Like drums in regular drumsets, graphene membranes at the nanoscale possess a distinct set of oscillating modes that correspond to specific oscillation frequencies. The modes can be excited by applying an external voltage.
A single drop with the volume of a millionth of a litre is really not very large and certainly does not look like something you can do a lot with. However, a simple device can split the microdroplet into a collection of equally-sized nanodroplets.
Researchers are one step closer to developing a new generation of low-cost, high-efficiency solar cells. The structure is one of the world's first examples of a tri-layer metasurface absorber using a carbon interlayer.