WO2015174463A1 - 検出デバイスおよびその製造方法 - Google Patents
検出デバイスおよびその製造方法 Download PDFInfo
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- WO2015174463A1 WO2015174463A1 PCT/JP2015/063802 JP2015063802W WO2015174463A1 WO 2015174463 A1 WO2015174463 A1 WO 2015174463A1 JP 2015063802 W JP2015063802 W JP 2015063802W WO 2015174463 A1 WO2015174463 A1 WO 2015174463A1
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- Prior art keywords
- terahertz wave
- transmission path
- detection device
- waveguide
- photoconductive substrate
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Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
- G01N21/3586—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2201/066—Modifiable path; multiple paths in one sample
Definitions
- the present invention relates to a detection device for acquiring information on an object by detecting the state of a terahertz wave that has passed through the object, and a method for manufacturing the same.
- a terahertz wave is an electromagnetic wave having a frequency of about 0.01 to 100 THz corresponding to a space between a light wave and a radio wave, and has an intermediate property between the light wave and the radio wave.
- a technique for acquiring information on an object by detecting the state of a terahertz wave transmitted through the object or a terahertz wave reflected by the object has been proposed (see, for example, Patent Documents 1 to 3).
- Patent Document 1 discloses a reflection type detection device that acquires information on an object by detecting the state of a terahertz wave reflected by the object.
- the detection device described in Patent Literature 1 includes a terahertz wave generation unit, a prism, and a terahertz wave detection unit.
- the terahertz wave generation unit generates a terahertz wave by irradiating InAs with femtosecond pulse laser light.
- the terahertz wave enters the prism through an optical path that includes two off-axis parabolic mirrors. An object is placed on the plane of the prism.
- the terahertz wave incident on the prism becomes a terahertz wave including information on the object when totally reflected on the plane below the object.
- a terahertz wave including information on the object is emitted from the prism, passes through an optical path including two off-axis parabolic mirrors, and reaches the terahertz wave detection unit.
- the terahertz wave detection unit detects a terahertz wave including information on the object.
- Patent Document 1 proposes to integrate a terahertz wave generating element and a terahertz wave detecting element with a prism.
- Patent Document 2 discloses a reflection type detection device that acquires information on an object by detecting the state of a terahertz wave reflected by the object, and a reflection type detection device used therefor.
- the detection apparatus described in Patent Literature 2 includes a light source, a detection device, and a photodetector.
- the detection device includes a prism, a terahertz wave generating element disposed on the incident surface of the prism, and a terahertz wave detecting element disposed on the exit surface of the prism.
- the light source irradiates the terahertz wave generating element of the detection device with femtosecond pulse laser light.
- a terahertz wave is generated in the terahertz wave generating element, and the terahertz wave propagates in the prism.
- An object is placed on the plane of the prism.
- the terahertz wave becomes a terahertz wave including information on the object when totally reflected on a plane below the object, and reaches the terahertz wave detecting element.
- the terahertz wave detecting element generates light including information on the object according to the input terahertz wave.
- the photodetector detects light including information on the object.
- Patent Document 3 discloses a transmission type detection device that acquires information on an object by detecting the state of a terahertz wave that has passed through the object.
- FIG. 1 is a perspective view of the detection device described in Patent Document 3.
- the detection device 10 described in Patent Document 3 includes two metal plates 12a and 12b, two polystyrene plates 14a and 14b, and two photoconductive antennas 16a and 16b.
- the two metal plates 12a and 12b are arranged to face each other at an interval of about 100 ⁇ m, and the two polystyrene plates 14a and 14b are arranged between the two metal plates 12a and 12b.
- a laminate composed of two metal plates 12a and 12b and two polystyrene plates 14a and 14b constitutes a parallel plate waveguide.
- a gap 18 for accommodating an object is formed between the two polystyrene plates 14a and 14b.
- the interval between the two polystyrene plates 14a and 14b is about 50 ⁇ m.
- the object accommodated in the gap 18 exists in the middle of the waveguide.
- the photoconductive antenna 16a is disposed at one end of the stacked body, and the photoconductive antenna 16b is disposed at the other end of the stacked body. When the photoconductive antenna 16a is irradiated with femtosecond pulsed laser light, a terahertz wave is generated.
- the terahertz wave propagates through the polystyrene plate 14a, the gap 18 (object), and the polystyrene plate 14b and reaches the photoconductive antenna 16b.
