Controlling Nanowire Growth by Light.
Individual Au catalyst nanoparticles are used for selective laser-induced chemical vapor deposition of single germanium nanowires. Dark-field scattering reveals in real time the optical signatures of all key constituent growth processes. Growth is initially triggered by plasmonic absorption in the Au catalyst, while once nucleated the growing Ge nanowire supports magnetic and electric resonances that then dominate the laser interactions. This spectroscopic understanding allows real-time laser feedback that is crucial toward realizing the full potential of controlling nanomaterial growth by light.
NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge , Cambridge CB3 0HE, United Kingdom.
G Di
GD
Martino
Department of Engineering, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
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FB
Michaelis
NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge , Cambridge CB3 0HE, United Kingdom.|Department of Chemistry, University of Cambridge , Cambridge CB2 1EW, United Kingdom.
A R
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Salmon
Department of Engineering, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
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Hofmann
NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge , Cambridge CB3 0HE, United Kingdom.
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Baumberg
Catalysis; dark field spectroscopy; germanium nanowires; laser-induced chemical vapor deposition; magnetic resonances; plasmonics