CN115173008A - Tubular channel type terahertz frequency divider based on Fabry-Perot resonance - Google Patents

Abstract

The invention relates to a tubular channel type terahertz frequency divider based on Fabry-Perot resonance, which is characterized in that the tubular channel type terahertz frequency divider is of an input multi-output circular tubular channel structure, broadband terahertz waves enter an input port of the terahertz frequency divider in a grazing incidence mode and then enter a plurality of paths of circular tubular output channels, the terahertz waves carry out Fabry-Perot resonance in the tubular channels, and a plurality of terahertz signals with different main frequencies are output through a plurality of circular tubular output ports. The terahertz wave frequency division can be realized by constructing tubular channels with different inner diameters in the homogeneous block material, the material is selected more (such as plastic, organic glass and the like), the processing method of the channel structure is simple (such as 3D printing, integral punching of the material and the like), and special cladding design is not needed, so that the complexity and the cost of the frequency divider are reduced. The spatial distribution of the frequency division signals is determined by the position arrangement of the output channels, and the frequency division signals can be output by a linear array or an area array and can be specially customized, so that the frequency division signals have strong expansibility for different application scenes.

Description

Tubular channel terahertz frequency divider based on Fabry-Perot resonance

technical field

The invention relates to a terahertz regulation technology, in particular to a tubular channel type terahertz frequency divider based on Fabry-Perot resonance.

Background technique

Terahertz waves usually refer to electromagnetic waves with frequencies in the range of 0.1THz-10 THz. Due to the advantages of instantaneousness, broadband, coherence, and penetrability to non-polar substances, terahertz technology is widely used in medicine, biology, etc. Science, materials science, chemistry, military defense and security inspection and many other fields.

Especially in terms of communication, the terahertz frequency band is also the core frequency band of the future 6G communication technology. However, compared with other mature frequency bands, people are still groping for a series of problems in the terahertz frequency band, including the frequency division of the terahertz frequency band. The existing communication frequency division methods, such as the fused taper fiber frequency divider and the integrated optical waveguide type wavelength division multiplexer, are not suitable for the terahertz frequency band, and the structure is complex and expensive.

SUMMARY OF THE INVENTION

Aiming at the problem of terahertz frequency division, a tubular channel terahertz frequency divider based on Fabry-Perot resonance is proposed. The main frequency of terahertz Fabry-Perot (F-P) resonance can be adjusted by using the inner diameter of the channel. One feature is to achieve frequency division of the terahertz frequency band through multiple ports with different apertures.

The technical scheme of the present invention is as follows: a tubular channel-type terahertz frequency divider based on Fabry-Perot resonance, which is a circular tubular channel structure with one input and multiple outputs, and a wide-band terahertz wave is grazingly incident into the terahertz frequency divider. The input port then enters the multi-channel tubular output channel. The terahertz wave performs Fabry-Perot resonance in the tubular channel, and multiple terahertz signals with different main frequencies are output from the multiple tubular output ports.

Preferably, the diameter of the cylindrical output channel is determined by the size of the terahertz main frequency that needs to be frequency-divided, and the main frequency of the terahertz signal output by the cylindrical output port is:

Among them, f is the terahertz main frequency output by a certain output channel port, d is the inner diameter of the corresponding cylindrical output channel, c is the speed of light in vacuum; angle.

Preferably, the output channel ports are not limited to be distributed in the form of linear array or area array in space.

Preferably, the terahertz frequency divider is made by processing a channel structure inside a homogeneous bulk non-metallic material.

其中c为真空中的光速；θ为太赫兹波入射进输入端口内与通道内壁法线的夹角。A broadband terahertz wave frequency division method, the broadband terahertz wave is grazingly incident into an input port, the input port is divided into at least two tubular channels for output, and the terahertz wave undergoes Fabry-Perot resonance in the tubular channel, corresponding to different tubes. The diameter output channel outputs terahertz waves with different main frequencies, and the relationship between the main frequency f of the output terahertz wave and the diameter d of the output channel is:

where c is the speed of light in vacuum; θ is the angle between the terahertz wave incident into the input port and the normal to the inner wall of the channel.

The beneficial effects of the present invention are as follows: the present invention is based on the tubular channel-type terahertz frequency divider based on Fabry-Perot resonance, and the terahertz wave frequency division can be realized by constructing tubular channels with different inner diameters in a homogeneous bulk material. There are many choices (such as plastic, plexiglass, etc.), the processing method of the channel structure is simple (such as 3D printing, the overall drilling of the material, etc.), and no special cladding design is required, so the complexity and cost of the frequency divider are reduced. The spatial distribution of the frequency-divided signal is determined by the position of the output channels. It can be output by line array, area array, or can be specially customized, so it has strong scalability for different application scenarios.

