CN102192884A - Method for imaging of samples by using polarization controllable terahertz waves - Google Patents
Method for imaging of samples by using polarization controllable terahertz waves Download PDFInfo
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- CN102192884A CN102192884A CN2011100605161A CN201110060516A CN102192884A CN 102192884 A CN102192884 A CN 102192884A CN 2011100605161 A CN2011100605161 A CN 2011100605161A CN 201110060516 A CN201110060516 A CN 201110060516A CN 102192884 A CN102192884 A CN 102192884A
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Abstract
The invention discloses a method for imaging of samples by using polarization controllable terahertz waves, comprising the following steps: when the polarization state of terahertz waves is linear polarization, the polarization direction is adjusted to a horizontal direction, an image of horizontal terahertz waves formed after interacting with the tested samples is measured; the polarization direction is adjusted to a vertical direction, an image of vertical terahertz waves formed after interacting with the tested samples is measured. Two images of terahertz waves are analyzed, because the reception signal is strong, the image of horizontal terahertz waves can reflect the intensity changes after interacting with the samples; and the image of vertical terahertz waves can reflect the minute changes of the polarization of terahertz waves caused by samples.
Description
Technical field
The present invention relates to the THz wave imaging field, sample is carried out imaging method in particular to a kind of controlled THz wave of polarization of utilizing.
Background technology
Terahertz emission is worth and wide application prospect and have great scientific research at aspects such as satellite communication, Non-Destructive Testing, military radars because it has unique character such as transient state, low energy and coherence.The making of terahertz polarization measurement, Terahertz communication, biomedical imaging, military target identification, chemical composition analysis and Terahertz filter plate etc. all needs the polarization direction of THz wave is accurately controlled.
Excite the polarization direction of the terahertz emission that air plasma produces by double-frequency laser by research, can change the polarization direction of the THz wave of the control of the relative phase between the fundamental wave and second harmonic radiation in the four-wave mixing, utilize the controlled THz wave of this polarization to carry out polarization imaging object.
In the imaging technique that adopts the electro-optic sampling detection method, the feature of the formation method that exists is only to survey Terahertz electric field intensity component in one direction at present, this just makes some imaging results be difficult to truly be explained, causes the sample image information that obtains comparatively limited.For example, generally be interpreted as that with respect to the reduction of the amplitude of the electric field intensity of reference signal sample causes for the absorption and the scattering of terahertz emission, but in fact, the rotation of Terahertz electric field intensity can cause reducing of this detected intensity equally for sample signal.So present formation method can not be considered the birefringent characteristic of sample for THz wave, and, except birefringence effect, the reflection after the oblique incidence and repeatedly scattering all may cause the change of Terahertz direction of an electric field.
Summary of the invention
The invention provides a kind of controlled THz wave of polarization of utilizing sample is carried out imaging method,, obtain more images information in order to the subtle change that the terahertz polarization attitude that causes per sample takes place.
For achieving the above object, the invention provides a kind of controlled THz wave of polarization of utilizing sample is carried out imaging method, it may further comprise the steps: when the polarization state of THz wave is linear polarization, the polarization direction is adjusted into horizontal direction, the horizontal component of the THz wave after measurement interacts with sample; Terahertz pulse to horizontal component is analyzed, and obtains the subject image of horizontal polarization THz wave incident; When the polarization state of THz wave is linear polarization, be vertical direction with the polarization direction, the horizontal component of the THz wave after measurement interacts with sample; Terahertz pulse to horizontal component is analyzed, and obtains the subject image of vertical polarization THz wave incident.
Polarization state in THz wave is a linear polarization, the polarization direction is adjusted into the horizontal direction step to be comprised: mobile BBO (barium metaborate) crystal is to change the distance of bbo crystal to plasma, the polarization direction of THz wave is controlled to be horizontal direction, wherein, the position of horizontal direction correspondence electro-optic sampling for along the position of direction of beam propagation scanning bbo crystal the time is surveyed the position of the bbo crystal of the THz wave intensity maximum that obtains.
