Wedge-shaped inclined slit long-focal-depth Plasmon lens

A plasmon and slit technology, applied in the field of transverse magnetic linearly polarized light focusing lens, to achieve the effect of high focusing efficiency and large focal depth

Active Publication Date: 2017-09-19
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Hongyan Shao et al. published in the journal "Plasmonics" in 2016 entitled "Plasmonic Planar Lens Based on Slanted NanolistArray" proposed a planar metal lens structure that can achieve tight focusing of linearly polarized light, overcoming the structural difficulties of curved lenses , but there is still a lot of room for optimization in its focusing effect such as the depth of focus

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  • Wedge-shaped inclined slit long-focal-depth Plasmon lens
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  • Wedge-shaped inclined slit long-focal-depth Plasmon lens

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Embodiment Construction

[0025] Below in conjunction with specific embodiment and accompanying drawing, the patent of the present invention will be further described.

[0026] Such as figure 1 As shown, the wedge-shaped inclined slit long focal depth plasmonic lens is formed by constructing a central slit with a vertical uniform width on a flat metal film and a wedge-shaped inclined slit symmetrical to the left and right of the central slit, which is symmetrical to the central slit The slits appear in pairs, here it is set to 3 pairs. The thickness of the metallic silver film is selected as H=0.64 μm, the reference slit width is w=0.1 μm, and the slit spacing is Λ=0.45 μm, which is defined by the center spacing between adjacent slit outlets at the exit surface. The filling medium in the slit is air, and its relative permittivity is ε d =1, when the incident wavelength is λ=632.8nm, the relative permittivity of silver is ε m = -17.79+0.197i, β can be calculated according to formula (2). Further uti...

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Abstract

The invention discloses a wedge-shaped inclined slit long-focal-depth Plasmon lens. The wedge-shaped inclined slit long-focal-depth Plasmon lens is characterized in that the wedge-shaped inclined slit long-focal-depth Plasmon lens is formed by constructing a vertical central slit with uniform width and wedge-shaped inclined slits which are bilaterally symmetrical with the central slit on a planar metal film; the lens can realize the focusing effect with long focal depth when the lens is in the vertical incidence condition of polarized light of a transverse magnetic line; in the structure, the central slit is selected as a lens symmetric axis; the wedge-shaped inclined slits appear in pairs for the central slit and are symmetrical with the central slit; the wedge-shaped inclined slits incline outwards relative to the central slit on an incidence plane end, and the slit towards outside most has a bigger inclination angle; when the slit incident end is wider than the emitting end, the symmetric slit inner wall inclination angle, outer wall inclination angle and the width are the same; and the wedge-shaped inclined slit long-focal-depth Plasmon lens realizes the focusing effect with long focal depth for the polarized light of the transverse magnetic line for the planar metal Plasmon lens. The wedge-shaped inclined slit long-focal-depth Plasmon lens is compact in structure, is convenient for preparation and production in reality, and has better application prospects in the optical micro manipulation field, the optical micro processing field and the like.

Description

technical field [0001] The invention belongs to the field of subwavelength photonics and integrated optics, in particular to a transverse magnetic linearly polarized light focusing lens based on the plasmon effect. Background technique [0002] Surface plasmon polaritons (SPPs), electromagnetic waves (EW) coupled with collective electron oscillations propagating at the interface between metals and dielectrics, have been rapidly developed in the past 10 years. Because of their excellent properties, they offer great potential to control beam propagation and modulate the distribution of light fields at the nanoscale, and have attracted extensive attention in this field. More and more plasmonic components have been proposed to achieve various functions and have shown good performance in both simulations and experiments. [0003] Surface plasmons can break through the diffraction limit and have strong local field enhancement characteristics, which can realize nanoscale optical i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/00G02B6/122
Inventor 许吉孙嘉晨张茜李洋时楠楠陆云清
Owner NANJING UNIV OF POSTS & TELECOMM
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