implanted nanogrooves, metasurfaces, array of nanoslits, and metalens are aiming to enhance the directional beaming effects, which are particularly focused on the study of shape, size and periodicity of a metallic slit and array of nanoslits with straight channel. Despite the fact that SPPs have an essential role in beaming light, there is still a necessity for inclusive investigations into this phenomenon, especially the introduction of nanoslits with shaped channels and various configurations of bumps at the output interface, which represented surface defects that altered surface morphology.…”