CN102928929B - Terahertz wave polarizing beam splitter with three triangular structures - Google Patents

Abstract

The invention discloses a terahertz wave polarization beam splitter with three triangular structures. It includes a signal input terminal, a first signal output terminal, a second signal output terminal, a first straight waveguide, a second straight waveguide, a third straight waveguide, a fourth straight waveguide, a first arc-shaped waveguide, and a second arc-shaped waveguide. waveguide, first equilateral triangular waveguide, second equilateral triangular waveguide, third equilateral triangular waveguide. The terahertz wave is input from the signal input end, the first signal output end outputs the TE wave, and the second signal output end outputs the TM wave, so as to obtain the function of polarization beam splitting. The terahertz wave polarizing beam splitter with three triangular structures of the present invention has the advantages of simple structure, high beam splitting ratio, small size, low cost, and easy manufacture.

Description

The terahertz polarization beam splitter of three triangular structures

Technical field

The present invention relates to beam splitter, relate in particular to a kind of terahertz polarization beam splitter of three triangular structures.

Background technology

THz wave or be called the Terahertz ray from the eighties of last century middle and later periods eighties just by definite designation, scientists is referred to as far ir ray before this.THz wave refer to frequency at 0.1THz ~ 10THz(wavelength at 30 μ m ~ 3mm) electromagnetic wave of scope, between microwave and infrared between.In fact, at 1896 and 1897, Rubens and Nichols just related to this wave band, and infrared spectrum arrives 9 μ m and 20 μ m, and the record that arrives 50 μ m is arranged again afterwards.The last 100 years time afterwards, far-infrared technique has been obtained many achievements, and industrialization.But the result of study and the data that relate to terahertz wave band are considerably less, be mainly to be subject to the restriction that effective Terahertz produces source and sensitive detector, so this wave band is also referred to as the Terahertz gap.Along with the development of development, particularly ultrafast technology of the eighties in last century series of new techniques, new material, obtaining the stable pulse THz source in broadband becomes a kind of accurate routine techniques, and Terahertz Technology is developed rapidly.With microwave, with infrared, compare, THz wave has the characteristic of a lot of uniquenesses: low energy, coherence, transient state, transmittance etc. make it all have broad application prospects in fields such as imaging, medical diagnosis, communication, astronomy.Current radio communication broadband can't meet the demand of people to high-rate wireless communication, because THz wave can reach 10Gb/s on wireless transmission speed, than more than thousand times of the fast hundreds of to of current broadband technology, therefore researching and developing the terahertz wave band wireless communication system can meet the demand of Future Information society to the ultra broadband two-forty effectively, has broad application prospects and actual value.

Terahertz polarization beam splitter is very important THz wave device in the THz wave communication system, at present lot of domestic and international scientific research institution all is devoted to the research of terahertz polarization beam splitter and makes some progress, but these device transmissivities are lower, complex structure, cost is high, volume is large, be difficult to making.Therefore be necessary to design a kind of simple in structure, the terahertz polarization beam splitter that size is little, beam splitting efficiency is high is to meet following THz wave communication technology application needs.

Summary of the invention

The objective of the invention is in order to overcome the prior art transmissivity lower, complex structure, actual fabrication process difficulty, the deficiency that cost is higher, provide a kind of terahertz polarization beam splitter of three triangular structures of high beam splitting rate.

In order to achieve the above object, technical scheme of the present invention is as follows:

The terahertz polarization beam splitter of three triangular structures comprises signal input part, first signal output terminal, secondary signal output terminal, the first straight wave guide, the second straight wave guide, the 3rd straight wave guide, the 4th straight wave guide, the first circular arc waveguide, the second circular arc waveguide, the first equilateral triangle waveguide, the second equilateral triangle waveguide, the triangle waveguide of C grade limit; The right-hand member of the first straight wave guide is connected to the first circular arc waveguide lower extreme point; The first equilateral triangle waveguide, the second equilateral triangle waveguide, the triangle waveguide of C grade limit share a summit, and are connected with the upper end of the first circular arc waveguide; Half of one side of the first equilateral triangle waveguide is as a limit of the second equilateral triangle waveguide, and half of the another side of the second equilateral triangle waveguide is as a limit of C grade limit triangle waveguide; The upper end of the second circular arc waveguide is connected on one side of the first equilateral triangle waveguide, and the lower end of the second circular arc waveguide is connected to the right-hand member of the second straight wave guide; The left end of the second straight wave guide is connected on the 3rd straight wave guide; The 4th straight wave guide is placed on the upper right side of the second circular arc waveguide; THz wave is from the input of THz wave input end, and the TE ripple, from the output of first signal output terminal, TM ripple from the output of secondary signal output terminal, obtains the function of polarization beam splitting.

