Achieving Ultrawide Tunability in Monolithically Fabricated Si Nanoresonator Devices

Area of Science:

• Materials Science
• Nanoscience
• Electrical Engineering

Background:

• Nanoresonators offer high performance in sensing and signal processing due to resonant vibrations.
• Tuning nanoresonator properties enhances effectiveness and enables new applications.
• Significant room-temperature tunability in conventional nanoresonators is a persistent challenge.

Purpose of the Study:

• To demonstrate ultrawide electrostatic tuning of resonance frequency in monolithically fabricated silicon nanoresonators.
• To achieve significant tunability at room temperature.
• To explore extreme electrostatic tuning of nonlinear behavior.

Main Methods:

• Fabrication of ultrathin silicon nanoresonators (40 nm width, 200 μm length).
• Application of electrostatic tuning to modify resonance frequency and nonlinear dynamics.
• Characterization of frequency tuning (∼70%) and nonlinear coefficient manipulation.

Main Results:

• Achieved ultrawide electrostatic tuning (∼70%) of resonance frequency at room temperature.
• Demonstrated a high tuning sensitivity (∼7% V⁻¹).
• Successfully canceled and flipped the sign of the cubic-nonlinear coefficient via electrostatic tuning.

Conclusions:

• The demonstrated nanoresonators exhibit remarkable operational flexibility and novel capabilities.
• These tunable devices are expected to benefit diverse technological areas, including sensing and quantum computation.
• The findings overcome challenges in achieving significant room-temperature tunability in microfabricated resonators.