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Near-field Nanoscale Investigation of Optical Properties of Bi2Se3 Thin-films

Published online by Cambridge University Press:  06 September 2013

Sarah E. Grefe ,
Malinda Tan ,
Shahab Derakhshan  and
Yohannes Abate
Sarah E. Grefe
Affiliation:
California State University Long Beach, Department of Physics & Astronomy, 1250 Bellflower Blvd., Long Beach, CA 90840-9505, USA.
Malinda Tan
Affiliation:
California State University Long Beach, Department of Chemistry and Biochemistry, 1250 Bellflower Blvd., Long Beach, CA 90840-9507, USA.
Shahab Derakhshan
Affiliation:
California State University Long Beach, Department of Chemistry and Biochemistry, 1250 Bellflower Blvd., Long Beach, CA 90840-9507, USA.
Yohannes Abate
Affiliation:
California State University Long Beach, Department of Physics & Astronomy, 1250 Bellflower Blvd., Long Beach, CA 90840-9505, USA.
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Abstract

Bi2Se3 thin films are imaged in the near-field using spectroscopic scattering type near-field optical microscopy (s-SNOM) at mid infrared laser wavelength region (9-11μm). Single phases Bi2Se3 thin film structures were prepared by mechanical exfoliation on silicon wafers. We report size and wavelength dependent near-field interaction contrasts in both optical amplitude and phase. We show that near-field optical imaging allows material specific identification and characterization of Bi2Se3 exfoliated samples including the confirmation of residual tape presence or removal in stacked films. We describe an alternative “shear exfoliation” sample preparation method which reliably deposits Bi2Se3 without the possibility of adhesive contaminants.

Keywords

scanning probe microscopy (SPM)optical propertiesnanostructure
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1557: Symposium Y – Advances in Scanning Probe Microscopy for Imaging Functionality on the Nanoscale , 2013 , mrss13-1557-y03-08
Copyright
Copyright © Materials Research Society 2013 

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References

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