The length of described the first straight wave guide is 280 ~ 300 μ m, and width is 35 ~ 40 μ m, is highly 30 ~ 35 μ m; The length of described the second straight wave guide is 90 ~ 100 μ m, and width is 35 ~ 40 μ m, is highly 30 ~ 35 μ m; The length of described the 3rd straight wave guide is 180 ~ 200 μ m, and width is 35 ~ 40 μ m, is highly 30 ~ 35 μ m; The length of described the 4th straight wave guide is 280 ~ 300 μ m, and width is 35 ~ 40 μ m, is highly 30 ~ 35 μ m.The internal diameter of described the first circular arc waveguide is 270 ~ 280 μ m, and external diameter is 300 ~ 310 μ m, and right central angle is 6 °-~ 10 °; The internal diameter of described the second circular arc waveguide is 270 ~ 280 μ m, and external diameter is 300 ~ 310 μ m, and right central angle is 310 ° ~ 315 °.The interior length of side of described the first equilateral triangle waveguide is 180 ~ 190 μ m, and the outer length of side is 210 ~ 220 μ m.The interior length of side of described the second equilateral triangle waveguide is 90 ~ 95 μ m, and the outer length of side is 105 ~ 110 μ m.The interior length of side of described C grade limit triangle waveguide is 90 ~ 95 μ m, and the outer length of side is 105 ~ 110 μ m.Distance between described the 4th straight wave guide and the second circular arc waveguide is 20 ~ 30 μ m.The material of described the first straight wave guide, the second straight wave guide, the 3rd straight wave guide, the 4th straight wave guide, the first circular arc waveguide, the second circular arc waveguide, the first equilateral triangle waveguide, the second equilateral triangle waveguide, the triangle waveguide of C grade limit is silicon.

The terahertz polarization beam splitter of three triangular structures of the present invention has simple in structure, and the beam splitting rate is high, and size is little, and cost is low, is convenient to the advantages such as making.

The accompanying drawing explanation

Fig. 1 is the two dimensional surface schematic diagram of the terahertz polarization beam splitter of three triangular structures;

Fig. 2 is TE ripple, the TM ripple output power curve of first signal output terminal of the terahertz polarization beam splitter of three triangular structures;

Fig. 3 is TM ripple, the TE ripple output power curve of secondary signal output terminal of the terahertz polarization beam splitter of three triangular structures.

Embodiment

As shown in Figure 1, the terahertz polarization beam splitter of three triangular structures comprises signal input part 1, first signal output terminal 2, secondary signal output terminal 3, the first straight wave guide 4, the second straight wave guide 5, the 3rd straight wave guide 6, the 4th straight wave guide 7, the first circular arc waveguide 8, the second circular arc waveguide 9, the first equilateral triangle waveguide 10, the second equilateral triangle waveguide 11, C grade limit triangle waveguide 12; The right-hand member of the first straight wave guide 4 is connected to the first circular arc waveguide 8 lower extreme points; The first equilateral triangle waveguide 10, the second equilateral triangle waveguide 11, C grade limit triangle waveguide 12 share a summit, and are connected with the upper end of the first circular arc waveguide 8; Half of one side of the first equilateral triangle waveguide 10 is as a limit of the second equilateral triangle waveguide 11, and half of the another side of the second equilateral triangle waveguide 10 is as a limit of C grade limit triangle waveguide 12; The upper end of the second circular arc waveguide 9 is connected on one side of the first equilateral triangle waveguide 10, and the lower end of the second circular arc waveguide 9 is connected to the right-hand member of the second straight wave guide 5; The left end of the second straight wave guide 5 is connected on the 3rd straight wave guide 6; The 4th straight wave guide 7 is placed on the upper right side of the second circular arc waveguide 9; THz wave is from 1 input of THz wave input end, and the TE ripple, from 2 outputs of first signal output terminal, TM ripple from 3 outputs of secondary signal output terminal, obtains the function of polarization beam splitting.

