Standing-wave radio frequency exciter

• US 10,371,760 B2
• Filed: 03/24/2017
• Issued: 08/06/2019
• Est. Priority Date: 03/24/2017
• Status: Active Grant

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Mandeville, Andrew Raymond, Bruce, Gregory Scott, Hahn, Joseph W.
• Primary Examiner(s): Astacio-Oquendo, Giovanni
• Assistant Examiner(s): Fortich, Alvaro E
• Application Number:
  US15/468,582
• Publication Number:
  US 20180275209A1
• Time in Patent Office: 865 Days
• CPC Class Codes: G01R 33/032 using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect

Abstract

A system for magnetic detection includes a magneto-optical defect center material comprising a plurality of magneto-optical defect centers, an optical light source, an optical detector, and a radio frequency (RF) excitation source. The optical light source is configured to provide optical excitation to the magneto-optical defect center material. The optical detector is configured to receive an optical signal emitted by the magneto-optical defect center material. The RF excitation source is configured to provide RF excitation to the magneto-optical defect center material. The RF excitation source includes an RF feed connector, and a metallic material coated on the magneto-optical defect center material and electrically connected to the RF feed connecter.

Claims

1. A system for magnetic detection,comprising:

a magneto-optical defect center material comprising a plurality of magneto-optical defect centers,

a radio frequency (RF) exciter system configured to provide RF excitation to the magneto-optical defect center material;

an optical light source configured to direct excitation light to the magneto-optical defect center material;

an optical detector configured to receive an optical signal emitted by the magneto-optical defect center material based on the excitation light and the RF excitation; and

wherein the RF exciter system comprises;

a

RF source;

a controller configured to control the RF source,

a RF input;

a RF ground;

a microstrip line electrically connected to the RF input and short circuited to the RF ground adjacent the magneto-optical defect center material,

wherein controller is configured to control the RF source such that a standing wave RF field is created in the magneto-optical defect center material.

2. The system of claim 1, wherein the microstrip line comprises conductive traces comprising a first trace having a first width and a first length, and a second trace contacting the first trace, the second trace having a second width and a second length different from the first width and the first length.

3. The system of claim 2, wherein the second trace has an impedance of less than 10Ω

.

4. The system of claim 2, wherein an impedance of the first trace matches a system impedance.

5. The system of claim 4, wherein the first trace has an impedance of about 50Ω

.

6. The system of claim 1, wherein the microstrip line comprises a metallic material coated at least over a top surface, a bottom surface, and a side surface of the magneto-optical defect center material, and is short circuited to the RF ground adjacent the magneto-optical defect center material.

7. The system of claim 2, wherein the microstrip line further comprises a metallic material coated at least over a top surface, a bottom surface, and a side surface of the magneto-optical defect center material, and short circuited to the RF ground adjacent the magneto-optical defect center material.

8. The system of claim 1, wherein the microstrip line has a wavelength of a quarter wavelength of an RF carrier frequency.

12. The system of claim 1, wherein the microstrip line has a wavelength of a quarter wavelength of an RF carrier frequency.

9. A radio frequency (RF) exciter system for providing RF excitation to a magneto-optical defect center material comprising a plurality of magneto-optical defect centers, the RF exciter system comprising:

a RF input;

a controller configured to control an RF source to apply a RF signal to the RF input;

a

RF ground; and

a microstrip line electrically connected to the RF input and short circuited to the RF ground adjacent the magneto-optical defect center material;

wherein the controller is configured to control the RF source to apply the RF signal to the RF input such that a standing wave RF field is created in the magneto-optical defect center material.

10. The RF excitation source of claim 9, wherein the microstrip line comprises conductive traces comprising a first trace having a first width and a first length, and a second trace contacting the first trace, the second trace having a second width and a second length different from the first width and the first length.

11. The RF excitation source of claim 9, wherein the microstrip line comprises a metallic material coated at least over a top surface, a bottom surface, and a side surface of the magneto-optical defect center material, and is short circuited to the RF ground adjacent the magneto-optical defect center material.

13. A radio frequency (RF) exciter system, comprising:

a RF exciter circuit for providing RF excitation to a magneto-optical defect center material comprising a plurality of magneto-optical defect centers, the RF exciter circuit comprising;

a RF input;

a RF ground; and

a microstrip line electrically connected to the RF input and short circuited to the ground adjacent the magneto-optical defect center material;

a controller configured to control a RF source to apply an RF signal to the RF input;

wherein the controller is configured to control the RF source to apply the RF signal to the RF input such that a standing wave RF field is created in the magneto-optical defect center material; and

a RF termination component configured to reduce back reflection of a RF signal from a short circuit.

14. The circuit of claim 13, wherein the RF termination component comprises one of a non-reciprocal isolator device, or a balanced amplifier configuration.

15. The circuit of claim 13, wherein the microstrip line comprises a metallic material coated at least over a top surface, a bottom surface, and a side surface of the magneto-optical defect center material, and is short circuited to the RF ground adjacent the magneto-optical defect center material.

16. The system of claim 13, wherein the microstrip line has a wavelength of a quarter wavelength of an RF carrier frequency.