WO2022091992A1 - Source de lumière térahertz, détecteur de fluide et procédé de génération d'ondes térahertz - Google Patents

Source de lumière térahertz, détecteur de fluide et procédé de génération d'ondes térahertz Download PDF

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Publication number
WO2022091992A1
WO2022091992A1 PCT/JP2021/039209 JP2021039209W WO2022091992A1 WO 2022091992 A1 WO2022091992 A1 WO 2022091992A1 JP 2021039209 W JP2021039209 W JP 2021039209W WO 2022091992 A1 WO2022091992 A1 WO 2022091992A1
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terahertz
lens
light source
optical element
layer
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PCT/JP2021/039209
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English (en)
Japanese (ja)
Inventor
誠 中嶋
ウサラ バリン カトリン ペンダン マグ
幹彦 西谷
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国立大学法人大阪大学
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Priority to JP2022559104A priority Critical patent/JPWO2022091992A1/ja
Publication of WO2022091992A1 publication Critical patent/WO2022091992A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S1/00—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
    • H01S1/02—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range solid

Definitions

  • the present invention relates to a terahertz light source that emits a terahertz wave based on a laser beam, a fluid detector, and a method for generating a terahertz wave.
  • Terahertz waves refer to electromagnetic waves with a frequency of around 1 THz (wavelength 300 ⁇ m).
  • a terahertz wave refers to an electromagnetic wave of 0.03 THz or more and 30 THz in the frequency domain, and refers to an electromagnetic wave of 10 ⁇ m or more and 10 mm or less in the wavelength domain.
  • Terahertz waves are applied to security technology for checking dangerous goods at airports, for example.
  • the terahertz wave is an element in 6G (6th Generation Mobile Communication System, 6th generation mobile communication system), Beyond 5G, which is the next generation wireless communication system of 5G (5th Generation Mobile Communication System, 5th generation mobile communication system). It is expected to be a major candidate for technology.
  • a terahertz light source having a terahertz radiation layer having a non-magnetic layer containing a non-magnetic metal and a ferromagnetic layer laminated on the non-magnetic layer and containing a ferromagnetic metal in order to emit a terahertz wave based on a laser beam.
  • Patent Document 1 This terahertz radiation layer is formed on a substrate layer containing one of glass, quartz, sapphire, polyethylene terephthalate (PET), silicon and the like. This substrate layer may be composed of metals, insulators, semiconductors and other materials.
  • One aspect of the present invention is to realize a terahertz light source, a fluid detector, and a terahertz wave generation method having a simple and compact configuration for performing optical processing on a terahertz wave.
  • the terahertz light source includes a non-planar optical element in which a non-plane is formed and a terahertz radiation layer that radiates a terahertz wave based on a laser beam.
  • the terahertz radiation layer has a non-magnetic layer containing a non-magnetic metal and a ferromagnetic layer laminated on the non-magnetic layer and containing a ferromagnetic metal, and the terahertz radiation layer is formed on the non-planar optical element. It is characterized by that.
  • the fluid detector according to one aspect of the present invention relates to a pipeline member for flowing a fluid inside and one aspect of the present invention arranged inside the pipeline member. It is characterized by including a terahertz light source and a terahertz wave detector provided on an inner wall of the pipeline member in order to detect a terahertz wave radiated from the terahertz radiation layer of the terahertz light source.
  • the terahertz wave generation method includes a non-magnetic layer containing a non-magnetic metal and a ferromagnetic layer laminated on the non-magnetic layer and containing a ferromagnetic metal.
  • the terahertz radiation layer formed in the non-planar optical element is irradiated with a laser beam for generating a terahertz wave, and the terahertz wave emitted from the terahertz radiation layer is detected based on the laser beam. It is characterized by including a detection step.
  • another terahertz wave generation method emits a terahertz wave based on a non-planar optical element and a laser beam formed on the non-planar optical element. It is characterized by including a step of providing a terahertz light source including a terahertz radiation layer and an irradiation step of irradiating the terahertz light source with the laser beam.
  • a terahertz light source a fluid detector, and a terahertz wave generation method having a simple and compact configuration for performing optical processing on a terahertz wave.
