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
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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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