CN209232819U - Terahertz detector - Google Patents
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- CN209232819U CN209232819U CN201822243302.8U CN201822243302U CN209232819U CN 209232819 U CN209232819 U CN 209232819U CN 201822243302 U CN201822243302 U CN 201822243302U CN 209232819 U CN209232819 U CN 209232819U
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Abstract
A kind of terahertz detector is disclosed, which includes substrate；And at least one probe unit, each probe unit includes: channel material, the channel material setting is on the substrate, two electrodes, two electrodes respectively with the both ends Ohmic contact of the longitudinal direction of the channel material, and three-dimensional grapheme, the three-dimensional grapheme and the direct or indirect thermal contact of the channel material.The detector is by solving the problems, such as channel material to THz wave incomplete absorption using three-dimensional grapheme as absorber, to effectively improve the response sensitivity of detector.
Description
Technical field
This disclosure relates to terahertz detection technical field more particularly to a kind of terahertz detector.
Background technique
THz wave is the general designation to the electromagnetic wave of a specific band, typically refer to frequency of oscillation 0.1THz~
Electromagnetic wave between 10THz.Due to being in the specific position of electromagnetic spectrum, THz wave good, single photon energy with penetration performance
The features such as low, spectral information is abundant is measured, there is important application value in fields such as safety check imaging, spectrographic detection, information communications.
Currently, including field-effect tube detector, Hylobitelus xiaoi, Terahertz using more room temperature terahertz detector
Detector etc. is several.Hylobitelus xiaoi and field-effect tube detector can obtain higher detectivity, but its frequency at present
Spectrum response range is only limited to 1THz or less wave band, and the requirement to processing technology is higher.Terahertz detector has response frequency
The advantages that bandwidth, stability are good, to be easy to array integrated, is the room temperature terahertz detector nearest apart from commercial applications, by
The extensive concern of scientific research personnel.However, the channel material of current terahertz detector is lower to THz wave absorption efficiency,
Fuel factor response is slower, and generally has that gain multiplying power is insufficient, processing technology is complicated, is difficult to apply to terahertz wave band etc. and ask
Topic.In addition, traditional light electrothermic type detector generally requires THz electric field asymmetricly to irradiate channel material two sides, to obtain
Asymmetrical thermo parameters method, this severely limits the practicalities and integration.
Utility model content
The purpose of the disclosure aims to solve the problem that at least one aspect of the above-mentioned problems in the prior art and defect.
Embodiment according to one aspect of the disclosure provides a kind of terahertz detector, comprising:
Substrate；And
At least one probe unit, each probe unit include:
Channel material, the channel material are arranged on the substrate,
Two electrodes, two electrodes respectively with the both ends Ohmic contact of the longitudinal direction of the channel material, and
Three-dimensional grapheme, the three-dimensional grapheme and the direct or indirect thermal contact of the channel material.
In some embodiments, the direct or indirect thermal contact in one end of the three-dimensional grapheme and the channel material.
In some embodiments, the contact position of the channel material Yu the electrode is arranged in the three-dimensional grapheme.
In some embodiments, the substrate is in U-shape structure, and the both ends of the longitudinal direction of the channel material are fixed respectively
On two sides of the U-shaped structure, the three-dimensional grapheme be arranged in the U-shaped structure bottom and the channel material
Between.
In some embodiments, the three-dimensional grapheme is adhered in the channel material.
In some embodiments, the both ends of each electrode extend in the longitudinal direction perpendicular to the channel material
It is connect to the outside of the channel material, and with the substrate.
In some embodiments, the three-dimensional grapheme is in rectangular parallelepiped structure, and the long side of the rectangular parallelepiped structure is parallel to
The longitudinal direction of the channel material.