When the polarization state of THz wave is linear polarization, the polarization direction is adjusted into the vertical direction step to be comprised: mobile bbo crystal is to change the distance of bbo crystal to plasma, the polarization direction of THz wave is controlled to be vertical direction, wherein, the position of vertical direction correspondence electro-optic sampling for along the position of direction of beam propagation scanning bbo crystal the time is surveyed the position of the bbo crystal of the THz wave intensity minimum that obtains.
Control the position of mobile bbo crystal by accurate translation stage.
When the polarization state of THz wave is linear polarization, the polarization direction is adjusted into the horizontal direction step to be comprised: by add the quartz crystal of a pair of wedge shape between bbo crystal and plasma, adjust its position of inserting in light beam the polarization direction of THz wave is controlled to be horizontal direction.
The polarization state of THz wave is controlled to be linear polarization, the polarization direction is adjusted into the vertical direction step to be comprised: by add the quartz crystal of a pair of wedge shape between bbo crystal and plasma, adjust its position of inserting in light beam the polarization direction of THz wave is controlled to be vertical direction.
Sample is for causing the object of terahertz polarization attitude generation subtle change after interacting with THz wave.
In the above-described embodiments, two width of cloth Terahertz images that obtain are analyzed, the image that the THz wave incident of horizontal polarization obtains because received signal is stronger, can reflect with sample effect after the variation that takes place of intensity; The image that the THz wave incident of vertical polarization obtains can reflect the subtle change of the terahertz polarization generation that sample causes, the for example edge scatter of sample and sample anisotropy etc., thereby improved the imaging resolution of sample and obtained more sample interior information, overcome electro-optic sampling detection method in the prior art and can not analyze the revolving property of Terahertz electric field intensity, caused the sample interior information limited problem of the image reflection of obtaining.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is for to utilize the controlled THz wave of polarization object to be carried out the device synoptic diagram of imaging according to an embodiment of the invention;
Fig. 2 is that the angle of the polarization direction of THz wave according to an embodiment of the invention and horizontal direction and bbo crystal are to the graph of a relation between the distance of plasma;
Fig. 3 sees through azimuthal graph of a relation of the transmitance and the material fiber orientation of anisotropic foam materials for the THz wave of incident is under horizontal polarization and vertical two kinds of situations of polarization;
Fig. 4 is the optical photograph of sample and the Terahertz design sketch that sample is carried out two-dimensional imaging.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not paying the every other embodiment that is obtained under the creative work prerequisite.
Below by specifically to the description of polarization direction High Accuracy Control, utilize the controlled THz wave of polarization that object is carried out imaging method to be further described to of the present invention.
Fig. 1 is for to utilize the controlled THz wave of polarization object to be carried out the device synoptic diagram of imaging according to an embodiment of the invention.Each device is as follows among Fig. 1: 1, lens; 2, bbo crystal; 3, high-accuracy linear translation platform; 4, polyfluortetraethylene plate; 5, throw the face mirror; 6, sample; 7, electro-conductive glass (ITO); 8, ZnTe crystal; 9, catoptron; 10, quarter-wave plate; 11, Wollaston prism; 12, difference detector.In an embodiment of the present invention, adopt double-frequency laser to excite the air induced plasma to produce THz wave, in the present embodiment, the LASER Light Source that the technology that double-frequency laser excites air plasma to produce Terahertz is used is the femtosecond laser amplifier that Spectra-Physics produces, its laser pulse average output power is 3.5W, repetition frequency 1KHz, centre wavelength 800nm, pulsewidth 50fs.LASER Light Source can also be selected the laser instrument that produces other wavelength lasers for use.
