NanophotonicStudies with Nanowires:
Nanowire Optical Waveguide & Nanowire Based Surface Enhanced Raman Spectroscopy
Ilsun Yoon
Department of Chemistry
Chungnam National University
Materials in the nanoscale have strong interactions with light compared to bulk materials.
Electromagnetic (EM) fields can be highly confined indielectric nanomaterials of high refractive indexes
andcan be strongly enhanced by plasmonic nanomaterials. Synthesis and fabrication of nanomaterials and
nanostructures developed in the recent 20 years lead explosive explorations instudies ofnew nanophotonic
materials like Qdots, nanowire lasers, nanofibers, and plasmonic nanomaterialsfortheir practical
applications in photonic devices, bio- and chemical-sensors, and energy harvesting.
In this talk, Iwill introduce my studies of near-field light-matter interactions ofdielectric and
plasmonic nanowires with their neighboring materialsand introduce my research interests to develop
novel nanophotonic devices and sensors:
(Nanowire Optical Waveguide)EM fieldsstrongly confined in the SnO2 nanowire (n ~ 2.1) can be
guided over 300 µm along nanowire.I will show how this guided field can be differently interacting with
neighboring nanomaterials of fluorescing dye, SnO2 nanowire, and Au nanoparticles.
(Nanowire-based Surface Enhanced Raman Scattering (SERS)) Raman scattering of molecules
adsorbed on plasmonic nanomaterials of Ag and Au can be extremelyincreasedby EM fields strongly
enhanced at the sharp edges and nanosized gaps ofthe nanomaterials. I will show how SERS
enhancements of plasmonic nanowires and their hybrid nanostructures can be increased sensitively to
their materials, structures, and excitation polarizations.