[Physics-mmm] Solid State and Optics Seminar 2/28

[Paula Rhodaback]

Solid State and Optics Seminar
Wednesday 28 February
4:00 pm Weniger 304

Transparent conductive BaCuTeF thin films by pulsed laser deposition
Robert Kykyneshi
Abstract:
Transparent p-type carrier conductive BaCuTeF thin films are reported.
Undoped BaCuTeF films obtained in-situ by pulsed laser deposition in UHV
exhibit maximum conductivities of 50-55 S/cm on fused silica substrates.
The polycrystalline films deposited at various temperatures up to 600šC are
single phase with optical band gap of about 3 eV and 70% average
transparency in the visible and near-IR optical ranges.  BaCuTeF films
deposited on single crystal MgO substrates are highly oriented.

Thin film preparation of the p-type transparent semiconductor Cu3TaS4
Paul Newhouse

Coupling to nanoscale negative-refraction planar waveguides
Robyn Wangberg
Abstract:
Negative index non-magnetic strongly anisotropic waveguides have been shown
to
provide efficient beam steering and manipulation in nanoscale areas with
applications that include sub-diffraction planar lens imaging and photonic
funnels.  In this work we study the coupling to and from sub-wavelength
planar
waveguides of different sizes and compare the transmission through a
negative-index structure to the Bethe prediction for positive index
materials.
We simulate EM wave propagation and imaging in arbitrary waveguide
configurations with a focus on designing and optimizing planar-waveguide
based
beam-steering photonic devices.

Effective Non-Localities of Nano-Layered Meta-Materials
Justin Elser
Abstract:
Multi-layered nano-composites have been suggested for negative index of
refraction systems, photonic funnels, super- and hyper-lenses, as well as
other nanophotonic structures. We analyze the electromagnetic modes in such
systems and show that they are not described by conventional
effective-medium theories. We demonstrate the response of a majority of
realistic layered structures is strongly affected by effective
non-localities. We develop the analytical description of the relevant
phenomena and confirm our results with rigorous numerical solutions of the
Maxwell equations. Finally, we demonstrate that multi-layered plasmonic
nanostructures support high-index volume modes confined to deep
subwavelength areas by using the formalism we have developed.
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__________________________________________________________
David McIntyre                        email: mcintyre at onid.orst.edu   

Department of Physics           Tel: (541) 737-1696
Oregon State University              FAX: (541) 737-1683
Weniger Hall 301                     http://www.physics.orst.edu
Corvallis, OR 97331-6507
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