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Near-field surface plasmon complex amplitude modulation method based on metasurface

A surface plasmon and modulation method technology, applied in the field of micro-nano optics, can solve the problems of complex optical field distribution and propagation, and cannot easily and flexibly realize the regulation of surface plasmon, so as to achieve complex optical field distribution and The effect of spreading, reducing complexity

Active Publication Date: 2017-10-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0005] In order to solve the problem in the prior art that the in-plane control of surface plasmons cannot be easily and flexibly realized, a method for complex amplitude modulation of near-field surface plasmons based on metasurfaces disclosed in the present invention is to be solved. The problem is: to provide a near-field complex amplitude modulation method based on metasurfaces, which can excite surface plasmons and perform arbitrary complex amplitude modulation on the sub-wavelength scale, and realize complex light field distribution and propagation.

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Embodiment 1

[0044] In order to verify the feasibility of the method, taking the in-plane Airy beam as an example, the specific design of the metasurface nano-rectangular hole array is carried out. Airy beam is a kind of non-diffraction beam with self-restoring curved path, which has important application value in surface plasmon circuit and nanoparticle manipulation. At the initial position of the surface plasmon excitation, the complex amplitude expression of the Airy beam is:

[0045]

[0046] where x 0 is the width at half maximum of the main lobe, and a is the apodization term of the exponential function. The absolute value of the Airy function wave packet along the x direction exhibits a series of peaks, while the phase value is alternately segmented 0 and π. take x 0 = 0.8, a = 0.05, sample level range x = -15 μm to x = 2 μm.

[0047] Such as figure 1 As shown, a metasurface-based near-field surface plasmon complex amplitude modulation method disclosed in this embodiment inc...

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Abstract

The invention discloses a near-field surface plasmon complex amplitude modulation method based on metasurface, and belongs to the field of micro and nano optics. According to the method, the Berry phase principle is utilized, by adjusting the nano rectangular hole lengths and the orientation angles in all isomeric nano rectangular hole arrays in every cycle simultaneously, the discretized amplitude of a target optical field and phase information are obtained, therefore a surface plasmon is activated, arbitrary complex amplitude regulation is conducted on the surface plasmon in the sub-wavelength, and complex optical field distribution and propagation in the surface are achieved. The invention mainly aims at achieving the technical purpose of providing the near-field complex amplitude modulation method based on the metasurface which can activate the surface plasmon, conduct arbitrary complex amplitude regulation on the surface plasmon in the sub-wavelength and achieve the complex optical field distribution and propagation. The near-field surface plasmon complex amplitude modulation method based on the metasurface can arbitrarily modulate the amplitude and phase of the near-field surface plasmon, and has extremely good application value in the fields of surface wave beam shaping, an integrated electron-optical system, surface wave holography and the like.

Description

technical field [0001] The invention relates to a near-field surface plasmon complex amplitude modulation method, in particular to a near-field surface plasmon complex amplitude modulation method based on a Berry phase metasurface, which belongs to the field of micro-nano optics. Background technique [0002] Metamaterials is a general term for a class of artificial electromagnetic materials that achieve physical properties that do not exist in nature through the design of artificial micro-nano structures. Because of its important potential application value, it has become a frontier hot field of micro-nano optics. The metasurface can be regarded as a special planar two-dimensional metamaterial, which can change the phase and amplitude of the local light field through the strong optical response of the sub-wavelength periodic unit in the region whose thickness is much smaller than the wavelength of light, thereby Realize wavefront modulation of subwavelength pixels. Compare...

Claims

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Application Information

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IPC IPC(8): G02F1/01
CPCG02F1/01G02F1/0121
Inventor 黄玲玲宋旭赵睿哲李晓炜王涌天
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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