Gerd Duscher¹, Chenze Liu¹, Yu-Chuan Lin², Yueying Wu³, Philip D Rack¹, Mathew F. Chisholm², Alexander A Pureztky², David B Geohegan²; ¹University of Tennesse, ²Oak Ridge National Laboratory, ³University of Tennessee

Laser processing in a transmission electron microscope (TEM) enables the continuous observation of crystallization of amorphous or nano-crystalline precursors from nucleation to materials far from equilibrium. The prototype system by Waviks, Inc. consists of laser diodes coupled to single mode optic fibers which function as a micromanipulator. Here we will report the growth of 2D materials on different substrates and synthesis of phase-separated bi-metallic nanoparticles.The beauty of the system is that synthesis can be observed in-situ with atomic resolution imaging, diffraction and/or EELS.This setup can also be used as a pump-probe system in which the photons excite states that then can be probed with the electron beam through monochromated EELS. In the case of a photonic nano-crystalline system the evanescent light field enhanced by a plasmon can then create stimulated emission and stimulated absorption of electrons, and thus allows to discriminate optical bright from dark plasmon modes.