- the photoconductive antenna 16b detects the terahertz wave that has passed through the object (converts it into an electrical signal).
- the detection device 10 described in Patent Document 3 Since the terahertz wave is greatly attenuated and it is difficult to irradiate the polystyrene plate 14a with the terahertz wave itself, the detection device 10 described in Patent Document 3 generates terahertz waves by irradiating the photoconductive antenna 16a with laser light. I am letting. Further, since the terahertz wave is attenuated when the gap 18 is enlarged, the gap 18 is preferably as small as possible.
- the detection device 10 described in Patent Document 3 is small, it can detect the state of the terahertz wave transmitted through the object.
- An object of the present invention is a transmission-type detection device for acquiring information on an object by detecting a state of a terahertz wave that has passed through the object, and has a sufficient space for accommodating the object. It is to provide a detection device capable of realizing downsizing and high-sensitivity detection while securing the same, and a method for manufacturing the same.
- a detection device for acquiring information on the target object by detecting a state of a terahertz wave that has passed through the target object.
- a terahertz wave generating element, a terahertz wave detecting element disposed so as to face the terahertz wave generating element, and disposed on the terahertz wave generating element and projecting from the terahertz wave generating element toward the terahertz wave detecting element
- a first transmission path, a second transmission path disposed on the terahertz wave detection element and projecting from the terahertz wave detection element toward the terahertz wave generation element, the terahertz wave generation element, and the terahertz wave
- the first transmission line and the second transmission line are surrounded by the detection element so as to surround the first transmission line and the second transmission line.
- the second transmission path is disposed at the tip thereof so as to be opposed to and spaced from the emission surface, and has an incident surface on which a terahertz wave emitted from the emission surface is incident. And the space between the incident surface and the space between the first transmission path and the sealing portion and the space between the second transmission path and the sealing portion.
- a method for manufacturing a detection device is a method for manufacturing the detection device, wherein a plurality of methods are provided on a first surface of a first photoconductive substrate. Forming a pair of first electrode films; forming a plurality of pairs of second electrode films on a first surface of the second photoconductive substrate; and Forming a plurality of first transmission lines on the second surface; forming a plurality of second transmission lines on the second surface of the second photoconductive substrate; and A sealing sheet having a plurality of through-holes for accommodating a transmission line and the second transmission line is formed on the second surface of the first photoconductive substrate and the second surface of the second photoconductive substrate.
- the first photoconductive substrate, the sealing sheet, and the second photoconductive substrate are fixed to each other, and a laminate is manufactured. Degree and, by cutting the laminate between the through-hole, and a step of obtaining a plurality of detection devices, the.
- the sealing portion is provided so as to surround the first transmission path and the second transmission path between the terahertz wave generation element and the terahertz wave detection element, and the object is accommodated in the sealing section. Since a sufficient space is secured, the object can easily move between the first transmission path and the second transmission path even if the distance between the first transmission path and the second transmission path is reduced. Therefore, it is possible to provide a detection device that can realize downsizing and highly sensitive detection. By using the detection device according to the present invention, the state of the terahertz wave transmitted through the object can be detected with high sensitivity.
- FIG. 1 is a perspective view of a transmission type detection device described in Patent Document 3.
- FIG. 2A is a perspective view of the detection device according to Embodiment 1
- FIG. 2B is a perspective view of the detection device according to Embodiment 1 with the sealing portion omitted.
- FIG. 3 is a cross-sectional view of the detection device according to the first embodiment.
- FIG. 4 is a cross-sectional view of a modification of the detection device according to the first embodiment.
- FIG. 5 is a cross-sectional view of the detection device according to Embodiment 1 in which the distance between the exit surface and the entrance surface is variable.
- FIG. 6 is a schematic diagram illustrating a configuration of the detection device according to the first embodiment.
- FIG. 7A to 7F are cross-sectional views illustrating the method of manufacturing the detection device according to Embodiment 1.
- FIG. 8A is a perspective view of the detection device according to Embodiment 2
- FIG. 8B is a perspective view of the detection device according to Embodiment 2 with the sealing portion omitted.
- FIG. 9 is a perspective view of a modification of the detection device according to Embodiment 2 in which the sealing portion is omitted.
- FIG. 10A is a perspective view of the detection device according to Embodiment 3
- FIG. 10B is a perspective view of the detection device according to Embodiment 3 with the sealing portion omitted.
- FIG. 11 is a perspective view of a modification of the detection device according to Embodiment 3 in which the sealing portion is omitted.
