Silicon-based magnetometer

Patent metadata

Field	Value
Publication number	US-9753102-B1
Application number	US-201414190656-A
Country	US
Kind code	B1
Filing date	Feb 26, 2014
Priority date	Feb 28, 2013
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

Systems and methods for a magnetometer comprise a single-isotope silicon crystal doped with impurity atoms. The Larmor precession associated with energy level transitions of the impurity atoms may be detected and used to measure an external magnetic field.

First claim

Therefore, the following is claimed:

1. A magnetometer, comprising:
a single-isotope silicon crystal doped with impurity atoms, wherein a Larmor precession associated with energy level transitions of the impurity atoms is detected and used to measure an external magnetic field, and wherein the Larmor precession is detected electrically based at least in part on a photoconductivity measurement of the single-isotope silicon crystal.

2. The magnetometer of claim 1 , wherein the single-isotope silicon crystal is a 28 Si crystal.

3. The magnetometer of claim 1 , wherein the impurity atoms are single-isotope impurity atoms.

4. The magnetometer of claim 1 , wherein the impurity atoms are selected from the group consisting of phosphorus (P), arsenic (As), antimony (Sb), lithium (Li), sodium (Na), sulfur (S), selenium (Se), tellurium (Te), boron (B), gallium (Ga), indium (In), aluminum (Al), beryllium (Be), zinc (Zn), gold (Au), silver (Ag), platinum (Pt), bismuth (Bi), and copper (Cu) atoms, and combinations thereof.

5. The magnetometer of claim 1 , wherein the energy level transitions originate from neutral donors or acceptors of the impurity atoms.

6. The magnetometer of claim 1 , further comprising a light source adapted to excite the impurity atoms within the silicon crystal.

7. The magnetometer of claim 6 , further comprising an apparatus configured to interrogate hyperfine splitting resulting from an interaction of impurity nuclei and donor electrons.

8. The magnetometer of claim 1 , further comprising at least two capacitor plates positioned at opposite ends of the single-isotope silicon crystal, the at least two capacitor plates adapted to measure photoconductivity.

9. The magnetometer of claim 1 , wherein the magnetometer is operable at room temperature.

10. A method for measuring a magnetic field, the method comprising
applying light from one or more light sources onto a single-isotope silicon crystal to excite impurity atoms of the single-isotope silicon crystal;
detecting a Larmor precession associated with the impurity atoms of the single-isotope silicon crystal based at least in part on energy level transitions of the impurity atoms; and
calculating a magnetic field measurement based at least in part on the Larmor precession,
wherein detecting the Larmor precession comprises detecting changes in photoconductivity of the single-isotope silicon crystal.

11. The method of claim 10 , wherein the single-isotope silicon crystal is a 28 Si crystal.

12. The method of claim 10 , wherein the impurity atoms are single-isotope impurity atoms.

13. The method of claim 10 , wherein the impurity atoms are selected from the group consisting of phosphorus (P), arsenic (As), antimony (Sb), lithium (Li), sodium (Na), sulfur (S), selenium (Se), tellurium (Te), boron (B), gallium (Ga), indium (In), aluminum (Al), beryllium (Be), zinc (Zn), gold (Au), silver (Ag), platinum (Pt), bismuth (Bi), and copper (Cu) atoms, and combinations thereof.

14. The method of claim 10 , wherein detecting the Larmor precession comprises detecting resonance of hyperfine splitting levels resulting from the energy level transitions originating from neutral donors or acceptors of the impurity atoms.

15. The method of claim 10 , further comprising applying a nuclear magnetic resonance to the single-isotope silicon crystal to interrogate hyperfine splitting resulting from an interaction of impurity nuclei and donor electrons.

16. The method of claim 10 , further comprising applying a pump laser and a probe laser to the single-isotope silicon crystal to optically detect the Larmor precession.

17. A magnetometer, comprising:
a single-isotope silicon crystal doped with impurity atoms, wherein a Larmor precession associated with energy level transitions of the impurity atoms is detected and used to measure an external magnetic field, and wherein the Larmor precession is detected optically.

18. The magnetometer of claim 17 , further comprising a pump laser and a probe laser for optically detecting the Larmor precession, wherein the pump laser projects light onto the single-isotope silicon crystal in the z-direction and the probe laser projects light onto the single-isotope silicon crystal in the x-direction.

19. The magnetometer of claim 17 , wherein the single-isotope silicon crystal is a 28 Si crystal.

20. The magnetometer of claim 17 , wherein the magnetometer is operable at room temperature.

Assignees

• Univ South Florida

Inventors

• Karaiskaj Denis

Classifications

• G01R33/26 Primary

  using optical pumping · CPC title

• G01R33/24 Primary

  for measuring direction or magnitude of magnetic fields or magnetic flux · CPC title