CN102289032A - Terahertz photonic crystal fiber coupler - Google Patents
Terahertz photonic crystal fiber coupler Download PDFInfo
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- CN102289032A CN102289032A CN2011102849870A CN201110284987A CN102289032A CN 102289032 A CN102289032 A CN 102289032A CN 2011102849870 A CN2011102849870 A CN 2011102849870A CN 201110284987 A CN201110284987 A CN 201110284987A CN 102289032 A CN102289032 A CN 102289032A
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Abstract
The invention discloses a Terahertz photonic crystal fiber coupler which comprises a cladding and fiber cores. Three fiber cores are formed by being surrounded by inner layer air holes (3) positioned at the vertexes of a regular hexagon, wherein a first fiber core (4) is positioned at the center position of a host material (1); a second fiber core (5) and a third fiber core (6) are symmetrically positioned at both sides of the first fiber core (4); a network formed by outer layer air holes (2) is positioned around the inner layer air holes and distances between adjacent outer layer air holes are equal; the first fiber core (4) serves as an input end; the second fiber core (5) and the third fiber core (6) serve as output ends; the inner layer air holes (3) and the outer layer air holes (2) have the same hole period lambda; and the relationship between a diameter d1 of each outer layer air hole (2) and a diameter d2 of each inner layer air hole (3) meets the following formula that d1 is more than or equal to d2. The Terahertz photonic crystal fiber coupler has the advantages that the Terahertz photonic crystal fiber coupler works in a wide wavelength range, outputs stably, has low transmission loss and polarization dependent loss and the like.
Description
Technical field
The present invention relates to the Terahertz transmission technology, relate in particular to a kind of Terahertz coupling mechanism based on optical fiber structure.
Background technology
Terahertz (Terahertz, be called for short THz) ripple between microwave and the infrared band, is meant that frequency is 30 ~ 3000 μ m at 0.1 ~ 10 THz(wavelength in electromagnetic wave spectrum) electromagnetic wave (1 THz=10 in the scope
12Hz).THz wave all plays an important role at aspects such as high data rate communication, spectrum of use, medical science and biological detections.THz wave is very easily absorbed by dielectric material, is 4.3 cm as polymethylmethacrylate (PMMA) absorption loss when 0.5 THz
-1High density polyethylene (HDPE) in the absorption loss of 0.1～3THz wave band less than l cm
-1, be better than polymethylmethacrylate; And the lower teflon (Teflon) of absorption loss, the absorption loss when 1 THz (being that wavelength is 300 microns) has still reached 0.3 cm
-1(promptly about 130 dB/m) [G. Masahiro, et al. " Teflon Photonic Crystal Fiber as Terahertz Waveguide(teflon Terahertz photon crystal fiber guide); " Japanese Journal of Applied Physics, 2004,43 (2B), L317-L319].
Optical fiber directional coupler can be realized a branch of light is divided into two bundle or several Shu Guang, is a kind of optical passive component commonly used.A kind of fairly simple Hz optical fiber coupler structure is to lean on two ordinary optic fibres very near, thereby make THz wave be coupled to another root optical fiber [A. Dupuis from an optical fiber, et al., " making of Fabrication and THz loss measurements of porous subwavelength fibers using a directional coupler method(Terahertz sub-wavelength optical fiber and employing directional coupler are measured the research of its loss); " Optics Express, 2009,17 (10), 8012-8028].The advantage of this coupled fiber is that THz wave has a big chunk energy to transmit outside optical fiber, thereby reduces the absorption of material to the Terahertz energy, has reduced its loss.Yet this coupled fiber structural instability is difficult to the degree of control energy coupling, and causes scattering loss easily.People such as Kristian Nielsen propose a kind of Hz optical fiber directional coupler [K. Nielsen, et al. " Broadband terahertz fiber directional coupler(broadband Hz optical fiber directional coupler); " Optics Letters, 2010,35 (17), 2879-2881], by in two fibre cores of double-core photonic crystal fiber, introducing a plurality of little airports, can realize the coupling in broadband.But nearly 20 cm of the length of this optical fiber, for the THz wave that is very easily absorbed by medium, its length is long.For example, establishing host material is Teflon, and its absorption loss when 300 micron wave lengths is 130 dB/m, and then THz wave is through behind this device, and gross energy will be attenuated 26 dB.Therefore, length that should strict control coupling mechanism, thereby excessive energy loss when avoiding THz wave in coupling mechanism, to transmit.
