CN103105643A - Twin-core photonic crystal fiber terahertz wave filter with adjustable voltage - Google Patents
Twin-core photonic crystal fiber terahertz wave filter with adjustable voltage Download PDFInfo
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- CN103105643A CN103105643A CN2013100693655A CN201310069365A CN103105643A CN 103105643 A CN103105643 A CN 103105643A CN 2013100693655 A CN2013100693655 A CN 2013100693655A CN 201310069365 A CN201310069365 A CN 201310069365A CN 103105643 A CN103105643 A CN 103105643A
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Abstract
The invention relates to a twin-core photonic crystal fiber terahertz wave filter with adjustable voltage. The twin-core photonic crystal fiber terahertz wave filter comprises cladding and fiber cores, wherein the cladding consists of a plastic material and air holes in triangular periodic arrangement, two air holes at the center of the cladding are taken as the fiber cores, the radius of the two air holes in the fiber cores is greater than that of the air holes in periodic arrangement in the cladding, the two air holes of the fiber cores are filled with nematic liquid crystal which is sensitive to voltage, the material of the cladding is polyethylene which is easy to obtain and has the refractive index being 1.5, and the nematic liquid crystal which is filled in the two air holes of the fiber cores is nematic liquid crystal 5CB. The terahertz photonic crystal fiber wave filter provided by the invention can solve the problem that the transmission characteristic of a conventional photonic crystal fiber cannot be changed after the photonic crystal fiber is manufactured, can flexibly control the adjustable transmission characteristic of the photonic crystal fiber without changing a photonic crystal fiber structure, and improves the sensitivity.
Description
(1) technical field
The present invention relates to the adjustable double-core photonic crystal fiber terahertz waveguide of a kind of Hollow-Core Photonic Crystal Fibers wave filter, particularly a kind of voltage.
(2) technical background
THz wave refer to frequency 0.1THZ between 10THZ, the electromagnetic wave of wavelength between 0.03mm-3mm.It is overlapping in long-wave band and millimeter wave, and short-wave band and infrared ray have overlapping.The residing specific position of THZ ripple makes the THZ technology become the bridge of connecting electronic and photonics, has very important science and using value.Because THz wave is very large in the loss of free space, so the THz devices take waveguide as the basis is the key that can THz wave widespread use.
Photonic crystal fiber is a kind of novel optical fiber, compares ordinary optic fibre, and photonic crystal fiber has many good qualities: as without the unimodular property, low loss characteristic of cut-off, dispersion characteristics etc. flexibly.According to the difference of core material, photonic crystal fiber can be divided into Hollow-Core Photonic Crystal Fibers and solid light photonic crystal fiber.And the geometric parameters such as the radius by changing the photonic crystal fiber airport, pitch of holes can change the transport property of photonic crystal fiber flexibly.
The material of normal optical photonic crystal fiber is quartzy, and the loss of quartz in the THz wave transmission is very large, so common photonic crystal fiber is difficult to as terahertz waveguide.People had developed the polytetrafluoroethylplastic plastic photonic crystal fiber as terahertz waveguide afterwards, and photonic crystal fiber has been extended to terahertz wave band.The Plastic Photonic Crystal with the high concentration of polyethylene made in succession occurred again, be used for terahertz wave band and shown the characteristic of low-loss with relative low dispersion.Be used for the structural parameters of photonic crystal fiber of terahertz waveguide in the mm magnitude, more easily prepare with respect to the photonic crystal fiber of visible light or infrared band.
Just can't change again its transport property after photonic crystal fiber in the past completes, but need to adjust according to demand transport property in practical application.So in order to save Production Time and cost, be necessary to study the photonic crystal fiber terahertz waveguide that a kind of structure that need not change photonic crystal fiber just can change its transport property.
(3) summary of the invention
The present invention is directed to the problem of above-mentioned existence, provide a kind of voltage adjustable double-core photonic crystal fiber THz wave wave filter, the terahertz light photonic crystal fiber wave filter that the present invention makes can solve and just can't change the problem of its transport property after in the past photonic crystal fiber completes again, the present invention need not to change photonic crystals optical fiber structure, just its transport property can be controlled flexibly adjustable, and single cored structure more in the past, twin-core structure of the present invention has improved sensitivity.
