Strong Sub-Bandgap Absorption in GaSb/ErSb Nanocomposites Attributed to Plasma Resonances of Semimetallic ErSb Nanoparticles
Document Type
Article
Publication Date
6-30-2005
Identifier/URL
43030562 (Pure)
Abstract
We report experimental evidence for strong surface plasma resonances on semimetallic ErSb nanoparticles grown epitaxially in semiconducting GaSb by molecular beam epitaxy. The infrared transmission spectra of ErSb/GaSb superlattices grown by molecular beam epitaxy showed a pronounced attenuation peak below the band gap of GaSb, not observed in a GaSb epitaxial control layer containing no ErSb. We attribute the attenuation peak to a surface plasmon resonance on the ErSb particles. The position of this peak shifts to longer wavelengths with increased ErSb deposition, from 2.4 μm for the smallest deposition to 3.8 μm for the largest deposition. In addition, the attenuation strength increases with the total amount of ErSb contained in the sample. The strongest effective attenuation coefficient was measured to be 1.4×10 4 cm -1, which is nearly equal to the cross bandgap absorption of the bulk GaSb at 1 μm.
Repository Citation
Hanson, M. P.,
Driscoll, D. C.,
Brown, E. R.,
& Gossard, A. C.
(2005). Strong Sub-Bandgap Absorption in GaSb/ErSb Nanocomposites Attributed to Plasma Resonances of Semimetallic ErSb Nanoparticles. Physics of Semiconductors, 772 (1), 845-846.
https://corescholar.libraries.wright.edu/physics/1321
DOI
10.1063/1.1994370