Femto-second laser pulse is divided into two-beam through beam splitting chip, and a branch of light has most energy of incident laser, carry out frequency multiplication by bbo crystal after, the fundamental frequency glistening light of waves and frequency doubled light focus on back mixing mutually, excite THz wave; Another bundle low power laser passes through crystal detection as detecting light beam and THz wave conllinear.In crystal detection, the Terahertz electric field changes the index ellipsoid of crystal, thereby the polarization state of outgoing detecting light beam is changed.Detecting light beam is surveyed by difference detector through being divided into horizontal polarization and vertical polarization two bundles by wollaston prism behind the quarter-wave plate.
Excite air to produce in the mechanism of plasma generation THz wave based on double-frequency laser, when fundamental frequency only during linearly polarized light, the THz wave that excites also is a linear polarization.Along with the variation of the relative phase of fundamental frequency light and frequency doubled light, the polarization direction of THz wave can change 2 π continuously.The relative phase of fundamental frequency light and frequency doubled light is along with bbo crystal is different and change to the distance of focus, and the variation of the relative phase of fundamental frequency light and frequency doubled light is proportional to the variation of the position of bbo crystal.When the position of bbo crystal recurred variation, the polarization direction of THz wave also can recur variation, and we can utilize this method to come the polarization direction of the THz wave of high-precision control radiation.
Utilize the controlled THz wave of polarization that sample is carried out imaging method according to an embodiment of the invention, may further comprise the steps:
S102 when the polarization state of THz wave is linear polarization, is adjusted into horizontal direction with the polarization direction, the horizontal component of the THz wave after measurement interacts with sample;
S104 analyzes the terahertz pulse of horizontal component, obtains the subject image of horizontal polarization THz wave incident;
S106 when the polarization state of THz wave is linear polarization, is a vertical direction with the polarization direction, the horizontal component of the THz wave after measurement interacts with sample;
S108 analyzes the terahertz pulse of vertical component, obtains the subject image of vertical polarization THz wave incident.
In the present embodiment, can adopt the electro-optic sampling Detection Techniques that the component of THz wave on a certain direction measured, this is because the electro-optic sampling Detection Techniques can only be measured the component of THz wave on a certain direction, if the crystallographic axis of electro-optic crystal is arranged on the direction of measuring the THz wave horizontal component, then when the incident THz wave was vertical polarization, the terahertz polarization that is caused by sample can accurately measure to the small deflection that horizontal direction takes place.Equally, if the crystallographic axis of electro-optic crystal is arranged on the direction of measuring the THz wave vertical component, then when the incident THz wave was horizontal polarization, the terahertz polarization that is caused by sample can accurately measure to the small deflection that vertical direction takes place.
In the present embodiment, two width of cloth Terahertz images that obtain are analyzed, the image that the THz wave incident of horizontal polarization obtains because received signal is stronger, can reflect with sample effect after the variation that takes place of intensity; The image that the THz wave incident of vertical polarization obtains can reflect the subtle change of the terahertz polarization generation that sample causes, the for example edge scatter of sample and sample anisotropy etc., thereby improved the imaging resolution of sample and obtained more sample interior information, overcome electro-optic sampling detection method in the prior art and can not analyze the revolving property of Terahertz electric field intensity, caused the sample interior information limited problem of the image reflection of obtaining.
In an embodiment of the present invention, utilize the THz wave of different polarization direction that object is carried out two-dimensional imaging, horizontal polarization and vertical polarization are preferable selection, and this is because other polarization direction also can decompose on this both direction.
For example, can control the polarization direction of THz wave to the position of plasma by adjusting bbo crystal.Along the position of direction of beam propagation scanning bbo crystal, the bbo crystal position when the THz wave intensity that finds the electro-optic sampling detection to obtain is minimum and maximum, the polarization direction of the corresponding THz wave that is produced is horizontal direction and vertical direction respectively.
Fig. 2 is that the angle of the polarization direction of THz wave according to an embodiment of the invention and horizontal direction and bbo crystal are to the graph of a relation between the distance of plasma.Shown among the figure change bbo crystal to plasma apart from the time, the polarization direction of THz wave is with respect to the consequential variation of the angle of horizontal direction.In experimental provision shown in Figure 1, continuously change bbo crystal to plasma apart from d, measure the polarization angle of THz wave under the different distance d respectively, can obtain curve shown in Fig. 2.The method of wherein measuring the polarization angle of THz wave is a prior art, does not repeat them here.