The double-core photonic crystal fiber THz wave wave filter that voltage provided by the invention is adjustable, comprise covering and fibre core, described covering is comprised of plastic material and the airport with triangular shaped periods arrangement, two airports of covering central authorities are as fibre core, in fibre core, the radius of two airports greater than the radius of the airport of periodic arrangement in covering, is filled the nematic liquid crystal to voltage-sensitive in two airports of fibre core.
The material of covering is the tygon that easily obtains, and refractive index is 1.5.The nematic liquid crystal of filling in two airports of fibre core is nematic liquid crystal 5CB, and in the time of 25 ℃, the refractive index of the refractive index of the non-ordinary light of 5CB liquid crystal and ordinary light is respectively 1.77 and 1.58, and the refractive index of liquid crystal is greater than the refractive index of covering.
Radius r=the 0.25mm of covering hollow pore, airport spacing L=1.25mm, the diameter d=0.8mm of two airports in fibre core.
Working mechanism of the present invention:
By controlling the operating voltage of liquid crystal, just can change the effective refractive index of liquid crystal, thereby control flexibly the communication mode of optical fiber, effective mode field area and zero dispersion range.
Advantage of the present invention is:
1) in the fibre core of double-core photonic crystal fiber after filling liquid crystal, leaded light mechanism has been transformed into total reflection by the band gap effect of complexity.
2) due to the liquid crystal susceptibility of condition to external world, thus just can change the transport property of this terahertz waveguide by the impressed voltage of controlling liquid crystal, and need not to change the geometry of optical fiber.
3) adopt twin-core structure, Terahertz in fibre core in transmitting procedure between twin-core coupled transfer, reduced intermode dispersion, have sensitivity preferably.
4) use voltage as controlled condition, avoided the impact of the conditions such as ambient temperature on transport property.
5) the double-core photonic crystal fiber material used before filling liquid crystal is the tygon that easily obtains, and its structural parameters are in the mm magnitude, more easily prepares than the photonic crystal fiber of common quartz material.
(4) description of drawings
Fig. 1 is terahertz light photonic crystal fiber model cross section structure schematic diagram,
In figure: 1. tygon covering, the 2. airport of periodic arrangement, 3. two airports of filling liquid crystal in fibre core, wherein: airport spacing Λ=1.25mm, the diameter d=0.8mm of two airports in fibre core.
Fig. 2 is that the effective refractive index of terahertz light photonic crystal fiber is with the change curve of voltage.
Effective mode field area of Fig. 3 terahertz light photonic crystal fiber is with the change curve of voltage.
(5) embodiment
Describe the adjustable double-core photonic crystal fiber THz wave wave filter of voltage provided by the present invention in detail below by embodiment.But those skilled in the art will appreciate that within the scope of the claims, can make in form and the multiple modification on details.Therefore the present invention never only limits to the embodiment of the following stated.
Embodiment:
As shown in Figure 1, the double-core photonic crystal fiber THz wave wave filter that voltage is adjustable comprises covering and fibre core, and covering 1 is comprised of plastic material and the airport 2 with triangular shaped periods arrangement.Two airports of covering central authorities are as fibre core 3, and the radius r of airport 2 is 0.25mm, airport spacing Λ=1.25mm, two airport diameter d=0.8mm in fibre core.Fill the nematic liquid crystal 5CB to voltage-sensitive in two airports of fibre core, during filling, the molecule long axis direction is along fiber axis direction.
Covering plastic material used is tygon, and refractive index is 1.5.And the refractive index of the light of propagating under this filling mode is the ordinary refractive index of liquid crystal.The operating voltage of liquid crystal is 0-30V.0.2---the ordinary refractive index scope of liquid crystal is 1.55-1.65 in the frequency range of 1.0THz and in this voltage range, and greater than cladding index, light is limited in propagating in fibre core.
Simulate frequency at 0.625THz with finite element software, temperature range is the effective refractive index variation with temperature curve of 25 ℃-34 ℃, as Fig. 2, can find out the rising with voltage, and effective refractive index has dropped to 1.555 from 1.588.Obtain equally effective mode field area with the change in voltage curve, as Fig. 3, can find out that mode field area reduces along with the rising of voltage.
Claims (4)
1. double-core photonic crystal fiber THz wave wave filter that voltage is adjustable, comprise covering and fibre core, it is characterized in that described covering is comprised of plastic material and the airport with triangular shaped periods arrangement, two airports of covering central authorities are as fibre core, in fibre core, the radius of two airports greater than the radius of the airport of periodic arrangement in covering, is filled the nematic liquid crystal to voltage-sensitive in two airports of fibre core.
