Ultralow loss torsion micropendula for chipscale gravimetry
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arXiv
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| Format: | Preprint |
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2024
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| author | Condos, C. A. Pratt, J. R. Manley, J. Agrawal, A. R. Schlamminger, S. Pluchar, C. M. Wilson, D. J. |
| author_facet | Condos, C. A. Pratt, J. R. Manley, J. Agrawal, A. R. Schlamminger, S. Pluchar, C. M. Wilson, D. J. |
| contents | We explore a new class of chipscale torsion pendula formed by Si$_3$N$_4$ nanoribbon suspensions. Owing to their unique hierarchy of gravitational, tensile, and elastic stiffness, the devices exhibit damping rates of $\sim 10\;μ$Hz and parametric gravity sensitivities near that of an ideal pendulum. The suspension nonlinearity can also be used to cancel the pendulum nonlinearity, paving the way towards fully isochronous, high $Q$ pendulum gravimeters. As a demonstration, we study a 0.1 mg, 32 Hz micropendulum with a damping rate of $16\;μ$Hz, a thermal acceleration sensitivity of $2\;\text{n}g/\sqrt{\text{Hz}}$, and a parametric gravity sensitivity of $5$ Hz/$g_0$. We record Allan deviations as low as 2.5 $μ$Hz at 100 seconds, corresponding to a bias stability of $5\times 10^{-7}g_0$. We also demonstrate a 100-fold cancellation of the pendulum nonlinearity. In addition to inertial sensing, our devices are well suited to proposed searches for new physics exploiting low-loss micro- to milligram-scale mechanical oscillators. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_04113 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ultralow loss torsion micropendula for chipscale gravimetry Condos, C. A. Pratt, J. R. Manley, J. Agrawal, A. R. Schlamminger, S. Pluchar, C. M. Wilson, D. J. Applied Physics Mesoscale and Nanoscale Physics Geophysics We explore a new class of chipscale torsion pendula formed by Si$_3$N$_4$ nanoribbon suspensions. Owing to their unique hierarchy of gravitational, tensile, and elastic stiffness, the devices exhibit damping rates of $\sim 10\;μ$Hz and parametric gravity sensitivities near that of an ideal pendulum. The suspension nonlinearity can also be used to cancel the pendulum nonlinearity, paving the way towards fully isochronous, high $Q$ pendulum gravimeters. As a demonstration, we study a 0.1 mg, 32 Hz micropendulum with a damping rate of $16\;μ$Hz, a thermal acceleration sensitivity of $2\;\text{n}g/\sqrt{\text{Hz}}$, and a parametric gravity sensitivity of $5$ Hz/$g_0$. We record Allan deviations as low as 2.5 $μ$Hz at 100 seconds, corresponding to a bias stability of $5\times 10^{-7}g_0$. We also demonstrate a 100-fold cancellation of the pendulum nonlinearity. In addition to inertial sensing, our devices are well suited to proposed searches for new physics exploiting low-loss micro- to milligram-scale mechanical oscillators. |
| title | Ultralow loss torsion micropendula for chipscale gravimetry |
| topic | Applied Physics Mesoscale and Nanoscale Physics Geophysics |
| url | https://arxiv.org/abs/2411.04113 |