Low-loss materials for high Q-factor Bragg reflector resonators

Floch, Jean-Michel Le; Tobar, Michael E.; Cros, Dominique; Křupka, J.

doi:10.1063/1.2828025

Cited by 17 publications

(23 citation statements)

References 27 publications

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“…Due to the number of modes used in the fit it is necessary to determine the filling factors using a rigorous electomagnetic simulation of the whispering gallery modes. 43 Because the density of modes is high and the simulation process lengthy, the determination of the correct modes is often difficult. As a result, we extract the product ηN from the real part of the ac susceptibility, then normalize the product to the highest value obtained from the fit.…”

Section: Ion Concentration and Spin-spin Relaxation Timementioning

confidence: 99%

Hybrid electron spin resonance and whispering gallery mode resonance spectroscopy of Fe3+in sapphire

et al. 2013

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The development of a new era of quantum devices requires an understanding of how paramagnetic dopants or impurity spins behave in crystal hosts. Here, we describe a spectroscopic technique which uses traditional electron spin resonance (ESR) combined with the measurement of a large population of electromagnetic whispering gallery modes. This allows the characterization of the physical parameters of paramagnetic impurity ions in the crystal at low temperatures. We present measurements of two ultrahigh-purity sapphires cooled to 20 mK in temperature, and determine the concentration of Fe 3+ ions and their frequency sensitivity to a dc magnetic field. Our method is different from ESR in that it is possible to track the resonant frequency of the ion from zero applied magnetic field to any arbitrary value, allowing excellent measurement precision. This high precision reveals anisotropic behavior of the Zeeman splitting. In both crystals, each Zeeman component demonstrates a different g factor.

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Section: Ion Concentration and Spin-spin Relaxation Timementioning

confidence: 99%

Hybrid electron spin resonance and whispering gallery mode resonance spectroscopy of Fe3+in sapphire

et al. 2013

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“…In a traditional Bragg resonator a dielectric layer inside a cavity creates a virtual boundary condition and thus increases the geometry factor of the resonance, as the mode electromagnetic field is shielded from the comparatively lossy conducting cavity walls. This effect is well documented in the literature for a variety of Transverse Electric modes, and is used to boost quality factors as all wall losses may be decoupled from the mode simultaneously [36][37][38][39][40]. For this effect to work the electric field pattern of the mode must be tangential to the cavity walls.…”

Section: B Dielectric Ringsmentioning

confidence: 99%

Tunable Supermode Dielectric Resonators for Axion Dark-Matter Haloscopes

et al. 2018

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We present frequency tuning mechanisms for dielectric resonators, which undergo "super-mode" 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 of different location and dimension. In particular we engineer a significant increase in form factor for the TM030 mode utilising a variation of a Distributed Bragg Reflector Resonator. Additionally, we demonstrate application of traditional Distributed Bragg Reflectors in TM modes, which may be applied to a haloscope. This is the first demonstration of Bragg resonators applied to TM modes, as well as the first application of super-modes to tune Bragg resonators, or haloscope resonators. Theory and experimental results are presented showing an increase in Q-factor and tunability due to the super-mode effect. The TM030 ring resonator mode offers between 1 and 2orders-of-magnitude improvement in axion sensitivity over current conventional cavity systems and will be employed in the forthcoming ORGAN experiment.

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“…For the structure shown in figure 4 this can be done by employing one of several rigorous techniques, e.g. finite element, 15 finite difference (method of lines) 16 or mode matching. 17 Figure 4: Density plot (modulus squared) of the tangential electric field component E q for the fundamental mode TE 01δ calculated using the method of lines in a diamond loaded copper cavity.…”

Section: Measurement Setupmentioning

confidence: 99%

Cryogenic properties of a diamond sample at microwave frequencies

Floch¹,

Hartnett²,

Tobar³

et al. 2010

2010 International Conference on Electromagnetics in Advanced Applications

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International audienceDielectric resonators are key components for many microwave and millimetre wave applications, including high-Q filters and frequency-determining elements for precision frequency synthesis. Multilayered, bulk low-loss crystal and polycrystalline dielectric structures have become very important for designing these devices. Proper design requires careful electromagnetic characterisation of low-loss material properties. This includes exact simulation with precision numerical software and precise measurements of resonant modes. Diamond has been recently utilized for an increasing amount of electronic applications. This paper will present the common techniques for characterizing such dielectric samples in the microwave regime, and apply it to the characterization of diamond from 35 to 330K

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Low-loss materials for high Q-factor Bragg reflector resonators

Cited by 17 publications

References 27 publications

Hybrid electron spin resonance and whispering gallery mode resonance spectroscopy of Fe3+in sapphire

Hybrid electron spin resonance and whispering gallery mode resonance spectroscopy of Fe3+in sapphire

Tunable Supermode Dielectric Resonators for Axion Dark-Matter Haloscopes

Cryogenic properties of a diamond sample at microwave frequencies

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