CN102830461A - 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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- CN102830461A CN102830461A CN2012103584119A CN201210358411A CN102830461A CN 102830461 A CN102830461 A CN 102830461A CN 2012103584119 A CN2012103584119 A CN 2012103584119A CN 201210358411 A CN201210358411 A CN 201210358411A CN 102830461 A CN102830461 A CN 102830461A
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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 is meant that frequency is in 0.1THz between the 10THz, wavelength at 30 μ m to the electromagnetic wave between the 3mm.It is the transition field of electronics to photonics between microwave and infrared radiation.Because the residing special Wave spectral position of THz wave; Make it have the advantageous characteristic of perspectivity, security, high spectral signal-noise ratio; Have important science and using value, be widely used in technical fields such as object image-forming, spectral analysis, medical diagnosis, material analysis test and radio communication.We can say that Terahertz Technology not only is in important academic standing in scientific research, and the development and the national defense safety construction of national generation information industry had the important strategic meaning.
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 practicability function element that satisfies the requirement of different application field.Press for function elements such as waveguide, switch, modulation, filtering, coupling in numerous application systems such as radio communication, multispectral imaging, radar, safety check.Yet; The specific position of THz wave in electromagnetic wave spectrum presents the peculiar property that is different from microwave and light wave when having determined THz wave and matter interaction; Make Terahertz Technology when bringing many advantages; Also make ripe photoelectron technology and microwave technology receive very big restriction in the application of terahertz wave band, therefore be directed against the concrete characteristics of THz wave, the function element of development of practicalization is one of significant challenge of being faced of Terahertz scientific technological advance.
Because the water in air steam has intense absorption to THz wave, so the Terahertz function element that is the basis with the low-loss terahertz waveguide becomes the Terahertz Technology development key.The low-loss terahertz waveguide of relatively being paid close attention at present mainly contains metal wire waveguide, hollow polymer photon crystal fiber, polyalcohol stephanoporate optical fiber.Because photonic crystal fiber and porous optical fiber structural design are more flexible; Geometric parameters such as radius that can be through changing optical fiber hollow pore, pitch of holes are realized the function that the conventional waveguide structure can't be accomplished, and are that the basis makes up and realize that the Terahertz function element becomes a kind of more satisfactory selection with the microstructured optical fibers therefore.
Summary of the invention
The objective of the invention is in technical fields such as Terahertz tunable filtering and switch, to have potential using value for the porous terahertz band gap fiber of a kind of low-loss, wide bandwidth of operation, automatically controlled tunable, stable performance is provided.
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 a plastic polymer; Its fibre core is to be made up of the airport that is the triangular crystal lattice arrangement; Covering is to constitute by being the composite air hole that triangular crystal lattice and honeycomb lattice arrange, and is in the covering in the airport that triangular crystal lattice arranges to have filled the nematic liquid crystal to electric field-sensitive.Through the electric field around the control optical fiber; 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 control optical fiber, and then realize function the tunable filtering and the switch of THz wave.
Be the distance lambda between adjacent two airports that triangular crystal lattice arranges in the said 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
1The distance in the fibre core between adjacent two airports and the diameter of airport are respectively Λ
2And d
2
The base material of said optical fiber is a high density polyethylene, and refractive index is 1.534.The liquid crystal of filling in the 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 composite air hole covering to constitute; In covering, select to fill nematic liquid crystal to electric field-sensitive; Through the electric field around the control optical fiber, change the refractive index of liquid crystal, thereby change the effective refractive index of fibre cladding; Realization is to the modulation of optical fiber transmission property and transmission spectral line, and then reaches functions such as the tunable filtering of THz wave and switches.This optical fiber also has advantages such as broadband operation, low transmission loss.
Description of drawings
The cross-sectional structure synoptic diagram of the automatically controlled tunable porous belts pbg fiber of Fig. 1.
Fig. 2 optical fiber bandgap range and basic mode effective refractive index 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 that is made up of base material 1 and composite air hole 2,3, and porous fibre core 4 compositions, and fibre core is to be made up of the porous structure that 19 airports form.Be the airport spacing Λ that triangular crystal lattice is arranged in the 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
1Fibre core air pitch of holes and diameter and airport 2 are consistent.Having filled nematic liquid crystal 5CB in the airport 3, when filling liquid crystal, in advance the airport surface has been handled, injected some active agents, is the direction that is parallel to optical axis with the direction grappling of liquid crystal molecule.