  • FIG. It is a front view of the terahertz light source which concerns on Embodiment 1.
  • FIG. It is a front view of the plano-convex lens provided in the terahertz light source. It is a perspective view of the terahertz radiation zone provided in the said terahertz light source. It is sectional drawing which shows the manufacturing method of the said terahertz light source. It is a figure for demonstrating the operation of the said terahertz light source. It is a figure for demonstrating the operation of the terahertz light source which concerns on a comparative example. It is a front view of the modification of the terahertz light source. It is a front view of the terahertz light source which concerns on Embodiment 2.
  • FIG. 1 It is a front view of the plano-concave lens provided in the terahertz light source. It is a figure for demonstrating the operation of the said terahertz light source. It is a figure for demonstrating the operation of the terahertz light source which concerns on a comparative example. It is a front view of the modification of the terahertz light source which concerns on Embodiment 2. FIG. It is a perspective view of the terahertz light source which concerns on Embodiment 3.
  • FIG. It is a perspective view for demonstrating the operation of the cylinder lens provided in the said terahertz light source. It is a perspective view for demonstrating the operation of the spherical lens which concerns on a comparative example.
  • FIG. 1 It is a figure for demonstrating the operation of the terahertz light source which concerns on a comparative example. It is a figure for demonstrating another operation of the terahertz light source which concerns on Embodiment 3.
  • FIG. It is a figure for demonstrating the operation of the terahertz light source which concerns on a comparative example.
  • FIG. It is a front view of another terahertz light source which concerns on Embodiment 4.
  • FIG. It is a front view of the terahertz light source which concerns on a comparative example.
  • FIG. 1 is a front view of the terahertz light source 1 according to the first embodiment.
  • FIG. 2 is a front view of the plano-convex lens 5 provided in the terahertz light source 1.
  • FIG. 3 is a perspective view of the terahertz radiating zone 2 provided in the terahertz light source 1.
  • the terahertz light source 1 includes a plano-convex lens 5 (non-planar optical element, lens) irradiated with laser light, and a terahertz radiation layer 2 that emits terahertz waves based on the laser light. To prepare for.
  • one of both side surfaces is a convex surface 6 (non-planar), and the other of both side surfaces is a flat surface 7.
  • the convex surface 6 is preferably a spherical surface having a positive focal length.
  • the plano-convex lens 5 is typically used for condensing laser light.
  • the plano-convex lens 5 can be made of a transparent material such as glass, quartz, or plastic. This laser beam may be, for example, visible light, and the plano-convex lens 5 may be a lens for visible light.
  • the terahertz radiation layer 2 is formed on the convex surface 6 of the plano-convex lens 5.
  • the terahertz radiation layer 2 has a non-magnetic layer 3 containing a non-magnetic metal and a ferromagnetic layer 4 laminated on the non-magnetic layer 3 and containing a ferromagnetic metal.
  • the terahertz radiation layer 2 may have a ferromagnetic layer 4 and a non-magnetic layer 3 laminated on the ferromagnetic layer 4.
  • the ferromagnetic metal contains at least one of, for example, Fe, Co, Ni, CoFeB, GdFe and the like.
  • the non-magnetic metal contains at least one of the metals having a large spin-orbit interaction such as Pt, Au, Ru, Cu, Ta, Pd, W, and Al.
  • the ferromagnetic layer 4 is made of Fe and the non-magnetic layer 3 is made of Pt.
  • each of the non-magnetic layer 3 and the ferromagnetic layer 4 is, for example, 5 nm, which is extremely thin.
  • the thickness of the non-magnetic layer 3 and the ferromagnetic layer 4 is preferably 2 nm or more and 5 nm or less from the viewpoint of the intensity of the emitted terahertz wave.
  • the thickness of the non-magnetic layer 3 and the ferromagnetic layer 4 may be 1 nm or more and 20 nm or less.
  • the spin orbital coupling deflects the electrons by the spin hole angle ⁇ , and the terahertz wave is radiated from the terahertz radiation layer 2 in the direction intersecting the interface between the non-magnetic layer 3 and the ferromagnetic layer 4.
  • FIG. 4 is a cross-sectional view showing a method of manufacturing the terahertz light source 1.
