CN103194788A - Preparation, characterization and application methods of anisotropic medium crystal in THz (Terahertz) frequency band - Google Patents
Preparation, characterization and application methods of anisotropic medium crystal in THz (Terahertz) frequency band Download PDFInfo
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- CN103194788A CN103194788A CN2013101342317A CN201310134231A CN103194788A CN 103194788 A CN103194788 A CN 103194788A CN 2013101342317 A CN2013101342317 A CN 2013101342317A CN 201310134231 A CN201310134231 A CN 201310134231A CN 103194788 A CN103194788 A CN 103194788A
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Abstract
The invention belongs to the technical field of electromagnetic dielectric materials and in particular relates to preparation, characterization and application methods of an anisotropic medium crystal in a THz (Terahertz) frequency band. According to the preparation method, the low-symmetry anisotropic crystal is prepared by adopting a saturated solution cooling method, and the anisotropic dielectric response and optical parameters of the anisotropic crystal are tested by adopting a THz time-domain spectroscopy system and a rotatable sample stage. An anisotropic medium, mainly the anisotropic optical property of the low-symmetry crystal is characterized by using a THz spectroscopy and the rotatable sample stage, and the foundation is laid for development of related THz devices, such as a THz wave absorber, a THz polarizer and a THz beam splitter. The preparation and characterization methods disclosed by the invention are simple and convenient to popularize; and the obtained anisotropic medium crystal has a wider application prospect in terms of novel THz devices, such as the THz wave absorber, the THz polarizer and the THz beam splitter.
Description
Technical field
The invention belongs to electromagnetic medium material technology field, particularly a kind of preparation, sign and application method of Terahertz frequency range anisotropic medium crystal.
Background technology
Terahertz emission refers to that frequency is at 0.1～10 THz(1THz=10
12Hz) electromagnetic radiation in the scope, on electromagnetic spectrum, terahertz emission is between microwave and the far infrared, roughly at far low frequency end.Before the eighties in 20th century, owing to lack THz source of radiation and sensitive Detection Techniques efficiently, the research in this field does not almost relate to, and therefore is called as " THz blank ".Subsequently, the researchist finds, utilizes the GaAs crystal of low-temperature epitaxy can realize emission and the detection of THz wave simultaneously, and this has promoted the practicability of THz technology.At present, tera-hertz spectra is used widely in fields such as food and medicine detection, hazardous substance inspection, investigations of materials.
Wherein, the research of the Terahertz electromagnetic response of material is one of research focus of terahertz light spectral technology and Application Areas.The THz dielectric response behavior of material can provide the bulk information about aspects such as material structure symmetry, diaphragm, hydrogen bonds.On the other hand, can effectively promote the exploitation of novel Terahertz device to the grasp of material THz character, in order to regulate and control THz wave effectively.Wherein, have the low assymetric crystal of anisotropic dielectric response and optical property, have great application prospect at the THz device, inhale ripple device, THz polarizer and THz beam splitter etc. as THz.Therefore, the research anisotropic medium mainly is preparation method, the THz electromagnetic response of low assymetric crystal, has the double meaning of exploring physical mechanism and development of new device.
Summary of the invention
At the prior art deficiency, the invention provides a kind of preparation, sign and application method of Terahertz frequency range anisotropic medium crystal.
A kind of preparation method of 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
oC～40
oC hangs seed crystal and places it in the crystal growing furnace in solution, be down to room temperature then, and rate of temperature fall is 0.5
oC/h～2
oC/h can obtain target Terahertz frequency range anisotropic medium crystal;
Described crystal has three tiltedly, monocline, water chestnut side, six sides or orthorhombic body structure;
The size of described crystal is not less than 5 mm * 5 mm * 1 mm.
Described crystal is Salzburg vitriol crystal, SODIUMNITRATE crystal, Zinc vitriol crystal or bitter salt crystal.
