A continuously amplitude-tunable superoscillating focusing lens based on a single-layer metal slit structure array
A focusing lens and super-oscillation technology, applied in the field of optical imaging and optical focusing
Active Publication Date: 2015-12-30
CHONGQING UNIV
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[0003] At present, there is no related report on the realization of continuous amplitude regulation through microstructures, and the most reported is still the binary amplitude regulation based on slits (that is, the amplitude transmittance is 0 or 1).
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[0039] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.
[0040] like image 3 and Figure 3A As shown, the continuous amplitude control super-oscillating focusing lens based on a single-layer metal slit structure array includes a substrate 1 , a metal film layer 2 , and a slit structure unit 3 .
[0041] Substrate 1 is a piece with a certain thickness t 1 The dielectric material has a high transmittance to the incident light wavelength λ. The metal film layer 2 is a layer with a certain thickness t 2 The metal material film is located on the substrate; the slit structure unit 3 is a metal film layer with a length of L (less than or equal to L) and a width of w (less than or equal to a) etched on the metal film layer with a length of L and a width of a. The slit, the depth of the slit and the thickness of the metal film layer t 2 same. A series of parallel slit structural units (3) constitute a...
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A continuous amplitude regulation and control ultra oscillation focusing lens based on a single layer metal slit structure array comprises a substrate, a metal film and slit structure units. Each slit structure unit is a slit carved on the metal film, wherein the length of the metal film is L, the width of the metal film is a, the length of the slit is l, the width of the slit is w, and the depth of the slit is the same as the thickness t2 of the metal film. The slit structure array is composed of the series of slit structure units which are parallel to one another, wherein the width of the ith slit structure unit is ai, and the width of the ith slit structure unit is wi. For the given lens amplitude spatial distribution A(xi), the width wi of the slit at the spatial position xi is determined through the relation A(w) between the width of the slit and the amplitude transmittance, and therefore planar amplitude spatial distribution A(xi) is achieved by the adoption of the corresponding slit structure array, and the ultra oscillation focusing function of the lens is achieved. The focusing performance of the ultra oscillation focusing lens can be improved, fox example, the focusing energy is improved, sidelobes of a focusing light field are reduced, and the field range of the focusing light field is enlarged.
Description
technical field [0001] The invention belongs to the field of light focusing and light imaging, in particular to a continuous amplitude control super-oscillation focusing lens. Background technique [0002] In micro-nano optical devices, the commonly used binary amplitude modulation often cannot achieve optimal performance, which greatly limits the design of super-oscillation focusing lenses. Arrays of subwavelength structures can be used to continuously control the amplitude of incident electromagnetic waves. Compared with the binary amplitude control, the continuous amplitude control can improve the design freedom of the super-oscillatory focusing lens and improve the focusing performance of the super-oscillating focusing lens, such as: increasing the focusing energy, reducing the side lobe of the focused light field, and expanding the focus of the light field. field of view etc. [0003] At present, there is no relevant report on the continuous modulation of the amplitud...
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IPC IPC(8): G02B3/00G02B26/00
Inventor 陈刚陈李温中泉何应虎李语燕
Owner CHONGQING UNIV