- FIG. 2A is a perspective view of the detection device 100
- FIG. 2B is a perspective view of the detection device 100 from which the sealing portion 150 is omitted.
- FIG. 3 is a cross-sectional view of the detection device 100.
- the detection device 100 is a device (chip) for acquiring information on an object by detecting the state of a terahertz wave that has passed through the object.
- terahertz wave refers to an electromagnetic wave having a frequency in the range of 0.01 to 100 THz.
- the type of the object is not particularly limited, but the detection device 100 according to the present embodiment is particularly effective when the object is in a flowable state such as a liquid or powder.
- the detection device 100 includes a terahertz wave generating element 110, a terahertz wave detecting element 120, a first waveguide 130, a second waveguide 140, and a sealing portion 150.
- the terahertz wave generating element 110 generates a terahertz wave for transmitting an object.
- the terahertz wave generating element 110 is a photoconductive antenna having a photoconductive substrate 112 and a pair of electrode films 114a and 114b disposed on the photoconductive substrate 112 (for example, low-temperature grown GaAs).
- the type of the terahertz wave generating element 110 is not particularly limited as long as a desired terahertz wave can be generated.
- Another example of the terahertz wave generating element 110 includes a nonlinear optical crystal (for example, ZnTe).
- the terahertz wave detecting element 120 is disposed so as to face the terahertz wave generating element 110.
- the terahertz wave detecting element 120 detects the terahertz wave emitted from the terahertz wave generating element 110 and transmitted through the object.
- the terahertz wave detecting element 120 is a photoconductive antenna having a photoconductive substrate 122 and a pair of electrode films 124a and 124b disposed on the photoconductive substrate 122 (for example, low-temperature grown GaAs). .
- the type of the terahertz wave detecting element 120 is not particularly limited as long as the terahertz wave emitted from the terahertz wave generating element 110 can be detected.
- Another example of the terahertz wave detection element 120 includes a nonlinear optical crystal (for example, ZnTe).
- the first waveguide 130 is a transmission line disposed on the terahertz wave generating element 110 (the photoconductive substrate 112). More specifically, the first waveguide 130 corresponds to a portion where the terahertz wave is generated in the terahertz wave generating element 110 (in this embodiment, the back side of the gap between the pair of electrode films 114a and 114b). Is arranged.
- the first waveguide 130 protrudes from the terahertz wave generation element 110 (photoconductive substrate 112) toward the terahertz wave detection element 120, and has an emission surface 132 that emits the terahertz wave at the tip thereof.
- the first waveguide 130 transmits the terahertz wave generated by the terahertz wave generating element 110 toward the emission surface 132 and emits it from the emission surface 132.
- the second waveguide 140 is a transmission line disposed on the terahertz wave detecting element 120 (photoconductive substrate 122). More specifically, the second waveguide 140 is a position corresponding to a portion that detects the terahertz wave in the terahertz wave detecting element 120 (in this embodiment, the back side of the gap between the pair of electrode films 124a and 124b). Is arranged.
- the second waveguide 140 protrudes from the terahertz wave detecting element 120 (photoconductive substrate 122) toward the terahertz wave generating element 110, and the terahertz emitted from the emission surface 132 of the first waveguide 130 at the tip thereof. It has an incident surface 142 on which waves are incident.
- the exit surface 132 and the entrance surface 142 are spaced apart from each other.
- the detection device 100 irradiates an object existing between the emission surface 132 and the incident surface 142 with a terahertz wave, and detects the terahertz wave transmitted through the object.
- the second waveguide 140 receives a terahertz wave that has passed through the object and transmits the terahertz wave to the terahertz wave detection element 120.
- the type of the material of the first waveguide 130 and the second waveguide 140 is not particularly limited as long as absorption (loss) and dispersion with respect to terahertz waves are small.
- Examples of the material of the first waveguide 130 and the second waveguide 140 include resin (for example, polytetrafluoroethylene), ceramics, and silicon.
- the material of the first waveguide 130 and the material of the second waveguide 140 may be different. From the viewpoint of ease of processing, the first waveguide 130 and the second waveguide 140 are preferably made of resin.
- the shape of the first waveguide 130 and the second waveguide 140 is not particularly limited as long as the terahertz wave can be efficiently transmitted.
- the shapes of the first waveguide 130 and the second waveguide 140 are rectangular parallelepipeds.
