Double-Gate Vectorial Frequency Control in Piezoresistive Nanowire Electromechanical Devices

Vacuum-gap and orthogonally aligned double-gate geometry is employed in a nanowire-based electromechanical resonator device to independently control two nearly degenerate orthogonal vibration modes. In the device, piezoresistance is the dominant mechanism of motion-induced conductance variation, which provides an efficient scheme for the self-transduction of vibrational motion into an electric signal. Two simultaneously applied gate voltages induce an opposite combined effect on the frequency shift between two vibration modes, which is well explained by model calculations. Using the opposite double-gate effect, we demonstrate vectorial control of two mode frequencies, which is not possible with single-gate geometry.

Automated summary

In this study, a nanowire-based electromechanical resonator device with vacuum-gap and orthogonally aligned double-gate geometry is used to independently control two nearly degenerate orthogonal vibration modes. The piezoresistance mechanism dominates the motion-induced conductance variation in the device, providing an efficient method for converting vibrational motion into an electric signal. By applying two gate voltages simultaneously, an opposite combined effect on the frequency shift between the two vibration modes is achieved, which is well explained by model calculations. This study demonstrates the vectorial control of two mode frequencies using the opposite double-gate effect, which is not possible with single-gate geometry.