The length of described the first straight wave guide 4 is 280 ~ 300 μ m, and width is 35 ~ 40 μ m, is highly 30 ~ 35 μ m; The length of described the second straight wave guide 5 is 90 ~ 100 μ m, and width is 35 ~ 40 μ m, is highly 30 ~ 35 μ m; The length of described the 3rd straight wave guide 6 is 180 ~ 200 μ m, and width is 35 ~ 40 μ m, is highly 30 ~ 35 μ m; The length of described the 4th straight wave guide 7 is 280 ~ 300 μ m, and width is 35 ~ 40 μ m, is highly 30 ~ 35 μ m.The internal diameter of described the first circular arc waveguide 8 is 270 ~ 280 μ m, and external diameter is 300 ~ 310 μ m, and right central angle is 6 °-~ 10 °; The internal diameter of described the second circular arc waveguide 9 is 270 ~ 280 μ m, and external diameter is 300 ~ 310 μ m, and right central angle is 310 ° ~ 315 °.The interior length of side of described the first equilateral triangle waveguide 10 is 180 ~ 190 μ m, and the outer length of side is 210 ~ 220 μ m.The interior length of side of described the second equilateral triangle waveguide 11 is 90 ~ 95 μ m, and the outer length of side is 105 ~ 110 μ m.The interior length of side of described C grade limit triangle waveguide 12 is 90 ~ 95 μ m, and the outer length of side is 105 ~ 110 μ m.Distance between described the 4th straight wave guide 7 and the second circular arc waveguide 9 is 20 ~ 30 μ m.The material of described the first straight wave guide 4, the second straight wave guide 5, the 3rd straight wave guide 6, the 4th straight wave guide 7, the first circular arc waveguide 8, the second circular arc waveguide 9, the first equilateral triangle waveguide 10, the second equilateral triangle waveguide 11, C grade limit triangle waveguide 12 is silicon.

embodiment 1

The terahertz polarization beam splitter of three triangular structures:

The length of the first straight wave guide is 280 μ m, and width is 40 μ m, is highly 30 μ m; The length of the second straight wave guide is 90 μ m, and width is 40 μ m, is highly 30 μ m; The length of the 3rd straight wave guide is 200 μ m, and width is 40 μ m, is highly 30 μ m; The length of the 4th straight wave guide is 300 μ m, and width is 40 μ m, is highly 30 μ m.The internal diameter of the first circular arc waveguide is 270 μ m, and external diameter is 310 μ m, and right central angle is 6 °; The internal diameter of the second circular arc waveguide is 270 μ m, and external diameter is 310 μ m, and right central angle is 310 °.The interior length of side of the first equilateral triangle waveguide is 190 μ m, and the outer length of side is 220 μ m.The interior length of side of the second equilateral triangle waveguide is 95 μ m, and the outer length of side is 110 μ m.The interior length of side of C grade limit triangle waveguide is 95 μ m, and the outer length of side is 110 μ m.Distance between the 4th straight wave guide and the second circular arc waveguide is 20 μ m.The material of the first straight wave guide, the second straight wave guide, the 3rd straight wave guide, the 4th straight wave guide, the first circular arc waveguide, the second circular arc waveguide, the first equilateral triangle waveguide, the second equilateral triangle waveguide, the triangle waveguide of C grade limit is silicon.The TE ripple of first signal output terminal, TM ripple output power curve are as shown in Figure 2, in 0.4 ~ 0.95THz band limits, the minimum transfer of TE ripple goes out maximum transmitted that power is 99.4%, TM ripple, and to go out power be 0.36%, and this explanation TE ripple is exported from the first signal output terminal.The TM ripple of secondary signal output terminal, TE ripple output power curve as shown in Figure 3, in 0.4 ~ 0.95THz band limits, the TM minimum output power be 99.5%, TE ripple maximum transmitted to go out power be 0.45%, this explanation TM ripple is exported from the secondary signal output terminal.

