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A Nonlinear Phase Gradient Metasurface Based on Rotating Crystal Orientation

A metasurface, nonlinear technology, applied in nonlinear optics, instruments, polarization elements, etc., can solve problems such as the absence of nonlinear phase gradients, limited geometric phase development, etc.

Active Publication Date: 2019-12-31
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] Obviously, the above-mentioned nonlinear optical geometric phase is for the generated high-order harmonics, but for the linear optical system, that is, for the fundamental wave, in people's cognition, there is no nonlinear phase gradient , which greatly limits the development of the geometric phase in linear optical systems

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  • A Nonlinear Phase Gradient Metasurface Based on Rotating Crystal Orientation
  • A Nonlinear Phase Gradient Metasurface Based on Rotating Crystal Orientation
  • A Nonlinear Phase Gradient Metasurface Based on Rotating Crystal Orientation

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Embodiment 1

[0026] Without loss of generality, the choice here has triple rotational symmetry (C 3 ) for an equilateral triangle hole as an example, the metal layer material is selected as gold, and the dielectric constant is obtained from the Palik optical manual. Using CST software to simulate and optimize the structure, the simulation waveband is 600-750nm, the parameters of the optimized unit structure are p=300nm, h=120nm, triangle side length d=150nm.

[0027] The phase difference generated by the rotating unit structure is as figure 2 shown. It can be seen that in the entire 600-750nm band, every 10° rotation of the unit structure produces a relatively stable phase difference of 60°, which satisfies the relationship of Φ=±6θ.

[0028] Next, a full model with beam deflection effect is designed to examine this phase gradient. Arrange the rotated unit structure along the x-axis direction, a beam of left-handed circularly polarized plane waves is incident on the metasurface from be...

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Abstract

The invention provides a non-linear phase gradient metasurface based on rotation crystal direction. The non-linear phase gradient metasurface comprises C3 and C5 sub-wavelength metal holes or slits with higher-order rotation symmetry. According to the nonlinear phase gradient metasurface, a selection rule of a conventional geometric phase metasurface unit structure is broken through, and the singular nonlinear geometric phase gradient is obtained in a linear optical system through design of the triangular, Y-shaped and pentagonal sub-wavelength metal holes or slits with multi-rotation symmetry; the phase gradient is different from the conventional nonlinear phase, the conventional nonlinear phase usually refers to the phase carried by higher-order harmonic waves (n>=2), and the generated phase gradient is from fundamental waves (n=1); and according to the non-linear phase gradient metasurface, the nonlinear phase gradient is realized in the linear metasurface, the cognition of the geometric phase in the linear metasurface for people is overthrown, and a great significance is attached to the principle and application of phase modulation in the linear optical system.

Description

technical field [0001] The invention relates to the field of electromagnetic wave phase regulation, in particular to a nonlinear geometric phase gradient metasurface generated in a linear optical material. Background technique [0002] In a linear optical system, the incident circularly polarized light interacts with anisotropic metafunctional units, and the transmitted or reflected light has a circularly polarized light with a chirality opposite to that of the incident light, and carries the superstructured functional units. The geometric phase related to the rotation angle is the Pancharatnam-Berry geometric phase. The main advantage of the P-B geometric phase is that it does not depend on the size of the structure, optical resonance, and inherent material dispersion, so it has received extensive attention and research in the field of phase manipulation. Usually, sub-wavelength structures such as rectangular holes / pillars and elliptical holes / pillars are selected as metas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/35
CPCG02B5/3083G02F1/35
Inventor 罗先刚马晓亮蒲明博李雄谢鑫
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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