  • the terahertz light source 1 As a method for producing the terahertz light source 1, for example, as shown in FIG. 4, first, as shown in FIG. 4, Pt is first formed on the convex surface 6 of the plano-convex lens 5 placed on the glass substrate 23 and the surface of the glass substrate 23 by magnetron sputtering. Sputtering is performed to form the non-magnetic layer 3. Then, Fe is sputtered onto Pt to form the ferromagnetic layer 4.
  • the thicknesses of the non-magnetic layer 3 and the ferromagnetic layer 4 vary depending on the position on the convex surface 6 of the plano-convex lens 5. Therefore, control to reduce such spatial variation in thickness is important, and it is preferable to design and create a spatial filter (spatial mask) in consideration of the variation in thickness. Since the intensity of the terahertz wave changes depending on the thickness of the non-magnetic layer 3 and the ferromagnetic layer 4, the intensity of the terahertz wave can be increased in the plane of the terahertz light source 1 by controlling the thickness of the non-magnetic layer 3 and the ferromagnetic layer 4. It will be possible to adjust. By controlling the beam pattern of sputtering, it is possible to control the thickness of the non-magnetic layer 3 and the ferromagnetic layer 4.
  • a method for producing the terahertz light source As a method for producing the terahertz light source 1, another thin film production method such as MBE (Molecular Beam Epitaxy) may be used.
  • MBE Molecular Beam Epitaxy
  • FIG. 5 is a diagram for explaining the operation of the terahertz light source 1.
  • FIG. 6 is a diagram for explaining the operation of the terahertz light source according to the comparative example.
  • the laser beam is focused by the plano-convex lens 5 and incident on the terahertz radiation layer 2 formed on the convex surface 6 of the plano-convex lens 5.
  • the terahertz radiation layer 2 radiates a terahertz wave to the opposite side of the plano-convex lens 5 based on the laser beam incident from the plano-convex lens 5 side.
  • the terahertz wave emitted from the terahertz radiating zone 2 is focused on the focal point of the plano-convex lens 5. Due to the structure of the plano-convex lens 5, the phase of the laser beam incident on the plano-convex lens 5 is delayed, and the terahertz wave emitted from the terahertz radiation layer 2 is narrowed down.
  • the terahertz light source 1 incorporates the function of a focal lens that collects the generated terahertz wave.
  • the terahertz radiation layer 2 is arranged independently, in order to collect the generated terahertz wave, an optical element for focusing such as a convex lens is used. Will need to be provided separately. In the first place, the lens for terahertz waves has a large chromatic aberration and is not suitable for focusing.
  • the non-magnetic layer 3 is formed on the convex surface 6 of the plano-convex lens 5, and the ferromagnetic layer 4 is formed on the non-magnetic layer 3.
  • the ferromagnetic layer 4 may be formed on the convex surface 6 and the non-magnetic layer 3 may be formed on the ferromagnetic layer 4.
  • the terahertz radiation layer 2 of the terahertz light source 1 is configured to have a large diameter and the terahertz wave radiated from the large diameter terahertz radiation layer 2 has a radiation intensity distribution pattern according to the emission position, the radiation intensity of the terahertz wave is provided.
  • Distribution patterns can be used for computational applications such as optical computing.
  • FIG. 7 is a front view of the terahertz light source 1A according to the modified example.
  • the terahertz light source 1A includes a plano-convex lens 5 and a terahertz radiation layer 2 formed on a plane 7 of the plano-convex lens 5.
  • the terahertz radiation zone 2 may be formed on the plane 7 of the plano-convex lens 5.
  • the terahertz radiation layer 2 may be formed on one convex surface of the biconvex lens.
  • the femtosecond laser beam is emitted from the side of the plano-convex lens 5 opposite to the side on which the terahertz radiation layer 2 is formed. However, it may be irradiated from the side where the terahertz radiation layer 2 is formed.
  • FIG. 8 is a front view of the terahertz light source 1B according to the second embodiment.
  • FIG. 9 is a front view of the plano-concave lens 8 provided in the terahertz light source 1B.
  • FIG. 10 is a diagram for explaining the operation of the terahertz light source 1B.