- the length of the first waveguide 130 (height from the terahertz wave generating element 110) and the length of the second waveguide 140 (height from the terahertz wave detecting element 120) are not particularly limited, but are each 10 ⁇ m. The above is preferable. By setting the lengths of the first waveguide 130 and the second waveguide 140 to 10 ⁇ m or more, it is possible to delay the propagation of stray light and reduce the influence of multiple reflection. On the other hand, from the viewpoint of ease of handling of the detection device 100, the upper limit of the length of the first waveguide 130 and the second waveguide 140 is about several millimeters.
- the width of the first waveguide 130 and the second waveguide 140 (the length in the direction parallel to the exit surface 132 and the entrance surface 142) is not particularly limited, and may be appropriately selected according to the wavelength of the terahertz wave.
- the terahertz wave of an arbitrary wavelength can be enhanced and the S / N ratio can be improved.
- the distance between the exit surface 132 and the entrance surface 142 is not particularly limited. Considering the balance between the ease of movement of the object and the loss of the terahertz wave, the distance between the exit surface 132 and the entrance surface 142 is preferably in the range of 10 to 100 ⁇ m.
- the side surface of the first waveguide 130 (surface other than the exit surface 132) and the side surface of the second waveguide 140 (surface other than the entrance surface 142) are covered with metal films 134 and 144 for reflecting terahertz waves. It is preferable.
- the back surface of the terahertz wave generating element 110 (photoconductive substrate 112) and the side surface of the first waveguide 130 are covered with a metal film 134 for reflecting terahertz waves.
- the back surface of the terahertz wave detecting element 120 (photoconductive substrate 122) and the side surface of the second waveguide 140 are covered with a metal film 144 for reflecting terahertz waves.
- the metal film 134 does not exist at the interface between the terahertz wave generating element 110 (photoconductive substrate 112) and the first waveguide 130, and the terahertz wave detecting element 120 (photoconductive substrate 122) and the second waveguide are not present.
- the metal film 144 does not exist at the interface with the waveguide 140.
- the type of metal constituting the metal films 134 and 144 is not particularly limited as long as it can reflect terahertz waves. Examples of the metal constituting the metal films 134 and 144 include gold, silver, aluminum, and alloys thereof.
- the first waveguide 130 is formed integrally with a base 136 disposed on the back surface of the terahertz wave generating element 110 (photoconductive substrate 112). May be.
- the second waveguide 140 may be formed integrally with a base 146 disposed on the back surface of the terahertz wave detection element 120 (photoconductive substrate 122).
- the sealing unit 150 surrounds the first waveguide 130 and the second waveguide 140 between the terahertz wave generating element 110 (photoconductive substrate 112) and the terahertz wave detecting element 120 (photoconductive substrate 122). Is arranged. In addition, since the sealing portion 150 is disposed apart from the first waveguide 130 and the second waveguide 140, the terahertz is around the first waveguide 130 and the second waveguide 140. A space for accommodating an object surrounded by the wave generating element 110 (the photoconductive substrate 112), the terahertz wave detecting element 120 (the photoconductive substrate 122), and the sealing portion 150 is formed. In order to accommodate the object in this space, two through holes 116a and 116b are formed in the terahertz wave generating element 110 (photoconductive substrate 112).
- the object irradiated with the terahertz wave must exist in the space between the exit surface 132 and the entrance surface 142, but the space between the exit surface 132 and the entrance surface 142 is the first.
- the space around the first waveguide 130 and the second waveguide 140 (the space between the first waveguide 130 and the sealing portion 150 and the space between the second waveguide 140 and the sealing portion 150) Communicated with. Therefore, the object can freely move in these spaces.
- the material of the sealing part 150 is not particularly limited as long as it is not affected by the object.
- Examples of the material of the sealing unit 150 include resin, rubber, and metal.
- the sealing portion 150 is preferably made of an elastic body. By giving elasticity to the sealing portion 150, as shown in FIG. 5, it is possible to adjust the distance between the exit surface 132 and the entrance surface 142, and the first waveguide 130 and the second waveguide. The interval from 140 can be changed. It is also possible to promote the reaction by stirring the fluid stored in the detection device 100.
- the difference in the absorption of the terahertz wave by the object can be known by performing the measurement a plurality of times while changing the distance between the emission surface 132 and the incident surface 142.
- the sealing part 150 is configured by a plurality of members that can slide with each other, or the sealing part 150 has a bellows (accordion) structure. The same effect as the case where the sealing part 150 consists of an elastic body can be expected.
