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Blazed negative refraction grating lens with controllable focal length and design method thereof

A technology of blazed grating and design method, applied in the field of optical micro-manipulation, can solve the problem that the focusing effect of polarized light is not very ideal, and achieve the effect of simple and clear design method, strong focusing effect and energy concentration

Active Publication Date: 2020-11-10
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Because the focusing effect of polarized light is not very ideal for this kind of negative refraction negative refraction grating plano-concave mirror, a blazed negative refraction grating that can enhance the focusing effect is proposed for the structure of this kind of negative refraction grating plano-concave mirror lens

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  • Blazed negative refraction grating lens with controllable focal length and design method thereof
  • Blazed negative refraction grating lens with controllable focal length and design method thereof
  • Blazed negative refraction grating lens with controllable focal length and design method thereof

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Embodiment Construction

[0043] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0044] like Figure 1 to Figure 9 As shown, a design method of a negative refraction blazed grating lens with controllable focal length, including a two-part structure of a negative refraction grating plano-concave mirror 1 and a blazed ladder 2, the incident surface of the negative refraction grating plano-concave mirror 1 is a plane, and the exit surface is Smooth slope, the negative refraction grating plano-concave mirror 1 is composed of concentric ring steps with the same medium refractive index, equal height, and gradually increasing radius from the inside to the outside. Consists of circular pyramids. The annular pyramid is a rotating body structure formed by a right-angled triangle that rotates along a straight line parallel to its right-...

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Abstract

The invention discloses a blazed negative-refraction grating lens with controllable focal length and a design method thereof. The grating lens is of a cylindrical symmetrical structure and comprises anegative-refraction grating plano-concave lens and a blazed step, and the design method comprises the following steps: selecting structural parameters of the negative-refraction grating plano-concavelens; calculating an equivalent negative refractive index; calculating the morphology structure of the negative refraction grating plano-concave lens; determining the morphology structure of the annular pyramid; and obtaining the blazed negative refraction grating lens capable of realizing strong focusing. According to the method, the preset focal length can be flexibly regulated and controlled,the focusing effect of the incident light and the emergent light on the same side of the normal is achieved, the energy utilization efficiency is improved, and the energy of electromagnetic waves is more concentrated.

Description

technical field [0001] The invention relates to the technical field of optical micro-manipulation, in particular to a blazed negative refraction grating lens with controllable focal length and a design method thereof. Background technique: [0002] Artificial microstructure is a hotspot in the field of optics. It can achieve some effects that macrostructures do not have, such as particle acceleration, single-molecule imaging, small size effect and quantum tunneling effect. Photolithography and other fields have broad application prospects. The traditional parabolic mirror makes the beam converge in the same direction by changing the phase of the wavefront, but its reflection focusing method has certain shortcomings. There is mutual influence, which limits the use range and focusing effect of the focal field. In addition, traditional lenses can only achieve ideal focusing under paraxial conditions, and have certain requirements for the polarization state of light. Continue ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00G02B5/18
CPCG02B27/0012G02B5/1814
Inventor 孙钰淇许吉杨茜刘扬眉刘山峰李康陆云清刘宁
Owner NANJING UNIV OF POSTS & TELECOMM
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