Higher order reentrant post modes in cylindrical cavities

McAllister, Ben T.; Shen, Yifan; Flower, Graeme; Parker, Stephen R.; Tobar, Michael E.

doi:10.1063/1.4991751

Cited by 14 publications

(9 citation statements)

References 34 publications

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“…Their mode shape based on the electromagnetic modelling is shown in figure 1(A). It can be seen that modes (1) and (2) are the first and second order re-entrant post modes [51] as these have all the electric field in the gap between the post and lid. (3) and (4), on the other hand, appear to be perturbed rectangular cavity modes that would be degenerate if the cavity had xy symmetry.…”

Section: Resultsmentioning

confidence: 99%

Experimental implementations of cavity-magnon systems: from ultra strong coupling to applications in precision measurement

et al. 2019

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Several experimental implementations of cavity-magnon systems are presented. First an Yttrium Iron Garnet (YIG) block is placed inside a re-entrant cavity where the resulting hybrid mode is measured to be in the ultra strong coupling (USC) regime. When fully hybridised the ratio between the coupling rate and uncoupled mode frequencies is determined to be g/ω=0.46. Next a thin YIG cylinder is placed inside a loop gap cavity. The bright mode of this cavity couples to the YIG sample and is similarly measured to be in the USC regime with ratio of coupling rate to uncoupled mode frequencies as g/ω=0.34. A larger spin density medium such as lithium ferrite (LiFe) is expected to improve couplings by a factor of 1.46 in both systems as coupling strength is shown to be proportional to the square root of spin density and magnetic moment. Such strongly coupled systems are potentially useful for cavity QED, hybrid quantum systems and precision dark matter detection experiments. The YIG disc in the loop gap cavity, is, in particular, shown to be a strong candidate for dark matter detection. Finally, a LiFe sphere inside a two post re-entrant cavity is considered. In past work it was shown that the magnon mode in the sample has a turnover point in frequency (Goryachev et al 2018 Phys. Rev. B 97 155129). Additionally, it was predicted that if the system was engineered such that it fully hybridised at this turnover point the cavity-magnon polariton transition frequency would become insensitive to both first and second order magnetic bias field fluctuations, a result useful for precision frequency applications. This work implements such a system by engineering the cavity mode frequency to near this turnover point, with suppression in sensitivity to second order bias magnetic field fluctuations shown.

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Section: Resultsmentioning

confidence: 99%

Experimental implementations of cavity-magnon systems: from ultra strong coupling to applications in precision measurement

et al. 2019

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“…The gap between the top post and cavity adjusts the mode of frequency and traps the electric field within the gap. The dominant TM 010 mode [17] is utilized in this design. In the parametric study, the radius (r 0 in Fig.…”

Section: Eigen Mode Analysis Of Re-entrant Cavitiesmentioning

confidence: 99%

3D printed re-entrant cavity resonator for complex permittivity measurement of crude oils

Mohammed

Hart

Wood

et al. 2021

Sensors and Actuators A: Physical

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“…A distinct feature of a reentrant cavity is the existence of a gap between the top of the rod and the lid of the cavity. The cavity supports a series of electromagnetic resonant modes 30,31 . The size of the gap between the post and the lid determines the capacitance of the effective lumped LC resonator, and hence strongly influences the resonant frequency of the cavity.…”

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confidence: 99%

Characterisation of Cryogenic Material Properties of 3D-Printed Superconducting Niobium using a 3D Lumped Element Microwave Cavity

McAllister¹,

Bourhill²,

Ma³

et al. 2020

Preprint

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We present an experimental characterisation of the electrical properties of 3D-printed Niobium. The study was performed by inserting a 3D-printed Nb post inside an Aluminium cylindrical cavity, forming a 3D lumped element re-entrant microwave cavity resonator. The resonator was cooled to temperatures below the critical temperature of Niobium (9.25K) and then Aluminium (1.2K), while measuring the quality factors of the electromagnetic resonances. This was then compared with finite element analysis of the cavity and a measurement of the same cavity with an Aluminium post of similar dimensions and frequency, to extract the surface resistance of the Niobium post. The 3D-printed Niobium exhibited a transition to the superconducting state at a similar temperature to the regular Niobium, as well as a surface resistance of 3.1 × 10 −4 Ω. This value was comparable to many samples of traditionally machined Niobium previously studied without specialised surface treatment. Furthermore, this study demonstrates a simple new method for characterizing the material properties of a relatively small and geometrically simple sample of superconductor, which could be easily applied to other materials, particularly 3D-printed materials. Further research and development in additive manufacturing may see the application of 3D-printed Niobium in not only superconducting cavity designs, but in the innovative technology of the future.

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Higher order reentrant post modes in cylindrical cavities

Cited by 14 publications

References 34 publications

Experimental implementations of cavity-magnon systems: from ultra strong coupling to applications in precision measurement

Experimental implementations of cavity-magnon systems: from ultra strong coupling to applications in precision measurement

3D printed re-entrant cavity resonator for complex permittivity measurement of crude oils

Characterisation of Cryogenic Material Properties of 3D-Printed Superconducting Niobium using a 3D Lumped Element Microwave Cavity

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