Dielectric metasurface-based polarization generator and design method thereof

A design method and metasurface technology, applied in polarizing elements, instruments, optics, etc., can solve the problems of reduced transmission brightness and energy loss, and achieve the effects of easy processing, high flexibility, and simple structural design

Inactive Publication Date: 2019-06-07
DONGGUAN UNIV OF TECH
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Problems solved by technology

Most of these devices are used to generate linearly polarized light, and while the desired polarization state is obtained, other

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  • Dielectric metasurface-based polarization generator and design method thereof
  • Dielectric metasurface-based polarization generator and design method thereof
  • Dielectric metasurface-based polarization generator and design method thereof

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[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] To verify the above design method, we simulated the electromagnetic properties of the metasurface. First, we take the incident wavelength of 4.2 μm in the mid-infrared as an example. The unit resonator used is composed of two layers of dielectric materials, the lower layer is a substrate composed of calcium fluoride, a high-transmittance material for mid-infrared, and the upper layer is an array composed of silicon. After optimization, the lattice constant of the unit structure is obtained (the optimum is 1.8um, the range is 1.75-1.85um) p x =p y =1.8μm, (2.5um optimally, range is 2.45-2.55um) height h=2.5μm, rectangular column l=1.3μm, w=0.6μm in MS3. like figure 2As shown, the MS1 structure consists of 12 rows and 32 columns, that is, 384 rectangular pillar nano-antennas (the number of rectangular pillar antennas is not limited, and more can be selected), and...

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Abstract

The invention provides a polarization generator based on a medium metasurface and a design method thereof. The designed polarization generator is integrated by three groups of double-vibration-state focusing metasurfaces; According to parabolic phase distribution, an x-line polarization component and a y-line polarization component of incident light, a 45-degree linear polarization component and a135-degree linear polarization component, and a left-hand circular polarization component and a right-hand circular polarization component are extracted and focused to six different positions of a transmission surface respectively. The transmission type metasurface is composed of a two-layer structure, a substrate and a rectangular column array with the sub-wavelength thickness. The transmissiontype resonance unit of the transmission type metasurface is composed of a rectangular nano antenna, and phase response to different polarization states is achieved by changing the length, the width and the rotation angle of an optical axis through a double-phase modulation method. According to the design method, for different incident wave lengths, high-transparency materials of corresponding wavebands can be selected to design the metasurface, so that the design method has very high flexibility, is simple in structural design and convenient to process, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of integrated optical device design based on artificial composite material metasurface, and specifically relates to a medium-based metasurface plane lens and a dual-phase control method. Background technique [0002] The generation and processing of polarized light has traditionally utilized a series of well-arranged polarizers, such as polarimeters and waveplates, placed in succession along the optical path in front of the detector. Traditional discrete optical components are bulky, complex to measure, and costly, and cannot meet today's requirements for the integration of optical devices. The creation of artificial surface nanostructures—optical metasurfaces—has attracted a lot of attention due to their simplification in optical manipulation and the development of fabrication techniques. Metasurface has the characteristics of ultra-thin and miniature, which solves the disadvantages caused by the volume pr...

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Application Information

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IPC IPC(8): G02B5/30G02B27/00
CPCG02B1/00G02B5/30G02B26/06G02B27/00G02F1/35
Inventor 沈飞郭忠义郭凯周红平周清峰田丽华
Owner DONGGUAN UNIV OF TECH
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