In some embodiments, the substrate includes the first substrate and the second substrate of setting spaced apart, each
The first end of the longitudinal direction of the channel material of the probe unit is connect with first substrate, the channel material
The second end of longitudinal direction is stretched out from the side far from first substrate of second substrate, each probe unit
Two electrodes are separately positioned in first substrate and second substrate, and three-dimensional grapheme setting is described the
In two substrates, and thermally contacted with the second end of the channel material being pierced by from second substrate.
In some embodiments, the substrate includes the first substrate and is arranged with the first substrate separation certain distance
At least one second substrate, at least one described probe unit is arranged in a one-to-one correspondence at least one described second substrate,
In each probe unit the channel material be arranged in second substrate, two institutes of each probe unit
The first end for stating electrode is connect with first substrate, and is stretched from the side far from second substrate of first substrate
Out, the second end of two electrodes and both ends ohm of the longitudinal direction for the channel material being arranged in second substrate connect
Touching, the three-dimensional grapheme are arranged in second substrate.
It in some embodiments, further include thermal insulation layer, the thermal insulation layer is arranged in the channel material and institute
It states between three-dimensional grapheme.
In some embodiments, the first end of each electrode is provided with tapered pin structure.
In some embodiments, multiple probe units are in face battle array arrangement or linear array arrangement.
According to terahertz detector described in the above-mentioned various embodiments of the disclosure using directly or indirectly with channel material
Absorber of the three-dimensional grapheme of thermo-contact as THz wave solves channel material and asks THz wave incomplete absorption
Topic, to effectively improve the response sensitivity of detector.Further, since three-dimensional grapheme is for all band, big incidence angle
The achievable efficient absorption of THz wave of degree, random polarization state, so that the terahertz detector has bandwidth of operation
The advantages that width, angle are adaptable, to polarization indifference.
Detailed description of the invention
Fig. 1 is the structural schematic diagram according to a kind of terahertz detector of exemplary embodiment of the disclosure；
Fig. 2 is the structural schematic diagram according to the terahertz detector of another exemplary embodiment of the disclosure；
Fig. 3 is according to the structural schematic diagram of the terahertz detector of another exemplary embodiment of the disclosure, wherein too
Multiple probe units of hertz detector are linear array arrangement；
Fig. 4 is the structural schematic diagram of a probe unit of terahertz detector shown in Fig. 3；
Fig. 5 is according to the structural schematic diagram of the terahertz detector of another exemplary embodiment of the disclosure, wherein too
Multiple probe units of hertz detector are face battle array arrangement；And
Fig. 6 is the structural schematic diagram of a probe unit of terahertz detector shown in fig. 5.
Specific embodiment
Although being answered the disclosure is fully described referring to the attached drawing of the preferred embodiment containing the disclosure before being described herein
Disclosure described herein can be modified by understanding those skilled in the art, while obtain the technical effect of the disclosure.Cause
This, it should be understood that above description is an extensive announcement for those of ordinary skill in the art, and its content does not lie in limit
Exemplary embodiment described in the disclosure processed.
In addition, in the following detailed description, to elaborate many concrete details to provide to present disclosure convenient for explaining
The comprehensive understanding of embodiment.It should be apparent, however, that one or more embodiments without these specific details can also be with
It is carried out.In other cases, well known construction and device is diagrammatically embodied to simplify attached drawing.
According to the inventive concept generally of the disclosure, a kind of terahertz detector is provided, comprising: substrate and at least
One probe unit, each probe unit includes: channel material, and the channel material is arranged on the substrate, and two
A electrode, two electrodes respectively with the both ends Ohmic contact and three-dimensional grapheme of the longitudinal direction of the channel material, institute
State three-dimensional grapheme and the direct or indirect thermal contact of the channel material.
