A universal and ultrasensitive vectorial nanomechanical sensor for imaging 2D force fields.

Area of Science:

• Nanotechnology
• Physics
• Materials Science

Background:

• Miniaturized force probes as nanomechanical oscillators allow ultrasensitive force investigations.
• Understanding the vectorial nature and topology of force fields is crucial for nanoscale measurements.

Purpose of the Study:

• To present an ultrasensitive method for imaging two-dimensional (2D) vectorial force fields.
• To demonstrate the capability of mapping tunable electrostatic force fields with high precision.

Main Methods:

• Utilizing optomechanically following the bidimensional Brownian motion of a singly clamped nanowire.
• Employing angular and spectral tomography of the nanowire's quasi-frequency-degenerated transverse mechanical polarizations.
• Observing shifts in eigenfrequencies and rotation of eigenmode orientation due to the force field.

Main Results:

• Successfully imaged 2D vectorial force fields with high sensitivity.
• Demonstrated attonewton variation sensitivity over the nanoprobe's Brownian trajectory.
• Mapped a tunable electrostatic force field where spatial gradients influenced nanowire properties.

Conclusions:

• The developed method provides a universal approach for vectorial force field imaging.
• This technique enables sensitive nanoscale scientific exploration by revealing force field characteristics.
• The method's sensitivity and applicability have a strong impact on nanoscale research.