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A blazed negative refraction grating lens with controllable focal length and its design method

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, easy acquisition of materials, and strong focusing effect

Active Publication Date: 2022-04-05
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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  • A blazed negative refraction grating lens with controllable focal length and its design method
  • A blazed negative refraction grating lens with controllable focal length and its design method
  • A blazed negative refraction grating lens with controllable focal length and its design method

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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] Such as 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 inside to outside. Consists of circular pyramids. The annular pyramid is a rotating body structure formed by a right-angled triangle, which rotates along a straight line parallel to its right-ang...

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Abstract

The invention discloses a blazed negative refraction grating lens with controllable focal length and a design method thereof. The negative refraction blazed grating lens is a cylindrically symmetric structure, including a negative refraction grating plano-concave mirror and a blazed ladder. The design method The method includes the following steps: selecting the structural parameters of the negative refraction grating plano-concave mirror; calculating the equivalent negative refraction index; calculating the shape structure of the negative refraction grating plano-concave mirror; determining the shape structure of the annular pyramid; Negative refractive grating lens. The method can realize the flexible control of the preset focal length, realize the focusing effect of the incident light and the outgoing light on the same side of the normal line, enhance the energy utilization efficiency, and make the energy of the electromagnetic wave 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 Patents(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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