研究目的
Investigating the use of nanoscale stress combined with soft-clamping to realize exceptionally low mechanical dissipation in nanomechanical oscillators.
研究成果
The study demonstrates that geometric strain combined with soft-clamping can produce exceptionally high Q nanomechanical oscillators, capable of hundreds of coherent oscillations at room temperature, with Q factors as high as 800 million and Q × frequency products exceeding 1015 Hz.
研究不足
The study does not detail the specific limitations of the experimental setup or the potential areas for optimization in the strain engineering technique.
1：Experimental Design and Method Selection:
The study employs a non-uniform phononic crystal pattern to colocalize the strain and flexural motion of a free-standing Si3N4 nanobeam.
2：Sample Selection and Data Sources:
The samples are fabricated at the Center for MicroNanoTechnology (CMi) at EPFL.
3：List of Experimental Equipment and Materials:
The specific instruments and materials used are not detailed in the provided text.
4：Experimental Procedures and Operational Workflow:
Ringdown measurements at room temperature are conducted to assess the quality factors of the mechanical modes.
5：Data Analysis Methods:
The quality factors and frequencies of the mechanical modes are analyzed to evaluate the effectiveness of the strain engineering approach.
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