Fig. 1 is the structural schematic diagram according to a kind of terahertz detector of exemplary embodiment of the disclosure.As shown,
The terahertz detector includes substrate 2 and a probe unit, and wherein substrate 2 is suitable for providing surely for entire terahertz detector
Fixed mechanical support, for the single layer cuboid thin slice formed by suitable thermoelectric material, these materials include but is not limited to height
Hinder silicon, silicon nitride, silica, silicate glass etc..Probe unit includes 1, two electrode 3,4 of channel material and three-dimensional stone
Black alkene 5.Wherein channel material 1 is located in substrate 2, and the converting heat for will come from the conduction of three-dimensional grapheme 5 is for convenience of direct
The electric signal detected can be formed by the material of good thermoelectric property, these materials include but is not limited to graphene, carbon
Nanotube, transient metal chalcogenide compound etc..Two electrodes 3,4 are located at the both ends of the longitudinal direction of channel material 1, and with
Channel material 1 forms good Ohmic contact, so that the electric signal for generating channel material 1 sends electrical detection instrument to (not
Show) for measurement, electrode 3,4 can be used the metal material with good conductive characteristic and be made.Three-dimensional grapheme 5 and substrate 2
Connection, and it is located at the top of 1 contact position of an electrode 3 and channel material, and directly with electrode 3 and channel material 1
Thermo-contact.
In use, the terahertz detector is fixed on solid and reliable optical bracket first, make its front in face of to
Survey THz wave 6.When THz wave 6 to be measured is irradiated to the detector surface, three-dimensional grapheme 5 will absorb THz wave to be measured
6, and channel material 1 is transferred energy in the form of heat, one end temperature so as to cause channel material 1 close to electrode 3 increases.
The both ends formation temperature of channel material 1 is poor as a result, to cause photo-thermal electrical effect, generates thermoelectric between two electrodes 3,4
Kinetic potential can pass through the intensity of the size of the electrical detection device measuring thermoelectromotive force you can get it THz wave 6 to be measured.
Since three-dimensional grapheme 5 is made of staggered thin graphene intensive in three-dimensional space, there is certain machine
Tool intensity.Many pore structures to differ in size, the ruler of these holes are formed in three-dimensional grapheme 5, between thin graphene
It is very little to be in tens microns to micron dimensions up to a hundred, and this magnitude is just corresponding with the wavelength of THz wave.Therefore, it is incident on
Strong scattering and diffraction will occur for the THz wave on 5 surface of three-dimensional grapheme, and vibrate repeatedly in three-dimensional grapheme 5, from
And it is absorbed in large quantities by three-dimensional grapheme.According to statistics, three-dimensional grapheme 5 can generally achieve in the absorptivity of terahertz wave band
99% or more.The detector that the disclosure is proposed solves channel material 1 and treats by regarding three-dimensional grapheme 5 as absorber
The problem of surveying 6 incomplete absorption of THz wave, to effectively improve the response sensitivity of detector.
Further, since three-dimensional grapheme 5 for all band, big incident angle, random polarization state THz wave can be real
It is now efficient to absorb, as long as THz wave 6 is enable to be irradiated to device front, so that the terahertz detector has work
Make with wide, angle is adaptable, to polarization indifference the advantages that, this make its than by antenna collect THz wave 6 detection
Device has more wide application range and more excellent stability.
Terahertz detector provided by the embodiment is by by the longitudinal direction of three-dimensional grapheme 5 and channel material 1
The direct or indirect thermal contact in one end, to obtain asymmetrical assimilation effect, so that detector be allow to work in uniform terahertz
Hereby in the environment of field, make it easy to integrated and more practical.Moreover, the shape of three-dimensional grapheme 5, size and location can be neatly
Adjustment, this is that the shortcomings that detecting mechanism, the performance of improvement sensitive detection parts is overcome to provide convenience.
It should be noted that, although terahertz detector in the above-described embodiments is to realize spy by photo-thermal electrical effect
It surveys, however the technology of this field should be appreciated that in some other embodiment of the disclosure, can also use thermal effect of radiation
With pyroelectric effect etc..