Claims (8)

1. A terahertz wave polarization beam splitter with three triangular structures, characterized in that it includes a signal input end (1), a first signal output end (2), a second signal output end (3), a first straight waveguide (4), the second straight waveguide (5), the third straight waveguide (6), the fourth straight waveguide (7), the first arc-shaped waveguide (8), the second arc-shaped waveguide (9), the first Equilateral triangular waveguide (10), second equilateral triangular waveguide (11), third equilateral triangular waveguide (12); the right end of the first straight waveguide (4) is connected to the lower endpoint of the first circular arc waveguide (8) ; The first equilateral triangular waveguide (10), the second equilateral triangular waveguide (11), and the third equilateral triangular waveguide (12) share a vertex and are connected to the upper end of the first arc-shaped waveguide (8); One half of one side of the equilateral triangular waveguide (10) is used as a side of the second equilateral triangular waveguide (11), and the other half of the first equilateral triangular waveguide (10) is used as the third equilateral triangular waveguide (12) One side of the second arc-shaped waveguide (9) is connected to the third side of the first equilateral triangular waveguide (10), and the lower end of the second arc-shaped waveguide (9) is connected to the second straight waveguide ( 5); the left end of the second straight waveguide (5) is connected to the third straight waveguide (6); the fourth straight waveguide (7) is placed on the upper right of the second arc-shaped waveguide (9); the signal input end (1) is located at the left end of the first straight waveguide (4), the first signal output terminal (2) is located at the right end of the fourth straight waveguide (7), and the second signal output terminal (3) is located at the third straight waveguide (6) ), the terahertz wave is input from the terahertz wave input terminal (1), the TE wave is output from the first signal output terminal (2), and the TM wave is output from the second signal output terminal (3). Function. 2. A terahertz wave polarization beam splitter with three triangular structures according to claim 1, characterized in that the length of the first straight waveguide (4) is 280-300 μm, and the width is 35-40 μm, The height is 30~35 μm; the length of the second straight waveguide (5) is 90~100 μm, the width is 35~40 μm, and the height is 30~35 μm; the length of the third straight waveguide (6) is 180~ 200 μm, a width of 35-40 μm, and a height of 30-35 μm; the length of the fourth straight waveguide (7) is 280-300 μm, a width of 35-40 μm, and a height of 30-35 μm. 3. A terahertz wave polarization beam splitter with three triangular structures according to claim 1, characterized in that the inner diameter of the first arc-shaped waveguide (8) is 270-280 μm, and the outer diameter is 300 μm ~310μm, the opposite central angle is 6°~10°; the inner diameter of the second arc-shaped waveguide (9) is 270~280μm, the outer diameter is 300~310μm, and the opposite central angle is 310°~ 315°. 4. A terahertz wave polarization beam splitter with three triangular structures according to claim 1, characterized in that the inner side length of the first equilateral triangular waveguide (10) is 180-190 μm, and the outer side length is It is 210~220μm. 5. A terahertz wave polarization beam splitter with three triangular structures according to claim 1, characterized in that the inner side length of the second equilateral triangular waveguide (11) is 90-95 μm, and the outer side length is It is 105~110μm. 6. A terahertz wave polarization beam splitter with three triangular structures according to claim 1, characterized in that the inner side length of the third equilateral triangular waveguide (12) is 90-95 μm, and the outer side length is It is 105~110μm. 7. A terahertz wave polarization beam splitter with three triangular structures according to claim 1, characterized in that the gap between the fourth straight waveguide (7) and the second arc-shaped waveguide (9) The distance is 20~30μm. 8. A terahertz wave polarization beam splitter with three triangular structures according to claim 1, characterized in that the first straight waveguide (4), the second straight waveguide (5), and the third straight waveguide (6), the fourth straight waveguide (7), the first circular arc waveguide (8), the second circular arc waveguide (9), the first equilateral triangular waveguide (10), the second equilateral triangular waveguide (11 ), the material of the third equilateral triangular waveguide (12) is silicon.

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