  • FIG. 11 is a diagram for explaining the operation of the terahertz light source according to the comparative example.
  • the terahertz light source 1B includes a plano-concave lens 8 (non-planar optical element, lens) in which one of both side surfaces is concave surface 9 (non-planar surface) and the other side surface is flat surface 10, and the terahertz radiation zone 2 is concave surface 9. Formed on top.
  • the concave surface 9 is preferably a spherical surface having a negative focal length.
  • the plano-concave lens 8 is typically used to extend the laser beam or increase the focal length in the optical system.
  • the laser light passes through the plano-concave lens 8 and is expanded to enter the terahertz radiating zone 2 formed on the concave surface 9 of the plano-concave lens 8.
  • the terahertz radiation layer 2 radiates a terahertz wave on the opposite side of the plano-concave lens 8 based on the laser beam incident from the plano-concave lens 8.
  • the terahertz light source 1B incorporates the function of a beam expander that expands the generated terahertz wave.
  • the terahertz radiation layer 2 is arranged independently, in order to expand the generated terahertz wave, an expansion optical element such as a concave lens is separately provided. It will be necessary to provide it. In the first place, the lens for terahertz waves has a large chromatic aberration and is not suitable for focusing.
  • the non-magnetic layer 3 is formed on the concave surface 9 of the plano-concave lens 8 and the ferromagnetic layer 4 is formed on the non-magnetic layer 3.
  • the ferromagnetic layer 4 may be formed on the concave surface 9, and the non-magnetic layer 3 may be formed on the ferromagnetic layer 4.
  • FIG. 12 is a front view of the terahertz light source 1C according to the modified example of the second embodiment.
  • the terahertz light source 1C includes a plano-concave lens 8 and a terahertz radiation layer 2 formed on a flat surface 10 of the plano-concave lens 8.
  • the terahertz radiation layer 2 may be formed on the plane 10 of the plano-concave lens 8.
  • the terahertz radiation layer 2 may be formed on one concave surface of both concave lenses.
  • the femtosecond laser beam is emitted from the side of the plano-concave lens 8 opposite to the side on which the terahertz radiation layer 2 is formed.
  • a femtosecond laser beam may be irradiated from the side where the terahertz radiation layer 2 is formed.
  • FIG. 13 is a perspective view of the terahertz light source 1D according to the third embodiment.
  • FIG. 14 is a perspective view for explaining the operation of the cylinder lens 11 provided in the terahertz light source 1D.
  • FIG. 15 is a perspective view for explaining the operation of the spherical lens according to the comparative example.
  • FIG. 16 is a diagram for explaining the operation of the terahertz light source according to the comparative example.
  • the terahertz light source 1D includes a cylinder lens 11 (non-planar optical element, lens) in which one of both side surfaces is a half peripheral surface 12 (non-planar surface) and the other side of both side surfaces is a flat surface 13, and the terahertz radiation zone 2 is a flat surface 13. Formed on top. Since refraction occurs in the cylinder lens 11 only along one plane, as shown in FIG. 14, a circular beam spot passing through the cylinder lens 11 from the half peripheral surface 12 toward the plane 13 becomes closer to its focal point. It gradually becomes elliptical and linear.
  • one of the two side surfaces is a spherical surface and the other side of the both side surfaces is a flat surface, and the refraction is uniformly generated.
  • the circular beam spot passing through the spherical lens toward is maintained its circular shape even at the focal position of the spherical lens.
  • the terahertz light source 1D emits light from the terahertz radiation layer 2 based on the femtosecond laser beam emitted from the half peripheral surface 12 side of the cylinder lens 11.
  • the beam of the terahertz wave to be generated is automatically shaped and emitted to the outside of the cylinder lens 11. If a femtosecond laser beam having a circular beam spot is incident on the terahertz radiation layer 2, the beam spot of the terahertz wave emitted from the terahertz radiation layer 2 is shaped into an elliptical shape at the focal position of the cylinder lens 11. ..
  • the terahertz light source according to the comparative example since the terahertz radiation layer 2 is arranged independently, the terahertz wave of the generated circular beam spot is shaped into an elliptical beam spot and collected. In order to illuminate, it is necessary to separately provide a light collecting optical element such as a cylinder lens.
