2023-03-22 オランダ・デルフト工科大学（TUDelft)
この技術は、光ではなく音波振動を使用するため、不透明な材料での高精度位置測定に役立ちます。
この技術は、地球の気候や人間の健康を監視するための新しい技術につながる可能性があります。この研究成果は、Nature Communicationsに掲載されました。
＜関連情報＞
- https://www.tudelft.nl/en/2023/tnw/new-microchip-links-two-nobel-prize-winning-techniques
- https://www.nature.com/articles/s41467-023-36953-8
機械式オーバートーン周波数コーム Mechanical overtone frequency combs
Matthijs H. J. de Jong,Adarsh Ganesan,Andrea Cupertino,Simon Gröblacher & Richard A. Norte
Nature Communications Published:16 March 2023
DOI:https://doi.org/10.1038/s41467-023-36953-8
Abstract
Mechanical frequency combs are poised to bring the applications and utility of optical frequency combs into the mechanical domain. So far, their main challenge has been strict requirements on drive frequencies and power, which complicate operation. We demonstrate a straightforward mechanism to create a frequency comb consisting of mechanical overtones (integer multiples) of a single eigenfrequency, by monolithically integrating a suspended dielectric membrane with a counter-propagating optical trap. The periodic optical field modulates the dielectrophoretic force on the membrane at the overtones of a membrane’s motion. These overtones share a fixed frequency and phase relation, and constitute a mechanical frequency comb. The periodic optical field also creates an optothermal parametric drive that requires no additional power or external frequency reference. This combination of effects results in an easy-to-use mechanical frequency comb platform that requires no precise alignment, no additional feedback or control electronics, and only uses a single, mW continuous wave laser beam. This highlights the overtone frequency comb as the straightforward future for applications in sensing, metrology and quantum acoustics.
