Probing confined phonon modes in individual CdSe nanoplatelets using surface-enhanced Raman scattering.


Type
Article
Change log
Authors
Sigle, Daniel O 
Hugall, James T 
Ithurria, Sandrine 
Dubertret, Benoit 
Baumberg, Jeremy J 
Abstract

The phonon modes of individual ultrathin CdSe nanoplatelets are investigated using surface-enhanced Raman scattering in a tightly confined plasmonic geometry. The surface-enhanced Raman scattering spectra, taken on single nanoplatelets sandwiched between a gold nanoparticle and a gold surface, reveal a phonon doublet arising from oscillations perpendicular to and within the platelet plane. The out-of-plane mode cannot be observed with conventional Raman spectroscopy. The resulting strong electric field enhancements and the field vector reorientation within such nanometer-sized plasmonic gaps reveal otherwise hidden information deep into the Brillouin zone illuminating the vibrational properties of ultrathin materials.

Description
Keywords
0306 Physical Chemistry (incl. Structural), 0912 Materials Engineering, Nanotechnology, Bioengineering
Journal Title
Phys Rev Lett
Conference Name
Journal ISSN
0031-9007
1079-7114
Volume Title
113
Publisher
American Physical Society (APS)
Sponsorship
Engineering and Physical Sciences Research Council (EP/G060649/1)
Engineering and Physical Sciences Research Council (EP/L027151/1)
European Research Council (320503)
EPSRC