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CN-122029444-A - Diamond sensor

CN122029444ACN 122029444 ACN122029444 ACN 122029444ACN-122029444-A

Abstract

The diamond sensor includes diamond having a color center with electron spin, a transmission circuit for transmitting electromagnetic waves, an irradiation unit for irradiating the electromagnetic waves to the diamond, at least one of an impedance transformer and a resonator, and a protection circuit for protecting an electromagnetic wave source for supplying the electromagnetic waves, the protection circuit functioning as a capacitor for the electromagnetic waves and functioning as an inductor at a frequency lower than the frequency of the electromagnetic waves, and in the case of including the impedance transformer and the resonator, the protection circuit is arranged between the impedance transformer and the resonator, between the transmission circuit and a transmission cable connecting the transmission circuit and the electromagnetic wave source, or between the transmission cable and the electromagnetic wave source.

Inventors

  • SUMIYA HITOSHI
  • Shi Kuohe
  • XIAO LINFENG
  • Outlet ocean becomes
  • LIN SI
  • TATSUMI NATSUO
  • Kudo Koya

Assignees

  • 住友电气工业株式会社
  • 日新电机株式会社

Dates

Publication Date
20260512
Application Date
20240910
Priority Date
20231017

Claims (13)

  1. 1. A diamond sensor, wherein, The diamond sensor includes: Diamond having a color center with electron spin; a transmission circuit that transmits electromagnetic waves; An irradiation unit that irradiates the electromagnetic wave transmitted by the transmission circuit to the diamond; at least one of the impedance transformer and the resonator, and A protection circuit for protecting an electromagnetic wave source supplying the electromagnetic wave to the transmission circuit, In the case of including the impedance converter, the impedance converter is included in the transmission circuit, and reduces or increases the impedance of the electromagnetic wave source with respect to the irradiation section, In the case of including the resonator, the resonator is included in the irradiation section, The protection circuit functions as a capacitor for the electromagnetic wave, The protection circuit functions as an inductor at a frequency lower than the frequency of the electromagnetic wave, In the case where the impedance transformer is included without the resonator, the protection circuit is disposed between the impedance transformer and the irradiation section, between the transmission circuit and a transmission cable connecting the transmission circuit and the electromagnetic wave source, or between the transmission cable and the electromagnetic wave source, In the case where the impedance converter is not included but the resonator is included, the protection circuit is disposed between the transmission circuit and the resonator, between the transmission circuit and a transmission cable connecting the transmission circuit and the electromagnetic wave source, or between the transmission cable and the electromagnetic wave source, In the case of including the impedance transformer and the resonator, the protection circuit is disposed between the impedance transformer and the resonator, between the transmission circuit and a transmission cable connecting the transmission circuit and the electromagnetic wave source, or between the transmission cable and the electromagnetic wave source.
  2. 2. The diamond sensor of claim 1 wherein, The protection circuit includes a short-circuited stub connected in parallel with a transmission path for transmitting the electromagnetic wave to the irradiation section, The transmission path includes at least the transmission circuit.
  3. 3. The diamond sensor of claim 2, wherein the shorting stub is a λ/4 shorting stub.
  4. 4. A diamond sensor according to claim 2 or 3, wherein, The shorting stub includes a first conductive portion and a second conductive portion, The first conductive part and the second conductive part are respectively linear, The first conductive portions and the second conductive portions are arranged in parallel.
  5. 5. The diamond sensor of claim 4, wherein the first and second conductive portions each have a diameter of less than 1mm.
  6. 6. A diamond sensor according to any one of claims 1 to 5, wherein the characteristic impedance of the protection circuit is 200Ω.
  7. 7. The diamond sensor as set forth in claim 4 or 5, wherein, The short stub further includes a third conductive portion connecting corresponding ends of the first conductive portion and the second conductive portion to each other, The electrical length of the wavelength of the electromagnetic wave is lambda, and the length of the third conductive part is lambda/10 or less.
  8. 8. The diamond sensor as set forth in any one of claims 2 to 5, wherein, The transmission cable is a coaxial cable, The shorting stub connects the exposed signal line of the coaxial cable to the ground of the coaxial cable.
  9. 9. The diamond sensor of claim 8 wherein, The electrical length of the wavelength of the electromagnetic wave is lambda, and the exposed length of the signal line of the coaxial cable is lambda/10 or less.
  10. 10. The diamond sensor according to any one of claims 1 to 9, wherein, The diamond sensor comprises the resonator, The resonator includes a lambda/4 open stub.
  11. 11. The diamond sensor according to any one of claims 1 to 10, wherein, The diamond sensor comprises the resonator, The resonator comprises two flat plate-like conductive members, The two flat plate-like conductive members are arranged in parallel opposite to each other.
  12. 12. The diamond sensor according to any one of claims 1 to 10, wherein, The diamond sensor comprises the resonator, The resonator comprises two linear conductive members, The two linear conductive members are arranged parallel to each other.
  13. 13. The diamond sensor according to any one of claims 1 to 12, wherein, The diamond sensor comprises the impedance transformer, The impedance transformer includes a transformer.

