CN203365739U - Terahertz wave transmitting/receiving integration module - Google Patents
Terahertz wave transmitting/receiving integration module Download PDFInfo
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- CN203365739U CN203365739U CN 201320308056 CN201320308056U CN203365739U CN 203365739 U CN203365739 U CN 203365739U CN 201320308056 CN201320308056 CN 201320308056 CN 201320308056 U CN201320308056 U CN 201320308056U CN 203365739 U CN203365739 U CN 203365739U
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Abstract
The utility model provides a novel terahertz wave transmitting/receiving integration module which is simple in structure, good in stability, and low in cost. The terahertz wave transmitting/receiving integration module comprises a polarization-maintaining single mode fiber, an optical fiber coupling antenna module, and a terahertz lens, wherein the polarization-maintaining single mode fiber, the optical fiber coupling antenna module and the terahertz lens are sequentially arranged. The optical fiber coupling antenna module comprises a photoconductive antenna substrate, a super hemispherical silicon lens, and an antenna electrode, wherein the antenna electrode and the super hemispherical silicon lens are respectively fixed on the front and back end faces of the photoconductive antenna substrate in a bonding manner through optical adhesive. The refractive index of the optical adhesive is the same as the refractive index of a polarization-maintaining single mode fiber material. The tail fiber of the polarization-maintaining single mode fiber is aligned with a gap of the antenna electrode. The width of the gap of the antenna electrode is corresponding to the core diameter of the tail fiber. The output end face of the tail fiber, the gap of the antenna electrode, the super hemispherical silicon lens and the terahertz lens are coaxial. The integration module provided by the utility model is used for producing a terahertz wave, and can also be used for detecting the terahertz wave, with need of the adjustment of a connection mode of the integration module with external equipment and the adjustment of an application environment.
Description
Technical field:
The utility model relates to a kind of wide spectrum THz wave transmit/receive module.
Background technology:
At present, the terahertz time-domain spectroscopy system all has very large development potentiality and application prospect in a lot of fields, for example biomedicine, analysis of the molecular structure, Non-Destructive Testing, safety inspection, and the drugs discriminating etc.Wherein typical terahertz time-domain spectroscopy system mainly is comprised of four parts: femtosecond pulse excitaton source, time delay system, terahertz emission source, and terahertz detector.At present, this cover system is due to bulky, system complex, poor stability, cost costliness, and the self-defects such as impact that easily are subject to environment, mainly is confined to use under laboratory condition, has limited to a great extent its commercialization and society generalization.Therefore, a lot of experts and scholars propose to utilize the optical delivery element in the optical fiber alternative system, transfer the spatial light transmission to Optical Fiber Transmission, have dwindled to a great extent system bulk, improved system stability and anti-environmental interference ability, this system also is commonly called as fiberize terahertz time-domain spectroscopy system.
The utility model relates generally to the terahertz transmitter in the time-domain spectroscopy system, and the radiation mode of this class transmitter is the mode by the photoconductive antenna auxiliary radiation.At present, there have been experts and scholars to propose " pigtail formula " (pig-tail) terahertz transmitter, this transmitter utilizes optical fiber that femtosecond laser is delivered on photoconductive antenna, then by mechanical organ, regulates aiming at of laser and antenna electrode gap, finally by its encapsulation.This transmitter has strengthened the dirigibility of whole system to a certain extent, for industrialization, positive effect is also arranged.But there are a lot of weak points in this " pigtail formula " terahertz transmitter, such as optical fiber is realized with aiming at by regulating mechanical organ of antenna, have directly affected the stability of system, and be easy to be subject to the impact of extraneous mechanical vibration; Simultaneously, its alignment procedures need to be focused on by condenser lens, and the restriction of numerical aperture further has influence on the focused spot size of antenna gap position, adds the absorption loss of self, finally has influence on the actual emanations energy density in antenna gap.On the other hand, the output terminal of this transmitter is not introduced optical focusing system, and just the super hemisphere silicon lens of simple utilization carries out beam shaping, and this mode directly has influence on efficiency of energy collection and the optical transfer characteristic of terahertz radiation.
The utility model content:
In order to solve, " pigtail formula " terahertz transmitter poor stability, light path are difficult to be adjusted, and the inherent shortcoming such as complex structure, and the utility model provides a kind of simple in structure, good stability, novel terahertz sources integration module with low cost.
