Regensburg 2010 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 40: Plasmonics and nanooptics III

HL 40.9: Talk

Wednesday, March 24, 2010, 12:30–12:45, H32

Temperature related nanoantenna extinction in infrared range — •Chung Hoang, Frank Neubrech, Makus Klevenz, Robert Lovrincic, Olaf Skibbe, and Annemarie Pucci — Kirchhoff-Institut für Physik der Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg

We present important progress in the experimental studies of single-crystalline lead nanorods grown on Si(557) vicinal surfaces by self-assembling process in ultra-high vacuum. The growth of such nanorod arrays is governed by four experimental parameters: substrate temperature, surface energy, deposition rate, and amount of deposited lead. Upon cooling, strong enhancement of the infrared signal at resonance is observed, indicating the increase of extinction-cross section. This scenario can be attributed to the reduction of electron scattering events where electron - phonon scattering is the main factor that is involved in this process. Below half of the Debye temperature, the maximum resonant antenna extinction is nearly temperature independent, indicating residual electron scattering at surfaces.