From Fig. 2, can draw, when bbo crystal when the distance of plasma is 48mm, the polarization angle of THz wave is 90 ° (polarization direction is a vertical direction); When bbo crystal when the distance of plasma is 60mm, the polarization angle of THz wave is 0 ° (polarization direction is a horizontal direction).
Correspondingly, when the polarization state of THz wave is linear polarization, the polarization direction is adjusted into the horizontal direction step to be comprised: mobile bbo crystal is to change the distance of bbo crystal to plasma, the polarization direction of THz wave is controlled to be horizontal direction, wherein, the position of horizontal direction correspondence electro-optic sampling for along the position of direction of beam propagation scanning bbo crystal the time is surveyed the position of the bbo crystal of the THz wave intensity maximum that obtains.
Correspondingly, when the polarization state of THz wave is linear polarization, the polarization direction is adjusted into the vertical direction step to be comprised: mobile bbo crystal is to change the distance of bbo crystal to plasma, the polarization direction of THz wave is controlled to be vertical direction, wherein, the position of vertical direction correspondence electro-optic sampling for along the position of direction of beam propagation scanning bbo crystal the time is surveyed the position of the bbo crystal of the THz wave intensity minimum that obtains.
For example, for accurately controlling the polarization direction of the THz wave of radiation, exciting air plasma to produce in the mechanism of THz wave based on double-frequency laser, bbo crystal can be fixed on the accurate motorized precision translation stage of one dimension, accurately control the distance of bbo crystal to plasma by moving of translation stage.
Again for example, also can be by between bbo crystal and plasma, inserting the quartz crystal of a pair of wedge shape, insert the polarization direction that THz wave is accurately controlled in position in light beam by adjusting it.
Correspondingly, polarization state in THz wave is a linear polarization, the polarization direction is adjusted into the horizontal direction step to be comprised: by add the quartz crystal of a pair of wedge shape between bbo crystal and plasma, adjust its position of inserting in light beam the polarization direction of THz wave is controlled to be horizontal direction.
Correspondingly, the polarization state of THz wave is controlled to be linear polarization, the polarization direction is adjusted into the vertical direction step to be comprised: by add the quartz crystal of a pair of wedge shape between bbo crystal and plasma, adjust its position of inserting in light beam the polarization direction of THz wave is controlled to be vertical direction.
In an embodiment of the present invention, sample is for causing the object of terahertz polarization attitude generation subtle change after interacting with THz wave.
Fig. 3 sees through azimuthal graph of a relation of the transmitance and the material fiber orientation of anisotropic foam materials for the THz wave of incident is under horizontal polarization and vertical two kinds of situations of polarization.Transmitance and azimuthal measuring and calculating are state of the art, repeat no more in the present invention.
Fig. 4 is the optical photograph of sample and the Terahertz design sketch that sample is carried out two-dimensional imaging.Wherein, left side figure is the optical photograph of sample, and sample is bonding the forming of space flight foam even by two thickness but that the fiber orientation is different, and dash area (imaging region) has been indicated the zone of THz wave scanning.Right figure is the Terahertz image that left figure sample is carried out the controlled imaging of polarization, and top is the Terahertz image of horizontal polarization for the incident THz wave, and the bottom is the Terahertz image of vertical polarization for the incident THz wave.By two width of cloth Terahertz images are analyzed, can obtain more information about space flight foam 1 and space flight foam 2 bondings.
Above-mentioned formation method of the present invention is applicable to difference diode receiving system and the focal plane Real Time Image System that adopts the electro-optic sampling detection method.
