CN104865695B - THz wave communication frequency switching device and switching method based on prism structure - Google Patents
THz wave communication frequency switching device and switching method based on prism structure Download PDFInfo
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- CN104865695B CN104865695B CN201510292696.4A CN201510292696A CN104865695B CN 104865695 B CN104865695 B CN 104865695B CN 201510292696 A CN201510292696 A CN 201510292696A CN 104865695 B CN104865695 B CN 104865695B
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Abstract
The invention provides a kind of THz wave communication frequency switching device based on prism structure and switching method, including THz wave emission part, prism portion, grating portion and displacement platform portion, the plane of incidence in terahertz sources portion and prism portion is relative, the parallel plane of incidence for being incident in prism portion of the THz wave of transmitting, THz wave is with bottom reflection of the TM mode through prism portion, to be coupled into the form of evanescent waves in the grating portion below prism portion reflecting surface, in grating surface formation surface plasma wave.By detecting the reflected light of prism exit facet, it can be found that the reflectivity at a certain frequency drastically declines, absworption peak is formed.Gap between grating portion and prism portion constitutes the transmission channel of surface plasma wave, and the purpose that control communication frequency switches is reached by artificially changing gap thickness.
Description
Technical field
The invention belongs to the THz wave communications field, and in particular to a kind of THz wave communication frequency based on prism structure
Switching device and switching method.
Background technology
Terahertz (THz) ripple is the electromagnetic wave being located between microwave and far infrared.In recent years, with ultrafast laser technique
Development so that having for terahertz pulse is stable, reliable excitation source, allows one to study terahertz from this
Hereby.Terahertz is led in biomedicine, safety monitoring, nondestructive detecting, astronomy, spectrum and imaging technique and information science etc.
Domain has a wide range of applications.And the development and utilization of terahertz wave band be unable to do without Terahertz function element, Terahertz band wave arrestment is led
It is a kind of basic function element of Terahertz application, is also one of important devices of Terahertz detection field.Good filtering
Effect represents high s/n ratio and high sensitivity.
Surface plasma is provided in the widely studied application for high-performance terahertz filter part of terahertz wave band
Great possibility (J.Appl.Phys.107 (11), 111101,2010).But, the surface plasma excited in metal surface
Body excimer is very faint, it is impossible to meet demand (Progress in quantum electronics, 32 (1), 1-41,2008).
2014, Chen Lin et al. (Opt.Lett.39 (15), 4541-4544,2014) proposed the Terahertz of single groove parallel plate structure
Bandreject filtering device, high-performance Terahertz multichannel bandreject filtering device is realized using the high-order chamber mould of single groove.But it is not
Foot is that it can not realize the switching of frequency filtering.
The content of the invention
The present invention is carried out to solve the above problems, and is communicated by providing a kind of THz wave based on prism structure
Frequency switching mechanism, realizes the saltus step of frequency filtering.
Present invention employs following technical scheme：
The THz wave communication frequency switching device based on prism structure that the present invention is provided, it is special with such technology
Levy, including：THz wave emission part, for launching THz wave；Prism portion, is arranged in the light path of THz wave, the plane of incidence
It is relative with THz wave emission part, for receiving THz wave, and conduct THz wave；Grating portion, is arranged at the reflection of prism portion
The lower section in face, and prism portion are spaced in intervals, for couple THz wave, including a plurality of the first spaced grooves with
And second groove；Displacement platform portion, is connected with prism portion and grating portion, between adjusting between prism portion and grating portion respectively
Away from；And the exit facet in THz wave acceptance division, and prism portion is relative, for receiving the THz wave through the inclined-plane.Its
In, the groove depth of the first groove and the second groove is different；THz wave in the form of evanescent waves to be coupled into grating portion；Displacement platform
Portion adjusts the spacing between prism portion and grating portion, and the evanescent waves for different frequency are coupled into grating portion, realize terahertz
The hereby switching of wave communication frequency.
The THz wave communication frequency switching device based on prism structure that the present invention is provided, can also have such skill
Art feature：Prism portion is Dove prism.
The THz wave communication frequency switching device based on prism structure that the present invention is provided, can also have such skill
Art feature：The depth ratio of first groove and the second groove is 1.5:1~5:1.
The THz wave communication frequency switching device based on prism structure that the present invention is provided, can also have such skill
Art feature：70 μm~700 μm of spacing between prism portion and grating portion.
