Utilizing sound waves to picture nanostructures

A cutaway of the ultrafast transmission electron microscope (UTEM) that RIKEN researchers used to picture ultrahigh-frequency sound waves in a skinny silicon plate. The laser one the left offers two beams, one (higher beam) that interacts with the electron beam (inexperienced) of the microscope and the opposite (decrease beam) illuminates the pattern. Credit score: RIKEN Middle for Emergent Matter Science

Researchers on the RIKEN Middle for Emergent Matter Science (CEMS) have demonstrated the potential of utilizing ultrafast transmission electron microscopy to measure sound waves in nanostructures. This breakthrough might result in a high-resolution imaging approach that makes use of ultrahigh-frequency sound waves to picture buildings on the nanometer scale.


Ultrasound is usually employed in medical settings to visualise inside organs and fetuses within the womb. The sound waves utilized in these functions sometimes have wavelengths of some millimeters, permitting them to picture buildings at that stage of measurement.

Nevertheless, physicists are involved in utilizing sound waves to picture supplies with nanoscale buildings, which require wavelengths of roughly 100 nanometers. The flexibility to detect small defects in these supplies will depend on the wavelength of the sound waves.

Of their analysis, the RIKEN physicists efficiently generated and detected ultrahigh-frequency sound waves utilizing an ultrafast transmission electron microscope (UTEM). This specialised microscope makes use of two laser beams, with a slight delay between them, to light up the pattern and generate ultrashort pulses of electrons. This setup allows the decision of very quick timescales.

By simulating the waves theoretically and evaluating them with experimental pictures, the researchers confirmed the accuracy of their strategy. The obtained pictures exceeded their expectations, permitting them to carry out Fourier-transform evaluation, a extensively used mathematical approach in analytics.

The staff plans to additional examine the applying of UTEM in learning ultrafast structural and magnetic dynamics in solids induced by nanoscale sound waves.

Extra data:
Asuka Nakamura et al, Characterizing an Optically Induced Sub-micrometer Gigahertz Acoustic Wave in a Silicon Skinny Plate, Nano Letters (2023). DOI: 10.1021/acs.nanolett.2c03938

Quotation:
Utilizing sound waves to picture nanostructures (2023, August 1)
retrieved 1 August 2023
from https://phys.org/information/2023-08-image-nanostructures.html

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