CN102879914A

CN102879914A - Combed terahertz polarization beam splitter

Info

Publication number: CN102879914A
Application number: CN2012103792056A
Authority: CN
Inventors: 李九生
Original assignee: China Jiliang University
Current assignee: China Jiliang University
Priority date: 2012-10-09
Filing date: 2012-10-09
Publication date: 2013-01-16
Anticipated expiration: 2032-10-09
Also published as: CN102879914B

Abstract

The invention discloses a combed terahertz polarization beam splitter which comprises a signal input end, a first polarizer, a second polarizer, a third polarizer, first polarization films, second polarization films, a first signal output end and a second signal output end. The first polarizer, the second polarizer and the third polarizer are all formed by periodically and alternately arraying the first polarization films and the second polarization films, the first polarizer and the third polarizer are symmetrically distributed on the upper side and the lower side of the second polarizer, and starting points of the first polarizer and the third polarizer are arrayed on the midpoint of the initial first polarization film on the second polarizer. Signals are inputted through the signal input end by a 45-degree incident angle to pass through the first polarizer, the second polarizer and the third polarizer, the first signal output end outputs TM (transverse magnetic) waves, and the second signal output end outputs TE (transverse electromagnetic) waves to obtain the polarization beam splitting property. The combed terahertz polarization beam splitter has the advantages of simple structure, high beam splitting rate, low cost, convenience in manufacturing and the like.

Description

The pectination terahertz polarization beam splitter

Technical field

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

Background technology

The THz wave science and technology has obtained the extensive concern of international academic community now, and in recent years, the research institution about THz wave emerges in multitude in the world, and has obtained a lot of achievements in research.The function element of current THz wave is the Focal point and difficult point during the THz wave science and technology is used, and the function element research for THz wave both at home and abroad also launches gradually.Existing THz wave function element also seldom, their complex structures, volume are larger, expensive usually, so miniaturization, the THz wave device is the key that the THz wave technology is used cheaply.

The research for THz wave both at home and abroad mainly concentrates on THz wave generation and the detection technique, for the also gradually expansion of function element research of THz wave.The function element of THz wave is the Focal point and difficult point during the THz wave science and technology is used.Existing THz wave device has THz wave to produce and pick-up unit, the THz wave transmission waveguide, but these device architectures are complicated, volume is larger and expensive, so miniaturization, the THz wave device is the key that the THz wave technology is used cheaply.Lot of domestic and international scientific research institution all is devoted to the research of this respect and makes some progress at present, but to the rare report of the research of pectination terahertz polarization beam splitter.The pectination terahertz polarization beam splitter is a kind of very important THz wave device, can be used for the THz wave system, realizes the control to THz wave.Therefore be necessary to design a kind of simple in structure, the terahertz polarization beam splitter that beam splitting efficient is high is used needs to satisfy following THz wave technology.

Summary of the invention

The present invention is lower in order to overcome the prior art transmissivity, complex structure, and actual fabrication process difficulty, the deficiency that cost is higher provides a kind of pectination terahertz polarization beam splitter of high beam splitting rate.

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

The pectination terahertz polarization beam splitter comprises signal input part, first polarizer, second polarizer, the 3rd polarizer, the first polarization film, the second polarization film, first signal output terminal, secondary signal output terminal; First polarizer, second polarizer, the 3rd polarizer forms by the first polarization film and the second polarization film periodicity alternative arrangement, first polarizer and the 3rd polarizer are symmetrically distributed in respectively the upper of second polarizer, lower both sides, the starting point of first polarizer and the 3rd polarizer is arranged in the mid point of first the first polarization film on second polarizer, signal is inputted with 45 ° of incident angles from signal input part, through first polarizer, second polarizer, the 3rd polarizer, first signal output terminal output TM ripple, secondary signal output terminal output TE ripple obtains the polarization beam splitting performance.

The refractive index of described the first polarization film is greater than the refractive index of the second polarization film, and the length d of the first polarization film and the second polarization film equates, is 40 μ m ~ 50 μ m.Described the first polarization film and the second polarization film periodically the cycle a of alternative arrangement are 30 μ m ~ 40 μ m; The width b of the first polarization film is 5 μ m ~ 10 μ m, and the c width of the second polarization film is 20 μ m ~ 30 μ m.The first polarization film of arranging in described first polarizer and the 3rd polarizer and the second polarization film number equate, are 50 ~ 80.

Pectination terahertz polarization beam splitter 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.

Description of drawings:

Fig. 1 is pectination terahertz polarization beam splitter synoptic diagram;

Fig. 2 is the sizing specification figure of polarizer;

Fig. 3 is the first signal output terminal TM wave reflection rate curve of pectination terahertz polarization beam splitter;

Fig. 4 is the first signal output terminal TE wave reflection rate curve of pectination terahertz polarization beam splitter;

Fig. 5 is the secondary signal output terminal TM ripple transmittance graph of pectination terahertz polarization beam splitter;

Fig. 6 is the secondary signal output terminal TE ripple transmittance graph of pectination terahertz polarization beam splitter.

