Tunable supermode dielectric resonators for axion dark-matter haloscopes

Ben T. McAllister, Graeme Flower, Lucas E. Tobar, Michael E. Tobar

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We present frequency-tuning mechanisms for dielectric resonators, which undergo "supermode" interactions as they tune. The tunable schemes are based on dielectric materials strategically placed inside traditional cylindrical resonant cavities, necessarily operating in transverse-magnetic modes for use in axion haloscopes. The first technique is based on multiple dielectric disks with radii smaller than that of the cavity. The second scheme relies on hollow dielectric cylinders similar to a Bragg resonator, but with a different location and dimension. Specifically, we engineer a significant increase in form factor for the TM030 mode utilizing a variation of a distributed Bragg reflector resonator. Additionally, we demonstrate an application of traditional distributed Bragg reflectors in TM modes which may be applied to a haloscope. Theoretical and experimental results are presented showing an increase in Q factor and tunability due to the supermode effect. The TM030 ring-resonator mode offers a between 1 and 2-order-of-magnitude improvement in axion sensitivity over current conventional cavity systems and will be employed in the forthcoming ORGAN experiment.

Original languageEnglish
Article number014028
JournalPhysical Review Applied
Volume9
Issue number1
DOIs
Publication statusPublished - 26 Jan 2018

Fingerprint Dive into the research topics of 'Tunable supermode dielectric resonators for axion dark-matter haloscopes'. Together they form a unique fingerprint.

  • Cite this