CN109738063B - Sub-terahertz wave detector for enhancing heat absorption - Google Patents
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- CN109738063B CN109738063B CN201910021826.9A CN201910021826A CN109738063B CN 109738063 B CN109738063 B CN 109738063B CN 201910021826 A CN201910021826 A CN 201910021826A CN 109738063 B CN109738063 B CN 109738063B
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Abstract
The invention relates to a sub-terahertz wave detector for enhancing heat absorption, which comprises a substrate layer, wherein a graphene heat conduction layer is arranged above the substrate layer, an insulation layer is arranged above the graphene heat conduction layer, lead electrodes and a log periodic antenna are arranged above the insulation layer, and two arms of the log periodic antenna are respectively and electrically connected with the corresponding lead electrodes; a graphene conducting layer is arranged between the two arms of the log periodic antenna and electrically connected with the two arms of the log periodic antenna, a dielectric layer is arranged above the graphene conducting layer, and a splitting grid and a lead electrode electrically connected with the splitting grid are arranged on the dielectric layer; this absorption of reinforcing heat's inferior terahertz wave detector through setting up the graphite alkene heat conduction ability of heat conduction, can conduct the graphite alkene conducting layer with the electromagnetic wave heat shunt of absorption for the carrier of graphite alkene conducting layer is more active, has improved the migration efficiency of carrier greatly, thereby the better detection of carrying on the inferior terahertz wave.
Description
Technical Field
The invention belongs to the technical field of sub-terahertz wave detection, and particularly relates to a sub-terahertz wave detector for enhancing heat absorption.
Background
The terahertz wave is an electromagnetic wave having a frequency in the range of 0.1 to 10THz (1THz is 1012Hz), has a wavelength in the range of 3mm to 30 μm, and is located between the millimeter wave (submillimeter wave) and the infrared wave. The corresponding energy range of the terahertz photons is 0.414-41.4 meV, and the terahertz photons are matched with the low-frequency vibration and rotation energy ranges of molecules and materials. The characteristics and the application of the terahertz waves which determine the special positions of the terahertz waves in the electromagnetic spectrum and are obviously different from those of millimeter waves and infrared rays in the aspects of transmission, scattering, reflection, absorption, penetration and the like also provide a large free space for the characterization and the control of people on substances.
Terahertz waves have many unique properties such as broadband, perspective, safety and the like, and have important application prospects in the basic fields of physics, chemistry, biomedicine and the like, and in the aspects of anti-terrorism, nondestructive imaging, spectral analysis and radar communication: (1) the application of terahertz waves in biomedicine is very attractive. The compound has strong functions and effects in the aspects of diagnosis and treatment of skin cancer, terahertz wave tomography, analysis and detection of medicines and the like. Because the vibration and the rotation frequency of biomacromolecules are in the terahertz wave band, and the terahertz wave radiation technology can extract important information of DNA, the terahertz wave can play an important role in the aspects of plant, particularly grain seed selection, excellent strain selection and the like. (2) Terahertz wave radiation can penetrate smoke and can detect toxic or harmful molecules, so that the terahertz wave radiation can play an important role in environmental monitoring and protection. Terahertz waves have strong penetrating power to a plurality of non-metal and non-polar dielectric materials, including materials such as clothes, packages, ceramic products and even walls, and can realize non-contact detection of hidden explosives carried in the materials. Compared with other technologies, the terahertz real-time detection means has different characteristic absorption and dispersion in different explosive types in terahertz wave bands and has fingerprint spectrum. The terahertz technology is utilized to detect and identify the terahertz technology, and then the internal structure information of the substance is analyzed. (3) The terahertz wave has lower energy, only several milli-electron volts, does not cause ionization injury to human bodies and does not harm human health, so that explosives hidden in the packaging materials can be conveniently detected, and the safety of detection personnel and equipment is greatly guaranteed. Meanwhile, the terahertz wave has great potential in radar and communication, detection of possible faults of space shuttles, astronomy and other aspects.
The patent application with the application number of 201610894003.3 provides a sub-terahertz wave detector with adjustable room temperature and a preparation method thereof, the sub-terahertz wave detector with adjustable room temperature mainly comprises a substrate, a log periodic antenna and a lead electrode are integrated on the substrate, and two arms of the log periodic antenna are respectively connected with the corresponding lead electrodes; a graphene conducting channel with high mobility and adjustable carrier concentration is arranged between the two arms of the log periodic antenna, and the graphene conducting channel is interconnected with the two arms of the log periodic antenna to form good ohmic contact; an aluminum oxide gate dielectric layer is arranged on the graphene conductive channel; and integrating a split grid and a corresponding lead electrode on an alumina grid dielectric layer of the graphene conductive channel. In practical application, the sub terahertz wave detector still has defects, and the current path and the heat flow path are arranged together, so that the problem that the current carrier activity of graphene of the sub terahertz wave detector for enhancing heat absorption is limited due to the fact that the region of the graphene conducting channel for absorbing heat is easily limited is found.
