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High-efficient metal heterogenous light waveguiding device for nanometer focus

An optical waveguide, metal light technology, applied in the field of information, can solve the problems of only 20% optical energy efficiency, difficult coupling and connection with high efficiency, and the difference in SPW propagation phase speed cannot be very large.

Inactive Publication Date: 2007-04-04
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the probe is made of the same metal, on the one hand, the propagating phase velocity of SPW cannot be greatly different; on the other hand, since the fan-shaped structure is an open structure, radiation loss of light energy is inevitable.
Therefore, although the structure enables a spot size of 30nm×30nm at a distance of 10nm from the probe, the light energy efficiency is only 20%
In addition, this structure is not easy to achieve high-efficiency coupling connection with other nanophotonic devices (such as optical waveguides, etc.)

Method used

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  • High-efficient metal heterogenous light waveguiding device for nanometer focus
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  • High-efficient metal heterogenous light waveguiding device for nanometer focus

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Embodiment Construction

[0019] Specific implementation

[0020] By converting the light waves into SPW propagating on the metal-dielectric surface, the SPW can be confined to a small spatial scale, and overcomes the limitation of Rayleigh diffraction limit when the conventional guided light waves are focused. At the same time, the SPW has different propagation phase velocities on different geometric structures and different metal surfaces, and tends to propagate in the low phase velocity region, to achieve ultra-diffraction-limited nano-self-focusing with high light energy coupling efficiency. The greater the difference in phase velocity, the more obvious the focusing effect. Figure 2 shows the dependence of the SPW propagation constant on the lateral geometric width of the waveguide in different metal (gold, silver and aluminum) nanowaveguides. It can be seen from the figure that when nano-waveguides made of the same metal material have different widths, the propagation constants of SPW are different (a...

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Abstract

A light waveguide component having metal light waveguid bodies distributed symmetrically features that metal material with different plasma wave SPW transmission constant on surface is used to form metal light wave guide body as metal with high constant is embedded in metal with low constant. It can focus light spot to be size of 20mX30nm=0.002lambda2 and achieve light energy coupling efficiency to 47% or above.

Description

Technical field [0001] The invention belongs to the field of information technology, and particularly relates to a structural design of a photonic device that realizes ultra-diffraction limit nano-focusing. Background technique [0002] The size of the focused spot of the beam directly determines the application prospects of the optical system in high-density data storage, nanophotonics, near-field optics, biology, chemical sensing, quantum optics and other fields. The smaller the spot, the greater the application potential. However, limited by diffraction effects, a beam of light can generally only be focused on the order of the wavelength of the illuminating light. In order to reduce the size of the illumination spot, the most representative method at present is to reduce the spot size to below 100nm through a micro-hole [1] , But the light energy utilization rate is very low, generally 10 -3 To 10 -5 And the magnitude. Recently, the use of ridge waveguide [2] The structure has...

Claims

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Application Information

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IPC IPC(8): H01P3/12G02B6/10G02B21/00
Inventor 汪国平王兵
Owner WUHAN UNIV