- FIG. 6 is a diagram illustrating a configuration of a detection apparatus 200 for acquiring information on an object using the detection device 100 according to the present embodiment.
- the detection apparatus 200 includes a laser light source 210, a beam splitter 220, mirrors 230, 240, 260, a time delay 250, a power supply 270, an ammeter 280, and the detection device 100.
- An object (sample) S is accommodated in the space inside the detection device 100.
- the laser light source 210 emits short pulse laser light (for example, femtosecond pulse laser light).
- the light beam of the pulsed laser light is split into two light beams (pump light and probe light) by the beam splitter 220.
- the pump light is reflected by the mirror 230 and reaches the terahertz wave generating element 110 of the detection device 100.
- the electrode films 114a and 114b of the terahertz wave generating element 110 are respectively connected to a power source 270, and a predetermined voltage is applied between the electrode films 114a and 114b. In this state, when pump light is applied to the gap between the electrode films 114a and 114b, a pulsed terahertz wave is generated.
- the terahertz wave propagates through the first waveguide 130 and is emitted from the emission surface 132.
- the terahertz wave passes through the object (sample) S between the emission surface 132 and the incident surface 142 and becomes a terahertz wave including information on the object S.
- the terahertz wave that has passed through the object S enters the second waveguide 140 at the incident surface 142, propagates through the second waveguide 140, and reaches the terahertz wave detection element 120.
- the probe light is reflected by the mirror 240, passes through the time delay unit 250, is reflected by the mirror 260, and reaches the terahertz wave detection element 120 of the detection device 100.
- the electrode films 124 a and 124 b of the terahertz wave detection element 120 are each connected to an ammeter 280.
- the electrode When the terahertz wave reaches the terahertz wave detecting element 120 when the probe light is applied to the gap between the electrode films 124a and 124b, the electrode has a time corresponding to the pulse time width of the probe light and the carrier lifetime in the photoconductive substrate 122. A current flows between the films 124a and 124b. The magnitude of this current corresponds to the magnitude of the electric field amplitude of the terahertz wave that has reached the terahertz wave detecting element 120. Further, by using the time delay unit 250, the timing at which the terahertz wave reaches the terahertz wave detection element 120 and the timing at which the probe light reaches the terahertz wave detection element 120 can be shifted.
- a pulsed terahertz wave waveform can be obtained.
- a spectrum of the terahertz wave transmitted through the object S can be obtained by performing a Fourier transform on the waveform of the terahertz wave.
- the spectrum of the terahertz wave is acquired in a state where the object S is accommodated in the space in the detection device 100 and in a state where the object S is not accommodated, and an absorption spectrum of the object S with respect to the terahertz wave is calculated Obtainable.
- the manufacturing method of the detection device 100 according to the present embodiment is not particularly limited.
- the detection device 100 can be manufactured by the procedure shown in FIG.
- a wafer-like photoconductive substrate 112 ' is prepared.
- a plurality of pairs of electrode films 114a and 114b are formed on one surface of the photoconductive substrate 112 '.
- the formation method of the electrode films 114a and 114b is not particularly limited.
- the electrode films 114a and 114b are formed by photolithography.
- a plurality of first waveguides 130 are formed on the other surface of the photoconductive substrate 112 '.
- the method for forming the first waveguide 130 is not particularly limited.
- the first waveguide 130 is made of resin and is formed by imprint molding. Thereafter, a metal film 134 is formed on the side surface of the first waveguide 130 as necessary.
- a plurality of combinations of the terahertz wave generating element 110 and the first waveguide 130 are formed on one photoconductive substrate 112 ′. Further, a plurality of combinations of the terahertz wave detecting element 120 and the second waveguide 140 are formed on one photoconductive substrate 122 ′ by the same procedure. Thereafter, through holes 116 a and 116 b are also formed in the vicinity of each of the terahertz wave generating elements 110 in the photoconductive substrate 112 ′ in which a plurality of combinations of the terahertz wave generating elements 110 and the first waveguides 130 are formed.
- the photoconductive substrate 122 ′ (or the plurality of terahertz wave generating elements 110 and the plurality of first waveguides) on which the plurality of terahertz wave detecting elements 120 and the plurality of second waveguides 140 are formed.
- a sealing sheet 150 ′ having a plurality of through holes is placed on and fixed (adhered) to the photoconductive substrate 112 ′) on which the waveguide 130 is formed.