Compare with near infrared light, the wavelength of THz wave is much longer, therefore, has the Terahertz coupling mechanism of broad bandwidth of operation, will have superiority in actual applications.So can either in the bandwidth range of broad, work, have low loss again, be the basic demand of Hz optical fiber coupling mechanism practical application.
Summary of the invention
The purpose of this invention is to provide a kind of Terahertz photonic crystal optical fiber coupler of realizing low-loss, wide bandwidth work, stable performance.
Technical scheme of the present invention is: a kind of Terahertz photonic crystal optical fiber coupler, comprise covering and fibre core, described fibre core is three, form by the inner air hole encirclement that is positioned at the regular hexagon summit, wherein first fibre core is by being positioned at the host material center, second fibre core and the 3rd fibre core symmetry be positioned at the described first fibre core both sides; Described covering is made up of outer air hole, inner air hole and host material beyond the fibre core, and a plurality of described outer air hole surrounds network outside described inner air hole, and equidistant between the adjacent described outer air hole; Described first fibre core is an input end, and described second fibre core and the 3rd fibre core are output terminal; The length of fiber coupler equals the coupling length of fibre core basic mode; The hole cycle in described inner air hole and outer air hole
ΛIdentical, the diameter in described outer air hole
d 1 Diameter with the inner air hole
d 2 Between relation satisfy
d 1 〉=
d 2
Further, the diameter in described outer air hole
d 1 Diameter with the inner air hole
d 2 Satisfy
d 1 =
d 2 =
d, and satisfy
D/ Λ〉=0.5,0.5 λ≤
Λ≤ 1.2 λ, wherein λ is the wavelength of the THz wave of transmission.
Further, the diameter in described outer air hole
d 1 Diameter with the inner air hole
d 2 Satisfy
d 1 d 2 , and satisfy
d 2 / Λ≤ 0.5,
d 1 / Λ〉=1.2-
d 2 / Λ, 0.5 λ≤
Λ≤ λ.
Technique effect of the present invention is: the photonic crystals optical fiber structure that adopts three fibre cores to form, by selecting suitable structural parameters, not only can realize the function of beam split at extremely short fiber lengths, also have advantages such as wide wavelength coverage work, two output terminal output energy coincidences, Polarization Dependent Loss is low.This optical fiber structure is simple, manufacture craft maturation, stable performance.
Description of drawings
Fig. 1 is the cross-sectional structure synoptic diagram of Hz optical fiber coupling mechanism;
The mould field variation diagram of Fig. 2 THz wave in three core coupling mechanisms;
Fig. 3 is the change curve of optical fiber coupling length with the hole cycle;
The constraint loss of the photonic crystal fiber of single fibre core was with the change in hole cycle when Fig. 4 was three layers for airport
Change curve;
Fig. 5 is an optical fiber
xThe coupling length of polarized light is with the inner air bore dia
d 2Change curve;
The cross-sectional structure synoptic diagram of Fig. 6 twin-core coupling mechanism;
Fig. 7 twin-core coupling mechanism inserts loss with the wavelength change curve;
Insertion loss among Fig. 8 embodiment 1 and Polarization Dependent Loss are with the wavelength change curve;
Insertion loss among Fig. 9 embodiment 2 and Polarization Dependent Loss are with the wavelength change curve;
Wherein: 1-host material, 2-outer air hole, 3-inner air hole, 4-first fibre core, 5-second fibre core, 6-the 3rd fibre core.
Embodiment
As shown in Figure 1, optical fiber is made up of host material 1 and the outer air hole 2 and the inner air hole 3 that are arranged on the regular grid, optical fiber has three fibre cores, promptly is positioned at first fibre core 4 of host material 1 center, and symmetry arrangement is at second fibre core 5 and the 3rd fibre core 6 of the first fibre core both sides.Three fibre cores are formed by an airport that lacks in the regular grid.THz wave is imported from middle fibre core, and from the output of both sides fibre core, the length of fiber coupler equals the coupling length of fibre core basic mode.
