Anomalous polariton dynamics in LiTaO3 polariton dynamics in LiTaO3

Gary P. Wiederrecht Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA

Thomas P. Dougherty Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA

Lisa Dhar Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA

Keith A. Nelson Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA

D. E. Leaird

A. M. Weiner School of Electrical Engineering, Purdue University, West Lafayette, IN

The techniques of single and multiple-pulse impulsive stimulated Raman scattering (ISRS) are used to explore the dynamics of the lowest frequency A1 polariton mode in the ferroelectric crystal lithium tantalate. This time-domain technique which allows unambiguous characterization of the frequency and damping dispersion of the polariton reveals anomalously high damping rates for the A1 mode. The damping behavior is explained by a model that includes coupling of the polariton to a weakly Raman-active relaxational mode and to two E-symmetry modes.

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School of Electrical Engineering, Purdue University, West Lafayette, IN

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Anomalous polariton dynamics in LiTaO3 polariton dynamics in LiTaO3

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Anomalous polariton dynamics in LiTaO3 polariton dynamics in LiTaO3

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