One-dimensional metallic photonic crystal plano-concave mirror for cylindrical symmetrical vectorial light beam focusing

Abstract

The invention discloses a one-dimensional metallic photonic crystal plano-concave mirror for cylindrical symmetrical vectorial light beam focusing, and relates to the field of light field regulation in sub-wavelength photonics. The plano-concave mirror is composed of a one-dimensional metallic photonic crystal with metallic layers and dielectric layers arranged periodically and alternatively, and along the periodic photonic direction of the photonic crystal, one side is a plane while the other side is a hemispherical concave surface. By making full use of negative refraction properties and simultaneous orthogonal polarized light regulation capacity of the photonic crystal, the structure can effectively focus radial and spiral polarized light, and sizes of focused light spots reach sub-wavelength magnitude. In other words, by the structure, sub-wavelength focusing of cylindrical symmetrical vectorial light beams of any polarization component can be realized. By changes on constituent materials and structural parameters, focusing effect can be realized within broadband. The plano-concave mirror is simple in constituent material, easy for designing parameters and structurally easy to produce, and has good application prospects in the fields of near-field optics, quantum optics and the like.

Description

technical field [0001] The invention relates to a metal microstructure used for light field regulation in the fields of subwavelength photonics, quantum optics, and optical micromanipulation, and in particular to a photonic crystal plano-concave used for subwavelength focusing of cylindrically symmetric vector beams The mirror belongs to the intersection field of artificial microstructure materials and fine light field regulation. Background technique [0002] The flexible control of electromagnetic waves by artificial microstructures and the novel optical properties of subwavelength microstructures are currently research hotspots in the interdisciplinary fields of optics and multidisciplinary frontiers. The fine optical field control of cylindrically symmetric vector beams has broad and long-term application prospects in research fields such as subwavelength photonics, near-field optics, and quantum optics. Through the sub-wavelength scale design of the material structural...

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Problems solved by technology

[0014] The purpose of the present invention is to overcome the limitation of the polarization state caused by the excitation effect of the surface plasmon in the sub-wavelength scale focusing of the existing cylindrical symmetric vector beam, and to break through the limitation of the metal photonic crystal light field control object, to provide a One-dimensional metal photonic crystal plano-concave mirror for simultaneous subwavelength-scale focusing of polarized light and hand-polarized light

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