When THz wave is imported from first fibre core 4, THz wave will be carried out periodic energy and be shifted in three fibre cores.Be that THz wave will be transferred to the both sides fibre core gradually, get back to first fibre core 4 then again.Therefore, if the length of fiber coupler is taken as its basic mode coupling length, then, will export from the both sides fibre core from the THz wave of first fibre core, 4 inputs.Fig. 2 (a) (b) (c) represents respectively in transmission range to being 0,
L c/ 2,
L cThe time the distribution plan of mould field,
L cRepresent the coupling length of basic mode, promptly the figure THz wave shifts (Fig. 2 (b)) to second fibre core 5 and the 3rd fibre core 6 gradually, and finally transfers to second fibre core 5 and the 3rd fibre core 6 (Fig. 2 (c)) fully from 4 inputs (Fig. 2 (a)) of first fibre core.Because the symmetry of optical fiber, the energy of exporting from the both sides fibre core is identical, has good consistance.Because this symmetric output when the THz wave of different wave length is imported, only can have the difference of output energy size, and the energy size of two ends output is the same.
The diameter of definition airport is
dAnd outer air hole 2 diameters
d 1 With inner air hole 3 diameters
d 2 Satisfy
d 1 =
d 2 =
d, the spacing at the center, hole in two adjacent holes, promptly the hole cycle is
ΛFor effectively reducing the absorption of host material to THz wave, to reveal under the less prerequisite at Assured Mode, the length of coupling mechanism should be enough little.Implementation method is to get the less hole cycle
ΛTo obtain short coupling length and bigger normalization bore dia
d/
ΛTo reduce the constraint loss of transmission mode.The hole cycle can not be too small, otherwise constraint loss meeting is very big, and core size also can be very little simultaneously, thereby be unfavorable for THz wave is incorporated in the optical fiber.Being specially requirement is: the airport diameter
dWith the hole cycle
ΛShould satisfy
D/ Λ〉=0.5,0.5 λ≤
Λ≤ 1.2 λ.Here λ is the wavelength of the THz wave of transmission.
Because THz wave is very easily absorbed by medium, and the optical fiber coupling length is big more, energy loss is big more.Though under identical hole cycle prerequisite, the airport diameter is more little, its coupling length is also short more, the problem that little airport also can bring the constraint loss to increase.When the wavelength that Fig. 3 has provided THz wave was 300 μ m, the coupling length of optical fiber was with the change curve in hole cycle.Because the relation of constraint loss, optical fiber can realize that effectively the coupling length of work has lower limit, because the hole cycle is more little, covering is weak more to the constraint ability of pattern, and the constraint loss of pattern is also just big more.Therefore, only provided coupling length curve under the situation that can realize effective low-loss transmission (certainly, coupling length does not have the upper limit theoretically, and therefore, what coupling length can also be than among the figure is longer) among the figure.As can be seen from the figure, the different normalization bore dia of correspondence
D/ ΛThe time, the shortest coupling length that optical fiber can reach is different.As can be seen from Figure 3, the optical fiber coupling length is with the hole cycle
ΛIncrease and increase; When
D/ ΛWhen value increased, curve was offset left among the figure, and promptly optical fiber can reach shorter coupling length.When Fig. 4 had provided airport and is three layers, the constraint loss of the photonic crystal fiber during single fibre core was with the change curve in hole cycle.When the normalization diameter of airport hour, need work under the cycle in bigger hole, just have low constraint loss.And under identical constraint loss required, its coupling length was different.For example, when the constraint loss of pattern all is 1 dB/m,
D/ Λ=0.3,0.5 and the coupling length of the pattern of 0.7 correspondence be respectively 7.40 cm, 3.05 cm, 1.27 cm.Therefore, as seen, under same constraint loss requires, when the normalization diameter of airport is big, can reach shorter Mode Coupling length.The present invention is that (the normalization diameter is big more certainly by adopting the bigger airport of normalization diameter to fetter light, the coupling length of pattern also can be long more), and when utilizing the normalization diameter of airport big, the desirable littler hole cycle of optical fiber, thereby reduce coupling length, and guarantee effectively transmission.It can also be seen that from Fig. 3, little after to a certain degree when the hole cycle, reduce the hole cycle again, reducing of its coupling length is just not obvious.