A kind of characterizing method of Terahertz frequency range anisotropic medium crystal, its concrete scheme is as follows:
On X ray monocrystalline direction finder, Terahertz frequency range anisotropic medium crystal is carried out orientation, do cutting and polished finish then in the desired direction; Crystal prototype after the polishing is fixed to can planar rotates at any angle on the specimen holder, at its time-domain spectroscopy of transmission-type terahertz time-domain spectroscopy test, (FFT) obtains frequency domain spectrum by Fast Fourier Transform (FFT); Amplitude part and phase information by frequency domain spectrum solve dielectric parameter (comprise real part and imaginary part) and the optical constant (specific refractory power, optical extinction coefficient) of crystal on specific direction; After sample turned an angle, test the time domain spectrum again, do Fast Fourier Transform (FFT) and handle, find the solution electromagnetic parameter; Obtain dielectric parameter and the optical constant of any direction in the crystallographic plane thus.
A kind of application method of Terahertz frequency range anisotropic medium crystal, described crystal is for the preparation of the Terahertz device.
Described Terahertz device is that Terahertz is inhaled ripple device, terahertz polarization device or Terahertz beam splitter.
Beneficial effect of the present invention is:
Preparation of the present invention and characterizing method are simple, are convenient to promote, and resulting crystal is inhaled novel THz devices such as ripple device, THz polarizer and THz beam splitter and had bigger application prospect at THz.
Embodiment
The invention provides a kind of preparation, sign and application method of Terahertz frequency range anisotropic medium crystal, the present invention will be further described below in conjunction with embodiment.
Embodiment 1
The Salzburg vitriol crystal belongs to triclinic(crystalline)system, and symmetry is very low, has only an inversion center of symmetry, therefore has anisotropic terahertz optics character.In addition, in the Salzburg vitriol crystal, exist some low-frequency vibration moulds and part to rotate mould, will produce resonant dispersion and absorption to the THz radiation, and chromatic dispersion and absorb and all have anisotropy, it is inhaled on ripple device and the THz polarizer at THz application prospect.The preparation of its crystal and optical constant testing method are as follows: the preparation temperature is 50
oC～60
oCopper sulfate saturated solution 50 g～100 g of C behind the suspension seed crystal, are placed on solution in the crystal growing furnace, with 1 in solution
oThe speed of C/h is down to 25
oC obtains the target crystal, and its size can reach about 15 mm * 10 mm * 8 mm.Identify that through X-ray diffraction the corresponding crystal face in surface that area is bigger is generally (110) face, along also polishing of the direction sliced crystal that is parallel to this crystal face, polishing, obtain size at the crystal prototype of 10 mm * 8 mm * 1.5 mm.Sample is fixed on the rotatable specimen holder, and the test terahertz time-domain spectroscopy carries out fourier transformation, obtains frequency domain spectra, and then solves dielectric parameter and optical constant.The result shows: in (110) crystal face, crystal presents anisotropic characteristics at the dielectric response of all directions, and near 0.95 THz, there is a stronger resonant dispersion in real part of permittivity, and its imaginary part absorbs obviously near 0.9; Sample is rotated 90
oAfter the C, resonance disappears, and the dielectric imaginary part is 0.25.Therefore, the Salzburg vitriol crystal is inhaled at THz and can be obtained on ripple device and the polarizer to use.
Embodiment 2
The SODIUMNITRATE crystal belongs to rhombohedral system, and symmetry is also lower, and optical property also has anisotropy, is exactly a kind of birefringece crystal material at visible light frequency band.In the Terahertz frequency range, there are some low-frequency vibration moulds in the SODIUMNITRATE, mainly be lattice vibration and part translation, swing mould, to produce resonant dispersion and absorption to the THz radiation, as a kind of anisotropic medium, this makes it on suction ripple device, THz polarizer and the THz beam splitter of THz application prospect be arranged simultaneously.The preparation of its crystal and optical constant testing method are as follows: the preparation temperature is 60
oC～70
oSODIUMNITRATE saturated solution 50 g～100 g of C behind the suspension seed crystal, are placed on solution in the crystal growing furnace, with 0.5 in solution
oThe speed of C/h is down to 20
oC obtains the target crystal, and its size can reach about 10 mm * 10 mm * 2.5 mm.Identify that through X-ray diffraction the corresponding crystal face in surface that area is bigger is generally (104) face, along the direction polishing that is parallel to this crystal face, polishing crystal, obtain size at the crystal prototype of 8 mm * 8 mm * 1.5 mm.Sample is fixed on the rotatable specimen holder, and the test terahertz time-domain spectroscopy carries out fourier transformation, obtains frequency domain spectra, and then solves dielectric parameter and optical constant.The result shows: in (104) crystal face, crystal presents anisotropic characteristics at the dielectric response of all directions, and near 0.50 THz, there is a stronger resonant dispersion in real part of permittivity, and its imaginary part absorbs obviously near 1.0; Sample is rotated 60
oAfter the C, resonance disappears, and the dielectric imaginary part is 0.20.Therefore, the SODIUMNITRATE crystal is inhaled at THz and can be obtained on ripple device, THz polarizer and the THz beam splitter to use.
