CN102830461B - Electric control tunable porous terahertz band gap optical fiber - Google Patents
Electric control tunable porous terahertz band gap optical fiber Download PDFInfo
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- CN102830461B CN102830461B CN 201210358411 CN201210358411A CN102830461B CN 102830461 B CN102830461 B CN 102830461B CN 201210358411 CN201210358411 CN 201210358411 CN 201210358411 A CN201210358411 A CN 201210358411A CN 102830461 B CN102830461 B CN 102830461B
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Abstract
The invention discloses an electric control tunable porous terahertz band gap optical fiber. The substrate of the optical fiber is made of a plastic polymer; a fiber core of the optical fiber is composed of air holes arranged in a triangular lattice manner; the coating layer of the optical fiber is formed by composite air holes arranged in a triangular lattice and honeycomb lattice manner; and a nematic phase liquid crystal which is sensitive to an electric field is filled in the air holes arranged in the triangular lattice manner in the coating layer. With the adoption of the electric control tunable type porous terahertz band gap optical fiber, the direction of liquid crystal molecules is changed by controlling an electric field around the optical fiber, so as to change the refractive index of the liquid crystal, and therefore, the band gap property, the conduction mode, the transmission property and the transmission spectral line of the optical fiber can be controlled, and the functions of tunable filtering, switching and the like of terahertz waves can be realized; and furthermore, most guided mode energy is limited in the air holes of the fiber core, so that the absorption consumption of the substrate material on the guided mode energy can be effectively reduced.
Description
Technical field
The present invention relates to a kind of plastic polymer porous optical fiber, particularly a kind of automatically controlled tunable porous terahertz band gap fiber.
Background technology
THz wave refer to frequency in 0.1THz between 10THz, wavelength at 30 μ m to the electromagnetic wave between 3mm.It is the Transitional of electronics to photonics between microwave and infrared radiation.Due to the residing special Wave spectral position of THz wave, make it there is the advantageous characteristic of perspectivity, security, high spectral signal-noise ratio, there is important science and using value, be widely used in the technical fields such as object imaging, spectral analysis, medical diagnosis, material analysis test and radio communication.Can say Terahertz Technology not only in scientific research in important academic standing, and development and the national defense safety construction of national generation information industry had to important strategic importance.
Terahertz emission source and ripe detection technique are the most important condition that promotes the Terahertz Technology development efficiently, but the widespread use of Terahertz Technology be unable to do without the support of the practical function element that meets the requirement of different application field.In numerous application systems such as radio communication, multispectral imaging, radar, safety check in the urgent need to function elements such as waveguide, switch, modulation, filtering, couplings.Yet, the specific position of THz wave in electromagnetic wave spectrum presents the peculiar property that is different from microwave and light wave while having determined THz wave and matter interaction, make Terahertz Technology when bringing many advantages, also make ripe photoelectron technology and microwave technology be very restricted in the application of terahertz wave band, therefore for the concrete characteristics of THz wave, the function element of development of practical is one of significant challenge of facing of Terahertz scientific technological advance.
Because the water in air steam has strong absorption to THz wave, therefore take the low-loss terahertz waveguide, become the key of Terahertz Technology development as basic Terahertz function element.More concerned low-loss terahertz waveguide mainly contains metal wire waveguide, hollow polymer photon crystal fiber, polyalcohol stephanoporate optical fiber at present.Due to photonic crystal fiber and the porous optical fiber structural design more flexible, the geometric parameters such as radius that can be by changing optical fiber hollow pore, pitch of holes are realized the function that the conventional waveguide structure can't complete, and the microstructured optical fibers of therefore take builds and realize that the Terahertz function element becomes a kind of more satisfactory selection as basis.
Summary of the invention
The objective of the invention is, for the porous terahertz band gap fiber of a kind of low-loss, wide bandwidth of operation, automatically controlled tunable, stable performance is provided, in the technical fields such as Terahertz tunable filtering and switch, to there is potential using value.
Technical scheme of the present invention is: a kind of automatically controlled tunable porous terahertz band gap fiber, the base material of optical fiber is plastic polymer, its fibre core is to consist of the airport that is the triangular crystal lattice arrangement, covering is to form by being the compound air pore that triangular crystal lattice and honeycomb lattice arrange, and is in covering in the airport that triangular crystal lattice arranges and has filled the nematic liquid crystal to electric field-sensitive.By controlling optical fiber electric field on every side, change the orientation of liquid crystal molecule, thereby change the refractive index of liquid crystal, reach band gap properties, conduction mode, transport property and the transmission spectral line of controlling optical fiber, and then realize the function to tunable filtering and the switch of THz wave.
Be the distance lambda between adjacent two airports that triangular crystal lattice arranges in described covering
1=295 μ m, the diameter d of airport
1=0.33 Λ
1, be the distance between adjacent two airports that honeycomb lattice arranges
the diameter d of airport
2=0.55 Λ
1.Distance in fibre core between adjacent two airports and the diameter of airport are respectively Λ
2and d
2.
The base material of described optical fiber is high density polyethylene, and refractive index is 1.534.The liquid crystal of filling in covering is 5CB, and normal light and very optical index be respectively 1.53 and 1.75.
Advantage of the present invention and good effect are: the photonic band gap optical fiber that adopts porous fibre core and compound air pore covering to form, the nematic liquid crystal of Selective filling to electric field-sensitive in covering, by controlling optical fiber electric field on every side, change the refractive index of liquid crystal, thereby change the effective refractive index of fibre cladding, the modulation of realization to optical fiber transmission property and transmission spectral line, and then reach functions such as the tunable filtering of THz wave and switches.This optical fiber also has the advantages such as broadband operation, low transmission loss.