Technical solutions of the utility model are as follows:
A kind of THz wave transmitting/receiving integration module, comprise the polarization-maintaining single-mode fiber, coupling fiber Anneta module and the Terahertz lens that set gradually; Wherein, the coupling fiber Anneta module comprises photoconductive antenna substrate, super hemisphere silicon lens, antenna electrode, described antenna electrode and super hemisphere silicon lens adopt optical cement to be adhesively fixed respectively in front end face and the rear end face of photoconductive antenna substrate, and the refractive index of this optical cement is identical with the refractive index of polarization-maintaining single-mode fiber material; The tail optical fiber of polarization-maintaining single-mode fiber is aimed at the antenna electrode gap, the core diameter of the corresponding described tail optical fiber of the width in described antenna electrode gap; The output end face of tail optical fiber, antenna electrode gap, super hemisphere silicon lens and Terahertz lens are coaxial.
Based on above-mentioned basic scheme, the utility model also is further optimized to improve and defined as follows:
During as THz wave emission integration module, above-mentioned antenna electrode is connected to bias voltage (bias electrode); While as THz wave, receiving integration module, above-mentioned antenna electrode is electrically connected to micro current amplifier.
Be provided with vertically to reinforce tail optical fiber and the bonding optical fiber fixing hoop of photoconductive antenna substrate at the front end face of above-mentioned antenna electrode.
The material selection GaAs grown at low temperature semiconductor of above-mentioned photoconductive antenna substrate, physical dimension is 10mm * 10mm.This material has absorption more by force for the laser emission of 800nm, and has very short carrier lifetime and carrier mobility.
Above-mentioned optical cement adopts UV optical cement (refractive index is 1.54); The tail optical fiber length of polarization-maintaining single-mode fiber is 20cm, and preferably the work centre wavelength of tail optical fiber is 780nm, can adopt model: Nufern PM780-HP.
The diameter of above-mentioned super hemisphere silicon lens is 7mm, and thickness is 4.2mm, and the photoconductive antenna substrate thickness is 0.5mm; The aperture of above-mentioned Terahertz lens is 7mm, and focal length is 100mm.
The material of above-mentioned super hemisphere silicon lens can adopt High Resistivity Si, and diameter is 7mm, and thickness is 4.2mm, and the photoconductive antenna substrate thickness is 0.5mm.(optical coupling system formed like this can be similar to the antenna electrode gap location terahertz emission concentration of energy of pointolite emission effectively at the dipped beam direction of principal axis, has improved the terahertz emission collection efficiency.) the Terahertz lens material selects high-density polyethylene material (HDPE), this material is to the terahertz emission substantially transparent.
The beneficial effects of the utility model are as follows:
1. this integration module is simple in structure, with low cost, and each building block of module is common components, is easy to processing.
2. this integration module both can be used for producing Terahertz, also can be used for surveying Terahertz, only needed connected mode and the applied environment adjusted with external unit to get final product.
3. it is directly that fiber end face and photoconductive antenna substrate is directly bonding that the coupling fiber Anneta module in this integration module adopts UV optical cement (n=1.54), optical focusing system and mechanical registeration system have been saved, improved the energy density of laser emission antenna gap, strengthen the stability of system, and be not vulnerable to the interference of external environment.
4. compare the antenna gap(antenna electrode gap that this integration module adopts with traditional dipole antenna electrode) width is 5 μ m, belongs to narrow gap antenna.
5. the output terminal of this integration module has been introduced the Terahertz condenser lens, can effectively THz wave be focused on to sample spot, and has very high transmitance, has improved the Terahertz efficiency of energy collection.
6. the use of this integration module, the dirigibility that has directly improved the terahertz time-domain spectroscopy system, can realize traverse measurement, in biomedicine, analysis of the molecular structure, Non-Destructive Testing, safety inspection, and the field such as drugs discriminating is with a wide range of applications.
