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Light programmable micro/nanomotors with optically tunable in-phase electric polarization
Zexi Liang1, Daniel Teal2, Donglei Emma Fan3,4
1Materials Science and Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712, USA.
Nature Communications
|November 23, 2019
Summary
Researchers developed semiconductor nanowires that instantly change direction and speed using light and electric fields. This breakthrough enables programmable nanoscale machines, like microscale stepper motors, for advanced applications.
Area of Science:
- Materials Science
- Nanotechnology
- Electrical Engineering
Background:
- Developing active nanomaterials for controlled mechanical motion is crucial for nanorobot realization.
- Semiconductor nanowires offer potential for responsive nanoscale devices.
Purpose of the Study:
- To present a versatile mechanism for controlling semiconductor nanowire alignment and speed using light and electric fields.
- To demonstrate the potential for light-induced nanoscale manipulation.
Main Methods:
- Utilized visible light exposure to alter the alignment direction and speed of semiconductor nanowires in an electric field.
- Employed theoretical analysis and simulation to understand the underlying working principle.
- Developed a microscale stepper motor based on the light-induced manipulation principle.
Main Results:
- Achieved instantaneous changes in nanowire alignment and speed.
- Demonstrated hundreds of repeatable light-induced alignment switching cycles.
- Programmed nanowire arrays to display Morse code, showcasing precise control.
- Created a microscale stepper motor capable of switching between in-phase and out-phase modes.
- Showcased independent operation of neighboring motors using patterned light.
Conclusions:
- The working principle is attributed to optically tuned electrical polarization of semiconductor nanowires.
- The developed manipulation principle enables novel micro/nanomachines with reconfigurable maneuverability.
- This research inspires the development of advanced micro/nanomachines for diverse applications.