  • the terahertz radiation layer 2 may be formed on the half peripheral surface 12 of the cylinder lens 11. In this case, it is preferable to irradiate the femtosecond laser beam from the plane 13 side of the cylinder lens 11.
  • the cylinder lens 11 may have half peripheral surfaces 12 on both side surfaces.
  • FIG. 17 is a diagram for explaining other operations of the terahertz light source 1D according to the third embodiment.
  • FIG. 18 is a diagram for explaining the operation of the terahertz light source according to the comparative example.
  • a femtosecond laser beam having an elliptical beam spot is emitted from the half-peripheral surface 12 side toward the plane 13 side of the cylinder lens 11.
  • the beam spot of the terahertz wave radiated from the terahertz radiation layer 2 is automatically shaped into a circle at the focal position of the cylinder lens 11.
  • the terahertz light source according to the comparative example since the terahertz radiation layer 2 is arranged independently, the terahertz wave of the generated elliptical beam spot is shaped into a circular beam spot and collected. In order to illuminate, it is necessary to separately provide a light collecting optical element such as a cylinder lens.
  • FIG. 19 is a perspective view of the terahertz light source 1E according to the third embodiment.
  • the terahertz light source 1E includes a parabolic mirror 14 (non-planar optical element), and the terahertz radiation layer 2 is formed on the surface of the parabolic mirror 14.
  • the terahertz radiation layer 2 is formed on the surface of the parabolic mirror 14, the terahertz light source 1E has a built-in function of condensing the collimated light.
  • FIG. 20 is a front view of the terahertz light source 1F according to the fourth embodiment.
  • FIG. 21 is a front view of the terahertz light source according to the comparative example.
  • the terahertz light source 1F includes a parabolic mirror 14 and a parabolic mirror 22 arranged to face the parabolic mirror 14. Then, the terahertz radiation layer 2 is formed on the surface of the parabolic mirror 14.
  • the collimated terahertz wave is directed toward the parabolic mirror 22 along the Y-axis direction. Be radiated. Then, the terahertz wave incident on the parabolic mirror 22 is reflected so as to be focused at the focal position of the parabolic mirror 22 toward the ⁇ X axis direction.
  • the terahertz light source 1F includes a parabolic mirror 14 and a parabolic mirror 22 arranged to face the parabolic mirror 14, and the terahertz radiation layer 2 has a parabolic shape. Since it is formed on the surface of the mirror 14, it incorporates the function of a collimator.
  • the terahertz radiation layer 2 is arranged independently, it is necessary to separately provide parabolic mirrors 14, 22, and 23 in order to collimate the generated terahertz wave. Occurs.
  • the parabolic mirrors 14, 22, and 23 may be any of an ellipsoidal mirror, a hyperboloid mirror, a spherical mirror, and an aspherical mirror.
  • FIG. 22 is a perspective view of the fluid detector 19 according to the fifth embodiment.
  • FIG. 23 is a diagram showing an optical fiber cable 15 provided in the fluid detector 19.
  • FIG. 24 is an enlarged cross-sectional image of part A shown in FIG. 23.
  • FIG. 25 is a cross-sectional view of the fluid detector 19.
  • the fluid detector 19 includes a pipeline member 20 for flowing a fluid inside, and a terahertz light source 1G arranged inside the pipeline member 20.
  • the terahertz light source 1G has an optical fiber cable 15 (non-planar optical element) to which a femtosecond laser beam is irradiated.
  • the optical fiber cable 15 has a core 16 to which a femtosecond laser beam is incident, and a clad 17 formed so as to cover the outer peripheral surface of the core 16.
  • the terahertz radiation layer 2 is formed so as to cover the outer peripheral surface (non-planar surface) of the clad 17.
  • the clad 17 has a through groove 18 for incidenting the femtosecond laser beam incident on the core 16 onto the terahertz radiation layer 2.
  • a plurality of through grooves 18 arranged along the axial direction of the clad 17 are formed along the circumferential direction of the clad 17.
  • the through groove 18 can be formed by removing the clad 17 at a constant pitch along the axial direction.
