CN106054424A - Terahertz liquid crystal phase shifter based on surface plasmon polaritons - Google Patents
Terahertz liquid crystal phase shifter based on surface plasmon polaritons Download PDFInfo
- Publication number
- CN106054424A CN106054424A CN201610692435.6A CN201610692435A CN106054424A CN 106054424 A CN106054424 A CN 106054424A CN 201610692435 A CN201610692435 A CN 201610692435A CN 106054424 A CN106054424 A CN 106054424A
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- China
- Prior art keywords
- liquid crystal
- phase shifter
- quartz substrate
- terahertz
- crystal phase
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1313—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells specially adapted for a particular application
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/008—Surface plasmon devices
Abstract
The invention discloses a terahertz liquid crystal phase shifter based on surface plasmon polaritons. The terahertz liquid crystal phase shifter comprises an upper quartz substrate and a lower quartz substrate which are separated from each other by a liquid crystal layer and are connected with electrodes, and a metal film is arranged at the bottom of the upper quartz substrate and is provided with a plurality of regularly-shaped slots in linear and periodic arrangement. The terahertz liquid crystal phase shifter based on the surface plasmon polaritons provides a method for achieving terahertz electromagnetic wave phase shift and has the advantages of compact structure, easiness in planar integration and capability of working in terahertz low-frequency bands.
Description
Technical field
The present invention relates to THz devices field, a kind of liquid crystal phase shifter based on surface plasma excimer.
Background technology
THz wave image objects, environmental monitoring, medical diagnosis, radio astronomy, broadband mobile communication, satellite communication and
The aspects such as military radar have great scientific value and wide application prospect, thus are paid attention to by the most widely.Make
For the basis of Terahertz application, can the regulation and control device of the THz wave particularly THz wave phase shifter becomes THz wave wide
The key of general application.
At present the phase-shifter under Terahertz frequency range is little, and these devices or volume bigger, it is difficult to and planar circuit with
And system on chip, or system composition complexity, technology difficulty is big.
Use thought and the technology of planarization, develop the terahertz wave band phase shifting device of miniaturization, planarization, it has also become
The research direction of Terahertz field study emphasis.
Summary of the invention it is an object of the invention to provide a kind of liquid crystal phase shifter based on surface plasma excimer, to solve
The problem that certainly prior art exists.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of liquid crystal phase shifter based on surface plasma excimer, it is characterised in that: include upper and lower two-layer quartz substrate, on
Being provided with metallic film in layer quartz substrate, two-layer quartz substrate is separated by liquid crystal layer, and two-layer quartz substrate is connected to electricity respectively
Pole, has multiple linearly fluting in periodic arrangement in metallic film.
Described metallic film, it is characterised in that: each fluting shape is identical, is rectangular channel, or dovetail groove, or
Other regular shapes.
According to Theory of Electromagnetic Field, there is the biography of the metallic film support surface plasma wave of the fluting of periodic arrangement
Defeated.When metallic film has the periodic structure of rectangular channel, dovetail groove or other forms, the dispersion of surface plasma wave
Characteristic is mainly determined by its structural parameters.Reasonable adjustment physical dimension, surface plasma wave can be operated in terahertz wave band.
Change the bias of quartz substrate, thus it is possible to vary the dielectric constant of liquid crystal.According to electromagnetic field principle, surface plasma
The propagation constant of ripple is directly related with the dielectric constant of medium.Therefore by regulating the bias of quartz substrate, it is possible to achieve to gold
Belong to the control of the phase shift of film surface plasma wave.
The invention provides a kind of liquid crystal phase shifter based on surface plasma excimer.Electrode is connected on respectively upper and lower two
In layer quartz substrate, by adjusting magnitude of voltage size, thus it is possible to vary the dielectric constant of liquid crystal, thus control metal film surfaces etc.
The propagation constant of ion bulk wave, it is achieved the function of phase shift.The present invention is a kind of method realizing terahertz electromagnetic wave phase shift.Have
Compact conformation, it is prone to the feature of Planar integration, terahertz wave band can be operated in.
Accompanying drawing explanation
The liquid crystal phase shifter structure schematic diagram that Fig. 1 provides for the present invention.
Fig. 2 is liquid crystal phase shifter element structure distribution map of the electric field under 500GHz frequency.
Fig. 3 is the dielectric constant of the liquid crystal dispersion map of surface plasma wave when being respectively 2.4,2.8 and 3.2.
Fig. 4 is that the dielectric constant of liquid crystal is from 2.4 phase-shift phases changing to for the 3.2 liquid crystal phase shifters with 30 cellular constructions
Change.
Detailed description of the invention
As it is shown in figure 1, a kind of liquid crystal phase shifter based on surface plasma excimer, include upper and lower two-layer quartz substrate
3, upper strata quartz substrate is provided with metallic film 1, two-layer quartz substrate is separated by liquid crystal layer 2, in upper and lower two-layer quartz substrate
It is connected to electrode respectively, metallic film 1 has multiple linearly fluting in periodic arrangement.Each fluting shape is identical, all
For rectangular channel.
