Regensburg 2010 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 26: Poster Session
MM 26.29: Poster
Tuesday, March 23, 2010, 14:45–16:30, Poster C
Nanoantennae from high melting point transition metal nanowires — •Litty Varghese Thekkekara1, Andreas Erbe1, Diedrich A Schmidt2, Martina Havenith2, and Achim W Hassel1 — 1Max-Planck Institute für Eisenforschung,Düsseldorf — 2Lehrstuhl für Physikalische Chemie II, Ruhr University, Bochum
Due to their optical properties, nano metallic objects attract considerable attention in various fields of nanotechnology, such as thermal emitters, sensor applications, and analytical bioscience.
Here, nanowires were prepared by electrochemical etching from directionally solidified eutectic alloys (NiAlX, X =Mo, Re, W) and transferred to infrared-transparent substrates, mainly silicon.We have performed optical and morphological characterization of single, high melting point transition metal nanowires (rhenium, molybdenum and tungsten) with high aspect ratios and a thin protective oxide layer. Nanowire morphologies were confirmed using scanning electron microscopy as well as atomic force microscopy. The length of the wires is ~100μm,at a width of ~400nm.
Optical properties were measured using infrared micro spectroscopy. Small metal nanostructures with high aspect ratio do normally show a strong antenna-like longitudinal plasmon mode at a wavelength λ ~ 2L (L- length). Due to the length of the wires studied here, this mode is expected to be excited in the far infrared wavelength range.