One of ordinary skill in the art will appreciate that: accompanying drawing is the synoptic diagram of an embodiment, and module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
One of ordinary skill in the art will appreciate that: the module in the device among the embodiment can be described according to embodiment and be distributed in the device of embodiment, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of programmed instruction, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that previous embodiment is put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of embodiment of the invention technical scheme.
Claims (7)
1. one kind is utilized the controlled THz wave of polarization that sample is carried out imaging method, it is characterized in that, may further comprise the steps:
When the polarization state of THz wave is linear polarization, the polarization direction is adjusted into horizontal direction, the horizontal component of the THz wave after measurement interacts with sample;
Terahertz pulse to described horizontal component is analyzed, and obtains the subject image of horizontal polarization THz wave incident;
When the polarization state of THz wave is linear polarization, be vertical direction with the polarization direction, the horizontal component of the THz wave after measurement interacts with sample;
Terahertz pulse to described horizontal component is analyzed, and obtains the subject image of vertical polarization THz wave incident.
2. method according to claim 1 is characterized in that, is linear polarization in the polarization state of THz wave, the polarization direction is adjusted into the horizontal direction step comprises:
Mobile bbo crystal is to change the distance of bbo crystal to plasma, the polarization direction of THz wave is controlled to be horizontal direction, wherein, the position of described horizontal direction correspondence electro-optic sampling for along the position of direction of beam propagation scanning bbo crystal the time is surveyed the position of the bbo crystal of the THz wave intensity maximum that obtains.
3. method according to claim 1 is characterized in that, when the polarization state of THz wave is linear polarization, the polarization direction is adjusted into the vertical direction step comprises:
Mobile bbo crystal is to change the distance of bbo crystal to plasma, the polarization direction of THz wave is controlled to be vertical direction, wherein, the position of described vertical direction correspondence electro-optic sampling for along the position of direction of beam propagation scanning bbo crystal the time is surveyed the position of the bbo crystal of the THz wave intensity minimum that obtains.
4. according to claim 2 or 3 described methods, it is characterized in that, control the position of mobile bbo crystal by accurate translation stage.
5. method according to claim 1 is characterized in that, is linear polarization in the polarization state of THz wave, the polarization direction is adjusted into the horizontal direction step comprises:
By between bbo crystal and plasma, adding the quartz crystal of a pair of wedge shape, adjust its position of inserting in light beam the polarization direction of THz wave is controlled to be horizontal direction.
6. method according to claim 1 is characterized in that, the polarization state of THz wave is controlled to be linear polarization, the polarization direction is adjusted into the vertical direction step comprises:
By between bbo crystal and plasma, adding the quartz crystal of a pair of wedge shape, adjust its position of inserting in light beam the polarization direction of THz wave is controlled to be vertical direction.
7. method according to claim 1 is characterized in that, described sample is for causing the object of terahertz polarization attitude generation subtle change after interacting with THz wave.
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| WO2013053168A1 (en) * | 2011-10-13 | 2013-04-18 | 中国科学院上海微系统与信息技术研究所 | Transmissive imaging apparatus and imaging method based on terahertz quantum device |
| CN103091255A (en) * | 2013-01-15 | 2013-05-08 | 首都师范大学 | Terahertz time-space resolution imaging system, imaging method and application thereof |
| CN103411903A (en) * | 2013-07-29 | 2013-11-27 | 南开大学 | THz radiation reinforcing method through light line array |
| CN106483096A (en) * | 2016-11-25 | 2017-03-08 | 首都师范大学 | The system and method that laser excitation air plasma produces high intensity THz wave |
| CN107015414A (en) * | 2016-01-28 | 2017-08-04 | 首都师范大学 | A kind of system and method for changing terahertz polarization state |
| CN113720784A (en) * | 2021-10-11 | 2021-11-30 | 阜阳师范大学 | Chromium-based spinel test system based on terahertz waveband magneto-optical spectrum |
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| CN113720784A (en) * | 2021-10-11 | 2021-11-30 | 阜阳师范大学 | Chromium-based spinel test system based on terahertz waveband magneto-optical spectrum |
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