Length was at the low-loss coupling mechanism of centimetre magnitude when above method can obtain operation wavelength and is 300 μ m.If will further improve the loss characteristic of coupling mechanism, then have certain difficulty.Because the method that reduces coupling length here is for reducing the hole cycle; Simultaneously, reveal, need to increase the normalization diameter of airport for avoiding pattern.And in fact the increase of the normalization diameter of airport except reducing pattern constraint loss, also can cause the increase of its coupling length.This be because: the increase of the normalization diameter of airport, in fact be exactly the refringence that has increased covering and fibre core, thereby strengthened the constraint ability of airport, THz wave is concentrated to fibre core, reduced the overlapping region between each fibre core pattern, thereby coupling length is increased.Simultaneously, because energy mainly is to concentrate on the host material district, the fibre core pattern is that gap location positive energy exchange, the realization by hole between the fibre core is coupled.Thereby, the reducing of hole cycle, itself has also reduced the gap width in hole between the fibre core; And after the increase of the normalization diameter of airport, it is narrower that the gap becomes, thereby the coupling between the fibre core also becomes more difficult.Like this, by reducing the method that the hole cycle reduces coupling length, certain limit is arranged.
By the mode field theory, the effective refractive index of photonic crystal fiber pattern depends primarily on the parameter in its fibre core surrounding air hole, and constraint light is mainly played in the outside air hole.Therefore, the method for the airport of the innermost layer that we can be by reducing to surround fibre core reduces the coupling length of optical fiber, increases the leakage that fibre core outer air hole reduces light simultaneously, thereby obtains coupling mechanism with shorter length.
Therefore change the structure of fiber coupler, make the diameter in outer air hole 2
d 1Diameter with inner air hole 3
d 2Relation satisfy
d 1 d 2THz wave is from 4 inputs of first fibre core, and from the output of both sides fibre core, fiber lengths equals the coupling length of fibre core basic mode.
The normalization diameter in inner air hole
d 1 / ΛLess, and the normalization diameter in outer air hole
d 2 / ΛBigger.Less owing to the inner air hole like this, its constraint ability to pattern in the fibre core dies down, and the mode field that transmits in the fibre core is outwards expanded often, thereby the mode field overlapping region between the fibre core increases; Simultaneously, the airport between the fibre core also diminishes, thereby also more helps coupling between modes.Like this, its coupling length shortens.On the other hand, owing to reducing of inner air hole, the constraint loss meeting of optical fiber increases, and at this moment, can reduce loss by the diameter that increases the outer air hole.Therefore, different with preceding a kind of scheme, this programme obtains short Mode Coupling length by adopting little airport normalization diameter and little hole cycle, and the method for the normalization diameter by increasing fibre core outer air hole has been avoided the leakage of THz wave effectively simultaneously.
It is to be noted, and two airports that cannot directly only reduce between the fibre core reduce coupling length, because can destroy the symmetry of the index distribution of fibre core like this, thereby cause the distortion of mode field and the generation of fiber birefringence, the quality of the THz wave of influence output.
Scheme as optimizing requires fiber outer layer airport 2 diameters
d 1, fibre core inner air hole 3 diameters
d 2, the hole cycle
ΛBetween satisfy:
d 2 / Λ≤ 0.5,
d 1 / Λ〉=1.2-
d 2 / Λ, 0.5 λ≤
Λ≤ λ.Be that the hole cycle is less and inner air hole 3 is also less, thereby reduce coupling length effectively; And outer air hole 2 needs enough greatly, and inner air hole 3 is more little, and outer air hole 2 requires big more, could fetter THz wave effectively like this.
Fig. 5 represents to work as
d 1 d 2 The time, optical fiber
xThe coupling length of polarized light is with the inner air bore dia
d 2Change curve.Here the wavelength of THz wave is 300 μ m, the hole cycle
Λ=200 μ m.The diameter in the corresponding outer air of dotted line hole wherein
d 1 / Λ=0.85 o'clock result.And solid line is represented the diameter in outer air hole
d 1Diameter with the inner air hole
d 2When equating, the change curve of coupling length.Article two, curve is at the diameter in inner air hole
d 2Overlap finely when big, this size that also proves the outer air hole is very little to the influence of coupling length.It can also be seen that from figure when the outer air hole was big, the optical fiber coupling length can reach below 0.6 cm; And when the inner air hole was identical with the outer air bore dia, the optical fiber interval of solid line part in the drawings can be realized low-loss coupling, and coupling length is bigger.Therefore, the diameter variation in outer air hole, influence is very little to the coupling length of optical fiber, and its effect to the enhancing of the constraint ability of THz wave is significant.
