CN103194788B - The preparation of Terahertz frequency range anisotropic medium crystal, sign and application method - Google Patents
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- 239000013078 crystal Substances 0.000 title claims abstract description 103
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 238000001228 spectrum Methods 0.000 claims abstract description 12
- 239000012047 saturated solution Substances 0.000 claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 7
- 238000001328 terahertz time-domain spectroscopy Methods 0.000 claims abstract description 5
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 20
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 14
- 239000000243 solution Substances 0.000 claims description 13
- 229940001516 sodium nitrate Drugs 0.000 claims description 10
- 235000010344 sodium nitrate Nutrition 0.000 claims description 10
- 239000004317 sodium nitrate Substances 0.000 claims description 10
- 239000006185 dispersion Substances 0.000 claims description 9
- JZCCFEFSEZPSOG-UHFFFAOYSA-L copper(II) sulfate pentahydrate Chemical compound O.O.O.O.O.[Cu+2].[O-]S([O-])(=O)=O JZCCFEFSEZPSOG-UHFFFAOYSA-L 0.000 claims description 8
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 6
- 239000011701 zinc Substances 0.000 claims description 6
- 229910052725 zinc Inorganic materials 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 5
- 235000003283 Pachira macrocarpa Nutrition 0.000 claims description 2
- 241001083492 Trapa Species 0.000 claims description 2
- 235000014364 Trapa natans Nutrition 0.000 claims description 2
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 2
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 2
- 235000009165 saligot Nutrition 0.000 claims description 2
- 238000004611 spectroscopical analysis Methods 0.000 claims description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims 1
- 229910000368 zinc sulfate Inorganic materials 0.000 claims 1
- 229960001763 zinc sulfate Drugs 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000012512 characterization method Methods 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 description 5
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- 238000011160 research Methods 0.000 description 3
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 235000013305 food Nutrition 0.000 description 1
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- 229910052739 hydrogen Inorganic materials 0.000 description 1
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- 238000007689 inspection Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000011896 sensitive detection Methods 0.000 description 1
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Abstract
The invention belongs to electromagnetic medium field of material technology, particularly a kind of preparation of Terahertz frequency range anisotropic medium crystal, sign and application method.The present invention prepares the aeolotropic crystal of low-symmetry with saturated solution falling temperature method, and adopts terahertz time-domain spectroscopy system and rotatable sample table to test its anisotropy dielectric response and optical parametric.The present invention utilizes tera-hertz spectra and rotatable sample table to characterize anisotropic medium, the mainly anisotropic optical properties of low assymetric crystal, and be relevant THz devices, the exploitation of inhaling ripple device, polarizer and beam splitter as Terahertz lays the foundation.Preparation and characterization method of the present invention is simple, is convenient to promote, and the crystal obtained is inhaled at THz on the novel THz devices such as ripple device, THz polarizer and THz beam splitter and had larger application prospect.<!--1-->
Description
Technical field
The invention belongs to electromagnetic medium field of material technology, particularly a kind of preparation of Terahertz frequency range anisotropic medium crystal, sign and application method.
Background technology
Terahertz emission refers to that frequency is at 0.1 ~ 10THz (1THz=10
12hz) electromagnetic radiation in scope, on electromagnetic spectrum, terahertz emission is between microwave and far infrared, roughly at far low frequency end.Before the eighties in 20th century, owing to lacking efficient THz source of radiation and sensitive Detection Techniques, the research in this field does not almost relate to, and is therefore called as " THz is blank ".Subsequently, researchist finds, utilizes the GaAs crystal of low-temperature epitaxy can realize transmitting and the detection of THz wave simultaneously, this facilitates the practical of THz technology.At present, tera-hertz spectra is used widely in fields such as food and medicine analysis, hazardous substance inspection, investigations of materials.