Disclosure of Invention
Aiming at the problems, the invention aims to solve the problems that the current path and the heat flow path of the existing sub-terahertz wave detector are integrated together, so that the heat flow is limited and the carrier efficiency of a graphene electric channel is influenced.
Therefore, the invention provides a sub-terahertz wave detector for enhancing heat absorption, which comprises a substrate layer, wherein a graphene heat conduction layer is arranged above the substrate layer, an insulating layer is arranged above the graphene heat conduction layer, lead electrodes and a logarithmic period antenna are arranged above the insulating layer, and two arms of the logarithmic period antenna are respectively and electrically connected with the corresponding lead electrodes; the array antenna comprises a log periodic antenna and is characterized in that a graphene conducting layer is arranged between two arms of the log periodic antenna and electrically connected with the two arms of the log periodic antenna, a dielectric layer is arranged above the graphene conducting layer, and a split grid and a lead electrode electrically connected with the split grid are arranged on the dielectric layer.
The graphene heat conduction layers are arranged at intervals, and a thermocouple layer is arranged in the middle of the graphene conductive layer.
The graphene heat conduction layer is divided into a first graphene heat conduction layer and a second graphene heat conduction layer, the first graphene heat conduction layer and the second graphene heat conduction layer are provided with insulating materials, and the second graphene heat conduction layer is fused with the first graphene heat conduction layer at the lower part of the interval of the two arms of the log-periodic antenna.
The fusion cross section of the second graphene heat conduction layer and the first graphene heat conduction layer is wedge-shaped
The insulating layer is made of silica gel.
The thickness of the insulating layer is 50-100 nm.
The thickness of the graphene heat conduction layer is 15-30 mu m.
The invention has the beneficial effects that: the sub-terahertz wave detector for enhancing heat absorption provided by the invention solves the problems that the current path and the heat flow path of the existing sub-terahertz wave detector are integrated together, so that the heat flow is limited and the carrier efficiency of a graphene electric channel is influenced.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a first configuration of a sub-terahertz wave detector that enhances heat absorption.
FIG. 2 is a second schematic diagram of the structure of a sub-terahertz wave detector for enhancing heat absorption.
FIG. 3 is a third schematic diagram of the structure of a sub-terahertz wave detector for enhancing heat absorption.
In the figure: 1. a substrate layer; 2. a graphene heat conducting layer; 3. an insulating layer; 4. a lead electrode; 5. a log periodic antenna; 6. a graphene conductive layer; 7. a dielectric layer; 8. splitting the grid; 9. a first graphene thermal conductive layer; 10. a second graphene thermal conductive layer; 11. a thermocouple layer.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.
Example 1
The problem of current path and the hot circulation route integration of the inferior terahertz wave detector that aims at solving current reinforcing heat absorption lead to the thermal current to be restricted, influence graphite alkene electric channel's carrier efficiency is solved. The embodiment provides a sub-terahertz wave detector for enhancing heat absorption as shown in fig. 1, fig. 2 and fig. 3, which includes a substrate layer 1, a graphene heat conduction layer 2 is arranged above the substrate layer 1, an insulating layer 3 is arranged above the graphene heat conduction layer 2, a lead electrode 4 and a log periodic antenna 5 are arranged above the insulating layer 3, and two arms of the log periodic antenna 5 are electrically connected with the corresponding lead electrodes 4 respectively; a graphene conducting layer 6 is arranged between two arms of the log periodic antenna 5, the graphene conducting layer 6 is electrically connected with the two arms of the log periodic antenna 5, a dielectric layer 7 is arranged above the graphene conducting layer 6, and a splitting grid 8 and a lead electrode 4 electrically connected with the splitting grid 8 are arranged on the dielectric layer 7; by the design, a current path and a heat flow path can be separated, current is mainly concentrated on the graphene conducting layer 6, the heat flow path is concentrated on the graphene conducting layer 2, the graphene conducting layer 2 assists in conducting heat, more heat generated by the log-periodic antenna 5 can be conducted, more heat can be concentrated on the area where the graphene conducting layer 6 is located, current carriers of the graphene conducting layer 6 can be better excited, and the sub-terahertz wave detector has a better thermoelectric effect when being coupled in an optical field.
