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Mixed metal-dielectric SSP (Spoof Surface Plasmon) periodic grating system as well as application and method thereof

A mixed-metal, mixed-type technology, applied in the field of nano-optics, can solve problems such as no calculation and comparison of propagation loss, limitation of electromagnetic wave enhancement, large velocity dispersion, etc.

Inactive Publication Date: 2016-10-26
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the group velocity dispersion of terahertz waves is large, and there are defects in some applications
However, there is no detailed calculation and comparison of the propagation loss between this improved metal grating and the traditional rectangular periodic grating structure
In the existing SSP-based periodic gratings, the adjacent structures are all air, so there is a great limit to the strengthening of the further confinement of electromagnetic waves

Method used

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  • Mixed metal-dielectric SSP (Spoof Surface Plasmon) periodic grating system as well as application and method thereof
  • Mixed metal-dielectric SSP (Spoof Surface Plasmon) periodic grating system as well as application and method thereof
  • Mixed metal-dielectric SSP (Spoof Surface Plasmon) periodic grating system as well as application and method thereof

Examples

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Embodiment 1

[0042] Such as image 3As shown, the hybrid metal-dielectric SSP periodic grating system of this embodiment includes: a hybrid metal-dielectric SSP periodic grating, an emission cathode E, a collector C and a magnetic focusing system FS; wherein, the hybrid metal-dielectric SSP periodic grating system The SSP periodic grating includes a substrate, a periodic trapezoidal structure, and a medium. A periodic trapezoidal structure is set on the substrate. The profile of the trapezoidal structure along the xz plane is trapezoidal, parallel to the y-axis, and between two adjacent trapezoidal structures. It is a trapezoidal groove; the trapezoidal groove is filled with medium. An emission cathode E is set on the left side of the hybrid metal-dielectric SSP periodic grating to emit an electron beam Eb with specific parameters. The electron beam enters along the upper surface of the periodic trapezoidal grating parallel to the x-axis, and the distance from the surface The height is G,...

Embodiment 2

[0044] In this embodiment, the upper bottom U of the trapezoidal groove is 15 μm, and the lower bottom L is 12 μm. Others are the same as in the first embodiment. Compared with the rectangular groove with a side length of 15 μm, the hybrid metal-dielectric SSP periodic grating can Expand the frequency band of SSP, such as Figure 7 At the same time, the hybrid metal-dielectric SSP periodic grating can effectively reduce the propagation loss of SSP, especially at the position close to the period boundary, such as Figure 8 shown.

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Abstract

The invention discloses a mixed metal-dielectric SSP (Spoof Surface Plasmon) periodic grating system as well as application and a method thereof. By adopting a mixed metal-dielectric SSP periodic grating, the technical advantages of the existing SSP periodic metal waveguide can be adopted, and near-field propagation of terahertz wave can be limited more effectively by dielectric filling, so that the system has the characteristic of low loss; external electron beams excite surface plasmon polaritons on the mixed metal-dielectric SSP periodic grating, so that efficient spoof surface plasmon polaritons can be obtained under the condition that the SSP dispersion is matched with the dispersion of the external electron beams; moreover, a periodic metal-dielectric surface is formed by dielectric filling, so that the spoof surface plasmon polaritons can be limited more effectively relative to a pure metal periodic grating; meanwhile, an implementation diagram of the system principle of electron beam excited SSP is given, so that the defect of low-power excitation in the existing optical excitation mode can be overcome, and the system has the characteristics of high power and high efficiency.

Description

technical field [0001] The invention relates to nano optics, in particular to a hybrid metal-dielectric SSP periodic grating and its application and method. Background technique [0002] Terahertz wave is a frequency magnitude of THz (1THz = 10 12 Hz) electromagnetic radiation, which is between microwave and infrared optics in the electromagnetic spectrum, so it is also called the terahertz gap (THzGap) from traditional electronics to microphotonics. In recent years, due to a series of unique advantages of terahertz waves, it has attracted extensive attention from domestic and foreign academic and industrial circles, and a new discipline related to the generation, transmission, manipulation and application of terahertz waves has been formed, namely terahertz science. with technology. Due to its unique position in the electromagnetic spectrum, terahertz waves exhibit a series of advantages that microwaves and infrared do not have. For example, compared with low-frequency m...

Claims

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Application Information

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IPC IPC(8): G02B5/00G02B6/124G02B6/122
CPCG02B5/008G02B6/1226G02B6/124
Inventor 刘永强杜朝海刘濮鲲
Owner PEKING UNIV
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