Fig. 2 shows the terahertz detectors according to another exemplary embodiment of the disclosure.As shown in Fig. 2, this is too
Hertz detector includes substrate 2 and a probe unit.Wherein, unlike embodiment shown in FIG. 1, substrate 2 is in U-shape knot
Structure, the both ends of channel material 1 are separately fixed on two sides 22 of U-shaped structure, so that the middle section of channel material 1 is outstanding
Sky is not contacted with substrate 2.Three-dimensional grapheme 5 is arranged between the bottom 21 of U-shaped structure and channel material 1.
As shown in Fig. 2, in a kind of exemplary embodiment, the bottom 21 of the bottom of three-dimensional grapheme 5 and substrate is securely
Connection, the top of three-dimensional grapheme 5 is thermally contacted with channel material 1, such as can be bonded three-dimensional grapheme 5 by electric silica gel
Onto channel material 1.
As depicted in figs. 1 and 2, in some embodiments, the both ends of electrode 3,4 are in the longitudinal direction side perpendicular to channel material 1
The outside of channel material 1 is extended up to, and is connect with substrate 2, such as be pasted together.
As depicted in figs. 1 and 2, in some embodiments, three-dimensional grapheme 5 is in rectangular shape, and the long side of cuboid is flat
Row is in the longitudinal direction of channel material 1, to increase the contact area with channel material 1.It should be noted that the technology of this field
Personnel should be appreciated that in some other embodiment of the disclosure, three-dimensional grapheme 5 can also use other shapes, such as horizontal
Section is the shape etc. of isosceles trapezoid.
Fig. 3 and Fig. 4 shows the terahertz detector of another exemplary embodiment according to the disclosure.Such as Fig. 3 and Fig. 4
Shown, which includes substrate 2 and multiple probe units in linear array arrangement.Wherein, substrate 2 includes substantially parallel
And the first substrate 2-1 and the second substrate 2-2 of setting spaced apart.The channel material 1 of each probe unit is along longitudinal direction
The first end in direction is connect with the first substrate 2-1, and the second end along the longitudinal direction of the channel material 1 connects with the second substrate 2-2
It connects, and is stretched out from the side far from the first substrate 2-1 of the second substrate 2-2.An electrode 4 setting in two electrodes 3,4 exists
On first substrate 2-1, and good Ohmic contact is formed with the first end of channel material 1, another electrode 3 is arranged in the second base
On the 2-2 of bottom, and good Ohmic contact is formed with the second end of channel material 1.Three-dimensional grapheme 5 is arranged in the second substrate 2-2
On, and with the second end of channel material 1 formed it is good thermally contact, which can cover all channel material 1
Second end and electrode 3 a part.
Although multiple probe units in linear array arrangement are shown in this embodiment, it should be noted that ability
Domain it will be appreciated by the skilled person that in some other embodiment of the disclosure, can also only be arranged one as detect it is single
Member, or multiple this probe units in face battle array arrangement also can be set.
Fig. 5 and Fig. 6 shows the terahertz detector of another exemplary embodiment according to the disclosure.Such as Fig. 5 and Fig. 6
Shown, which includes substrate 2 and multiple probe units in face battle array arrangement.Wherein, substrate 2 includes the first substrate
The 2-1 and multiple second substrate 2-2 ' being arranged with the substantially parallel spaced-apart certain distance of first substrate.Multiple probe units with
Multiple second substrate 2-2 ' are arranged in a one-to-one correspondence, and the channel material 1 of each probe unit is arranged on the second substrate 2-2 ', often
The first end of two electrodes 3,4 of a probe unit is connect with the first substrate 2-1, and from the first substrate 2-1 far from second
The side of substrate 2-2 ' is stretched out, and the second end of the two electrodes 3,4 connect with the second substrate 2-2 ', and respectively be arranged the
The both ends of the longitudinal direction of channel material 1 on two substrate 2-2 ' form good Ohmic contact.The setting of three-dimensional grapheme 5 is the
On two substrate 2-2 ' and with the indirect thermal contact of channel material 1.The terahertz detector can realize spy by pyroelectric effect
It surveys.When THz wave 6 to be measured is irradiated to the detector surface, three-dimensional grapheme 5 will absorb THz wave 6, and with the shape of heat
Formula transfers energy to channel material 1, increases so as to cause the temperature of channel material 1, to cause pyroelectric effect, at two
Thermoelectromotive force is generated between electrode 3,4, it can you can get it by the size of the electrical detection device measuring thermoelectromotive force
The intensity of THz wave 6 to be measured.