Description

Diamond sensor Technical Field The present disclosure relates to diamond sensors. The present application claims priority based on japanese application No. 2023-178583 filed on 10/17 of 2023. All the descriptions in this application are incorporated by reference into the present specification. Background A diamond sensor using a diamond NV center (hereinafter referred to as NV center) is known. When the NV centre containing nitrogen (i.e. N) and vacancies adjacent to the nitrogen (i.e. V: vancy) at the substitution site of carbon (i.e. C) into the diamond is negatively charged, its ground state becomes a triplet state (i.e. spin s=1). The negatively charged NV center is referred to as NV - center, but will be hereinafter also referred to simply as NV center for convenience. In use as a sensor, a diamond containing a charged NV center is irradiated with green light and microwaves for exciting the NV center, and fluorescence output from the NV center is detected. The following non-patent document 1 discloses a configuration in which a diamond sensor is placed on a coplanar waveguide and irradiated with microwaves. The diamond substrate is rectangular in shape, excitation light is irradiated from the side of the diamond substrate, and fluorescence is condensed from above the diamond substrate. The following non-patent document 2 discloses a configuration in which a diamond sensor is mounted on a circuit pattern of a single loop coil and irradiated with microwaves. Prior art literature Non-patent literature Non-patent document 1: mountain-increasing androstane, wave-multiple-field androstane, rock-multiple-field mound, "コ tie-tale, guide-way, high sensitivity ma, magnetic force calculation (high sensitivity macrodiamond magnetometer using coplanar waveguide)", seventy-nine application physics society autumn academy lecture pre-draft set (release day: 2018, 9, 5); Non-patent literature 2：Kento Sasaki et al., "Broadband, large-area microwave antenna for optically detected magnetic resonance of nitrogen-vacancy centers in diamond", REVIEW OF SCIENTIFIC INSTRUMENTS 87, 053904 (2016). Disclosure of Invention The diamond sensor according to one aspect of the present disclosure includes diamond having a color center with electron spin, a transmission circuit that transmits electromagnetic waves, an irradiation portion that irradiates the electromagnetic waves transmitted by the transmission circuit to the diamond, at least one of an impedance transformer and a resonator, and a protection circuit that protects an electromagnetic wave source that supplies the electromagnetic waves to the transmission circuit, wherein the impedance transformer is included in the transmission circuit when the impedance transformer is included, reduces or increases an impedance of the electromagnetic wave source for the irradiation portion, the resonator is included in the irradiation portion when the resonator is included, the protection circuit functions as a capacitor for the electromagnetic waves, and functions as an inductor at a frequency lower than a frequency of the electromagnetic waves, wherein the protection circuit is disposed between the impedance transformer and the irradiation portion, between the transmission circuit and a transmission cable that connects the transmission circuit and the electromagnetic wave source, or between the transmission cable and the electromagnetic wave source when the impedance transformer is not included, between the transmission circuit and the transmission cable that connects the transmission circuit and the electromagnetic wave source, or between the transmission cable and the electromagnetic wave source, or between the transmission cable and the electromagnetic wave source. Drawings Fig. 1 is a block diagram showing a schematic configuration of a diamond sensor according to an embodiment of the present disclosure. Fig. 2A is a plan view showing a specific configuration of the diamond sensor shown in fig. 1. Fig. 2B is a front view showing a specific configuration of the diamond sensor shown in fig. 1. Fig. 2C is a bottom view showing a specific configuration of the diamond sensor shown in fig. 1. Fig. 2D is a right side view showing a specific configuration of the diamond sensor shown in fig. 1. Fig. 3 is a block diagram showing a configuration in which a protection circuit is disposed at a position different from that of fig. 1. Fig. 4A is a plan view showing a protection circuit disposed on a coaxial cable. Fig. 4B is a front view showing a protection circuit disposed on the coaxial cable. Fig. 4C is a left side view showing a protection circuit disposed on the coaxial cable. Fig. 5 is a block diagram showing a configuration in which a protection circuit is disposed at a position different from that of fig. 1 and 3. Fig. 6 is a schematic diagram showing a multistage lambda/4 converter. Fig. 7 is a schematic diagram showing a tapered lambda/4 converter. Fig. 8 is a plan view of a resonator sh