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A system and method for eliminating sidelobes of super-oscillation spot

A super-oscillation and side-lobe technology, applied in the field of super-resolution imaging, can solve the problem of the difficulty of breaking through the size of the super-diffraction focusing spot, and achieve the effects of reducing processing cost and difficulty, large resolution field of view, and simple binary structure.

Active Publication Date: 2021-09-07
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From the existing research results, it can be seen that the currently realized super-diffraction focused spot size is difficult to break through 0.3λ

Method used

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  • A system and method for eliminating sidelobes of super-oscillation spot
  • A system and method for eliminating sidelobes of super-oscillation spot
  • A system and method for eliminating sidelobes of super-oscillation spot

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Embodiment 1

[0039] see figure 1 and 3 1. A system for eliminating super-oscillation spot side lobes, comprising: a laser 1, a focusing lens 2, a circular lobe structure 3, an objective lens 4, a barrel lens 5, and an imaging unit 6 placed in sequence; the laser 1 is used to generate a single color laser; the focusing lens 2 is used to focus the laser output from the laser 1 to generate a quasi-planar light beam within the depth of focus; the circular lobe structure 3 includes a symmetrical circular lobe pair 31, which is formed inside the circular lobe pair 31 There is a circular petal hole 32 with an opening in the Y direction, which is used to induce a high-order spectral component with a circularly symmetrical distribution for the quasi-planar light beam, and the high-order spectral component is at the level of the circular petal small hole 32 as the light wave propagates. Coherent superposition in the axial direction forms a super-oscillating focused light needle without side lobes; ...

Embodiment 2

[0055] The difference between embodiment 2 and embodiment 1 is that the radius of the base circle Y1 is 7 μm, and the lobe width of the circular lobe pair 31 is 1 μm. The diagram of the super-oscillating optical needle produced by the circular petal structure with a radius of 7 μm and a petal width of 1 μm is shown in FIG. 6( a ). In this embodiment, the disc aperture 32 with a radius of 7 μm and a disc width of 1 μm produces a super-oscillating focused spot pattern at a point where the super-oscillating light needle propagates at 3 μm, as shown in FIG. 6( b ). The light intensity distribution diagram of the super-oscillating light needle produced by the circular petal hole 32 with a radius of 7 μm and a petal width of 1 μm in this embodiment is shown in FIG. 6( c ).

[0056] In summary, the present invention utilizes the geometric sharp-edge structure of binary amplitude modulation to construct a center-symmetric circular lobe structure, and generates a super-oscillating ligh...

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Abstract

The invention discloses a system for eliminating super-oscillation spot side lobes, comprising: a laser 1, a focusing lens 2, a circular lobe structure 3, an objective lens 4, a barrel lens 5 and an imaging unit 6 placed in sequence; the focusing lens 2, It is used to focus the laser output from the laser 1 to generate a quasi-plane beam within the depth of focus; the circular petal structure 3 includes a symmetrical circular petal pair 31, and a circular petal with an opening in the Y direction is formed inside the circular petal pair 31 The hole 32 is used to induce a high-order spectral component with a circularly symmetrical distribution to the quasi-planar light beam. The high-order spectral component propagates along with the light wave. The small hole of the circular lobe of this solution has an opening in the Y direction, and the induced high-frequency The components are superimposed from the tip of the Y direction to the center of the base circle, and there is no contribution of high-frequency components in the Y-axis opening direction, so that there is almost no side lobe in the Y-axis direction of the focused spot, and it has a large resolution field of view. It will be applied to more Extensive super-resolution imaging.

Description

technical field [0001] The invention relates to the technical field of super-resolution imaging, in particular to a system and method for eliminating side lobes of super-oscillation spots. Background technique [0002] The superoscillation phenomenon is a phenomenon that realizes far-field superdiffraction focusing outside the evanescent wave region, and its essence is that the band-limited function oscillates faster than its highest Fourier component in the local region. Generally speaking, the superoscillation phenomenon is the result of the coherent superposition of light fields, and arbitrarily small focus distributions can be achieved in the far-field region. However, as the size of the superoscillation focus decreases, the energy of the superoscillation focused spot decreases significantly, and at the same time With the generation of high-intensity side lobes, the super-resolution field of view is suppressed. [0003] The understanding of the nature of super-oscillati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/00G02B27/42G02B27/58
CPCG02B27/0025G02B27/42G02B27/58
Inventor 付神贺王仕旺呼燕文陈振强李真尹浩
Owner JINAN UNIVERSITY
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