  • the clad 17 can be made of, for example, acrylic. Further, the clad 17 may be formed of a substance in which the femtosecond laser beam incident on the core 16 is scattered at a constant frequency.
  • the fluid flowing inside the pipeline member 20 includes gas and liquid to be monitored or analyzed.
  • the femtosecond laser beam incident on the core 16 passes through the through groove 18 formed in the clad 17. Then, it is incident on the inner peripheral surface of the terahertz radial layer 2 that covers the outer peripheral surface of the clad 17.
  • the terahertz wave is radiated from the outer peripheral surface of the terahertz radiation layer 2 toward the inner wall of the pipeline member 20.
  • the terahertz wave detector 21 provided on the inner wall of the pipeline member 20 detects the terahertz wave radiated from the outer peripheral surface of the terahertz radiation layer 2. This makes it possible to monitor or analyze the fluid flowing inside the pipeline member 20.
  • the terahertz light source includes a non-planar optical element in which a non-plane is formed and a terahertz radiation layer that radiates a terahertz wave based on a laser beam.
  • the terahertz radiation layer has a non-magnetic layer containing a non-magnetic metal and a ferromagnetic layer laminated on the non-magnetic layer and containing a ferromagnetic metal, and the terahertz radiation layer is formed on the non-planar optical element. It is characterized by that.
  • the terahertz radiation layer having a non-magnetic layer containing a non-magnetic metal and a ferromagnetic layer laminated on the non-magnetic layer and containing a ferromagnetic metal is formed with a non-plane through which laser light passes. It is formed on a planar optical element. Therefore, when the non-planar optical element is irradiated with the laser beam, the terahertz radiation zone formed on the non-planar optical element emits a terahertz wave based on the laser beam.
  • the laser beam When the laser beam is irradiated from the side opposite to the terahertz radiating zone formed on the non-planar optical element, the laser beam is optically processed by the non-planar optical element and incident on the terahertz radiating zone. Next, the terahertz radiating zone emits a terahertz wave based on the incident laser beam. Further, when the laser beam is irradiated from the terahertz radiation layer side formed on the non-planar optical element, the terahertz radiation layer emits a terahertz wave based on the incident laser light.
  • the non-planar optical element on which the terahertz radiating zone is formed applies optical processing to the terahertz wave radiated from the terahertz radiating zone.
  • the terahertz wave optically processed by the non-planar optical element is emitted from the non-planar optical element on the opposite side of the terahertz radiation zone.
  • the laser beam passes through the non-planar optical element and then enters the terahertz radiation zone.
  • the terahertz wave radiated from the terahertz radiative zone is directly radiated to the outside of the terahertz light source without passing through the non-planar optical element. Therefore, it is not necessary for the terahertz wave to pass through the non-planar optical element for the terahertz wave having a large chromatic aberration.
  • the non-planar optical element includes a lens and the terahertz radiation layer is formed on one side surface of the lens.
  • the laser light incident on the terahertz radiating zone or the terahertz wave radiated from the terahertz radiating zone can be optically processed by a lens.
  • the terahertz radiating zone is formed on the side surface opposite to the side surface where the laser beam is incident on the lens.
  • the terahertz wave radiated from the terahertz radiative zone is directly radiated to the outside of the terahertz light source without passing through the lens. Therefore, it is not necessary for the terahertz wave to pass through the lens for the terahertz wave having a large chromatic aberration.
  • the terahertz light source according to one aspect of the present invention preferably includes a plano-convex lens in which one of both side surfaces of the lens is convex and the other side of the lens is flat.
  • the terahertz wave radiated from the terahertz radiation zone can be focused by the plano-convex lens.
  • the terahertz light source according to one aspect of the present invention preferably includes a plano-concave lens in which one of both side surfaces of the lens is concave and the other side of the lens is flat.
  • the terahertz wave radiated from the terahertz radiation zone can be expanded by the plano-concave lens.
  • the terahertz light source according to one aspect of the present invention preferably includes a cylinder lens in which one of both side surfaces of the lens is a half peripheral surface and the other side of the both side surfaces is a flat surface.
  • the terahertz wave emitted from the terahertz radiation zone can be shaped by the cylinder lens.
