A Negative Index Grating Plano-Concave Mirror for Cylinder Vector Beam Focusing
A negative refraction, plano-concave mirror technology, applied in the field of optical materials, can solve the problems of difficult material selection and high preparation difficulty, and achieve the effects of simple design process, easy structure and simple structure
Active Publication Date: 2017-04-19
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology
However, the lens is composed of two or more materials, so it is difficult to select materials and difficult to prepare.
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[0015] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.
[0016] figure 1 (a) is a schematic diagram of the structure of the prism in the embodiment, wherein the mark d is the period along the longitudinal direction, and (b) is an example of the negative refraction effect of the prism.
[0017] Such as figure 2 As shown, the negative refractive index plano-concave mirror of this embodiment has a bessel-gauss distribution of incident light, and the incident light frequency is λ 0 = 532nm. for the lambda 0 = 532nm band has a negative refractive index n eff , the selected material is GaN by calculation. Considering the hypotenuse side of the right-angled triangular gr...
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The invention discloses a column vector light beam focusing negative refractive index optical grating plane-concave lens. The plane-concave lens is formed by the negative refractive prism optical grating made of the single material, and the outgoing surface is the concave surface. The plane-concave lens is formed by arranging circular optical gratings having the same height in a laminated manner, and the inner diameters of the circular optical gratings are, from bottom to top, equivalently increased, and the circular optical gratings can be used to form the cylindrically symmetric structure, and the inner sides of the circular rings are the vertical walls. The concave surface is not the continuous concave surface, and is the concave surface formed by the apical angle connecting line of the circular optical grating layers. The included angle between the apical angle connecting line of the optical grating of the k layer and the vertical surface is aik. The optical grating plane-concave lens is advantageous in that the structure is simple, the designed process is convenient, the structure is easy to prepare, and the focusing of polarized light in the radial direction and the turning direction in the sub-wavelength range can be realized.
Description
technical field [0001] The invention belongs to the field of optical materials, in particular to a negative refractive index grating plano-concave mirror used for sub-wavelength focusing of cylindrical vector light beams. Background technique [0002] As the most basic optical tool, lens plays an important role in optical microscope, high-density optical storage, laser engraving and other fields. With the development of science and technology, many fields are developing toward high integration and high density, and at the same time, higher requirements are put forward for the focusing spot of optical components. Cylindrical vector beams, as a kind of vector beams, have unique application ranges different from scalar beams due to their symmetry in cylindrical coordinates, and have shown potential application value in many fields. Cylindrical vector beams can be classified into radially polarized light and rotationally polarized light in a narrow sense. Subwavelength focusin...
Claims
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IPC IPC(8): G02B3/08
CPCG02B3/08
Inventor 许吉陈奕霖仲义王胜明时楠楠王瑾陆云清
Owner NANJING UNIV OF POSTS & TELECOMM