Exploring Photothermal Pathways via in Situ Laser Heating in the Transmission Electron Microscope: Recrystallization, Grain Growth, Phase Separation, and Dewetting in Ag0.5Ni0.5 Thin Films

A new optical delivery system has been developed for the (scanning) transmission electron microscope. Here we describe the in situ and “rapid ex situ” photothermal heating modality of the system, which delivers >200 mW of optical power from a fiber-coupled laser diode to a 3.7 μm radius spot on t...

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Published in:Microscopy and microanalysis 2018-12, Vol.24 (6), p.647-656
Main Authors: Wu, Yueying, Liu, Chenze, Moore, Thomas M., Magel, Gregory A., Garfinkel, David A., Camden, Jon P., Stanford, Michael G., Duscher, Gerd, Rack, Philip D.
Format: Article
Language:English
Subjects:
Continuous radiation
Drying
Experiments
Fiber lasers
Fiber optics
Grain growth
Laser beam heating
Lasers
Materials Science Applications
Organic chemistry
Phase separation
Pulse duration
Recrystallization
Semiconductor lasers
Software
Thermal stability
Thin films
Transmission electron microscopy
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container_end_page 656
container_issue 6
container_start_page 647
container_title Microscopy and microanalysis
container_volume 24
creator Wu, Yueying
Liu, Chenze
Moore, Thomas M.
Magel, Gregory A.
Garfinkel, David A.
Camden, Jon P.
Stanford, Michael G.
Duscher, Gerd
Rack, Philip D.
description A new optical delivery system has been developed for the (scanning) transmission electron microscope. Here we describe the in situ and “rapid ex situ” photothermal heating modality of the system, which delivers >200 mW of optical power from a fiber-coupled laser diode to a 3.7 μm radius spot on the sample. Selected thermal pathways can be accessed via judicious choices of the laser power, pulse width, number of pulses, and radial position. The long optical working distance mitigates any charging artifacts and tremendous thermal stability is observed in both pulsed and continuous wave conditions, notably, no drift correction is applied in any experiment. To demonstrate the optical delivery system’s capability, we explore the recrystallization, grain growth, phase separation, and solid state dewetting of a Ag0.5Ni0.5 film. Finally, we demonstrate that the structural and chemical aspects of the resulting dewetted films was assessed.
doi_str_mv 10.1017/S1431927618015465
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source Cambridge University Press
subjects Continuous radiation
Drying
Experiments
Fiber lasers
Fiber optics
Grain growth
Laser beam heating
Lasers
Materials Science Applications
Organic chemistry
Phase separation
Pulse duration
Recrystallization
Semiconductor lasers
Software
Thermal stability
Thin films
Transmission electron microscopy
title Exploring Photothermal Pathways via in Situ Laser Heating in the Transmission Electron Microscope: Recrystallization, Grain Growth, Phase Separation, and Dewetting in Ag0.5Ni0.5 Thin Films
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