Wherein, the Terahertz electromagnetic response research of material is one of the study hotspot in tera-hertz spectra technology and application field.The THz dielectric response behavior of material can provide the bulk information in material structure symmetry, diaphragm, hydrogen bond etc.On the other hand, the exploitation of novel THz devices can effectively be promoted to the grasp of material THz character, effectively to regulate and control THz wave.Wherein, there is the low assymetric crystal of anisotropic dielectric response and optical property, THz device has great application prospect, as THz inhales ripple device, THz polarizer and THz beam splitter etc.Therefore, research anisotropic medium, mainly preparation method, the THz electromagnetic response of low assymetric crystal, have the double meaning exploring physical mechanism and development of new device.
Summary of the invention
Not enough for prior art, the invention provides a kind of preparation of Terahertz frequency range anisotropic medium crystal, sign and application method.
A preparation method for Terahertz frequency range anisotropic medium crystal, its concrete scheme is as follows:
The saturated solution of preparation target Terahertz frequency range anisotropic medium crystal, its temperature is higher than room temperature 20 DEG C ~ 40 DEG C, hang seed crystal in the solution and place it in crystal growing furnace, then room temperature is down to, rate of temperature fall is 0.5 DEG C/h ~ 2 DEG C/h, target Terahertz frequency range anisotropic medium crystal can be obtained;
Described crystal has three tiltedly, monocline, water chestnut side, six sides or orthorhombic crystal structure;
The size of described crystal is not less than 5mm × 5mm × 1mm.
Described crystal is Salzburg vitriol crystal, SODIUMNITRATE crystal, Zinc vitriol crystal or bitter salt crystal.
A characterizing method for Terahertz frequency range anisotropic medium crystal, its concrete scheme is as follows:
X-ray single crystal orientation instrument carries out orientation to Terahertz frequency range anisotropic medium crystal, then cuts in the desired direction and polished finish; Crystal prototype after polishing is fixed to and can planar rotates at any angle on specimen holder, transmission-type terahertz time-domain spectroscopy is tested its time-domain spectroscopy, obtains frequency domain spectra by Fast Fourier Transform (FFT) (FFT); Crystal dielectric parameter in particular directions (comprising real part and imaginary part) and optical constant (specific refractory power, optical extinction coefficient) is solved by the amplitude components of frequency domain spectra and phase information; After being turned an angle by sample, again test Time Domain Spectrum, do Fast Fourier Transform (FFT) process, solve electromagnetic parameter; Obtain dielectric parameter and the optical constant of any direction in crystallographic plane thus.
An application method for Terahertz frequency range anisotropic medium crystal, described crystal is for the preparation of THz devices.
Described THz devices is that Terahertz inhales ripple device, terahertz polarization device or Terahertz beam splitter.
Beneficial effect of the present invention is:
Preparation and characterization method of the present invention is simple, is convenient to promote, and the crystal obtained is inhaled at THz on the novel THz devices such as ripple device, THz polarizer and THz beam splitter and had larger application prospect.
Embodiment
The invention provides a kind of preparation of Terahertz frequency range anisotropic medium crystal, sign and application method, below in conjunction with embodiment, the present invention will be further described.
Embodiment 1
Salzburg vitriol crystal belongs to triclinic(crystalline)system, and symmetry is very low, only has an inversion center of symmetry, therefore has anisotropic terahertz optics character.In addition, in Salzburg vitriol crystal, there is some low-frequency vibration moulds and part rotation mould, will produce resonant dispersion and absorption, and dispersion and absorption all exist anisotropy to THz radiation, it is inhaled on ripple device and THz polarizer at THz application prospect.Preparation and the optical constant testing method of its crystal are as follows: preparation temperature is the copper sulfate saturated solution 50g ~ 100g of 50 DEG C ~ 60 DEG C, after hanging seed crystal in the solution, solution is placed in crystal growing furnace, 25 DEG C are down to the speed of 1 DEG C/h, obtain target crystal, its size can reach 15mm × 10mm × about 8mm.Through X-ray diffraction qualification, the crystal face of the surface correspondence that area is larger is generally (110) face, along the direction sliced crystal being parallel to this crystal face and polish, polishing, obtain size at the crystal prototype of 10mm × 8mm × 1.5mm.Be fixed to by sample on rotatable specimen holder, test terahertz time-domain spectroscopy, carries out fourier transformation, obtains frequency domain spectra, and then solves dielectric parameter and optical constant.Result shows: in (110) crystal face, crystal presents anisotropic feature at the dielectric response of all directions, and near 0.95THz, real part of permittivity exists a stronger resonant dispersion, and its imaginary part, close to 0.9, absorbs obviously; Rotated by sample after 90 °, resonance disappears, and dielectric imaginary part is 0.25.Therefore, Salzburg vitriol crystal is inhaled on ripple device and polarizer can obtain utilization at THz.
