Optical Spectroscopy Integrated with Environmental Scanning Transmission Electron Microscopy: a Comprehensive In Situ Characterization platform

M. Picher, S. Mazzucco, S. Blankenship, G. Holland, R. Sharma
National Institute of Standards and Technology, US

Keywords: coupling of spectroscopy and microscopy, in situ, Raman spectroscopy, environmental high resolution transmission electron microscope, nanoscaled proccesses

Summary:

Here, we present a unique instrument allowing the collection of Raman data during high-resolution environmental high resolution transmission electron microscope observation. Such coupled measurements are made possible thanks to the insertion of a parabolic mirror in between the sample holder and the lower pole piece of the microscope. The mirror focuses the incoming laser on the sample and collects the scattered Raman photons. This new platform enables us to combine and compare the structural information and kinetics from micrometer-scale areas obtained by Raman spectroscopy with the local information collected by the ETEM at the atomic scale. Moreover, this versatile optical setup can be used i) to simultaneously monitor the temperature of the probed material, ii) to investigate light/matter interactions iii) as a heating source: the sample can be heated up to 1000°C at 25 mW with a 532 nm laser, iv) for general spectroscopy (photoluminescence, cathodoluminescence, etc.). Detailed design, functioning, capabilities and application to carbon nanotube growth study will be presented.