The accompanying drawing explanation:
The structural representation that Fig. 1 is the terahertz time-domain spectroscopy system;
Fig. 2 is novel terahertz sources integration module structural representation of the present utility model;
Fig. 3 is novel terahertz sources integration module structural section schematic top plan view of the present utility model;
Fig. 4 is novel terahertz sources integration module schematic appearance of the present utility model;
Fig. 5 is the structural representation that transmitter module of the present utility model is transformed into detecting module;
Fig. 6 is photoconductive antenna metal electrode shape and structure schematic diagram in the utility model;
Fig. 7 is antenna shaft collar Facad structure schematic diagram in the utility model;
Fig. 8 is antenna shaft collar side structure schematic diagram in the utility model
Fig. 9 is terahertz emission time domain waveform figure of the present utility model;
Figure 10 is terahertz emission frequency-domain waveform figure of the present utility model;
The explanation of affix note:
1-femtosecond laser source; 2-optical fiber splitter; 3-time delay system; 4-polarization-maintaining single-mode fiber; 5-terahertz transmitter; 6-terahertz detector; 7-photoconductive antenna substrate; 8-super hemisphere silicon lens; 9-antenna electrode; 10-Terahertz lens; 11-antenna shaft collar; 12-bias electrode; 13-optical fiber fixing hoop; 14-optical fiber pigtail; 15-optical fiber adds fair platform; 16-bias line; 17-Metal Packaging box; 18-fixed screw; The 19-nut; 20-BNC connector; 21-tail optical fiber stationary pipes; 22-micro current amplifier; 23-antenna pickup groove; 24-fixing threaded hole; 25-lens fixed muffle;
Specific embodiments:
Fig. 1 is a set of complete terahertz time-domain spectroscopy system schematic.At first, femtosecond laser source 1 provides femto-second laser pulse output, and this output pulse enters optical fiber splitter 2 and is divided into two pulses, and a road is pump light, and another road is for surveying light.Two-way light is all to utilize single-mode fiber 4 to be transmitted, and laser pulse is delivered to respectively to terahertz sources module 5 and terahertz detector 6, wherein survey in light path and need to introduce a set of time delay system 3, this equipment is for realizing the time-sampling of terahertz signal.Provide a bias voltage at the outside transmitter 5 of giving of system, measure the photo-signal that terahertz detector 6 produces, this photo-signal is proportional to the THz radiation pulse signal.
Fig. 2 is that novel terahertz sources integration module parts of the present utility model form schematic diagram, critical piece comprises photoconductive antenna substrate 7, super hemisphere silicon lens 8, Terahertz lens 10, antenna shaft collar 11, optical fiber pigtail 14, bias line 16 etc., and photoconductive antenna substrate 7 and antenna electrode 9 are called photoconductive antenna altogether.Wherein photoconductive antenna substrate 7 is GaAs grown at low temperature (110) crystal, and this crystal has very short carrier lifetime and higher carrier mobility; Super hemisphere silicon lens 8 is close to the GaAs crystal back side, is positioned at crystal geometric center place, and the silicon lens diameter is 7mm, and the degree of depth is 4.2mm, and effect is near the dipped beam axle by more terahertz emission concentration of energy.The module end is used the Terahertz lens 10 of focal length 100mm, and material is high density polyethylene, and this material has very high transmitance, can effectively to thz beam, be focused on, and the focus place is the sample test point; Bias line 16 is used the square copper post that length is 10cm, and carries out insulation processing with the Metal Packaging box, and this copper post as the bias voltage lead-in wire, can play heat sink effect on the one hand on the other hand.
Fig. 3 is each parts cooperation figure after novel terahertz sources integration module of the present utility model is installed.The ultimate principle of transmitter module is to utilize optical fiber 14 that laser pulse is guided to antenna electrode gap, produces the photo-generated carrier motion, and recycling bias line 16 provides a unidirectional bias voltage to photoconductive antenna, forms photocurrent and to the external radiation THz wave.Then super hemisphere silicon lens 8 and the Terahertz lens 10 by the antenna back side focus on emittance the dipped beam direction of principal axis and focus on, and the focus place is sample spot.The outside drawing that Fig. 4 is novel terahertz sources integration module of the present utility model, be of a size of 100mm * 80mm * 60mm, simple in structure, with low cost, and dexterous light, stability is done, and is not vulnerable to the impact of external environment.
Another characteristics of the present utility model are exactly, and this transmitter also can transform terahertz wave detector as, and during as detector, bias electrode does not power up, directly with micro current amplifier 22, be connected, measure photo-signal, this photo-signal is proportional to the terahertz emission signal, and structural representation is shown in Fig. 5.The ultimate principle of detector is an inverse process of the transmitter course of work, it utilizes Terahertz lens 10 and super hemisphere silicon lens 8 to collect the terahertz emission ripple, the THz electric field of collecting acts on photoconductive antenna 7, cause the photo-generated carrier motion, form photocurrent, then by micro current amplifier 22, measured, measured current signal and terahertz emission field strength are proportional, finally utilize time delay system 3 to carry out equivalent time sampling, finally record the terahertz emission time-domain signal.
