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A multivalued phase-binary amplitude hyperdiffractive hollow ring focusing device

A super-diffraction and device technology, which is applied in the field of optical imaging and optical focusing, can solve the problems of sidelobe intensity limitation, inability to achieve focusing performance, and low focusing efficiency, so as to improve focusing performance, reduce half-width, and improve focusing efficiency Effect

Active Publication Date: 2018-02-13
CHONGQING UNIV
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Problems solved by technology

For far-field super-diffraction focusing devices, binary amplitude control or quasi-continuous amplitude control is usually used, which often cannot achieve good focusing performance. The low focusing efficiency and excessive side lobe strength severely limit the development of super-diffraction devices.

Method used

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  • A multivalued phase-binary amplitude hyperdiffractive hollow ring focusing device
  • A multivalued phase-binary amplitude hyperdiffractive hollow ring focusing device
  • A multivalued phase-binary amplitude hyperdiffractive hollow ring focusing device

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Embodiment Construction

[0036] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0037] Such as figure 2 As shown, the far-field superdiffraction angular polarization hollow ring focusing device based on the medium-metal concentric ring structure array includes a substrate 1 , a medium ring structure unit 2 , and a metal circle structure unit 3 .

[0038] The substrate 1 is a dielectric material with a thickness h, which is transparent to the incident light wavelength λ, and whose upper and lower surfaces are parallel.

[0039] The medium circular structure unit 2 is located on the base 1 with a center radius r i (i represents the i-th concentric ring from the center to the outside), a dielectric ring with a width of w and a thickness of t, which is transparent to the incident light wavelength λ. Dielectric ring structure units 2 are concentrically distributed on the substrate 1 N, for a given incident light wavelength ...

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Abstract

The invention provides a multi-value phase-binary amplitude super-diffraction hollow ring focusing device comprising a base, medium circle structure units and metal circle structure units. The medium circle structure regulated and controlled by multi-value phase and the metal circle structure regulated and controlled by binary amplitude are adopted. The phase of emergent light is determined by the thickness of the medium circle structure. The amplitude of emergent light is determined by the thickness of the metal circle structure. Multi-value phase regulation and control and binary amplitude regulation and control can be realized by changing the thickness of the medium circles and the metal circles. A space plane concentric circle array is formed by utilizing the medium circle and metal circle structure units so that focusing device transmission function amplitude phase space distribution required by far-field super-diffraction angular polarization hollow ring focusing is realized, the far-field super-diffraction angular polarization hollow ring focusing function breaking through the diffraction limit is realized, the far-field super-diffraction angular polarization hollow ring focusing performance is enhanced, far-field super-diffraction focusing spots are reduced, focusing efficiency is enhanced, sidelobe is suppressed and the range of field of view is enlarged.

Description

technical field [0001] The invention belongs to the field of optical focusing and optical imaging, and in particular relates to a multi-value phase-binary amplitude control far-field super-diffraction focusing device. Background technique [0002] For conventional microlenses, although various phase structures are used, they still fail to break through the diffraction limit. For far-field superdiffraction focusing devices, binary amplitude control or quasi-continuous amplitude control is usually used, which often cannot achieve good focusing performance. The low focusing efficiency and excessive sidelobe intensity severely limit the development of superdiffraction devices. Far-field super-diffraction focusing is the result of precise interference of light waves. Therefore, it is very necessary to introduce phase control into the device transmittance function in the design and implementation of super-diffraction devices. The sub-wavelength structure based on multi-valued pha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/18
CPCG02B5/1876
Inventor 陈刚温中泉武志翔余安平
Owner CHONGQING UNIV
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