Opto-thermally Excited Fabry-Perot Resonance Frequency Behaviors of Clamped Circular Graphene Membrane

Shi, Fangcheng; Fan, Shangchun; Li, Cheng; Li, Ziang

doi:10.3390/nano9040563

Cited by 9 publications

(8 citation statements)

References 49 publications

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“…We study here only static configurations since any graphene membrane dynamics (with oscillation frequencies ranging between 10 to 100 MHz for probes of size of ∼ 1 µm [53,54]) is so much slower than the time-scale dictated by the electron mobility (∼ 1 THz) that it can be treated as adiabatic change of the geometry to which the electronic current adjusts immediately [29][30][31].…”

Section: Resultsmentioning

confidence: 99%

Graphene nanodrums as valleytronic devices

Ortíz¹,

Szpak²,

Stegmann³

2022

Preprint

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We investigate the electronic transport in graphene nanoelectromechanical resonators (GrNEMS), known also as graphene nanodrums or nanomembranes. We demonstrate that these devices, despite small values of out-of-plane strain, between 0.1 and 1%, can be used as efficient and robust valley polarizers and filters. Their working principle is based on the pseudomagnetic field generated by the strain of the graphene membrane. They work for ballistic electron beams as well as for strongly dispersed ones and can be also used as electron beam collimators due to the focusing effect of the pseudomagnetic field. We show additionally that the current flow can be estimated by semiclassical trajectories which represent a computationally efficient tool for predicting the functionality of the devices.

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Section: Resultsmentioning

confidence: 99%

Graphene nanodrums as valleytronic devices

Ortíz¹,

Szpak²,

Stegmann³

2022

Preprint

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“…It can be seen from Figure 6 b that the maximum displacement of the graphene sheet is within 2 nm, which is far less than its size. Moreover, it should be noted that the tension in graphene would change a lot when transferred to the ferrule substrate, and this tension could also be regulated artificially by electrical and optical methods [ 9 , 12 , 44 , 45 ]. In the present MD calculation, the pre-stress in graphene is set to be 1 GPa and 5 GPa.…”

Section: Resultsmentioning

confidence: 99%

Optical-Thermally Excited Graphene Resonant Mass Detection: A Molecular Dynamics Analysis

Xing

Fan

et al. 2021

Nanomaterials

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In consideration of the presented optical-thermally excited resonant mass detection scheme, molecular dynamics calculations are performed to investigate the thermal actuation and resonant mass sensing mechanism. The simulation results indicate that an extremely high temperature exists in a 6% central area of the graphene sheet exposed to the exciting laser. Therefore, constraining the laser driving power and enlarging the laser spot radius are essential to weaken the overheating in the middle of the graphene sheet, thus avoiding being burned through. Moreover, molecular dynamics calculations demonstrate a mass sensitivity of 214 kHz/zg for the graphene resonator with a pre-stress of 1 GPa. However, the adsorbed mass would degrade the resonant quality factor from 236 to 193. In comparison, the sensitivity and quality factor could rise by 1.3 and 4 times, respectively, for the graphene sheet with a pre-stress of 5 GPa, thus revealing the availability of enlarging pre-stress for better mass sensing performance.

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“…Laser vibration measurement technology is also widely used in the measurement of fused silica shell resonators [19][20][21], but no researcher has proposed the influence of the photothermal effect on resonance characteristics of fused silica micro hemispherical resonator (FS-MHR). According to existing research, it is quite common for the photothermal effect to cause changes in the characteristic frequency of MEMS devices, and research on the photothermal effect mainly focuses on its application in resonators, such as opto-thermal actuation [22][23][24], photonic thermometer [25], optical power meter [26], trace gas sensing [27], and so on, However, there is a lack of research on how the thermal effect caused by light in LDV test system affects the measurement accuracy of the resonant characteristics of micro-resonators.…”

Section: Introductionmentioning

confidence: 99%

The influence of photothermal effect on the resonance frequency of fused silica micro hemispherical resonator

Wang,

Hu,

Zheng

et al. 2023

Meas. Sci. Technol.

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Micro-electro mechanical system resonant gyroscope plays a more and more important role in inertial navigation. As a core sensing component of micro resonant gyroscope, fused silica micro hemispherical resonator (FS-MHR) is widely concerned because of its great performance potential. The resonance frequency is one of the important characteristic parameters of micro resonators, and laser vibration measurement technology is often used for high-precision measurement of this parameter. During the measurement process, it is inevitably affected by the interference of some light sources. To explore how light affects the resonance characteristics of FS-MHR, this paper establishes a relevant theoretical model; and verifies and analyzes the influence of the photothermal effect on the resonance characteristics of FS-MHR through simulation and experiment. Revealed the trend of temperature and resonance frequency changes over time under the same lighting conditions for uncoated and metal-coated films. The measured data shows that the resonance frequency of FS-MHR coated with the metal film is more susceptible to the influence of the photothermal effect. After 60 s of illumination, the resonance frequency will increase by 6.13 Hz, and frequency splitting will also cause a deviation fluctuation of 2.35 Hz under continuous illumination. This will introduce certain errors in the measurement results, and corresponding measures need to be taken to avoid interference from the light source.

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Opto-thermally Excited Fabry-Perot Resonance Frequency Behaviors of Clamped Circular Graphene Membrane

Cited by 9 publications

References 49 publications

Graphene nanodrums as valleytronic devices

Graphene nanodrums as valleytronic devices

Optical-Thermally Excited Graphene Resonant Mass Detection: A Molecular Dynamics Analysis

The influence of photothermal effect on the resonance frequency of fused silica micro hemispherical resonator

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