Strong Coupling and Extreme Anisotropy in Infrared Polaritonic Media
- PC Department Online Seminar
- Date: Jan 24, 2022
- Time: 11:00 AM (Local Time Germany)
- Speaker: Dr. Joshua D. Caldwell
- Vanderbilt University, Nashville, Mechanical Engineering Dept.
Two predominant forms of polaritons, the plasmon and phonon polariton,
which are derived from light coupled with free carriers or polar optic
phonons, respectively, are broadly applied in the mid- to long-wave
infrared. However, the short scattering lifetimes of free-carriers results in high
losses and broad linewidths for the former, while the fast dispersion
and narrow band of operation for the latter result in significant
limitations for both forms. Here we will discuss the opportunity to
implement polaritonic strong coupling between different media in an
effort to dictate the polaritonic dispersion relation, and thus, the
propagation and resonant properties of these materials. Further, by
employing the extreme anisotropy of crystals ranging from
two-dimensional materials such as hexagonal boron nitride and transition
metal dichalcogenides to low-symmetry monoclinic to triclinic
materials, novel optical phenomena such as hyperbolicity and shear
polaritons are observed. The talk will highlight ultra-strong coupling
between both forms of polaritons in the context of infrared emitters, as
a means to control planar propagation using hyperbolic polaritons, an
modifying thermal dissipation at ultrafast time scales.
Join Zoom-Meeting
https://zoom.us/j/98588377600?pwd=R0tFSEdQQXEzWTBPTDljd1RacE5Ydz09
Meeting-ID: 985 8837 7600
Passcode: 970518