Journal
PHYSICS LETTERS A
Volume 382, Issue 33, Pages 2199-2204Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2017.09.016
Keywords
Re-entrant cavities; Dark matter search; Negative coupling; Mode volume scaling
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Funding
- Australian Research Council [CE110001013]
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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. (C) 2017 Elsevier B.V. All rights reserved.
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