Embodiment 2
SODIUMNITRATE crystal belongs to rhombohedral system, and symmetry is also lower, and optical property also has anisotropy, is exactly a kind of birefringent crystal material at visible light frequency band.In Terahertz frequency range, there are some low-frequency vibration moulds in SODIUMNITRATE, mainly lattice vibration and part translation, swing mould, resonant dispersion and absorption will be produced to THz radiation, simultaneously as a kind of anisotropic medium, this makes that its suction ripple device at THz, THz polarizer and THz beam splitter have application prospect.Preparation and the optical constant testing method of its crystal are as follows: preparation temperature is the SODIUMNITRATE saturated solution 50g ~ 100g of 60 DEG C ~ 70 DEG C, after hanging seed crystal in the solution, solution is placed in crystal growing furnace, 20 DEG C are down to the speed of 0.5 DEG C/h, obtain target crystal, its size can reach 10mm × 10mm × about 2.5mm.Through X-ray diffraction qualification, the crystal face of the surface correspondence that area is larger is generally (104) face, along the direction polishing, the polishing crystal that are parallel to this crystal face, obtains the crystal prototype of size at 8mm × 8mm × 1.5mm.Be fixed to by sample on rotatable specimen holder, test terahertz time-domain spectroscopy, carries out fourier transformation, obtains frequency domain spectra, and then solves dielectric parameter and optical constant.Result shows: in (104) crystal face, crystal presents anisotropic feature at the dielectric response of all directions, and near 0.50THz, real part of permittivity exists a stronger resonant dispersion, and its imaginary part, close to 1.0, absorbs obviously; Rotated by sample after 60 °, resonance disappears, and dielectric imaginary part is 0.20.Therefore, SODIUMNITRATE crystal is inhaled on ripple device, THz polarizer and THz beam splitter can obtain utilization at THz.
Embodiment 3
Zinc vitriol crystal belongs to rhombic system, and symmetry is lower, therefore also has anisotropic terahertz optics character.In this crystal, be in low frequency lattice vibrational modes in Terahertz range of frequency and part and rotate mould and will produce anisotropic resonant dispersion and absorption to THz radiation, therefore, this crystal can be inhaled on ripple device and THz polarizer at THz and use.Zinc vitriol crystal can be prepared by saturated solution falling temperature method, and suitable initial temperature is higher than room temperature 30 DEG C ~ 40 DEG C, and rate of temperature fall is 0.5 DEG C/h ~ 1 DEG C/h.
Embodiment 4
Bitter salt crystal belongs to rhombic system, and symmetry is also lower, and therefore the dielectric response of its Terahertz and optical property also present anisotropy feature.And low frequency lattice vibrational modes in crystal and part rotate mould and be in THz range of frequency, will produce anisotropic resonant dispersion and absorption to THz radiation, therefore, this crystal is inhaled in ripple device and THz polarizer at THz and is had application prospect.Bitter salt crystal adopts the preparation of traditional saturated solution falling temperature method, and initial soln temperature is generally 50 DEG C ~ 40 DEG C, and rate of temperature fall is 0.5 DEG C/h ~ 1 DEG C/h.
