We report a simple experiment to demonstrate optically-driven resonance on a macroscopic object. Utilising dynamic force microscopy in ambient environment, the resonant motion of a cm-sized cantilever driven by an amplitude-modulated diode laser is directly observed. Our versatile setup involves a host of exciting modern experimental techniques that are suitable in the undergraduate laboratory.

Copper Tubing-Flexible 1/4-inch cooper tubing used to form the transmitting and receiving coils can be found at most hardware stores. The cost is approximately $1 per foot. The 55-gallon industrial plastic drums that the copper tubing was wrapped around can also be found at many hardware stores and costs approximately $70. Miscellaneous-The WPT experiments also required 18-AWG magnet wire to form the transmitting and receiving loops, capacitors to set the resonant frequency of the loops, coaxial cables, and various rf connector adapters. All of these components can be purchased from Digi-Key Electronics (https://www.digikey.com/).