Rectangular channel in periodic arrangement in metallic film, its width d is 100 μm, and thickness t is 1 μm, rectangular channel period p
Being 100 μm, groove depth h is 50 μm, and groove width w is 40 μm, and the thickness s1 of liquid crystal layer is 20.5 μm, the thickness s2 of levels quartz substrate
It is 50 μm.
Simulation software CST is utilized to build the structural model determined by above-mentioned several junction parameters, when the dielectric constant of liquid crystal is 2.4
Time, at the Frequency point of 500GHz, its surface plasma wave Electric Field Distribution is as shown in Figure 2.
When the dielectric constant of liquid crystal is respectively 2.4,2.8 and 3.2, the dispersion curve of surface plasma wave such as Fig. 3 institute
Show.As shown in Figure 3: at same frequency (500GHz) place, the plasma wave phase velocity of metal surface is with the change of liquid crystal dielectric constant
Change and change.By the dielectric constant of adjustable liquid crystal display, the phase-shift phase of surface plasma wave can be controlled.
The liquid crystal phase shifter in the case of 30 cycles, when the dielectric constant of liquid crystal changes to 3.2 from 2.4 surface etc. from
Daughter ripple phase-shift phase situation of change such as Fig. 4 at 500GHz, the phase shift of surface plasma wave is in the range of 0 degree of-360 degree
Can be adjusted by adjustable liquid crystal display dielectric constant.In like manner, the phase-shift phase at other frequency may be used without same method and carries out
Regulation, thus realize the phase shift of THz wave within the specific limits.
Claims (2)
1. a liquid crystal phase shifter based on surface plasma excimer, it is characterised in that: include upper and lower two-layer quartz substrate,
Two-layer quartz substrate is separated by liquid crystal layer, upper and lower two-layer quartz substrate is connected to electrode respectively, also sets bottom the quartz substrate of upper strata
Be equipped with metallic film, metallic film has multiple linearly in periodic arrangement regular shape fluting.
A kind of liquid crystal phase shifter based on surface plasma excimer, it is characterised in that: described
Each regular shape fluting shape is identical, for rectangular channel, dovetail groove or other regular shapes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610692435.6A CN106054424A (en) | 2016-08-19 | 2016-08-19 | Terahertz liquid crystal phase shifter based on surface plasmon polaritons |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610692435.6A CN106054424A (en) | 2016-08-19 | 2016-08-19 | Terahertz liquid crystal phase shifter based on surface plasmon polaritons |
Publications (1)
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|---|---|
| CN106054424A true CN106054424A (en) | 2016-10-26 |
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| CN201610692435.6A Pending CN106054424A (en) | 2016-08-19 | 2016-08-19 | Terahertz liquid crystal phase shifter based on surface plasmon polaritons |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108333803A (en) * | 2018-01-23 | 2018-07-27 | 中国计量大学 | A kind of adjustable Terahertz meta-material absorber |
Citations (5)
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|---|---|---|---|---|
| US20090002581A1 (en) * | 2006-08-28 | 2009-01-01 | National Chiao Tung University | Tunable terahertz wavelength selector device using magnetically controlled birefringence of liquid crystals |
| CN102866554A (en) * | 2012-10-10 | 2013-01-09 | 南京大学 | Broadband-adjustable terahertz wave plate |
| CN103592711A (en) * | 2013-11-14 | 2014-02-19 | 上海理工大学 | Periodic surface plasma grating terahertz filter |
| CN104049426A (en) * | 2014-07-11 | 2014-09-17 | 南京大学 | Bandwidth adjustable liquid crystal terahertz wave plate based on porous graphene transparent electrode |
| CN104733811A (en) * | 2015-02-26 | 2015-06-24 | 合肥工业大学 | Phase shifter based on graphene planar plasma artificial structure |
-
2016
- 2016-08-19 CN CN201610692435.6A patent/CN106054424A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090002581A1 (en) * | 2006-08-28 | 2009-01-01 | National Chiao Tung University | Tunable terahertz wavelength selector device using magnetically controlled birefringence of liquid crystals |
| CN102866554A (en) * | 2012-10-10 | 2013-01-09 | 南京大学 | Broadband-adjustable terahertz wave plate |
| CN103592711A (en) * | 2013-11-14 | 2014-02-19 | 上海理工大学 | Periodic surface plasma grating terahertz filter |
| CN104049426A (en) * | 2014-07-11 | 2014-09-17 | 南京大学 | Bandwidth adjustable liquid crystal terahertz wave plate based on porous graphene transparent electrode |
| CN104733811A (en) * | 2015-02-26 | 2015-06-24 | 合肥工业大学 | Phase shifter based on graphene planar plasma artificial structure |
Non-Patent Citations (1)
| Title |
|---|
| HSIN-YING WU 等: "Electrically Tunable Room-Temperature 2π Liquid Crystal Terahertz Phase Shifter", 《PHOTONICS TECHNOLOGY LETTERS》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108333803A (en) * | 2018-01-23 | 2018-07-27 | 中国计量大学 | A kind of adjustable Terahertz meta-material absorber |
| CN108333803B (en) * | 2018-01-23 | 2020-10-20 | 中国计量大学 | Adjustable terahertz metamaterial absorber |
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Application publication date: 20161026 |
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