**** Reminder **** Ultrafast Dynamics of Charge Carriers in Laser Heated Metals

by Mr. Marat Spector

Bgu

at Condensed Matter Seminar

Mon, 29 Jun 2020, 11:30
Sacta-Rashi Building for Physics (54), room 207

Abstract

This seminar will be on Zoom *only* please see the details below.

Diffusion of heat in metals is a fundamental process which is crucial for a variety of applications of metal nanostructures. Surprisingly, however, ultrafast heat diffusion received only limited attention so far. Here, we show that heat diffusion can be made faster than e−ph energy transfer rate, in which case, it dominates the spatiotemporal dynamics of the temperature. This enables the metals to overcome the conventional limitations of the nonlinear optical response of materials; it can be simultaneously fast and strong. As a specific example, we identify the underlying (femtosecond and few picosecond) time scales responsible for the generation and erasure of optically induced transient Bragg gratings in thin metal films. Further, we show that heat diffusion gives rise to a significant nonlocal thermo-optic nonlinearity; it affects also the nonlinear optical response such that the overall change of the permittivity (hence, reflectivity of the transient grating) has a significant dependence also on the illumination period rather than only on the illumination intensity.

Dganit Meidan is inviting you to a scheduled Zoom meeting.

Topic: Marat Spector
Time: Jun 29, 2020 11:30 AM Jerusalem

Join Zoom Meeting
https://zoom.us/j/91099327344?pwd=akUxamNEVlRSR2g2UGRQbzdCME1tUT09

Meeting ID: 910 9932 7344
Password: 354472
One tap mobile
+97239786688,,91099327344# Israel
+972553301762,,91099327344# Israel

Dial by your location
+972 3 978 6688 Israel
+972 55 330 1762 Israel
+1 253 215 8782 US (Tacoma)
+1 301 715 8592 US (Germantown)
+1 312 626 6799 US (Chicago)
+1 346 248 7799 US (Houston)
+1 646 558 8656 US (New York)
+1 669 900 9128 US (San Jose)
Meeting ID: 910 9932 7344
Find your local number: https://zoom.us/u/abSKcdMzcW

Created on 22-06-2020 by Meidan, Dganit (dganit)
Updaded on 29-06-2020 by Meidan, Dganit (dganit)