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The Effect of Viscous Air Damping on an Optically Actuated Multilayer MoS(2) Nanomechanical Resonator Using Fabry-Perot Interference
We demonstrated a multilayer molybdenum disulfide (MoS(2)) nanomechanical resonator by using optical Fabry-Perot (F-P) interferometric excitation and detection. The thin circular MoS(2) nanomembrane with an approximate 8-nm thickness was transferred onto the endface of a ferrule with an inner diamet...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5224651/ https://www.ncbi.nlm.nih.gov/pubmed/28335290 http://dx.doi.org/10.3390/nano6090162 |
Sumario: | We demonstrated a multilayer molybdenum disulfide (MoS(2)) nanomechanical resonator by using optical Fabry-Perot (F-P) interferometric excitation and detection. The thin circular MoS(2) nanomembrane with an approximate 8-nm thickness was transferred onto the endface of a ferrule with an inner diameter of 125 μm, which created a low finesse F-P interferometer with a cavity length of 39.92 μm. The effects of temperature and viscous air damping on resonance behavior of the resonator were investigated in the range of −10–80 °C. Along with the optomechanical behavior of the resonator in air, the measured resonance frequencies ranged from 36 kHz to 73 kHz with an extremely low inflection point at 20 °C, which conformed reasonably to those solved by previously obtained thermal expansion coefficients of MoS(2). Further, a maximum quality (Q) factor of 1.35 for the resonator was observed at 0 °C due to viscous dissipation, in relation to the lower Knudsen number of 0.0025~0.0034 in the tested temperature range. Moreover, measurements of Q factor revealed little dependence of Q on resonance frequency and temperature. These measurements shed light on the mechanisms behind viscous air damping in MoS(2), graphene, and other 2D resonators. |
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