The THz wave communication frequency switching device based on prism structure that the present invention is provided, can also have such skill
Art feature：The surface of first groove and the second groove is metal film, and metal film is aluminium, copper, silver, iron, nickel, titanium, gold, zinc and its conjunction
Any one in gold, the thickness of metal film is more than 400nm.
The THz wave communication frequency switching device based on prism structure that the present invention is provided, can also have such skill
Art feature：Filled in first groove and the second groove：Any one in non-conductive gas, liquid, colloid and powder.
The THz wave communication frequency switching device based on prism structure that the present invention is provided, can also have such skill
Art feature：Displacement platform portion includes the first displacement platform portion and second moving stage portion, the first displacement platform portion and the connection of prism portion, is used for
The position in prism portion, second moving stage portion and the connection of grating portion are adjusted, for adjusting the spacing between grating portion and prism portion.The
One displacement platform portion is identical with the structure in second moving stage portion, including horizontal position moving stage and vertical displacement platform.
Further, present invention also offers a kind of THz wave communication frequency switching device progress based on prism structure
The method of communication frequency switching, it is characterised in that comprise the following steps：
Step one, using THz wave emission part to the transmitting surface launching THz wave in prism portion, the surface of emission is by Terahertz
Setback are injected inside prism portion；Step 2, is reflected THz wave using the reflecting surface in prism portion, and THz wave is to disappear
The form of ripple is coupled into grating portion, and surface plasma wave is formed on grating portion surface, and is transmitted in groove array,
The THz wave not being coupled into grating portion is received using THz wave acceptance division；Step 3, is adjusted using displacement platform portion
Spacing between lens section and grating portion, realizes the switching of THz wave communication frequency.
Invention effect and effect
The THz wave communication frequency switching device based on prism structure provided according to the present invention, due to grating portion and rib
Difference can be achieved by the size for adjusting spacing as the transmission channel of evanescent waves in the certain spacing in mirror portion interval, the spacing
The THz wave of frequency is coupled to the surface in grating portion in the form of evanescent waves, and forms surface plasma on the surface
Ripple so that the THz wave communication frequency switching device that the present invention is provided can realize the saltus step of frequency filtering.Simultaneously as light
Grid portion is provided with the first groove and the second groove of different groove depths, and surface plasma wave passes through when groove array is transmitted
The coupling of two kinds of grooves, can form the surface plasma wave of two kinds of different frequency ranges, can be selected according to practical situations
The surface plasma wave of corresponding frequencies.
Brief description of the drawings
Fig. 1 is the structural representation of the THz wave communication frequency switching device based on prism structure of the present invention；
Fig. 2 is the schematic diagram of the THz wave communication frequency switching device based on prism structure of the present invention；
Fig. 3 is the structural representation in the grating portion of the present invention；
The THz wave communication frequency switching device based on prism structure that Fig. 4 is the present invention carries out THz wave communication frequency
The flow chart of rate switching；
Fig. 5 is the transmission characteristic effect of the THz wave communication frequency switching device based on prism structure of the present invention
Figure.
Embodiment
Illustrate the embodiment of the present invention below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of the THz wave communication frequency switching device based on prism structure of the present embodiment.
Fig. 2 is the schematic diagram of the THz wave communication frequency switching device based on prism structure of the present embodiment.
As depicted in figs. 1 and 2, the THz wave communication frequency switching device 100 based on prism structure include prism portion 1,
Grating portion 2, THz wave emission part 3, THz wave acceptance division 4 and displacement platform portion 5.Grating portion 2 is located under prism portion 1
Side, terahertz sources portion 3 and Terahertz acceptance division 4 are located at the left and right sides in prism portion 1 respectively；Displacement platform portion 5 is respectively and rib
Mirror portion 1 and grating portion 2 are connected, for adjusting spacing therebetween.
Prism portion 1 is Dove prism, including the plane of incidence, exit facet and reflecting surface, the reflection in grating portion 2 and prism portion 1
Face is spaced in intervals, the plane of incidence and exit facet of terahertz sources portion 3 and Terahertz acceptance division 4 respectively with prism portion 1
Relatively, for launching terahertz wave signal to prism portion 1 and receiving the THz wave passed through from prism portion.In the present embodiment,
The size of spacing between prism portion 1 and grating portion 2 is 70~700 μm.
Fig. 3 is the structural representation in the present embodiment grating portion.
As shown in Figures 2 and 3, grating portion 2 is the photoresistance plate with groove structure, be provided with photoresistance plate it is spaced and
Depth different the first groove 21 and the second groove 22, the surface of two grooves are coated with the gold that a layer thickness is more than 400nm
Belong to film, for realizing transmission of the THz wave in groove array.In the present embodiment, metal film be by aluminium, copper, silver, iron, nickel,
Any one film being made in titanium, gold, zinc and its alloy.
