Frequency flicker of 2.3 GHz AlN-sapphire high-overtone bulk acoustic resonators

Boudot, Rodolphe; Martin, Gilles; Friedt, Jean‐Michel; Rubiola, Enrico

doi:10.1063/1.4972102

Cited by 11 publications

(3 citation statements)

References 31 publications

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“…Another interesting phenomenon shown in this figure is the increase of noise in the generation regime (curve (2)). Such excess noise in BAW devices and its dependence on power levels have been a subject of investigation for many decades as it limits the performance of these devices at room temperature 46,47 . Although the origins of such phenomena are still unknown.…”

Section: Resonance Of the Systemmentioning

confidence: 99%

“…Other applications include sensors, phonon based computations 50 and tests of fundamental physics tests [19][20][21][22] . Finally, such system may be used to improve the BAW device technology through deeper understanding of fundamental processes in solid state acoustics and limiting mechanisms such as the drive level sensitivity and excess noise 46,47 .…”

Section: Frommentioning

confidence: 99%

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Generation of ultralow power phononic combs

Goryachev

Galliou

Tobar

2020

Phys. Rev. Research

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We demonstrate excitation of phononic frequency combs in a Bulk Acoustic Wave system at a temperature of 20mK using a single tone low power signal source. The observed ultra low power threshold is due to a combination of very high quality factor of 4.2 × 10 8 and relatively strong nonlinear effects. The observed repetition rate of the comb varies from 0.7 to 2Hz and spans over tens of Hz. The demonstrated system is fully excited via piezoelectricity and does not require mode spectra engineering and external optical or microwave signals. It is shown that the comb profile significantly depends on geometry of excitation and detection electrodes. Observed strong Duffing nonlinearity below the generation threshold suggests that the system is a phononic analogue to Kerr frequency combs excited in monolithic optical microresonators. The ultra-low power regime opens a way of integrating this phononic system with quantum hybrid systems such as impurity defects and superconducting qubits.Photonic frequency combs generators are an important tool used for many scientific applications allowing to couple distant parts of frequency spectrum 1 . Amongst others, these important applications include ultra stable clocks and frequency metrology 2-4 and spectroscopy 5,6 . All of these system are photonic mostly utilising a carrier signal at an optical frequency and RF or microwave repetition rates. The most popular ways to generate such combs include mode-locked lasers 7 , (four)wave mixing/Kerr nonlinearity [8][9][10][11] . Despite the fact that phononic systems also play an important role in metrology and spectroscopy, demonstration of phononic or acoustic wave combs have been sporadic 12 . Moreover, their complexity, requirements to design a certain mode structure, very high threshold powers 13 and requirement for extra laser sources 14 make these systems inapplicable for many low energy applications. In these applications Bulk Acoustic Wave (BAW) devices found very extensive use, e.g. frequency metrology 15 , quantum hybrid systems 16-18 and fundamental physics tests [19][20][21][22] . Additionally both bulk and surface acoustic wave devices are utilised for spectroscopy 23 , detection and sensors [24][25][26] . Recently nonlinear dynamics of mechanical systems including comb generation has also became a subject of theoretical research 27 . All these areas could benefit from designing devices with frequency comb functionality.To excite frequency combs at low power levels, one needs a system with low losses and strong nonlinear effects. For these reasons, in this work, we employ a phonon trapping 28 SC-cut 29 quartz BAW cavity 30 operating at 20mK. The device is an SC-cut plano-convex shaped plate of 1mm thickness, 23mm diameter and 300mm the radius of curvature. Quartz BAW cavities have demonstrated extremely high values of Quality factors at cryogenic temperatures reaching the level of a) Electronic mail: maxim.goryachev@uwa.edu.au 8 × 10 919,30 . In the same time these devices are able to demonstrate a significant levels of non...

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Section: Resonance Of the Systemmentioning

confidence: 99%

Section: Frommentioning

confidence: 99%

Generation of ultralow power phononic combs

Goryachev

Galliou

Tobar

2020

Phys. Rev. Research

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“…In the config-uration presented in Fig. 1 the whole YIG/GGG structure acts as an effective high-overtone bulk acoustic resonator (HBAR) [11,36,37]. Note, that HBARs among all the known acoustic resonators demonstrate the highest Q-factor (up to 10 14 ), making the proposed YIG/GGG MAR design well-suited for the realization of low phase noise local oscillators.…”

Section: Introductionmentioning

confidence: 99%

A tunable magneto-acoustic oscillator with low phase noise

Litvinenko,

Khymyn,

Tyberkevych

et al. 2020

Preprint

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A frequency-tunable low phase noise magneto-acoustic resonator is developed on the base of a parallel-plate straight-edge bilayer consisting of a yttrium-iron garnet (YIG) layer grown on a substrate of a gallium-gadolinium garnet(GGG). When a YIG/GGG sample forms an ideal parallel plate, it supports a series of high-quality-factor acoustic modes standing along the plate thickness. Due to the magnetostriction of the YIG layer the ferromagnetic resonance (FMR) mode of the YIG layer can strongly interact with the acoustic thickness modes of the YIG/GGG structure, when the modes' frequencies match. A particular acoustic thickness mode used for the resonance excitations of the hybrid magneto-acoustic oscillations in a YIG/GGG bilayer is chosen by the YIG layer FMR frequency, which can be tuned by the variation of the external bias magnetic field. A composite magneto-acoustic oscillator, which includes an FMR-based resonance pre-selector, is developed to guarantee satisfaction of the Barkhausen criteria for a single-acoustic-mode oscillation regime. The developed low phase noise composite magneto-acoustic oscillator can be tuned from 0.84 GHz to 1 GHz with an increment of about 4.8 MHz (frequency distance between the adjacent acoustic thickness modes in a YIG/GGG parallel plate), and demonstrates the phase noise of -116 dBc/Hz at the offset frequency of 10 KHz.

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Almost All About Phase Noise

2021

Microwave and Wireless Synthesizers

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Frequency flicker of 2.3 GHz AlN-sapphire high-overtone bulk acoustic resonators

Cited by 11 publications

References 31 publications

Generation of ultralow power phononic combs

Generation of ultralow power phononic combs

A tunable magneto-acoustic oscillator with low phase noise

Almost All About Phase Noise

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