The base material of optical fiber is a high density polyethylene, and refractive index is 1.534.The refractive index of air is 1.The liquid crystal of filling in the covering is 5CB, and its refractive index is along with the orientation of liquid crystal molecule changes, and when liquid crystal molecular orientation was parallel to the optical axis direction, it showed 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.Because the fibre core effective refractive index is lower than the effective refractive index of covering, optical fiber is based on the transmission mechanism of photon band gap, and 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 analogue simulation.Like Fig. 2-shown in Figure 4, as can be seen from the figure, be in the fibre core airport at most energy of band gap central authorities guided mode, thereby reduced the absorption loss of fiber-based bottom material effectively guided mode.
It is the transmission spectrum calculated curve of 8cm optical fiber that Fig. 5 has provided length, and as can be seen from the figure, when forwarding the direction of vertical optical axis along with liquid crystal molecule to from being parallel to the optical axis direction, mind-set low frequency direction moves in the transmission spectrum of optical fiber, and bandwidth narrows down.Therefore, can utilize this characteristic to realize 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 was parallel to the optical axis direction, most of energy of guided mode was 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 the covering, can't form conduction mode.Therefore, can utilize this characteristic to realize switching function to THz wave.
Claims (5)
1. automatically controlled tunable porous terahertz band gap fiber; The base material of optical fiber is a plastic polymer; Its fibre core is to be made up of the airport that is the triangular crystal lattice arrangement; Covering is to constitute by being the composite air hole that triangular crystal lattice and honeycomb lattice arrange, and is in the covering in the airport that triangular crystal lattice arranges to have filled the nematic liquid crystal to electric field-sensitive.
2. automatically controlled tunable porous terahertz band gap fiber according to claim 1, the base material that it is characterized in that said optical fiber is a 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 the covering is nematic liquid crystal 5CB, the normal light of liquid crystal and very optical index be respectively 1.53 and 1.75.
4. automatically controlled tunable porous terahertz band gap fiber according to claim 1 is characterized in that the fibre core of optical fiber is made up of the porous structure that 19 airports constitute, and covering is to be made up of the composite air hole that is the trigonometric sum honeycomb lattice.
5. automatically controlled tunable porous terahertz band gap fiber according to claim 1 is characterized in that being in the covering airport spacing Λ that triangular crystal lattice is arranged
1=295 μ m, the airport diameter d
1=0.33 Λ
1Be the airport spacing that honeycomb lattice is arranged
The airport diameter d
2=0.55 Λ
1Fibre core air pitch of holes and diameter are respectively Λ
2And d
2
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249441A (en) * | 2016-09-22 | 2016-12-21 | 北京大学 | Graphene porous optical fiber electrooptic modulator |
| 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 |
| CN110850523A (en) * | 2019-12-10 | 2020-02-28 | 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788695A (en) * | 2009-09-16 | 2010-07-28 | 北京航空航天大学 | High-birefringence sub-wavelength porous T-Hz optical fiber |
| CN102122022A (en) * | 2010-12-15 | 2011-07-13 | 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 |
-
2012
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788695A (en) * | 2009-09-16 | 2010-07-28 | 北京航空航天大学 | High-birefringence sub-wavelength porous T-Hz optical fiber |
| CN102122022A (en) * | 2010-12-15 | 2011-07-13 | 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 |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106249441A (en) * | 2016-09-22 | 2016-12-21 | 北京大学 | Graphene porous optical fiber electrooptic modulator |
| CN106249441B (en) * | 2016-09-22 | 2019-01-11 | 北京大学 | Graphene porous optical fiber electrooptic modulator |
| 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 |
| CN110850523A (en) * | 2019-12-10 | 2020-02-28 | 厦门大学 | Full-wave mixed spectrum element method-based liquid crystal filled photonic crystal fiber analysis method |
| 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 |
| WO2024104676A1 (en) * | 2022-11-16 | 2024-05-23 | Asml Netherlands B.V. | A broadband radiation source |
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| CN102830461B (en) | 2013-12-25 |
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