Following examples all are host material with the teflon, and its absorption loss is 130 dB/m, and the material refractive index is 1.5.Here the insertion loss that to introduce a parameter be optical fiber, i.e. the energy of the monolateral end of fiber coupler output number percent measures with decibel (dB), promptly inserts loss and is:
In the formula
IThe insertion loss of expression optical fiber,
P o The monolateral terminal output energy of expression fiber coupler,
P i Expression incident wave gross energy.Get and insert loss and be its bandwidth of operation less than the wavelength coverage of 3.4 dB.
Embodiment one:
Get outer air hole 2 diameters
d 1 With inner air hole 3 diameters
d 2 Satisfy
d 1 =
d 2 =
dGetting optical fiber parameter is: the hole cycle
Λ=240 μ m, the airport diameter
d=144 μ m.At wavelength
λDuring=300 μ m, obtain it
xThe coupling length of polarization is 1.968 cm,
yThe coupling length of polarization is 2.193 cm.Get
xThe coupling length of polarization is the length of fiber coupler, and the bandwidth that obtains coupling mechanism thus with the curve of wavelength variations as shown in Figure 8.Requiring it to insert under the prerequisite of loss less than 3.4 dB, the bandwidth range that can obtain this coupling mechanism is 295 ~ 330 μ m, and bandwidth is 35 μ m.With
xPolarization is the size of example explanation coupling mechanism output energy.Calculating absorption loss is 2.558 dB, adds insertion loss 3 dB by coupling mechanism, and the output energy is 5.558 dB, is monolateral fibre core output energy after converting and accounts for 27.81% of gross energy.
Embodiment two:
Get outer air hole 2 diameters
d 1 With inner air hole 3 diameters
d 2 Satisfy
d 1 d 2 The airport cycle is
Λ=200 μ m, the normalization diameter in outer air hole
d 1 / Λ=0.85, the normalization diameter in inner air hole
d 2 / Λ=0.45, promptly
d 1 =170 μ m,
d 2 =90 μ m.At this moment, optical fiber
xThe coupling length of polarization mode is 0.636 cm,
yPolarization mode is 0.653 cm.Because optical fiber
xWith
yThe coupling length of polarization differs very little, so get the length of optical fiber is
xThe coupling length of polarization, its bandwidth change curve as shown in Figure 9.As shown in the figure, when wavelength in the scope of 285 ~ 325 μ m, the insertion loss of coupling mechanism is all less than 3.4 dB, bandwidth is 40 μ m.With
xPolarization is that example is calculated, draw at centre wavelength 300 μ m places, monolateral output terminal output energy is 41.43% of a gross energy, and the gross energy of both sides output is 82.86% of the input gross energy, so energy has only lost approximately 17% in the transmission course, greatly reduces absorption loss.This class formation has improved the transmission performance of coupling mechanism, has improved the transfer efficiency of THz wave.
Adopt as shown in Figure 6, remove second fibre core 5, become twin-core structure but not three-core structure can obtain directional coupler equally, as get
D/ Λ=0.6,
Λ=240 μ m, the incident THz wave is 1 THz, its
xThe insertion loss of polarization with the wavelength change curve as shown in Figure 7.As can be seen from Figure 7, the energy distribution of two fibre cores is complementary state, when optical fiber insertion loss reaches 3 dB (two fibre core energy are respectively 50%), calculates
xThe coupling length of polarization is 1.764 cm.But this moment, rate of curve was bigger, and the insertion loss is very fast with wavelength change.As seen from the figure, get bandwidth requirement for inserting loss less than 3.4 dB, then its bandwidth is less than 10 μ m.And the coupler structure of this class formation is asymmetric, and two fibre core energy distribution are inhomogeneous.The THz wave equipartition of energy that will enter from the center based on the Terahertz coupling mechanism of three-core structure photonic crystal fiber is two fibre cores to the next door, and the optical fiber coupling length is shorter, energy is controlled easily, bandwidth of an optical fiber is also wide a lot of than twin-core coupling mechanism, so three core coupling mechanisms have more advantage than twin-core structure.
