Microwave frequency magnetic field manipulation systems and methods and associated application instruments, apparatus and system

Patent metadata

Field	Value
Publication number	US-10290916-B2
Application number	US-201515503429-A
Country	US
Kind code	B2
Filing date	Aug 12, 2015
Priority date	Aug 12, 2014
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

A microwave frequency magnetic field manipulation system 10 comprises a re-entrant microwave cavity 12 having a substantially continuous and closed internal surface 14 with at least two opposite sides 16 and 18. Two or more posts, P1, P2, . . . Pn (hereinafter referred to in general as “posts P”) are provided in the cavity 12. The posts P are in physical and more particularly electrical contact with one of the sides 16. Respective gaps G are or can be formed between free ends of the posts P and the side 18. The system 10 also has a signal source 20 coupled to the cavity 12 for supplying microwaves. The source 20 supplies microwave signals at frequencies that facilitate the generation of magnetic fields in opposite directions about at least two mutually adjacent posts P. Accordingly the magnetic field is reinforced in a common region 22 between the mutually adjacent posts P.

First claim

The invention claimed is:

1. A microwave frequency magnetic field manipulation system comprising:
a re-entrant microwave cavity resonator having a substantially continuous and closed internal surface with at least two opposed sides, and at least two posts which are in physical contact with a first of the at least two opposed sides and extend toward a second of the two opposed sides the at least two posts being dimensioned or positionable to form or enable the formation of respective gaps between free ends posts and the second of the two opposed sides; and
one or more signal sources coupled to the cavity for supplying microwave signals at resonant frequencies above the fundamental frequency of the cavity to facilitate the generation of electric fields in the gaps and associated magnetic fields in opposite direction about two mutually adjacent ones of the at least two posts such that the magnetic fields reinforce each other in a focusing region between the at least two mutually adjacent posts.

2. The microwave frequency magnetic field manipulation system according to claim 1 comprising a cooling system capable of cooling the cavity to milliKelvin temperatures.

3. The microwave frequency magnetic field manipulation system according to claim 1 comprising a DC electric field generator arranged to produce an electric field, separate to the electric fields generated by the one or more sources, extending across the gaps in a direction parallel to a length direction of the at least two posts.

4. The microwave frequency magnetic field manipulation system according to claim 1 comprising a tuning system arranged to enable variation of dielectric properties of the each gap independently of each other.

5. The microwave frequency magnetic field manipulation system according to claim 4 wherein the tuning system comprises a mechanism capable of varying a length dimension of each gap independently of each other.

6. The microwave frequency magnetic field manipulation system according to claim 4 wherein the tuning system comprises one or more pieces of dielectric material configured to be capable of insertion into and removal from respective gaps.

7. The microwave frequency magnetic field manipulation system according to claim 1 wherein the at least two posts are arranged in a one dimensional array.

8. The microwave frequency magnetic field manipulation system according to claim 1 wherein the at least two posts are arranged in a two dimensional array.

9. The microwave frequency magnetic field manipulation system according to claim 1 wherein the at least two posts are arranged in a three dimensional array.

10. The microwave frequency magnetic field manipulation system according to claim 1 comprising a programmable system associated with the at least two posts and capable of selectively varying the size of the gap for each post individually including closing the gap to zero wherein a respective one of the at least two posts is short circuited across opposed sides of the cavity.

11. The microwave frequency magnetic field manipulation system according to claim 1 comprising a DC magnetic field generator arranged to produce a magnetic field, separate to the magnetic fields generated by one or more sources, having lines of flux extending parallel to a length direction of the at least two posts.

12. The microwave frequency magnetic field manipulation system according to claim 1 comprising a crystal resonator disposed in the focusing region between the mutually adjacent posts.

13. The microwave frequency magnetic field manipulation system according to claim 12 wherein the crystal resonator is a single crystal resonator.

14. A method of producing a focused magnetic field in a multi-post re-entrant microwave cavity resonator having a plurality of posts, each post having one end in direct physical contact with a first portion of an inner surface of the cavity and an opposite end located or positionable to form or enable the formation of a respective gap with a second portion of the inner surface, the method comprising: exciting the cavity with microwave signals at second or higher harmonic frequencies to facilitate generation of electric fields in the respective gaps in directions to form corresponding magnetic fields in opposite direction about adjacent ones of the plurality of posts such that the magnetic fields reinforce each other in respective focusing regions generated between adjacent ones of the plurality of posts.

15. The method according to claim 14 comprising evacuating the cavity of a first fluid and subsequently at least partially filling the cavity with a second fluid which is different to the first fluid.

16. The method according to claim 14 comprising placing a crystal resonator in at least one of the focusing regions generated about adjacent ones of the plurality of posts when the cavity is excited with microwave signals at second or higher harmonic frequencies.

17. The method according to claim 14 further comprising inducing ultra-strong photon magnon coupling by:
placing a crystal resonator in at least one of the focusing regions; and exciting the cavity at second or higher order eigen-frequencies to produce at least two magnetic fields such that the magnetic fields reinforce each other in the at least one of the focusing regions.

18. The method according to claim 17 comprising configuring the cavity relative to the crystal resonator to provide a cavity photon to crystal magnon coupling of at least 2 GHz.

19. The method according claim 14 comprising at least partially filling the cavity with a fluid.

20. The method according to claim 14 comprising configuring the cavity relative to the crystal resonator to provide a filling factor of at least 10%.

Assignees

• Univ Western Australia

Inventors

• Tobar Michael Edmund
• Goryachev Maxim

Classifications

• H05K7/20

  Modifications to facilitate cooling, ventilating, or heating · CPC title

• H03H9/17

  having a single resonator (crystal tuning forks H03H9/21) · CPC title

• H01P7/06 Primary

  Cavity resonators · CPC title

• H01P1/2053 Primary

  the coaxial cavity resonators being disposed parall to each other · CPC title

• H03H9/54

  comprising resonators of piezoelectric or electrostrictive material (comprising resonators using surface acoustic waves H03H9/64) · CPC title