### Abstract

Using eigenmode analysis and full 3D FEM modelling, we demonstrate that a closed cavity built of an array of elementary harmonic oscillators with negative mutual couplings exhibits a dispersion curve with lower order modes corresponding to higher frequencies. Such cavity arrays may help to achieve large mode volumes for boosting sensitivity of the axion searches, where the mode volume for the composed array scales proportional to the number of elements, but the frequency remains constant. The negatively coupled cavity array is demonstrated with magnetically coupling coils, where the sign of next-neighbour coupling (controlled with their chirality) sets the dispersion curve properties of the resonator array medium. Furthermore, we show that similar effects can be achieved using only positively coupled cavities of different frequencies assembled in periodic cells. This principle is demonstrated for the multi-post re-entrant system, which can be realised with an array of straight metallic rods organised in chiral structures.

Original language | English |
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Pages (from-to) | 2199-2204 |

Number of pages | 6 |

Journal | Physics Letters, Section A: General, Atomic and Solid State Physics |

Volume | 382 |

Issue number | 33 |

DOIs | |

Publication status | Published - 25 Aug 2018 |

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**Axion detection with negatively coupled cavity arrays.** / Goryachev, Maxim; McAllister, Ben T.; Tobar, Michael E.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Axion detection with negatively coupled cavity arrays

AU - Goryachev, Maxim

AU - McAllister, Ben T.

AU - Tobar, Michael E.

PY - 2018/8/25

Y1 - 2018/8/25

N2 - Using eigenmode analysis and full 3D FEM modelling, we demonstrate that a closed cavity built of an array of elementary harmonic oscillators with negative mutual couplings exhibits a dispersion curve with lower order modes corresponding to higher frequencies. Such cavity arrays may help to achieve large mode volumes for boosting sensitivity of the axion searches, where the mode volume for the composed array scales proportional to the number of elements, but the frequency remains constant. The negatively coupled cavity array is demonstrated with magnetically coupling coils, where the sign of next-neighbour coupling (controlled with their chirality) sets the dispersion curve properties of the resonator array medium. Furthermore, we show that similar effects can be achieved using only positively coupled cavities of different frequencies assembled in periodic cells. This principle is demonstrated for the multi-post re-entrant system, which can be realised with an array of straight metallic rods organised in chiral structures.

AB - Using eigenmode analysis and full 3D FEM modelling, we demonstrate that a closed cavity built of an array of elementary harmonic oscillators with negative mutual couplings exhibits a dispersion curve with lower order modes corresponding to higher frequencies. Such cavity arrays may help to achieve large mode volumes for boosting sensitivity of the axion searches, where the mode volume for the composed array scales proportional to the number of elements, but the frequency remains constant. The negatively coupled cavity array is demonstrated with magnetically coupling coils, where the sign of next-neighbour coupling (controlled with their chirality) sets the dispersion curve properties of the resonator array medium. Furthermore, we show that similar effects can be achieved using only positively coupled cavities of different frequencies assembled in periodic cells. This principle is demonstrated for the multi-post re-entrant system, which can be realised with an array of straight metallic rods organised in chiral structures.

KW - Dark matter search

KW - Mode volume scaling

KW - Negative coupling

KW - Re-entrant cavities

UR - http://www.scopus.com/inward/record.url?scp=85029501567&partnerID=8YFLogxK

U2 - 10.1016/j.physleta.2017.09.016

DO - 10.1016/j.physleta.2017.09.016

M3 - Article

VL - 382

SP - 2199

EP - 2204

JO - Physics Letters A

JF - Physics Letters A

SN - 0375-9601

IS - 33

ER -