- a photoconductive substrate 112 ′ (or a plurality of terahertz wave detecting elements) in which a plurality of terahertz wave generating elements 110 and a plurality of first waveguides 130 are formed on a sealing sheet 150 ′.
- a laminated body including a plurality of terahertz wave generating elements 110, a plurality of terahertz wave detecting elements 120, a plurality of first waveguides 130, and a plurality of second waveguides 140 is obtained.
- the first waveguide 130 and the second waveguide 140 are accommodated in the through holes of the sealing sheet 150 ′.
- a plurality of detection devices can be obtained by cutting the laminate so as to pass between the through holes of the sealing sheet 150 ′.
- the detection device 100 has a large space communicating with the space between the exit surface 132 and the entrance surface 142 around the first waveguide 130 and the second waveguide 140. Have For this reason, an object can be easily installed in the space between the emission surface 132 and the incident surface 142 without increasing the size of the detection device 100. It is also easy to react an object with another substance in the detection device 100.
- the terahertz wave generation element 110 and the terahertz wave detection element 120 are photoconductive antennas
- the types of the terahertz wave generation element 110 and the terahertz wave detection element 120 are not limited to photoconductive antennas.
- the terahertz wave generating element 110 and the terahertz wave detecting element 120 are other elements, the means for generating the terahertz wave and the means for detecting the terahertz wave can be appropriately changed.
- the number of through holes for accommodating an object and The position is not particularly limited.
- the number of through holes for accommodating the object may be one or plural.
- the position of the through hole for accommodating the object is surrounded by the terahertz wave generating element 110 (photoconductive substrate 112), the terahertz wave detecting element 120 (photoconductive substrate 122), and the sealing portion 150.
- the through hole may be formed in the terahertz wave detection element 120 (photoconductive substrate 122) or the sealing portion 150.
- the detection device according to the second embodiment differs from the detection device according to the first embodiment in that the terahertz wave generation element and the terahertz wave detection element each have a plurality of pairs of electrode films. Therefore, the same components as those of the detection device 100 according to Embodiment 1 are denoted by the same reference numerals, and the description thereof is omitted.
- FIG. 8A is a perspective view of the detection device 300 according to Embodiment 2 of the present invention
- FIG. 8B is a perspective view of the detection device 300 from which the sealing portion 150 is omitted.
- the detection device 300 includes a terahertz wave generating element 310, a terahertz wave detecting element 320, three first waveguides 330, three second waveguides 340, and a sealing unit 150.
- the terahertz wave generating element 310 is a photoconductive antenna having a photoconductive substrate 112 and three pairs of electrode films 114 a and 114 b disposed on the photoconductive substrate 112.
- the terahertz wave detecting element 320 is a photoconductive antenna having a photoconductive substrate 122 and three pairs of electrode films 124 a and 124 b disposed on the photoconductive substrate 122.
- Each of the three first waveguides 330 is disposed on the back side of the gap between the three pairs of electrode films 114a and 114b in the terahertz wave generating element 310.
- the three second waveguides 340 are respectively disposed behind the gaps of the three pairs of electrode films 124 a and 124 b in the terahertz wave detection element 320.
- the exit surface 132 of one first waveguide 330 faces the entrance surface 142 of one second waveguide 340 while being spaced apart. That is, in the detection device 300 of the present embodiment, the combination of the pair of electrode films 114a and 114b, the one first waveguide 330, the one second waveguide 340, and the pair of electrode films 124a and 124b. Three sets are formed.
- the length of the first waveguide 330 (height from the terahertz wave generating element 310) and the length of the second waveguide 340 (height from the terahertz wave detecting element 320) are the same as those of the first waveguide 330 and Different for each combination of the second waveguides 340. Therefore, the distance between the exit surface 132 and the entrance surface 142 is also different for each combination of the first waveguide 330 and the second waveguide 340.
- the lengths of the first waveguide 330 and the second waveguide 340 shown on the left side are short (the distance between the exit surface 132 and the entrance surface 142 is large) and shown on the right side.
- the first waveguide 330 and the second waveguide 340 are long (the distance between the exit surface 132 and the entrance surface 142 is small). Note that the widths of all the first waveguides 330 and the second waveguides 340 are the same.
- the detection device 300 changes the position where the pump light and the probe light are irradiated, and the exit surface 132 and the entrance surface of the same object It is possible to perform measurement by changing the interval with 142.
- the example in which the three first waveguides 330 are formed separately and the three second waveguides 340 are formed separately has been described.