The accompanying drawing explanation
The cross-sectional structure schematic diagram of the automatically controlled tunable porous belts pbg fiber of Fig. 1.
Fig. 2 optical fiber bandgap range and effective index of fundamental mode are with the change curve of frequency.
Energy mark in Fig. 3 fibre core airport is with the change curve of frequency.
The absorption loss of Fig. 4 base material is with the change curve of frequency.
The change curve of the transmission versus frequency of Fig. 5 optical fiber.
Fig. 6 liquid-crystal refractive-index and optical fiber transmissivity are with the change curve of liquid crystal molecular orientation.
Embodiment
As shown in Figure 1, optical fiber is the covering consisted of base material 1 and compound air pore 2,3, and porous fibre core 4 compositions, and fibre core is that the porous structure formed by 19 airports forms.Be the airport spacing Λ that triangular crystal lattice is arranged in covering
1=295 μ m, the airport diameter d
1=0.33 Λ
1, be the airport spacing that honeycomb lattice is arranged
the airport diameter d
2=0.55 Λ
1.Fibre core Air pitch of holes and diameter and airport 2 are consistent.Having filled nematic liquid crystal 5CB in airport 3, in advance the airport surface has been processed when filling liquid crystal, injected some active agents, is the direction that is parallel to optical axis by the direction grappling of liquid crystal molecule.
The base material of optical fiber is high density polyethylene, and refractive index is 1.534.The refractive index of air is 1.The liquid crystal of filling in covering is 5CB, and its refractive index is along with the orientation of liquid crystal molecule changes, and when liquid crystal molecular orientation is parallel to the optical axis direction, it shows as the normal light characteristic, and refractive index is 1.53; When liquid crystal molecular orientation, during perpendicular to the optical axis direction, it shows as improper light characteristic, and refractive index is 1.75.Due to the effective refractive index of fibre core effective refractive index lower than covering, the transmission mechanism of optical fiber based on photon band gap, the guided mode energy is transmitted in the porous fibre core by local.
With plane wave expansion method and finite element method, band gap properties, the energy mark in the fibre core airport, loss characteristic, the transmissivity of optical fiber have been carried out to analogue simulation.As shown in Fig. 2-Fig. 4, as can be seen from the figure, at most energy of band gap central authorities guided mode in the fibre core airport, thereby effectively reduced the absorption loss of optical fiber base material to guided mode.
Fig. 5 has provided the transmission spectrum calculated curve that length is 8cm optical fiber, and as can be seen from the figure, while along with liquid crystal molecule, from being parallel to the optical axis direction, forwarding the direction of vertical optical axis to, in the transmission spectrum of optical fiber, mind-set low frequency direction moves, and bandwidth narrows down.Therefore, can utilize this characteristic to realize the tunable filtering function to THz wave.
Fig. 6 has provided change curve and the corresponding mould field distribution thereof that liquid-crystal refractive-index and optical fiber transmissivity turn to liquid crystal molecule.As can be seen from the figure, when liquid crystal molecule is parallel to the optical axis direction, most of energy of guided mode is transmitted in the fibre core air by local, along with liquid crystal molecule turns to the direction perpendicular to optical axis, the energy of guided mode is diffused into rapidly in covering, can't form conduction mode.Therefore, can utilize this characteristic to realize the switching function to THz wave.
Claims (3)
1. an automatically controlled tunable porous terahertz band gap fiber, the base material of optical fiber is plastic polymer, the porous structure that its fibre core consists of 19 airports that are the triangular crystal lattice arrangement forms, covering is to consist of the compound air pore that is triangular crystal lattice and honeycomb lattice arrangement, be in covering in the airport that triangular crystal lattice arranges and filled the nematic liquid crystal to electric field-sensitive, be the airport spacing Λ that triangular crystal lattice is arranged in covering
1=295 μ m, the airport diameter d
1=0.33 Λ
1; Be the airport spacing that honeycomb lattice is arranged
the airport diameter d
2=0.55 Λ
1; Fibre core Air pitch of holes and diameter are respectively Λ
2and d
2.
2. automatically controlled tunable porous terahertz band gap fiber according to claim 1, the base material that it is characterized in that described optical fiber is high density polyethylene, refractive index is 1.534.
3. automatically controlled tunable porous terahertz band gap fiber according to claim 1, is characterized in that the liquid crystal of filling in covering is nematic liquid crystal 5CB, the normal light of liquid crystal and very optical index be respectively 1.53 and 1.75.
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| CN 201210358411 CN102830461B (en) | 2012-09-25 | 2012-09-25 | Electric control tunable porous terahertz band gap optical fiber |
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| CN 201210358411 CN102830461B (en) | 2012-09-25 | 2012-09-25 | Electric control tunable porous terahertz band gap optical fiber |
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| CN102830461B true CN102830461B (en) | 2013-12-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249441B (en) * | 2016-09-22 | 2019-01-11 | 北京大学 | Graphene porous optical fiber electrooptic modulator |
| CN108692827B (en) * | 2018-04-08 | 2020-07-24 | 东北大学 | Electric control tuning type long-period photonic crystal fiber grating temperature sensor |
| CN110850523B (en) * | 2019-12-10 | 2020-10-23 | 厦门大学 | Full-wave mixed spectrum element method-based liquid crystal filled photonic crystal fiber analysis method |
| EP4372462A1 (en) * | 2022-11-16 | 2024-05-22 | ASML Netherlands B.V. | A broadband radiation source |
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| CN101788695B (en) * | 2009-09-16 | 2011-11-09 | 北京航空航天大学 | High-birefringence sub-wavelength porous T-Hz optical fiber |
| CN102122022B (en) * | 2010-12-15 | 2013-05-08 | 江苏大学 | Terahertz 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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