Referring to the coupling fiber Anneta module in Fig. 6 terahertz transmitter of the present utility model, this module will directly determine the radiation characteristic of transmitter and the stability characteristic (quality) of module.These parts relate to photoconductive antenna substrate 7, super hemisphere silicon lens 8, antenna electrode 9, optical fiber fixing hoop 13 and optical fiber pigtail 14.In order to obtain the radiant output of ceiling capacity, at first must meet fiber-optic output face, antenna gap, the super hemisphere silicon lens centre of sphere coaxial, this can utilize coaxial processing to assist.Secondly, in order to obtain higher system stability and anti-external interference ability, optical fiber, antenna, silicon lens stably need to be fixed together.The utility model has been taked the means different from mechanical connection in the past, directly uses the UV optical cement that the three is directly bonding, and the refractive index of this glue is 1.54, and just identical with the fiber optic materials refractive index, the method can effectively reduce the reflection loss of bonding place.Realize one-shot forming, during use, without being regulated, stability is high and be not vulnerable to the impact of external environment again.Wherein metal electrode is typical junction electrode, and electrode gap width is 5 μ m, and this width is the core diameter of corresponding optical fiber just in time; The effect of optical fiber fixing hoop 13 is reinforce optical fiber and photoconductive antenna substrate bonding.
Fig. 7 and Fig. 8 are respectively Facad structure figure and the construction profile of antenna shaft collar 11, and the outer disc radius is 25mm, and antenna pickup groove 23 is of a size of 10mm * 10mm, and the diameter of lens fixed lens barrel 25 is 10mm.During installation, use UV optics to solidify glue (n=1.54) and directly photoconductive antenna substrate 7 is adhered to antenna pickup groove 23 bottoms, note when bonding smearing evenly and have higher flatness, thickness is less than 0.1mm.Then by screw 24, the antenna shaft collar is fixed on the encapsulation box, finally the PE lens is fixed to lens barrel 29 tops.Directly antenna electrode 9 and bias electrode 12 are welded and fixed during work.
Basic functional principle and correlated results:
Titanium sapphire femto-second laser 1 is the output femto-second laser pulse outwards, this laser pulse is divided into two-way light through optical fiber splitter 2, one tunnel is pump light, another road is for surveying light, the optical path difference of two-way is no more than 5cm, pump light imports terahertz sources module 5 into through polarization-maintaining single-mode fiber 4, under the effect of applying bias electric field to the external radiation THz wave.Simultaneously, collect this terahertz emission electric field at other end terahertz detector 6, the motion that causes photo-generated carrier on photoconductive antenna forms photocurrent, and photo-signal enters micro current amplifier 22 is amplified, and finally by lock-in amplifier, carries out signal extraction.Utilize time delay system 3 to carry out equivalent time sampling, can obtain the time domain waveform figure of terahertz emission, as shown in Figure 9.Then resulting time domain waveform figure is carried out to Fast Fourier Transform (FFT), can obtain the frequency domain spectrogram of terahertz emission, spectral range is 0.1THz-10THz, as shown in figure 10.With respect to traditional " pigtail formula " terahertz transmitter and detector (<4THz), spectral width has obtained very large expansion, can realize the wide range measurement.Therefore, novel terahertz sources of the present utility model/detection integration module is in biomedicine, analysis of the molecular structure, Non-Destructive Testing, safety inspection, and the field such as drugs discriminating has good development potentiality and application prospect.
Claims (6)
1. a THz wave transmitting/receiving integration module, is characterized in that: comprise the polarization-maintaining single-mode fiber, coupling fiber Anneta module and the Terahertz lens that set gradually; Wherein, the coupling fiber Anneta module comprises photoconductive antenna substrate, super hemisphere silicon lens, antenna electrode, described antenna electrode and super hemisphere silicon lens adopt optical cement to be adhesively fixed respectively in front end face and the rear end face of photoconductive antenna substrate, and the refractive index of this optical cement is identical with the refractive index of polarization-maintaining single-mode fiber material; The tail optical fiber of polarization-maintaining single-mode fiber is aimed at the antenna electrode gap, the core diameter of the corresponding described tail optical fiber of the width in described antenna electrode gap; The output end face of tail optical fiber, antenna electrode gap, super hemisphere silicon lens and Terahertz lens are coaxial.
2. THz wave transmitting/receiving integration module according to claim 1 is characterized in that: as THz wave emission integration module, described antenna electrode is connected to bias voltage; Receive integration module as THz wave, described antenna electrode is electrically connected to micro current amplifier.
