INTERDISCIPLINARY PHYSICS - SCIENCE at the Edge
Pramod Sangi Reddy
Department of Mechanical Engineering
Department of Materials Science
University of Michigan, Ann Arbor
Charge
and
Energy
Transport
in Nanoscale
Junctions
Novel heat
dissipation and
transport phenomena
arise at
the nanoscale. In
this talk I
will describe results
from two
efforts in
our lab
aimed at
studying: 1)
the relationship between
the electronic structure
and heat
dissipation characteristics
of atomic
and molecular
junctions, and
2) novel radiative
heat transfer
phenomena that
arise between
objects separated
by nanometer
sized gaps. In order
to study
nanoscale heat
dissipation, we
nanofabricated novel
scanning probes
that enable direct
quantification of
heat dissipation
in atomic
and molecular
junctions. I
will describe,
in detail, how
these probes
were employed
to elucidate
asymmetric heat
dissipation characteristics
of atomic-scale
junctions. Next,
I will
present our
recent work
where we
have systematically studied
nanoscale heat
radiation via
a series
of technical
advances. Specifically, these advances
have enabled
detailed radiative
heat transfer
studies in
nanoscale gaps
between metal and
dielectric surfaces
in a
variety of
geometric configurations (e.g.
sphere-plate, tip-plate and plate-plate).
I will
also discuss
how dramatic
increases of
radiative heat
currents—orders of magnitudes
larger than
those predicted
by the
Stefan-Boltzmann law—were experimentally realized.
Finally,
I will
briefly outline
how these
advances can
be leveraged
for future investigations of
both nanoscale
radiative heat
transfer and
near-field based
thermophotovoltaic energy conversion.
Science at the Edge Seminar
11:30 a.m., Room 1400 BPS Bldg., Friday January 22, 2016
Shawna Prater / Secretary
Astrophysics Group
Michigan State University
567 Wilson Road, Room 3261
Biomedical Physical Sciences Bldg
East Lansing, MI 48824-2320
Ph: (517) 884-5601 Fax (517) 432-8802
[log in to unmask],
[log in to unmask]