As shown in fig. 6, it is additionally provided with the thermal insulation layer 7 being covered in channel material 1 on each second substrate 2-2 ',
Side of the thermal insulation layer 7 far from channel material 1 is arranged in three-dimensional grapheme 5, in this way, thermal insulation layer 7 and three-dimensional grapheme 5
There is good thermo-contact between channel material 1, so that being formed between three-dimensional grapheme 5 and channel material 1 indirect
Thermo-contact.It should be noted that it will be understood by those of skill in the art that in some other embodiment of the disclosure, it can also
To be not provided with thermal insulation layer 7, so that channel material 1 and the direct thermal contact of three-dimensional grapheme 5.
Although multiple probe units in face battle array arrangement are shown in this embodiment, it should be noted that ability
Domain it will be appreciated by the skilled person that in some other embodiment of the disclosure, can also only be arranged one as detect it is single
Member, or multiple this probe units in linear array arrangement also can be set.
As shown in fig. 6, each electrode 3,4 is from the first substrate 2-1 far from the second substrate 2- in a kind of exemplary embodiment
The first end that 2 ' side is stretched out is provided with tapered pin structure 31,34, in order to circuit connection.
In a kind of unshowned exemplary embodiment of the disclosure, which further includes being suitable for each spy
Conducting wire or chip that two electrodes 3,4 of unit are connect with the positive probe of electrical detection equipment and negative probe are surveyed, is read with passing through
The intensity of electrical quantities variation you can get it THz wave 6 to be measured in electrical detection equipment.According to specific detection principle, for
The electrical quantities of observation include but is not limited to voltage, electric current, resistance, capacitor etc..Here electrical detection equipment includes and not only wraps
Include digital sourcemeter, oscillograph and lock-in amplifier.It should be noted that when terahertz detector includes in linear array arrangement or face battle array
When multiple detector cells of arrangement, which further includes corresponding electronic signal processing module, to multiple detections
The electric signal of unit is handled.
The disclosure additionally provides a kind of manufacturing method of above-mentioned terahertz detector, comprising the following steps:
Step 1. prepares channel material 1, which for example can grow mono-layer graphite by chemical vapour deposition technique
It is dilute, then the single-layer graphene is transferred on filter paper, and be cut into sizeable fillet as channel material 1；
Step 2: the channel material 1 cut is transferred in substrate 2；
Step 3: drawing mask plate, two electrodes 3,4 are made at the both ends of channel material 1 by the method for mask evaporation；
Step 4: preparing three-dimensional grapheme 5, such as three-dimensional grapheme block can be prepared by hydration heat method, and utilize and swash
Optical cutting method is cut to sizeable shape；
Step 5: three-dimensional grapheme 5 can be for example fixed in channel material 1 with heating conduction good heat conductive silica gel.
After preparation is completed, the resistivity between two electrodes 3,4 can be measured, by digital sourcemeter to examine this too
Whether hertz detector is connected.
It will be understood to those skilled in the art that embodiment described above is all exemplary, and this field
Technical staff can make improvements, the rushing in terms of not recurring structure or principle of structure described in various embodiments
It can be freely combined in the case where prominent.
After the preferred embodiment that the disclosure is described in detail, those skilled in the art can be apparent from,
It does not depart from the protection scope of appended claims and spirit is lower can carry out various change and change, and the disclosure is also not only restricted to
The embodiment of examples cited embodiment in bright book.