Further, as shown in fig. 2, the graphene heat conduction layers 2 are arranged at intervals, the thermocouple layer 11 is arranged in the middle of the graphene heat conduction layer 6, and the thermocouple layer 11 is arranged between two arms of the log periodic antenna 5, so that whether an electromagnetic field in a space is uniform can be further identified, specifically, the log periodic antenna 5 is excited by an electromagnetic field/an optical field, when the electromagnetic field/the optical field is different, the absorbed heat of the log periodic antenna 5 in different areas is different, the heat transferred by the graphene heat conduction layer 2 in the corresponding area is different, so that the temperatures in different areas in the graphene heat conduction layer 6 are different, a potential difference is generated at two ends of the thermocouple layer 11, thereby changing the electrical conductivity of the graphene heat conduction layer 6, and the sensitivity-enhanced sub-terahertz wave detector is arranged at different positions, a determination is made as to whether the intensity of the electromagnetic/optical field is uniform.
Further, as shown in fig. 3, the graphene heat conduction layer 2 is divided into a first graphene heat conduction layer 9 and a second graphene heat conduction layer 10, the first graphene heat conduction layer 9 and the second graphene heat conduction layer 10 are provided with an insulating material 11, and the second graphene heat conduction layer 10 is fused with the first graphene heat conduction layer 9 below the two arm intervals of the log periodic antenna 5, so that multi-layer heat absorption can be formed, and the fused cross section of the second graphene heat conduction layer 10 and the first graphene heat conduction layer 9 is wedge-shaped, so that resonance can be generated on electromagnetic waves of various channels, absorption of the electromagnetic waves is enhanced, more heat is generated, and a better enhancement effect is achieved on carriers exciting the graphene heat conduction layer 6.
Foretell insulating layer 3 is made for silica gel, and the primary function is cut apart graphite alkene conducting layer 6 and graphite alkene heat-conducting layer 2, avoids graphite alkene heat-conducting layer 2 to influence the electrically conductive characteristic of graphite alkene conducting layer 6.
The thickness of the insulating layer 3 is 50 to 100nm, preferably 50nm, 60nm, 70nm, or the like.
The thickness of the graphene heat conduction layer 2 is 15-30 μm, and preferably 20 μm or 25 μm.
In the scheme, the substrate layer 1 can be silicon dioxide, the thickness can be 1 mm-2 mm, and 1mm, 1.5mm, 2mm and the like can be selected preferentially; the lead electrode 4 is an external lead connection electrode composed of conductive metal, and can be composed of conductive metal such as copper, gold and the like; the dielectric layer 7 mainly functions in light transmission and insulation and can be made of aluminum oxide, silicon dioxide and the like; the splitting grid 6 mainly plays a role in regulation and control, regulates and controls the coupling of the log periodic antenna 5 with an optical field and an electromagnetic field, and regulates and controls the conduction efficiency of the graphene conducting layer 6.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (6)
1. A sub-terahertz wave probe for enhanced heat absorption, comprising a substrate layer (1), characterized in that: a graphene heat conduction layer (2) is arranged above the substrate layer (1), an insulating layer (3) is arranged above the graphene heat conduction layer (2), lead electrodes (4) and a log periodic antenna (5) are arranged above the insulating layer (3), and two arms of the log periodic antenna (5) are respectively and electrically connected with the corresponding lead electrodes (4); a graphene conducting layer (6) is arranged between two arms of the log periodic antenna (5), the graphene conducting layer (6) is electrically connected with the two arms of the log periodic antenna (5), a dielectric layer (7) is arranged above the graphene conducting layer (6), a splitting grid (8) and a lead electrode (4) electrically connected with the splitting grid (8) are arranged on the dielectric layer (7),
the graphene heat conduction layer (2) is arranged at intervals, and a thermocouple layer (11) is arranged in the middle of the graphene heat conduction layer (6).
2. A sub-terahertz wave probe for enhancing heat absorption as claimed in claim 1 wherein: graphene heat-conducting layer (2) divide into first graphite alkene heat-conducting layer (9), second graphite alkene heat-conducting layer (10), and first graphite alkene heat-conducting layer (9) are provided with insulating material with second graphite alkene heat-conducting layer (10) to second graphite alkene heat-conducting layer (10) in the below department of two arm intervals department of log periodic antenna (5) fuses with first graphite alkene heat-conducting layer (9).
3. A sub-terahertz wave probe for enhancing heat absorption as claimed in claim 2 wherein: the fusion cross section of the second graphene heat conduction layer (10) and the first graphene heat conduction layer (9) is wedge-shaped.
4. A sub-terahertz wave probe for enhancing heat absorption as claimed in claim 1 wherein: the insulating layer (3) is made of silica gel.
5. A sub-terahertz wave probe for enhancing heat absorption as claimed in claim 1 wherein: the thickness of the insulating layer (3) is 50-100 nm.
6. A sub-terahertz wave probe for enhancing heat absorption as claimed in claim 1 wherein: the thickness of the graphene heat conduction layer (2) is 15-30 mu m.
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| CN106374006B (en) * | 2016-10-13 | 2018-06-29 | 中国科学院上海技术物理研究所 | The sub- terahertz wave detector and preparation method of a kind of room-temperature-settable control |
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