Rigorous analysis of highly tunable cylindrical transverse magnetic mode re-entrant cavities

Floch, Jean-Michel Le; Fan, Y.; Aubourg, Michel; Cros, Dominique; Carvalho, Natália C.; Shan, Q.; Bourhill, Jeremy; Ivanov, Eugene; Humbert, Georges; Madrangeas, Valérie; Tobar, Michael E.

doi:10.1063/1.4848935

Cited by 42 publications

(43 citation statements)

References 48 publications

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“…For this platform, it has been demonstrated that by an a priori rearrangement of the post, one can easily engineer the device resonance frequencies and field patterns to achieve high frequency and space localisation [14] that guarantees strong coupling regimes [18,19]. On the other hand, due to high localisation of electric field in the post gaps, such cavities appear to be highly tunable by mechanical actuators that outperform any kind of magnetic field tuning in terms of speed [20].In this work, we use some of the discussed capabilities of the reentrant cavity platform in order to reach a new cavity QED interaction regime: superstrong coupling. This name refers to a regime for which the coupling strength g exceeds not only the spin ensemble Γ and cavity δ loss rates, but also the free spectral range ω FSR [21,43,44].…”

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Superstrong coupling of a microwave cavity to yttrium iron garnet magnons

Kostylev

Goryachev

Tobar

2016

Applied Physics Letters

161

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Multiple-post reentrant 3D lumped cavity modes have been realized to design the concept of discrete Whispering Gallery and Fabry-Pérot-like Modes for multimode microwave Quantum Electrodynamics experiments. Using a magnon spin-wave resonance of a submillimeter-sized Yttrium-IronGarnet sphere at milliKelvin temperatures and a four-post cavity, we demonstrate the ultra-strong coupling regime between discrete Whispering Gallery Modes and a magnon resonance with strength of 1.84 GHz. By increasing the number of posts to eight and arranging them in a D4 symmetry pattern, we expand the mode structure to that of a discrete Fabry-Pérot cavity and modify the Free Spectral Range (FSR). We reach the superstrong coupling regime, where spin-photon coupling strength is larger than FSR, with coupling strength in the 1.1 to 1.5 GHz range.Cavity Quantum Electrodynamics (QED) is a conceptual paradigm dealing with light-matter interaction at the quantum level that has been investigated in a number of various systems. There is a broad range of various problems that have to be solved by cavity QED including generation of nonclassical states[1], quantum memory [2], quantum frequency conversion [3,4], etc. For many of these applications, it is important to combine advantages of different approaches to QED in a Hybrid Quantum System (HQS) [5,6]. For example, combination of nonlinear properties of superconducting circuits based on Josephson Junction and large electron [7] or nuclearspin[8] ensembles can be used for new quantum protocols without single spin manipulation and is investigated in many physical implementations [9][10][11][12][13].In the process of HQS design, it is vital to be able to engineer photon modes by continuous adjustment of system parameters without reinventing a new cavity. It is important to have a single platform that can provide a broad range of spectra required for each particular purpose. Moreover, in order to achieve strong coupling with other elements of HQS, such a platform should guarantee reconfigurable high space localisation of both electrical and magnetic fields to achieve sufficient filling factors. Finally, such cavities are required to be adjustable in-situ in the wide range preferably at high speed rate. These features are lacking for traditional 3D cavities such as box resonators and microwave Whispering Gallery Mode resonators. Having only one or two free parameters to control, these platforms can be hard to modify for a particular set of requirements in terms of field patterns, spectra and tunability without significant change of their structure.All the described requirements are met by constructing designs based on the recently proposed multi-post reentrant cavity [14,15] that is based on a known 3D closed resonator with a central post gap [16,17]. For this platform, it has been demonstrated that by an a priori rearrangement of the post, one can easily engineer the device resonance frequencies and field patterns to achieve high frequency and space localisation [14] that guarantees strong coupli...

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confidence: 99%

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confidence: 99%

Superstrong coupling of a microwave cavity to yttrium iron garnet magnons

Kostylev

Goryachev

Tobar

2016

Applied Physics Letters

161

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“…Recently, a 3D version of this resonator, a multi-post reentant cavity [30][31][32], has been proposed as a controllable base for metastructures [33][34][35]. Such a system is made up of a number of conducting posts attached to one cavity wall and closely approaching another with their tips.…”

Section: B Physical Implementationmentioning

confidence: 99%

Axion detection with negatively coupled cavity arrays

2018

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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.

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“…But when the cavity model dimension meets the condition ≪ ℎ, as shown in Figure 1(a), and the geometric dimension is smaller than the resonant wavelength, we can assume that the high frequency electric field of the cavity dominant mode TM 010 is mainly distributed among the space with height , while the magnetic field is distributed around the embedded cylinder which presents annular concentration [12][13][14] as shown in Figure 1(a). So we obtain the equivalent lumped circuit model in electrostatic field by analysis of the distributed model according to [15]. The equivalent shunt circuit model is shown in Figure 1(b).…”

Section: Design Characterization and Fabrication Of The Sensormentioning

confidence: 99%

Highly Sensitive Reentrant Cavity-Microstrip Patch Antenna Integrated Wireless Passive Pressure Sensor for High Temperature Applications

Guo

Tan

et al. 2017

Journal of Sensors

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A novel reentrant cavity-microstrip patch antenna integrated wireless passive pressure sensor was proposed in this paper for high temperature applications. The reentrant cavity was analyzed from aspects of distributed model and equivalent lumped circuit model, on the basis of which an optimal sensor structure integrated with a rectangular microstrip patch antenna was proposed to better transmit/receive wireless signals. In this paper, the proposed sensor was fabricated with high temperature resistant alumina ceramic and silver metalization with weld sealing, and it was measured in a hermetic metal tank with nitrogen pressure loading. It was verified that the sensor was highly sensitive, keeping stable performance up to 300 kPa with an average sensitivity of 981.8 kHz/kPa at temperature 25 ∘ C, while, for high temperature measurement, the sensor can operate properly under pressure of 60-120 kPa in the temperature range of 25-300 ∘ C with maximum pressure sensitivity of 179.2 kHz/kPa. In practical application, the proposed sensor is used in a method called table lookup with a maximum error of 5.78%.

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Rigorous analysis of highly tunable cylindrical transverse magnetic mode re-entrant cavities

Cited by 42 publications

References 48 publications

Superstrong coupling of a microwave cavity to yttrium iron garnet magnons

Superstrong coupling of a microwave cavity to yttrium iron garnet magnons

Axion detection with negatively coupled cavity arrays

Highly Sensitive Reentrant Cavity-Microstrip Patch Antenna Integrated Wireless Passive Pressure Sensor for High Temperature Applications

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