Method for designing focus-length-controllable and one-dimensional photonic crystal flat concave mirror

A dimensional photonic crystal and design method technology, applied in the direction of light guides, optics, optical components, etc., can solve the problems that can only be realized near the lens surface, cannot propagate a long distance, and is difficult to achieve effective applications, etc., to shorten the design Cycle, simple design method, easy-to-manufacture effect

Active Publication Date: 2015-12-02
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

GiladM.Lerman and others experimentally verified the focusing of radially polarized light by the plasmonic lens in the article entitled "Demonstration of Nanofocusing by the use of PlasmonicLens Illuminated with Radially Polarized Light", see NANOLETTERS Volume 9, Issue 5, Page 2139-2143, but the plasmonic lens The plasmon is a coupling mode of the evanescent wave, which cannot propagate for a long distance, and can only focus near the lens surfa

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  • Method for designing focus-length-controllable and one-dimensional photonic crystal flat concave mirror
  • Method for designing focus-length-controllable and one-dimensional photonic crystal flat concave mirror
  • Method for designing focus-length-controllable and one-dimensional photonic crystal flat concave mirror

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[0024] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0025] Design a one-dimensional photonic crystal plano-concave lens with a controllable focal length. The plano-concave lens is composed of one-dimensional photonic crystals with two materials A and B alternately arranged. The structural parameters of the photonic crystal are used as the unit, the thickness is fixed, and the inner diameter is from bottom to top. Increasing rings are laminated, and the exit surface is a concave surface connected along the adjacent ring layers, and the focal length is 6.5 μm in the visible light band.

[0026] First, determine that the light wave band of the plano-concave mirror is in the visible light band. After calculating the dispersion relationship of the one-dimensional photonic crystal, two materials MgF are selected. 2 And GaN, the refractive indices of the two are 1.38 and 2.67, and the thickness is a=10nm and b=140nm, see...

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Abstract

The invention discloses a method for designing a focus-length-controllable and one-dimensional photonic crystal flat concave mirror. The one-dimensional photonic crystal flat concave mirror is composed of one-dimensional photonic crystals formed through the alternate arrangement of a material A and a material B. Circular rings of fixed thickness are stacked up to form the one-dimensional photonic crystal flat concave mirror, wherein the structural parameters of photonic crystals are adopted as one unit of the circular rings and the internal diameters of the circular rings are gradually increased from bottom to top. The emitting surface of the one-dimensional photonic crystal flat concave mirror is in the form of a recessed surface formed through connecting the upper edges of adjacent circular rings. According to the technical scheme of the invention, the flat concave mirror is controllable in focus length. In this way, the structural parameters of a flat concave mirror of any focal length within a certain range can be automatically designed, and the incident ray and the emergent ray are positioned at the two ends of the incident plane of the flat concave mirror. Meanwhile, the method has no special requirement on the polarization state of the incident ray, and breaks through the dependency on the polarization of surface plasmon lens. Moreover, the light focusing in both the TE polarization state and the TM polarization state is realized at the same time. The method is also applicable to linearly polarized lights. The invention has the advantages of simple design method and simple manufacture. By adopting the design method, the design cycle is shortened.

Description

technical field [0001] The invention belongs to the field of artificial microstructure materials and fine light field regulation, and in particular relates to a design method of a plano-concave mirror with controllable focal length. Background technique [0002] With the development of scientific processing technology, it is now possible to process materials as small as nanometers, and these materials have many special effects that they do not have at the macro scale, such as quantum size effects, small size effects, surface and Therefore, it has broad application prospects in the fields of communication, biomedicine, sensing and storage. Artificial microstructured materials refer to the structural design and integration of materials in the micro-nano scale range to achieve flexible control of electromagnetic waves and obtain some novel optical properties. [0003] Compared with scalar beams, vector beams with non-uniform distribution of polarization state contain more abun...

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Application Information

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IPC IPC(8): G02B6/122
CPCG02B6/1225
Inventor 许吉王胜明仲义任蓉王瑾陆云清
Owner NANJING UNIV OF POSTS & TELECOMM
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