  • the terahertz light source preferably includes a biconvex lens in which both sides of the lens are convex, or a biconcave lens in which both sides of the lens are concave.
  • the terahertz wave radiated from the terahertz radiation zone can be focused or expanded by a biconvex lens or a biconcave lens.
  • the aspherical optical element includes a mirror, the terahertz radiation layer is formed on the surface of the mirror, and the mirror is a parabolic mirror, an elliptical mirror, or a twin. It is preferable to include at least one of a curved mirror, a spherical mirror, and an aspherical mirror.
  • the beam of the terahertz wave radiated from the terahertz radiative zone can be focused by a mirror and deformed by collimating or the like.
  • the non-planar optical element includes an optical fiber cable, and the optical fiber cable is formed so as to cover a core to which the laser beam is incident and an outer peripheral surface of the core.
  • the terahertz radiation layer is formed so as to cover the outer peripheral surface of the clad, and the clad has a through groove for incidenting a laser beam incident on the core into the terahertz radiation layer. Is preferable.
  • the fluid detector according to one aspect of the present invention relates to a pipeline member for flowing a fluid inside and one aspect of the present invention arranged inside the pipeline member. It is characterized by including a terahertz light source and a terahertz wave detector provided on an inner wall of the pipeline member in order to detect a terahertz wave radiated from the terahertz radiation layer of the terahertz light source.
  • the terahertz wave generation method includes a non-magnetic layer containing a non-magnetic metal and a ferromagnetic layer laminated on the non-magnetic layer and containing a ferromagnetic metal.
  • the terahertz radiation layer formed in the non-planar optical element is irradiated with a laser beam for generating a terahertz wave, and the terahertz wave emitted from the terahertz radiation layer is detected based on the laser beam. It is characterized by including a detection step.
  • another terahertz wave generation method emits a terahertz wave based on a non-planar optical element and a laser beam formed on the non-planar optical element. It is characterized by including a step of providing a terahertz light source including a terahertz radiation layer and an irradiation step of irradiating the terahertz light source with the laser beam.
  • the non-planar optical element includes a lens, and in the irradiation step, the laser beam is emitted from the side opposite to the side on which the terahertz radiation layer is formed. It is preferable to irradiate.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

L'invention concerne une configuration simple et compacte pour mettre en oeuvre un traitement optique sur une onde térahertz. Une source de lumière térahertz (1) est pourvue d'une lentille (5) formée avec une surface convexe (6) pour faire passer la lumière laser, ainsi que d'une couche rayonnante térahertz (2) pour rayonner une onde térahertz sur la base de la lumière laser. La couche rayonnante térahertz (2) comprend une couche non magnétique (3) et une couche ferromagnétique (4) empilée sur la couche non magnétique (3). La couche rayonnante térahertz (2) est formée sur la lentille (5).
PCT/JP2021/039209 2020-10-28 2021-10-25 Source de lumière térahertz, détecteur de fluide et procédé de génération d'ondes térahertz WO2022091992A1 (fr)

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JP2017084991A (ja) * 2015-10-29 2017-05-18 セイコーエプソン株式会社 テラヘルツ波発生装置、イメージング装置、カメラ、および計測装置
CN109411993A (zh) * 2018-12-28 2019-03-01 中国工程物理研究院电子工程研究所 一种基于交换偏置磁场的太赫兹波发生器
US20190227404A1 (en) * 2016-07-20 2019-07-25 National University Of Singapore Terahertz Radiation Emitters
CN110441929A (zh) * 2019-08-14 2019-11-12 上海大学 基于磁电子学阵列式可调谐太赫兹波发射器及其制作方法
CN110518439A (zh) * 2019-09-06 2019-11-29 电子科技大学 一种宽带手性太赫兹发射源及发射方法

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JP2011228572A (ja) * 2010-04-22 2011-11-10 Ibaraki Univ テラヘルツ電磁波発生装置
JP2017084991A (ja) * 2015-10-29 2017-05-18 セイコーエプソン株式会社 テラヘルツ波発生装置、イメージング装置、カメラ、および計測装置
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CN109411993A (zh) * 2018-12-28 2019-03-01 中国工程物理研究院电子工程研究所 一种基于交换偏置磁场的太赫兹波发生器
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