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Multi-mode excitation structure based on compact resonator

A resonant cavity and multi-mode technology, applied in resonators, phase influence characteristic measurement, instruments, etc., can solve problems such as complex MIM waveguide structures, achieve strong field confinement capabilities, and simplify structures

Active Publication Date: 2021-11-26
CHINA ACADEMY OF SPACE TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a multi-mode excitation structure based on a simple resonant cavity and a refractive index sensor, which are used to solve the problem that the MIM waveguide structure is too complicated in the prior art

Method used

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  • Multi-mode excitation structure based on compact resonator
  • Multi-mode excitation structure based on compact resonator
  • Multi-mode excitation structure based on compact resonator

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Embodiment 1

[0040]As shown in Figure 1, both the input channel and the output channel are coupled with the upper end of the resonant cavity. In this structure, the refractive index of the filling material in the resonant cavity is n=1.00. Figure 2a For its transmission spectrum, there is only one transmission peak at λ=865nm. Figure 2c is the distribution diagram of the magnetic field mode at the peak position, from which it can be seen that this is a typical antisymmetric mode. When the resonant cavity and the output channel are coupled at the bottom, the structure is as follows Figure 1b , whose transmission spectrum is as Figure 2b . It can be seen by comparison that, in addition to the transmission peak at the original position, λ=865nm, there is another transmission peak at λ=1162nm. Figure 2d Its magnetic field mode distribution diagram shows that the energy of SPPs is concentrated in the opposite corner of the resonator, which we call the corner mode. The above two struct...

Embodiment 2

[0043] Such as image 3 As shown, at this time, the input channel is still coupled with the resonant cavity at the upper end, while the output channel is coupled with the resonant cavity at the bottom end. Figure 4a Given that L=H changes at the same time, image 3 The variation of the transmission spectrum of the structure shown, Figure 4a A plot of each mode versus L=H is given in the inset. It can be seen that the new structure system co-excites four different cavity modes, and each cavity mode changes in direct proportion to L=H, which provides a reference for realizing specific wavelength selection. Figure 4b -e respectively shows the distribution of the magnetic field modes corresponding to each mode, at this time L=H=500nm. The four modes correspond to each other: Mode A, λ=865nm, is an anti-symmetric mode, which maintains the law of the previous structure; Mode B, λ=1132nm, is a left-right symmetric mode; valley mode, λ=1152nm, is an angular mode, which is the sa...

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Abstract

The present invention provides a multi-mode excitation structure based on a simple resonant cavity, including a metal layer, a resonant cavity, an input channel and an output channel, the resonant cavity, the input channel and the output channel are located in the metal layer, the input channel and the The output channel is filled with air, the resonant cavity is filled with air or other refractive index materials, the resonant cavity is rectangular in shape, the input end of the input channel is open, the output end of the output channel is open, and the input The upper end of the channel is aligned with the upper end of the resonant cavity for upper end coupling, and the output channel and the resonant cavity are coupled in one of the following three ways: upper end coupling; lower end coupling; bottom end coupling. The structure is based on the MIM waveguide, which has strong field confinement ability and can break through the diffraction limit; it does not need to increase the number of resonant cavities to achieve multi-mode excitation in the cavity, which simplifies the structure, and has a wide range of optional wavelengths and is easy to adjust.

Description

technical field [0001] The invention relates to the field of micro-nano photon technology, in particular to a multi-mode excitation structure based on a simple resonant cavity. Background technique [0002] Surface plasmons (SPPs) are electromagnetic shock waves that propagate along the metal-dielectric interface and decay exponentially in two directions perpendicular to the interface. Because they can break the diffraction limit of traditional optics, SPPs and The interaction between light fields realizes the modulation of light at the sub-wavelength scale, thereby realizing the miniaturization of optoelectronic devices. Compared with other SPP-based structures, metal-medium-metal (MIM) waveguides are simpler and have stronger optical field localization capabilities. With the development of nanofabrication technology, these MIM-based waveguides can realize the microstructure of various functional devices. Nanostructures will be widely used in highly integrated SoCs. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/122G02B6/14
CPCG01N21/41H01P1/16H01P7/06
Inventor 陈召俞耀伦王洋洋郭楠肖林
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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