Embodiment

As shown in Figure 1, the pectination terahertz polarization beam splitter comprises signal input part 1, first polarizer 2, second polarizer 3, the 3rd polarizer 4, the first polarization film 5, the second polarization film 6, first signal output terminal 7, secondary signal output terminal 8; First polarizer 2, second polarizer 3, the 3rd polarizer 4 forms by the first polarization film 5 and the second polarization film 6 periodicity alternative arrangements, first polarizer 2 and the 3rd polarizer 4 are symmetrically distributed in respectively the upper of second polarizer 3, lower both sides, the starting point of first polarizer 2 and the 3rd polarizer 4 is arranged in the mid point of first the first polarization film 5 on second polarizer 3, signal is inputted with 45 ° of incident angles from signal input part 1, through first polarizer 2, second polarizer 3, the 3rd polarizer 4, first signal output terminal 7 output TM ripples, secondary signal output terminal 8 output TE ripples obtain the polarization beam splitting performance.

The refractive index of described the first polarization film 5 is greater than the refractive index of the second polarization film 6, and the length d of the first polarization film 5 and the second polarization film 6 equates, is 40 μ m ~ 50 μ m.Described the first polarization film 5 and the second polarization film 6 periodically the cycle a of alternative arrangement are 30 μ m ~ 40 μ m; The width b of the first polarization film 5 is 5 μ m ~ 10 μ m, and the c width of the second polarization film 6 is 20 μ m ~ 30 μ m.The first polarization film 5 of arranging in described first polarizer 2 and the 3rd polarizer 4 and the second polarization film (6) number equate, are 50 ~ 80.

Embodiment 1

The pectination terahertz polarization beam splitter:

Signal is inputted with 45 ° of incident angles from signal input part.The refractive index of the first polarization film is greater than the refractive index of the second polarization film, and the refractive index of the first polarization film is that the refractive index of 3.42, the second polarization films is that the length d of 1.48, the first polarization films and the second polarization film equates, is 50 μ m.The first polarization film and the second polarization film periodically the cycle a of alternative arrangement are 30 μ m; The width b of the first polarization film is 10 μ m, and the width c of the second polarization film is 20 μ m.The first polarization film and the second polarization film number of arranging in first polarizer and the 3rd polarizer equate, are 50.Pectination terahertz polarization beam splitter first signal output terminal TM wave reflection rate curve as shown in Figure 3, in frequency was 0.25THz ~ 0.65 THz scope, the maximum reflectivity of TM ripple was 99.9%.Pectination terahertz polarization beam splitter first signal output terminal TE wave reflection rate curve as shown in Figure 4, in frequency was 0.25THz ~ 0.65 THz scope, the maximum reflectivity of TE ripple was 0.12%.Pectination terahertz polarization beam splitter secondary signal output terminal TM ripple transmittance graph as shown in Figure 5, in frequency was 0.25THz ~ 0.65 THz scope, the maximum transmission rate of TM ripple was 0.1%.Pectination terahertz polarization beam splitter secondary signal output terminal TE ripple transmittance graph as shown in Figure 6, in frequency was 0.25THz ~ 0.65 THz scope, the maximum transmission rate of TE ripple was 99.88%.This explanation TM ripple is exported from the first signal output terminal through reflection, and the transmission of TE ripple process has reached the purpose of beam splitting from the output of secondary signal output terminal.

Claims

1. a pectination terahertz polarization beam splitter is characterized in that comprising signal input part (1), first polarizer (2), second polarizer (3), the 3rd polarizer (4), the first polarization film (5), the second polarization film (6), first signal output terminal (7), secondary signal output terminal (8); First polarizer (2), second polarizer (3), the 3rd polarizer (4) forms by the first polarization film (5) and the second polarization film (6) periodicity alternative arrangement, first polarizer (2) is symmetrically distributed in respectively the upper of second polarizer (3) with the 3rd polarizer (4), lower both sides, the starting point of first polarizer (2) and the 3rd polarizer (4) is arranged in the mid point of first the first polarization film (5) on second polarizer (3), signal is inputted with 45 ° of incident angles from signal input part (1), through first polarizer (2), second polarizer (3), the 3rd polarizer (4), first signal output terminal (7) output TM ripple, secondary signal output terminal (8) output TE ripple obtains the polarization beam splitting performance.

2. a kind of pectination terahertz polarization beam splitter according to claim 1, it is characterized in that the refractive index of described the first polarization film (5) is greater than the refractive index of the second polarization film (6), the length d of the first polarization film (5) and the second polarization film (6) equates, is 40 μ m ~ 50 μ m.

3. a kind of pectination terahertz polarization beam splitter according to claim 1 is characterized in that the cycle a of described the first polarization film (5) and the second polarization film (6) periodicity alternative arrangement is 30 μ m ~ 40 μ m; The width b of the first polarization film (5) is 5 μ m ~ 10 μ m, and the c width of the second polarization film (6) is 20 μ m ~ 30 μ m.

4. a kind of pectination terahertz polarization beam splitter according to claim 1, it is characterized in that the first polarization film (5) and the second polarization film (6) number of arranging in described first polarizer (2) and the 3rd polarizer (4) equate, are 50 ~ 80.