- the three first waveguides 330 may be integrally formed, and the three second waveguides 340 may be integrally formed.
- the detection device according to the third embodiment is different from the detection device according to the second embodiment in that the width of the plurality of first waveguides and the width of the plurality of second waveguides are different. Therefore, the same components as those of the detection device 100 according to the first embodiment or the detection device 300 according to the second embodiment are denoted by the same reference numerals and description thereof is omitted.
- FIG. 10A is a perspective view of the detection device 400 according to Embodiment 3 of the present invention
- FIG. 10B is a perspective view of the detection device 400 from which the sealing portion 150 is omitted.
- the detection device 400 includes a terahertz wave generation element 310, a terahertz wave detection element 320, three first waveguides 430, three second waveguides 440, and a sealing unit 150.
- the three first waveguides 430 and the three second waveguides 440 are each integrally formed.
- the width of the first waveguide 430 and the width of the second waveguide 440 are different for each combination of the first waveguide 430 and the second waveguide 440.
- the widths of the first waveguide 430 and the second waveguide 440 illustrated on the left side are small, and the first waveguide 430 and the second waveguide 440 illustrated on the right side are small.
- the width is large. Note that the intervals between all the first waveguides 430 and the second waveguides 440 are the same.
- the detection device 400 according to the third embodiment only changes the position where the pump light and the probe light are irradiated, and the wavelength of the terahertz wave that irradiates the same object. It is possible to measure by changing.
- the widths of the three first waveguides 430 formed integrally and the three second waveguides 440 formed integrally change discontinuously.
- the widths of the three first waveguides 430 formed integrally and the three second waveguides 440 formed integrally may be continuously changed. .
- three pairs of electrode films 114 a and 114 b are arranged for the three first waveguides 330 and 430, and the three second waveguides 340 and 440 are arranged.
- an example in which three pairs of electrode films 124a and 124b are arranged has been described.
- a pair of slidable electrode films may be arranged instead of arranging the same number of pairs of electrode films for the plurality of first waveguides 330 and 430 or the second waveguides 340 and 440.
- the transmission path (first transmission path) disposed on the back side of the terahertz wave generation element 110 and the transmission path (second transmission path) disposed on the back side of the terahertz wave detection element 120 are waveguides.
- the types of the first transmission path and the second transmission path are not limited thereto.
