2024-05-21 オランダ・デルフト工科大学（TUDelft)
＜関連情報＞
- https://www.tudelft.nl/en/2024/me/news/strings-that-can-vibrate-forever-kind-of
- https://www.nature.com/articles/s41467-024-48183-7
低損失のセンチメートル・スケールのナノメカニカル共振器 Centimeter-scale nanomechanical resonators with low dissipation
Andrea Cupertino,Dongil Shin,Leo Guo,Peter G. Steeneken,Miguel A. Bessa & Richard A. Norte
Nature Communications Published:18 May 2024
DOI:https://doi.org/10.1038/s41467-024-48183-7
Abstract
High-aspect-ratio mechanical resonators are pivotal in precision sensing, from macroscopic gravitational wave detectors to nanoscale acoustics. However, fabrication challenges and high computational costs have limited the length-to-thickness ratio of these devices, leaving a largely unexplored regime in nano-engineering. We present nanomechanical resonators that extend centimeters in length yet retain nanometer thickness. We explore this expanded design space using an optimization approach which judiciously employs fast millimeter-scale simulations to steer the more computationally intensive centimeter-scale design optimization. By employing delicate nanofabrication techniques, our approach ensures high-yield realization, experimentally confirming room-temperature quality factors close to theoretical predictions. The synergy between nanofabrication, design optimization guided by machine learning, and precision engineering opens a solid-state path to room-temperature quality factors approaching 10 billion at kilohertz mechanical frequencies – comparable to the performance of leading cryogenic resonators and levitated nanospheres, even under significantly less stringent temperature and vacuum conditions.