Claims (2)
1. a preparation method for Terahertz frequency range anisotropic medium crystal, it is characterized in that, concrete scheme is as follows:
Described crystal has three tiltedly, water chestnut side or orthorhombic crystal structure; Particularly, described crystal is Salzburg vitriol crystal, SODIUMNITRATE crystal, Zinc vitriol crystal or bitter salt crystal;
The size of described crystal is not less than 5mm × 5mm × 1mm;
Wherein, the method preparing Salzburg vitriol crystal is: preparation temperature is the copper sulfate saturated solution of 50 DEG C ~ 60 DEG C, after hanging seed crystal in the solution, is placed on by solution in crystal growing furnace, be down to 25 DEG C with the speed of 1 DEG C/h, obtain the anisotropic Salzburg vitriol crystal of Terahertz frequency range;
The method preparing SODIUMNITRATE crystal is: preparation temperature is the SODIUMNITRATE saturated solution of 60 DEG C ~ 70 DEG C, after hanging seed crystal in the solution, solution is placed in crystal growing furnace, is down to 20 DEG C with the speed of 0.5 DEG C/h, obtain the anisotropic SODIUMNITRATE crystal of Terahertz frequency range;
The method preparing Zinc vitriol crystal is: preparation temperature is higher than the zinc sulfate saturated solution of room temperature 30 DEG C ~ 40 DEG C, after hanging seed crystal in the solution, solution is placed in crystal growing furnace, be down to room temperature with the speed of 0.5 DEG C/h ~ 1 DEG C/h, obtain the anisotropic Zinc vitriol crystal of Terahertz frequency range;
The method preparing bitter salt crystal is: preparation temperature is the saturated solution of magnesium sulfate of 50 DEG C ~ 40 DEG C, after hanging seed crystal in the solution, solution is placed in crystal growing furnace, be down to room temperature with the speed of 0.5 DEG C/h ~ 1 DEG C/h, obtain the anisotropic bitter salt crystal of Terahertz frequency range.
2. the preparation method of a kind of Terahertz frequency range anisotropic medium crystal according to claim 1, it is characterized in that, X-ray single crystal orientation instrument carries out orientation to Terahertz frequency range anisotropic medium crystal, then cuts in the desired direction and polished finish; Crystal prototype after polishing is fixed to and can planar rotates at any angle on specimen holder, transmission-type terahertz time-domain spectroscopy is tested its time-domain spectroscopy, obtains frequency domain spectra by Fast Fourier Transform (FFT); Crystal dielectric parameter in particular directions and optical constant is solved by the amplitude components of frequency domain spectra and phase information; After being turned an angle by sample, again test Time Domain Spectrum, do Fast Fourier Transform (FFT) process, solve electromagnetic parameter; Obtain dielectric parameter and the optical constant of any direction in crystallographic plane thus; The crystal face of the surface correspondence that Salzburg vitriol crystalline areas is larger is 110, in 110 crystal faces, crystal presents anisotropic feature at the dielectric response of all directions, near 0.95THz, there is a stronger resonant dispersion in real part of permittivity, sample, close to 0.9, rotates after 90 ° by its imaginary part, resonance disappears, and dielectric imaginary part is 0.25; The crystal face of the surface correspondence that SODIUMNITRATE crystalline areas is larger is 104, in 104 crystal faces, crystal presents anisotropic feature at the dielectric response of all directions, near 0.50THz, there is a stronger resonant dispersion in real part of permittivity, sample, close to 1.0, rotates after 60 ° by its imaginary part, resonance disappears, and dielectric imaginary part is 0.20.
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| CN110297337B (en) * | 2019-06-26 | 2021-04-06 | 天津大学 | Voltage-controlled terahertz polarization modulation device with rhenium diselenide nanosheets |
| CN111708114A (en) * | 2020-07-22 | 2020-09-25 | 福州大学 | Terahertz polaroid preparation method based on magnetic liquid |
| CN113571919B (en) * | 2021-07-07 | 2023-06-16 | 佛山(华南)新材料研究院 | Wave absorbing device and preparation method thereof |
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