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Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

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Frequency fluctuations in silicon nanoresonators.

Marc Sansa^1,2, Eric Sage^1,2, Elizabeth C Bullard³

¹Univ. Grenoble Alpes, F-38000 Grenoble, France.

Nature Nanotechnology

|March 2, 2016

Summary

Frequency stability in nanoresonators is limited by thermomechanical noise. This study reveals unexpected frequency fluctuations, significantly impacting nanoresonator performance and challenging current understanding.

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Area of Science:

Physics
Materials Science
Mechanical Engineering

Background:

Frequency stability is crucial for nanoresonator performance, theoretically limited by thermomechanical noise.
Mechanical frequency response fluctuations are theoretically interesting but experimentally challenging to detect.
Existing studies report frequency stability values far exceeding theoretical limits.

Purpose of the Study:

To investigate the discrepancy between theoretical limits and reported frequency stability in nanoresonators.
To experimentally demonstrate and characterize unexpected frequency fluctuations in a monocrystalline silicon nanoresonator.
To propose a new method for identifying and quantifying these fluctuations.

Main Methods:

Literature review of nanoresonator frequency stability studies.
Experimental investigation of a monocrystalline silicon nanoresonator at room temperature.
Development and application of a novel method to detect and measure frequency fluctuations.

Main Results:

All reviewed studies reported frequency stability values orders of magnitude higher than thermomechanical limits.
The studied silicon nanoresonator exhibited frequency fluctuations at an unexpectedly high level.
These fluctuations were confirmed to be intrinsic to the resonator, not from instrumentation or known sources.

Conclusions:

The presence of significant, previously uncharacterized frequency fluctuations impacts nanoresonator performance.
Current understanding of frequency stability in nanoresonators needs revision.
New experimental methods are required to accurately assess and mitigate these fluctuations.