Claims (3)
1. Terahertz photonic crystal optical fiber coupler, comprise covering and fibre core, it is characterized in that: described fibre core is three, form by the host material that the inner air hole (3) that is positioned at the regular hexagon summit surrounds, wherein first fibre core (4) is by being positioned at the host material center, second fibre core (5) and the 3rd fibre core (6) symmetry be positioned at described first fibre core (4) both sides; Described covering is made up of outer air hole (2), inner air hole (3) and host material beyond the fibre core, and a plurality of described outer air holes (2) surround network outside described inner air hole (3), and equidistant between the adjacent described outer air hole (2); Described first fibre core (4) is an input end, and described second fibre core (5) and the 3rd fibre core (6) are output terminal; The length of fiber coupler equals the coupling length of fibre core basic mode; The hole cycle of described inner air hole (3) and outer air hole (2)
ΛIdentical, the diameter in described outer air hole (2)
d 1 Diameter with inner air hole (3)
d 2 Between relation satisfy
d 1 〉=
d 2
2. a kind of Terahertz photonic crystal optical fiber coupler according to claim 1 is characterized in that: the diameter in described outer air hole (2)
d 1 Diameter with inner air hole (3)
d 2 Satisfy
d 1 =
d 2 =
d, and satisfy
D/ Λ〉=0.5,0.5 λ≤
Λ≤ 1.2 λ, wherein λ is the wavelength of the THz wave of transmission.
3. a kind of Terahertz photonic crystal optical fiber coupler according to claim 1 is characterized in that: the diameter in described outer air hole (2)
d 1 Diameter with inner air hole (3)
d 2 Satisfy
d 1 d 2 , and satisfy
d 2 / Λ≤ 0.5,
d 1 / Λ〉=1.2-
d 2 / Λ, 0.5 λ≤
Λ≤ λ.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607609A (en) * | 2012-03-12 | 2012-07-25 | 天津理工大学 | Novel high-sensitivity photonic crystal fiber terahertz evanescent wave sensing device |
| CN102937731A (en) * | 2012-10-09 | 2013-02-20 | 中国计量学院 | Terahertz wave polarization beam splitter based on porous hollow structure |
| CN103048729A (en) * | 2012-12-31 | 2013-04-17 | 江苏大学 | Terahertz porous optical fiber |
| CN110289471A (en) * | 2019-05-31 | 2019-09-27 | 江苏大学 | A kind of terahertz waveguide |
| CN110441258A (en) * | 2019-07-12 | 2019-11-12 | 南京邮电大学 | Probe-type index sensor based on surface plasma body resonant vibration |
| CN111617683A (en) * | 2020-04-10 | 2020-09-04 | 桂林电子科技大学 | Photothermal microfluidic mixer based on porous optical fiber |
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| CN101122652A (en) * | 2007-08-08 | 2008-02-13 | 浙江大学 | Photon crystal optical fibre polarization-maintaining beam splitter |
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| KRISTIAN NIELSEN等: "Broadband terahertz fiber directional coupler", 《OPTICS LETTERS》 * |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607609A (en) * | 2012-03-12 | 2012-07-25 | 天津理工大学 | Novel high-sensitivity photonic crystal fiber terahertz evanescent wave sensing device |
| CN102607609B (en) * | 2012-03-12 | 2015-02-04 | 天津理工大学 | Novel high-sensitivity photonic crystal fiber terahertz evanescent wave sensing device |
| CN102937731A (en) * | 2012-10-09 | 2013-02-20 | 中国计量学院 | Terahertz wave polarization beam splitter based on porous hollow structure |
| CN102937731B (en) * | 2012-10-09 | 2013-10-30 | 中国计量学院 | Terahertz wave polarization beam splitter based on porous hollow structure |
| CN103048729A (en) * | 2012-12-31 | 2013-04-17 | 江苏大学 | Terahertz porous optical fiber |
| CN103048729B (en) * | 2012-12-31 | 2015-02-04 | 江苏大学 | Terahertz porous optical fiber |
| CN110289471A (en) * | 2019-05-31 | 2019-09-27 | 江苏大学 | A kind of terahertz waveguide |
| CN110289471B (en) * | 2019-05-31 | 2020-11-03 | 江苏大学 | Terahertz waveguide |
| CN110441258A (en) * | 2019-07-12 | 2019-11-12 | 南京邮电大学 | Probe-type index sensor based on surface plasma body resonant vibration |
| CN111617683A (en) * | 2020-04-10 | 2020-09-04 | 桂林电子科技大学 | Photothermal microfluidic mixer based on porous optical fiber |
| CN111617683B (en) * | 2020-04-10 | 2022-04-19 | 桂林电子科技大学 | Photothermal microfluidic mixer based on porous optical fiber |
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Application publication date: 20111221 |