3. THz wave transmitting/receiving integration module according to claim 1 and 2 is characterized in that: at the front end face of described antenna electrode, be provided with vertically to reinforce tail optical fiber and the bonding optical fiber fixing hoop of photoconductive antenna substrate.
4. THz wave transmitting/receiving integration module according to claim 3, it is characterized in that: the material of described photoconductive antenna substrate is the GaAs grown at low temperature semiconductor, physical dimension is 10mm * 10mm.
5. THz wave transmitting/receiving integration module according to claim 3, is characterized in that: described optical cement employing UV optical cement; The tail optical fiber length of the tail optical fiber of described polarization-maintaining single-mode fiber is 20cm.
6. THz wave transmitting/receiving integration module according to claim 3, it is characterized in that: the diameter of described super hemisphere silicon lens is 7mm, and thickness is 4.2mm, and the photoconductive antenna substrate thickness is 0.5mm; The aperture of described Terahertz lens is 7mm, and focal length is 100mm.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278893A (en) * | 2013-05-30 | 2013-09-04 | 中国科学院西安光学精密机械研究所 | Terahertz wave emitting/receiving integration module |
| CN104849780A (en) * | 2015-05-29 | 2015-08-19 | 中国工程物理研究院激光聚变研究中心 | Terahertz-wave optical lens and terahertz-wave system |
| CN105870582A (en) * | 2016-05-24 | 2016-08-17 | 深圳市太赫兹系统设备有限公司 | Terahertz near field probe, photoconductive antenna and manufacture method of photoconductive antenna |
| CN106299978A (en) * | 2016-10-18 | 2017-01-04 | 深圳市太赫兹科技创新研究院有限公司 | Terahertz generation system based on unidirectional carrier transport photodetector |
| CN106645017A (en) * | 2016-12-28 | 2017-05-10 | 宝鸡文理学院 | Cage-structured fiber-based terahertz time-domain spectroscopy system provided with waveguide test module |
| CN107860742A (en) * | 2017-11-03 | 2018-03-30 | 中国科学院重庆绿色智能技术研究院 | A kind of reflective terahertz time-domain near-field scan microscope |
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2013
- 2013-05-30 CN CN 201320308056 patent/CN203365739U/en not_active Withdrawn - After Issue
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103278893A (en) * | 2013-05-30 | 2013-09-04 | 中国科学院西安光学精密机械研究所 | Terahertz wave emitting/receiving integration module |
| CN103278893B (en) * | 2013-05-30 | 2014-12-10 | 中国科学院西安光学精密机械研究所 | Terahertz wave emitting/receiving integration module |
| CN104849780A (en) * | 2015-05-29 | 2015-08-19 | 中国工程物理研究院激光聚变研究中心 | Terahertz-wave optical lens and terahertz-wave system |
| CN105870582A (en) * | 2016-05-24 | 2016-08-17 | 深圳市太赫兹系统设备有限公司 | Terahertz near field probe, photoconductive antenna and manufacture method of photoconductive antenna |
| CN105870582B (en) * | 2016-05-24 | 2017-07-18 | 深圳市太赫兹系统设备有限公司 | Terahertz near-field probe, photoconductive antenna and preparation method thereof |
| WO2017201888A1 (en) * | 2016-05-24 | 2017-11-30 | 深圳市太赫兹系统设备有限公司 | Tetrahertz near-field detector, photoconductive antenna, and manufacturing method thereof |
| CN106299978A (en) * | 2016-10-18 | 2017-01-04 | 深圳市太赫兹科技创新研究院有限公司 | Terahertz generation system based on unidirectional carrier transport photodetector |
| CN106645017A (en) * | 2016-12-28 | 2017-05-10 | 宝鸡文理学院 | Cage-structured fiber-based terahertz time-domain spectroscopy system provided with waveguide test module |
| CN106645017B (en) * | 2016-12-28 | 2019-06-11 | 宝鸡文理学院 | Cage construction optical fiber terahertz time-domain spectroscopy system with waveguide test module |
| CN107860742A (en) * | 2017-11-03 | 2018-03-30 | 中国科学院重庆绿色智能技术研究院 | A kind of reflective terahertz time-domain near-field scan microscope |
| CN107860742B (en) * | 2017-11-03 | 2020-04-07 | 中国科学院重庆绿色智能技术研究院 | Reflective terahertz time-domain near-field scanning microscope |
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