One the first groove 21 and the second groove 22 adjacent thereto have collectively constituted a conduction unit in grating portion.Pass
The spacing led between the width of unit, groove width, groove depth and two grooves of two grooves is in micron order.In the present embodiment, pass
The width P for leading unit is 50 μm~300 μm, and the groove width of two grooves is 20~280 μm, the groove depth of the first groove and the second groove
Ratio is 1.5:1~5:1, the scope of groove depth size is 20~280 μm.
Meanwhile, it can be filled with the first groove and the second groove any in non-conductive gas, liquid, colloid and powder
It is a kind of.
The THz wave communication frequency switching device based on prism structure in the present embodiment carries out THz wave communication frequency
Rate switching principle be：THz wave is coupled into the form of evanescent waves and is located at reflective surface of the TM mode through prism portion 1
In grating portion 2 below prism portion, in grating surface formation surface plasma wave.By the reflection for detecting prismatic reflection face
Light, it can be found that the reflectivity at a certain frequency drastically declines, forms absworption peak.Gap structure between grating portion and prism portion
Into the transmission channel of surface plasma wave, the purpose that control communication frequency switches is reached by artificially changing gap thickness.
The preparation method in prism portion and grating portion in the present embodiment is：A trapezoidal rib is made of polytetrafluoroethylene (PTFE)
Mirror.A series of grooves are made with the photoresist of traditional ultra-violet lithography on a glass substrate, then plate on groove one
Layer 600nm gold, so that pseudo- surface plasma body grating is made.
Fig. 4 is that the progress THz wave of the THz wave communication frequency switching device based on prism structure in the present embodiment leads to
Believe the flow chart of frequency error factor.
As shown in figure 4, the THz wave communication frequency switching device based on prism structure carries out THz wave communication frequency
The method of switching comprises the following steps：
Step one, prism portion and grating portion are placed in time-domain spectroscopy system, and are respectively arranged in displacement platform portion；
Horizontal position moving stage and vertical displacement platform that step 2, regulation and prism portion are connected so that THz wave can be from
Most of THz wave injected is refracted into prism by the parallel plane of incidence for being injected into prism portion of THz wave emission part, the plane of incidence
It is internal；
Step 3, THz wave prism portion reflective surface, to be coupled into the form of evanescent waves in grating portion,
Grating portion surface forms surface plasma wave, the THz wave in grating portion is not coupled into, by the exit facet of prism, by too
Hertz wave acceptance division is received, and realizes filtering；
Step 4, surface plasma wave is transmitted in the groove array in grating portion, in the first groove and the second groove
Coupling under formed two unifrequent THz waves；
Horizontal position moving stage and vertical displacement platform that step 5, regulation and grating are connected, change prism portion and grating portion it
Between spacing, with the change of spacing, the THz wave of different frequency is filtered in prism portion, realize THz wave communication frequency
The switching of rate.
Fig. 5 is the transmission characteristic design sketch of a THz wave communication frequency switching device based on prism structure.
The size of switching device used is in Fig. 5：The conduction unit width P of groove is 60 μm, and the width of groove is
20 μm, the groove depth h of the first groove1For 100 μm, the groove depth h of the second groove2For 80 μm.Between regulation between prism portion and concave part
Away from respectively 100 μm and 400 μm.
As shown in figure 5, when the spacing g between prism and grating is 400um, in about 0.49THz place, the device
It is very small in specific frequency reflectivity, shield the signal of 0.49THz frequencies.And when g is 100um, about 1.91THz's
Place, the device is very small in specific frequency reflectivity, shields the signal of 1.91THz frequencies.Hereby it is achieved that frequency filtering
Switching.
Embodiment is acted on and effect
The THz wave communication frequency switching device based on prism structure provided according to the present embodiment, due to grating portion and
The certain spacing in prism portion interval, the spacing can be achieved not as the transmission channel of evanescent waves by the size for adjusting spacing
The THz wave of same frequency is coupled to the surface in grating portion in the form of evanescent waves, and forms surface plasma on the surface
Ripple so that the THz wave communication frequency switching device that the present invention is provided can realize the saltus step of frequency filtering.Simultaneously as light
Grid portion is provided with the first groove and the second groove of different groove depths, and surface plasma wave passes through when groove array is transmitted
The coupling of two kinds of grooves, can form the surface plasma wave of two kinds of different frequency ranges, can be selected according to practical situations
The surface plasma wave of corresponding frequencies.