2. the adjustable double-core photonic crystal fiber THz wave wave filter of voltage according to claim 1, is characterized in that the material of described covering is the easy tygon that obtains, and refractive index is 1.5.
3. the adjustable double-core photonic crystal fiber THz wave wave filter of voltage according to claim 1, it is characterized in that the nematic liquid crystal of filling in two airports of described fibre core is nematic liquid crystal 5CB, in the time of 25 ℃, the refractive index of the refractive index of the non-ordinary light of 5CB liquid crystal and ordinary light is respectively 1.77 and 1.58, and the refractive index of liquid crystal is greater than the refractive index of covering.
4. the adjustable double-core photonic crystal fiber THz wave wave filter of according to claim 1,2 or 3 described voltages, radius r=the 0.25mm that it is characterized in that the airport of periodic arrangement in described covering, airport spacing L=1.25mm, the diameter d=0.8mm of two airports in fibre core.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424899A (en) * | 2013-07-09 | 2013-12-04 | 哈尔滨工程大学 | Photonic crystal fiber tunable filtering beam splitter and manufacturing method thereof |
| CN103645535A (en) * | 2013-12-11 | 2014-03-19 | 江苏大学 | High double-refraction terahertz optical fiber |
| CN105137530A (en) * | 2015-09-07 | 2015-12-09 | 合肥工业大学 | Photonic crystal optical fiber wave filter |
| CN106019648A (en) * | 2016-05-27 | 2016-10-12 | 哈尔滨理工大学 | Filter of tunable terahertz metamaterial and preparation method thereof based on low-voltage-driven liquid crystal material |
| CN108692827A (en) * | 2018-04-08 | 2018-10-23 | 东北大学 | A kind of automatically controlled tuning type long period photonic crystal fiber grating temperature sensor |
| CN110501308A (en) * | 2019-09-27 | 2019-11-26 | 南开大学 | Terahertz micro-structure twin-core fiber hypersensitive microfluid sensor |
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| CN1687808A (en) * | 2005-04-22 | 2005-10-26 | 南开大学 | Air conducting double-core photon band gap optical fiber |
| CN102162876A (en) * | 2011-05-23 | 2011-08-24 | 天津理工大学 | Adjustable photonic crystal optical fiber terahertz waveguide |
| CN102590931A (en) * | 2012-02-28 | 2012-07-18 | 天津理工大学 | Temperature adjustable terahertz wave filter for photonic crystal fiber |
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| CN1687808A (en) * | 2005-04-22 | 2005-10-26 | 南开大学 | Air conducting double-core photon band gap optical fiber |
| CN102162876A (en) * | 2011-05-23 | 2011-08-24 | 天津理工大学 | Adjustable photonic crystal optical fiber terahertz waveguide |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424899A (en) * | 2013-07-09 | 2013-12-04 | 哈尔滨工程大学 | Photonic crystal fiber tunable filtering beam splitter and manufacturing method thereof |
| CN103645535A (en) * | 2013-12-11 | 2014-03-19 | 江苏大学 | High double-refraction terahertz optical fiber |
| CN103645535B (en) * | 2013-12-11 | 2015-08-26 | 江苏大学 | A kind of high birefringence Hz optical fiber |
| CN105137530A (en) * | 2015-09-07 | 2015-12-09 | 合肥工业大学 | Photonic crystal optical fiber wave filter |
| CN106019648A (en) * | 2016-05-27 | 2016-10-12 | 哈尔滨理工大学 | Filter of tunable terahertz metamaterial and preparation method thereof based on low-voltage-driven liquid crystal material |
| CN106019648B (en) * | 2016-05-27 | 2019-02-12 | 哈尔滨理工大学 | A kind of tunable Terahertz Meta Materials filter and preparation method thereof based on low voltage drive liquid crystal material |
| CN108692827A (en) * | 2018-04-08 | 2018-10-23 | 东北大学 | A kind of automatically controlled tuning type long period photonic crystal fiber grating temperature sensor |
| CN110501308A (en) * | 2019-09-27 | 2019-11-26 | 南开大学 | Terahertz micro-structure twin-core fiber hypersensitive microfluid sensor |
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Application publication date: 20130515 |