Description of drawings

Fig. 1 is the input port structure schematic diagram of the tubular channel type terahertz frequency divider of the present invention;

2 is a schematic diagram of the frequency dividing structure of a tubular channel type terahertz linear array based on Fabry-Perot resonance according to the present invention;

FIG. 3 is a schematic diagram of the structure of the area array frequency dividing output end according to the present invention.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and provides a detailed implementation manner and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

The grazing incidence of broadband terahertz waves (grazing incidence refers to the propagation of light from an optically sparser medium to an optically denser medium, and the incident angle is close to 90 degrees is grazing) enters the input port of the frequency divider, and then enters the multi-channel tubular output channel. The Hertzian wave performs F-P resonance in the tubular channel, and finally multiple terahertz signals with different main frequencies are output from multiple round tubular output ports. The output channel ports can be distributed in the form of linear array or area array in space.

The terahertz main frequency divided by the different output channels is regulated by the inner diameter of the corresponding output channel, and the specific corresponding relationship is:

Among them, f is the terahertz main frequency output by a certain output channel port, d is the inner diameter of the corresponding cylindrical output channel, c is the speed of light in vacuum, 3×10 ⁸ m/s; θ is the incident terahertz wave into the input The angle between the inside of the port and the normal to the inner wall of the channel. Figure 1 is a schematic diagram of the input port structure. The main frequency f of the FP resonance only depends on the inner diameter d of the cylindrical output channel, and θ is the angle between the incident terahertz wave and the normal line of the inner wall. 86.5°.

Figure 2 is a schematic diagram of the frequency division structure of a tubular channel-type terahertz linear array. The terahertz transmitting antenna 1 is used to generate broadband terahertz waves at the input port of the frequency divider 2, and the broadband terahertz waves are arranged in the frequency divider 2 through the linear array. The different circular tubular output channels of the output port are output, and the output terahertz signals of different main frequencies are detected by a plurality of receiving antennas 3 facing the output port. According to the above formula, the inner diameters of different structures correspond to different main frequency outputs. When the required frequencies are 1.2THz, 0.7THz and 0.2THz, it can be calculated by the formula, and the required inner diameters of the output ports are 1.025mm, 1.756mm and 6.15mm respectively. After processing the frequency divider structure with these parameters, the on-demand frequency division of the terahertz signal can be realized.

Figure 3 is a schematic diagram of the output terminal of the area array frequency division. Compared with the linear array frequency division, when the inner diameter of the output port remains unchanged, only the spatial position of the output port needs to be rearranged, and the two terahertz signals can be realized. Dimensional plane frequency division.

The material used for the tubular channel terahertz frequency divider is basically not limited, as long as it is conducive to structural processing, such as non-metallic materials such as plastic and plexiglass.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (5)

1. A tubular channel type terahertz frequency divider based on Fabry-Perot resonance is characterized in that the tubular channel type terahertz frequency divider is of an input multi-output circular tubular channel structure, broadband terahertz waves enter an input port of the terahertz frequency divider in a grazing incidence mode and then enter a plurality of paths of circular tubular output channels, the terahertz waves are subjected to Fabry-Perot resonance in the tubular channels, and a plurality of terahertz signals with different main frequencies are output through a plurality of circular tubular output ports.

2. The Fabry-Perot resonance-based tubular channel type terahertz frequency divider according to claim 1, wherein the diameter of the circular tubular output channel is determined by the size of terahertz main frequency needing to be divided, and the terahertz signal main frequency output by the circular tubular output port is as follows:

wherein, f is terahertz main frequency output by a certain output channel port, d is the inner diameter of the corresponding circular tubular output channel, and c is the light velocity in vacuum; theta is an included angle between the terahertz wave incident into the input port and the normal line of the inner wall of the channel.

3. The tubular channel terahertz frequency divider based on Fabry-Perot resonance as claimed in claim 1 or 2, wherein the output channel ports are not limited in space to be distributed in a linear array form or an area array form.

4. The tubular channel-type terahertz frequency divider based on Fabry-Perot resonance according to claim 3, wherein the terahertz frequency divider is manufactured by processing a channel structure inside a homogeneous massive non-metal material.

5. A frequency division method for broadband terahertz waves is characterized in that broadband terahertz waves enter an input port in a grazing incidence mode, the input port is divided into at least 2 tubular channels to be output, the terahertz waves carry out Fabry-Perot resonance in the tubular channels, terahertz waves with different main frequencies are output corresponding to output channels with different pipe diameters, and the relationship between the output terahertz wave main frequency f and the diameter d of the output channels is as follows:

wherein c is the speed of light in vacuum; theta is an included angle between the terahertz wave incident into the input port and the normal line of the inner wall of the channel.

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