- the first transmission path and the second transmission path may be waveguides or transmission lines.
- the detection device according to the present invention is useful for food inspection, for example.
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Abstract
Description
(検出デバイスの構成)
図2および図3は、本発明の実施の形態1に係る検出デバイス100を示す図である。図2Aは、検出デバイス100の斜視図であり、図2Bは、封止部150を省略した検出デバイス100の斜視図である。図3は、検出デバイス100の断面図である。
次に、検出デバイス100の使用方法について説明する。
本実施の形態に係る検出デバイス100の製造方法は、特に限定されない。たとえば、検出デバイス100は、図7に示される手順により製造されうる。
以上のように、本実施の形態に係る検出デバイス100は、第1の導波路130および第2の導波路140の周囲に、出射面132と入射面142との間の空間と連通する大きな空間を有する。このため、検出デバイス100を大型化することなく、出射面132と入射面142との間の空間に対象物を容易に設置することができる。また、検出デバイス100内において対象物を別の物質と反応させることも容易である。
実施の形態2に係る検出デバイスは、テラヘルツ波発生素子およびテラヘルツ波検出素子が、それぞれ複数対の電極膜を有する点などにおいて、実施の形態1に係る検出デバイスと異なる。そこで、実施の形態1に係る検出デバイス100と同一の構成要素については、同一の符号を付してその説明を省略する。
実施の形態3に係る検出デバイスは、複数の第1の導波路の幅および複数の第2の導波路の幅が、それぞれ異なる点などにおいて、実施の形態2に係る検出デバイスと異なる。そこで、実施の形態1に係る検出デバイス100または実施の形態2に係る検出デバイス300と同一の構成要素については、同一の符号を付してその説明を省略する。
12a,12b 金属板
14a,14b ポリスチレン板
16a,16b 光伝導アンテナ
18 空隙
100,300,400 検出デバイス
110,310 テラヘルツ波発生素子
112,112’ 光伝導基板
114a,114b 電極膜
116a,116b 貫通孔
120,320 テラヘルツ波検出素子
122,122’ 光伝導基板
124a,124b 電極膜
130,330,430 第1の導波路
132 出射面
134,144 金属膜
136,146 基台
140,340,440 第2の導波路
142 入射面
150 封止部
150’ 封止シート
200 検出装置
210 レーザー光源
220 ビームスプリッター
230,240,260 ミラー
250 時間遅延器
270 電源
280 電流計
S 対象物(サンプル)
Claims (12)
- 対象物を透過したテラヘルツ波の状態を検出することで前記対象物の情報を取得するための検出デバイスであって、
テラヘルツ波発生素子と、
前記テラヘルツ波発生素子と対向するように配置されたテラヘルツ波検出素子と、
前記テラヘルツ波発生素子上に配置され、前記テラヘルツ波発生素子から前記テラヘルツ波検出素子に向かって突出する第1の伝送路と、
前記テラヘルツ波検出素子上に配置され、前記テラヘルツ波検出素子から前記テラヘルツ波発生素子に向かって突出する第2の伝送路と、
前記テラヘルツ波発生素子と前記テラヘルツ波検出素子との間に、前記第1の伝送路および前記第2の伝送路を取り囲むように、前記第1の伝送路および前記第2の伝送路と離間して配置された封止部と、
を有し、
前記第1の伝送路は、その先端に、前記テラヘルツ波発生素子で発生したテラヘルツ波を出射する出射面を有しており、
前記第2の伝送路は、その先端に、前記出射面と離間して対向するように配置され、前記出射面から出射されたテラヘルツ波を入射する入射面を有しており、
前記出射面と前記入射面との間の空間は、前記第1の伝送路と前記封止部との間の空間および前記第2の伝送路と前記封止部との間の空間と連通している、
検出デバイス。 - 前記テラヘルツ波発生素子、前記テラヘルツ波検出素子または前記封止部には、前記テラヘルツ波発生素子、前記テラヘルツ波検出素子および前記封止部により囲まれた空間と連通している貫通孔が設けられている、請求項1に記載の検出デバイス。
- 前記テラヘルツ波発生素子および前記テラヘルツ波検出素子は、光伝導基板と、前記光伝導基板上に配置された少なくとも1対の電極膜とを有する光伝導アンテナである、請求項1または請求項2に記載の検出デバイス。
- 前記光伝導アンテナは、複数対の電極膜を有する、請求項3に記載の検出デバイス。
- 前記第1の伝送路の前記出射面に平行な断面において、前記第1の伝送路の幅は、不連続に変化しており、
前記第2の伝送路の前記入射面に平行な断面において、前記第2の伝送路の幅は、不連続に変化している、
請求項4に記載の検出デバイス。 - 前記第1の伝送路の前記出射面に平行な断面において、前記第1の伝送路の幅は、連続的に変化しており、
前記第2の伝送路の前記入射面に平行な断面において、前記第2の伝送路の幅は、連続的に変化している、
請求項4に記載の検出デバイス。 - 前記封止部は、弾性体からなる、請求項1~6のいずれか一項に記載の検出デバイス。
- 前記出射面と前記入射面との間隔は、10~100μmの範囲内である、請求項1~7のいずれか一項に記載の検出デバイス。
- 前記第1の伝送路および前記第2の伝送路の長さは、それぞれ10μm以上である、請求項1~8のいずれか一項に記載の検出デバイス。
- 前記第1の伝送路および前記第2の伝送路は、それぞれ導波路、導波管または伝送線路である、請求項1~9のいずれか一項に記載の検出デバイス。
- 請求項1~10のいずれか一項に記載の検出デバイスの製造方法であって、
第1の光伝導基板の第1の面上に、複数対の第1の電極膜を形成する工程と、
第2の光伝導基板の第1の面上に、複数対の第2の電極膜を複数形成する工程と、
前記第1の光伝導基板の第2の面上に、第1の伝送路を複数形成する工程と、
前記第2の光伝導基板の第2の面上に、第2の伝送路を複数形成する工程と、
前記第1の伝送路および前記第2の伝送路を収容するための貫通孔を複数有する封止シートを、前記第1の光伝導基板の前記第2の面と前記第2の光伝導基板の前記第2の面との間に配置し、前記第1の光伝導基板、前記封止シートおよび前記第2の光伝導基板を固定して、積層体を作製する工程と、
前記貫通孔の間で前記積層体を切断して、複数の検出デバイスを得る工程と、
を含む、検出デバイスの製造方法。 - 前記第1の伝送路および前記第2の伝送路は、インプリント成形により形成される、請求項11に記載の検出デバイスの製造方法。
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