The invention is not restricted to the scope of embodiment, for those skilled in the art, as long as respectively
Kind of change in the spirit and scope of the present invention that described claim is limited and is determined, these changes be it will be apparent that
All are using the innovation and creation of present inventive concept in the row of protection.
Claims (8)
1. a kind of THz wave communication frequency switching device based on prism structure, it is characterised in that have：
THz wave emission part, for launching THz wave；
In prism portion, the light path for being arranged at the THz wave, the plane of incidence and the THz wave emission part are relative, for receiving
The THz wave, and conduct the THz wave；
Grating portion, is arranged at the lower section of prism portion reflecting surface, and the prism portion is spaced in intervals, described for coupling
THz wave, including a plurality of spaced the first grooves and the second groove；
Displacement platform portion, is connected with the prism portion and grating portion respectively, for adjust the prism portion and the grating portion it
Between spacing；And
Exit facet in THz wave acceptance division, and the prism portion is relative, for receiving the terahertz through the exit facet
Hereby ripple,
Wherein, first groove is different with the groove depth of second groove,
The THz wave to be coupled into the form of evanescent waves in the grating portion,
The displacement platform portion adjusts the spacing between the prism portion and the grating portion, the evanescent waves for different frequency
It is coupled into the grating portion, realizes the switching of the THz wave communication frequency.
2. the THz wave communication frequency switching device according to claim 1 based on prism structure, it is characterised in that：
Wherein, the prism portion is Dove prism.
3. the THz wave communication frequency switching device according to claim 1 based on prism structure, it is characterised in that：
Wherein, the depth ratio of first groove and second groove is 1.5:1~5:1.
4. the THz wave communication frequency switching device according to claim 1 based on prism structure, it is characterised in that：
Wherein, the spacing between the prism portion and the grating portion is 70 μm~700 μm.
5. the THz wave communication frequency switching device according to claim 1 based on prism structure, it is characterised in that：
Wherein, the surface of first groove and second groove be metal film, the metal film be aluminium, copper, silver, iron, nickel,
Any one in titanium, gold, zinc and its alloy,
The thickness of the metal film is more than 400nm.
6. the THz wave communication frequency switching device according to claim 1 based on prism structure, it is characterised in that：
Wherein, filled in first groove and second groove：Appointing in non-conductive gas, liquid, colloid and powder
Meaning is a kind of.
7. the THz wave communication frequency switching device according to claim 1 based on prism structure, it is characterised in that：
Wherein, the displacement platform portion includes the first displacement platform portion and second moving stage portion, the first displacement platform portion and described
Prism portion is connected, the position for adjusting the prism portion, the second moving stage portion and grating portion connection, for adjusting
Spacing between the grating portion and the prism portion,
The first displacement platform portion is identical with the structure in the second moving stage portion, including horizontal position moving stage and vertical displacement
Platform.
Cut 8. the THz wave communication frequency switching device based on prism structure described in usage right requirement 1 carries out communication frequency
The method changed, it is characterised in that comprise the following steps：
Step one, using THz wave, the hair described in the THz wave emission part to the transmitting surface launching in the prism portion
Penetrate face the THz wave is refracted into inside the prism portion；
Step 2, is reflected the THz wave, the THz wave is with evanescent waves using the bottom surface in the prism portion
Form is coupled into the grating portion, surface plasma wave is formed on grating portion surface, and carried out in groove array
Transmission, is received the THz wave not being coupled into the grating portion using the THz wave acceptance division；
Step 3, adjusts the spacing between the prism portion and the grating portion using the displacement platform portion, realizes THz wave
The switching of communication frequency.
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| CN106066303B (en) * | 2016-05-24 | 2019-04-19 | 中国科学院重庆绿色智能技术研究院 | Biomolecule Terahertz characteristic signal receives runner prisms waveguide and preparation method thereof in a kind of enhancing solution |
| CN108088810B (en) * | 2017-12-11 | 2020-12-01 | 上海理工大学 | Humidity sensor based on terahertz plasma enhancement effect and system thereof |
| CN111141686B (en) * | 2020-01-02 | 2023-04-21 | 上海理工大学 | Substance fingerprint spectrum sensing device and measuring method |
| WO2021134750A1 (en) * | 2020-01-02 | 2021-07-08 | 上海理工大学 | Substance fingerprint spectrum sensing device and measuring method |
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