Embodiment 3
The 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 vibration mould in the Terahertz range of frequency and part and rotate mould and will produce anisotropic resonant dispersion and absorption to the THz radiation, therefore, this crystal can be inhaled the ripple device and the THz polarizer uses at THz.The Zinc vitriol crystal can be by the preparation of saturated solution falling temperature method, and suitable initial temperature is for being higher than room temperature 30
oC～40
oC, rate of temperature fall are 0.5
oC/h～1
oC/h.
Embodiment 4
The bitter salt crystal belongs to rhombic system, and symmetry is also lower, so the dielectric response of its Terahertz and optical property also present the anisotropy characteristics.And the low frequency lattice vibration mould in the crystal and part rotate mould and be in the THz range of frequency, will produce anisotropic resonant dispersion and absorption to the THz radiation, and therefore, this crystal is inhaled at THz and had application prospect aspect ripple device and the THz polarizer.The saturated solution falling temperature method preparation that the bitter salt crystal by adopting is traditional, the initial soln temperature is generally 50
oC～40
oC, rate of temperature fall are 0.5
oC/h～1
oC/h.
Claims (5)
1. the preparation method of a Terahertz frequency range anisotropic medium crystal is characterized in that, 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
oC～40
oC hangs seed crystal and places it in the crystal growing furnace in solution, be down to room temperature then, and rate of temperature fall is 0.5
oC/h～2
oC/h can obtain target Terahertz frequency range anisotropic medium crystal;
Described crystal has three tiltedly, monocline, water chestnut side, six sides or orthorhombic body structure;
The size of described crystal is not less than 5 mm * 5 mm * 1 mm.
2. preparation method according to claim 1, it is characterized in that: described crystal is Salzburg vitriol crystal, SODIUMNITRATE crystal, Zinc vitriol crystal or bitter salt crystal.
3. the characterizing method of a Terahertz frequency range anisotropic medium crystal is characterized in that, concrete scheme is as follows:
On X ray monocrystalline direction finder, Terahertz frequency range anisotropic medium crystal is carried out orientation, do cutting and polished finish then in the desired direction; Crystal prototype after the polishing is fixed to planar rotates at any angle on the specimen holder, at its time-domain spectroscopy of transmission-type terahertz time-domain spectroscopy test, obtain frequency domain spectrum by Fast Fourier Transform (FFT); Amplitude part and phase information by frequency domain spectrum solve dielectric parameter and the optical constant of crystal on specific direction; After sample turned an angle, test the time domain spectrum again, do Fast Fourier Transform (FFT) and handle, find the solution electromagnetic parameter; Obtain dielectric parameter and the optical constant of any direction in the crystallographic plane thus.
4. the application method of a Terahertz frequency range anisotropic medium crystal, it is characterized in that: described crystal is for the preparation of the Terahertz device.
5. application method according to claim 4 is characterized in that: described Terahertz device is that Terahertz is inhaled ripple device, terahertz polarization device or Terahertz beam splitter.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110297337A (en) * | 2019-06-26 | 2019-10-01 | 天津大学 | Two selenizing rhenium nanometer sheet terahertz polarization modulation devices of regulating and controlling voltage |
| CN111708114A (en) * | 2020-07-22 | 2020-09-25 | 福州大学 | Terahertz polaroid preparation method based on magnetic liquid |
| CN113571919A (en) * | 2021-07-07 | 2021-10-29 | 佛山(华南)新材料研究院 | Wave absorbing device and preparation method thereof |
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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 |
| CN113571919A (en) * | 2021-07-07 | 2021-10-29 | 佛山(华南)新材料研究院 | Wave absorbing device and preparation method thereof |
| 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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