"The branch of technology that deals with dimensions and tolerances of 1 to 100 nanometres, or, generally, with the manipulation of individual atoms and molecules." - Oxford English Dictionary
Nanotechnology is an interdisciplinary field, drawing expertise from materials chemistry and engineering, biotechnology, mechanical engineering and electrical engineering, among other fields.
Array of 15 nanometer pores created by block co-polymer lithography at the California NanoSystems Institute, UCSB.
Atomic force microscope photo from Prof. Craig Hawker's research group.