Quartz tuning fork as a probe of surface oscillations

Todoshchenko, Igor; Savin, A. M.; Haataja, Miika; Kaikkonen, Jukka-Pekka; Hakonen, Pertti

doi:10.1063/1.4976093

Cited by 3 publications

(3 citation statements)

References 21 publications

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“…A 1.53 µm continuous wave, distributed feedback (CW-DFB) fiber-coupled diode laser (Agilecom Photonics Solutions, China) was used as the laser excitation source. A commercially available QTF with a resonance frequency f 0 of ~32.76 kHz is typically employed in many QTF based sensors [20][21][22][23][24]. In order to improve the signal amplitude a QTF with f 0 of 30.72 kHz (Jingyuxing Technology, China) was utilized, since the effective integration time of the QTF is inversely proportional to its resonant frequency [25].…”

Section: Methodsmentioning

confidence: 99%

Quartz-tuning-fork enhanced photothermal spectroscopy for ultra-high sensitive trace gas detection

et al. 2018

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A gas sensing method based on quartz-tuning-fork enhanced photothermal spectroscopy (QEPTS) is reported in this paper. Unlike usually used thermally sensitive elements, a sharply resonant quartz-tuning-fork with the capability of enhanced mechanical resonance was used to amplify the photothermal signal level. Acetylene (C 2 H 2) detection was used to verify the QEPTS sensor performance. The measured results indicate a minimum detection limit (MDL) of 718 ppb and a normalized noise equivalent absorption coefficient (NNEA) of 7.63 × 10 −9 cm −1 W/√Hz. This performance demonstrates that QEPTS can be an ultra-high sensitive technique for gas detection and shows superiority when compared to usually used methods of tunable diode laser absorption spectroscopy (TDLAS) and quartzenhanced photoacoustic spectroscopy (QEPAS). Furthermore, when compared to an optical detector, especially a costly mercury cadmium telluride (MCT) detector with cryogenic cooling used in TDLAS, a quartz-tuning-fork is much cheap and tiny. Besides, compared to the QEPAS technique, QEPTS is a non-contact measurement technique and therefore can be used for standoff and remote trace gas detection.

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Section: Methodsmentioning

confidence: 99%

Quartz-tuning-fork enhanced photothermal spectroscopy for ultra-high sensitive trace gas detection

et al. 2018

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“…For the detection of the crystal surface displacement, we employed the oscillating fork scheme tested by our team earlier in the experiments on crystallization waves in 4 He [26]. A quartz tuning fork is driven at its resonant frequency where the sensitivity of its out of phase signal to a change in the resonator mass is maximal.…”

Section: Preliminary Experiments In Helsinkimentioning

confidence: 99%

“…The sensitivity of such a double-resonance scheme rapidly increases with decreasing distance between the fork's prongs and the surface of the crystal. The maximum possible sensitivity (when prongs almost touch the surface) is as high as 1 kHz/mm, i.e., 1 mHz/nm [26].…”

Section: Preliminary Experiments In Helsinkimentioning

confidence: 99%

Evidence for Magnetic Crystallization Waves at the Surface of $$^3$$He Crystal

Todoshchenko,

Savin,

Hakonen

2024

J Low Temp Phys

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Ultralow temperature crystals of the helium isotopes $$^3$$ 3 He and $$^4$$ 4 He are intriguing quantum systems. Deciphering the complex features of these unusual materials has been made possible in large part by Alexander Andreev’s groundbreaking research. In 1978, Andreev and Alexander Parshin predicted the existence of melting/freezing waves at the surface of a solid $$^4$$ 4 He crystal, which was subsequently promptly detected. Successively, for the fermionic $$^3$$ 3 He superfluid/solid interface, even more intricate crystallization waves were anticipated, although they have not been observed experimentally so far. In this work, we provide preliminary results on $$^3$$ 3 He crystals at the temperature $$T = 0.41$$ T = 0.41 mK, supporting the existence of spin supercurrents in the melting/freezing waves on the crystal surface below the antiferromagnetic ordering temperature $$T_N= 0.93$$ T N = 0.93 mK, as predicted by Andreev. The spin currents that accompany such a melting-freezing wave make it a unique object, in which the inertial mass is distinctly different from the gravitational mass.

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Ultrathin two-dimensional Fe-doped cobaltous oxide as a piezoelectric enhancement mechanism in quartz crystal tuning fork (QCTF) photodetectors

Zhou

Chen

et al. 2021

Opt. Lett.

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An innovative ultrathin two-dimensional (2D) Fe-doped cobaltous oxide (Fe–CoO) coated quartz crystal tuning fork (QCTF) was introduced for the purpose of developing a low-cost photoelectric detector with a simple configuration. The enhancement mechanism of the piezoelectric signal in the ultrathin 2D Fe–CoO-coated QCTF detector is assumed to be the synergetic photocarrier transfer and photothermal effect of ultrathin 2D Fe–CoO. The ultrathin 2D nanosheet structure of Fe–CoO with a large specific surface area can efficiently absorb and convert light into heat in the QCTF, and the photocarrier transfer from the Fe–CoO nanosheet to the electrode of the QCTF contributes to the enhancement in electricity given the shortened diffusion distance of carriers to the surfaces of the 2D nanosheet. Finite element modeling was adopted to simulate the thermoelastic expansion and mechanical resonance of the QCTF with 2D Fe–CoO coating to support experimental results and analyses. Moreover, the effects of 2D Fe–CoO on the performance of QCTF-based photoelectric detectors were investigated. This Letter demonstrates that ultrathin 2D materials have great potential in applications such as costly and tiny QCTF detectors, light sensing, biomedical imaging, and spectroscopy.

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Quartz tuning fork as a probe of surface oscillations

Cited by 3 publications

References 21 publications

Quartz-tuning-fork enhanced photothermal spectroscopy for ultra-high sensitive trace gas detection

Quartz-tuning-fork enhanced photothermal spectroscopy for ultra-high sensitive trace gas detection

Evidence for Magnetic Crystallization Waves at the Surface of $$^3$$He Crystal

Ultrathin two-dimensional Fe-doped cobaltous oxide as a piezoelectric enhancement mechanism in quartz crystal tuning fork (QCTF) photodetectors

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