Nanoelectromechanical systems (NEMS) are mechanical structures and devices with critical dimensions at the nanometer scale—typically beams, cantilevers, or resonators—that couple mechanical motion to electronic or optical signals. NEMS extend microelectromechanical systems (MEMS) to smaller scales, achieving higher resonance frequencies, greater mass sensitivity, and quantum-limited motion. Applications include ultra-sensitive mass sensors for single-molecule detection, nanomechanical oscillators for timing and signal processing, and mechanical logic or memory. Fabrication typically uses top-down lithography and etching, or bottom-up assembly of nanostructures. The field spans fundamental physics—quantum optomechanics—and applied sensing and actuation.
MEMS have achieved widespread adoption in accelerometers, gyroscopes, and RF filters. NEMS promise further miniaturization and new capabilities: mass sensitivity at the attogram level, mechanical resonators in the gigahertz range, and potential quantum-coherent mechanical systems. Challenges include fabrication yield, environmental stability, and integration with readout electronics. Research continues into robust NEMS materials, hybrid mechanical-optical-electronic systems, and applications in biosensing, RF filtering, and quantum information. As fabrication techniques mature, NEMS could enable new classes of sensors and signal processors.