Ultrafast Electron Microscope Built to See Events at the Nanoscale electron electrons electronmicroscopy microscopy NagoyaUniv NagoyaUniv_info
Experimental setup for transient EELS in the TR-TEM and the pump-probe system. The insets show enlarged schematic illustrations of the specimen position and a scanning transmission electron microscope image in the TR-TEM. Credit: Applied Physics Letters . DOI: 10.1063/5.0108266
Nanometrology, a branch of metrology, is used by researchers to quantify nanoparticles and is the measurement of length scales at the nanoscale. Researchers must evaluate events that take place in fractions of a second when particles are this tiny. Researchers collaborated with senior experts at Hitachi Hightech Ltd. to create an ultrafast electron microscope by fusing a general-purpose electron microscope with a semiconductor photocathode with a Nagoya University-invented “Negative Electron Affinity” surface. Events at the nanoscale can be watched using the resulting microscope developed by integrating these technologies. In Applied Physics Letters, the researchers reported the results of their study.
The ultrafast laser in the novel custom-built ultrafast electron microscope can be used to photoexcite plasmons in gold nanoparticles while enabling researchers to see single gold nanoparticles. Using their novel technique, the researchers analyzed two separate plasmon events. By understanding phenomena such as photoexcitation and relaxation processes and energy transport, we can improve photoresponsive properties and increase efficiency. In particular, it can be a powerful tool to capture individual time changes in small structural materials with spatial resolution . This has been difficult to achieve with conventional analytical methods using pulsed lasers as probes.
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