Claims (12)
1. a kind of terahertz detector characterized by comprising
Substrate；And
At least one probe unit, each probe unit include:
Channel material, the channel material are arranged on the substrate,
Two electrodes, two electrodes respectively with the both ends Ohmic contact of the longitudinal direction of the channel material, and
Three-dimensional grapheme, the three-dimensional grapheme and the direct or indirect thermal contact of the channel material.
2. terahertz detector according to claim 1, wherein one end of the three-dimensional grapheme and the channel material
Direct or indirect thermal contact.
3. terahertz detector according to claim 2, wherein three-dimensional grapheme setting the channel material with
The contact position of the electrode.
4. terahertz detector according to claim 1, wherein the substrate is in U-shape structure, the channel material it is vertical
On two sides for being separately fixed at the U-shaped structure to the both ends in direction, the three-dimensional grapheme is arranged in the U-shaped structure
Bottom and the channel material between.
5. terahertz detector according to claim 1, wherein the three-dimensional grapheme is adhered to the channel material
On.
6. terahertz detector according to claim 1, wherein the both ends of each electrode are perpendicular to the channel
The outside of the channel material is extended on the longitudinal direction of material, and is connect with the substrate.
7. terahertz detector according to claim 1 to 6, wherein the three-dimensional grapheme is in cuboid knot
Structure, the long side of the rectangular parallelepiped structure are parallel to the longitudinal direction of the channel material.
8. terahertz detector according to claim 1, wherein the substrate includes the first of setting spaced apart
Substrate and the second substrate, the first end of the longitudinal direction of the channel material of each probe unit and first substrate
The second end of connection, the longitudinal direction of the channel material is stretched from the side far from first substrate of second substrate
Out, two electrodes of each probe unit are separately positioned in first substrate and second substrate, described
Three-dimensional grapheme is arranged in second substrate, and the second end heat being pierced by from second substrate with the channel material
Contact.
9. terahertz detector according to claim 1, wherein the substrate includes the first substrate and with described first
Substrate separation certain distance setting at least one second substrate, at least one described probe unit and it is described at least one second
Substrate is arranged in a one-to-one correspondence, wherein the channel material of each probe unit is arranged in second substrate, each
The first end of two electrodes of the probe unit is connect with first substrate, and from the separate institute of first substrate
The side for stating the second substrate is stretched out, and the second end of two electrodes is vertical with the channel material that is arranged in second substrate
To the both ends Ohmic contact in direction, the three-dimensional grapheme is arranged in second substrate.
10. terahertz detector according to claim 9, wherein further include thermal insulation layer, the thermal insulation layer is set
It sets between the channel material and the three-dimensional grapheme.
11. terahertz detector according to claim 9, wherein the first end of each electrode is provided with tapered
Pin structure.
12. the terahertz detector according to any one of claim 8-11, wherein multiple probe units are in face battle array
Arrangement or linear array arrangement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822243302.8U CN209232819U (en) | 2018-12-28 | 2018-12-28 | Terahertz detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822243302.8U CN209232819U (en) | 2018-12-28 | 2018-12-28 | Terahertz detector |
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| Publication Number | Publication Date |
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| CN209232819U true CN209232819U (en) | 2019-08-09 |
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| CN201822243302.8U Withdrawn - After Issue CN209232819U (en) | 2018-12-28 | 2018-12-28 | Terahertz detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494293A (en) * | 2018-12-28 | 2019-03-19 | 同方威视技术股份有限公司 | Terahertz detector and its manufacturing method |
-
2018
- 2018-12-28 CN CN201822243302.8U patent/CN209232819U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109494293A (en) * | 2018-12-28 | 2019-03-19 | 同方威视技术股份有限公司 | Terahertz detector and its manufacturing method |
| US12004426B2 (en) | 2018-12-28 | 2024-06-04 | Nuctech Company Limited | Terahertz detector and method of manufacturing terahertz detector |
| CN109494293B (en) * | 2018-12-28 | 2024-09-13 | 同方威视技术股份有限公司 | Terahertz detector and manufacturing method thereof |
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