A team of researchers from Osaka University, Osaka Prefecture University, and Nagoya University used photoinduced force microscopy to map forces acting on quantum points in three dimensions. By eliminating noise sources, the team was able to achieve subnanomometer accuracy for the first time, which could lead to new advances in photocatalysts and optical chips, Technology.org reported.
The force field is not an invisible shield of sci-fi, but a set of vectors indicating the magnitude and direction of forces acting in a region of space. Nanotechnology, which deals with the fabrication and manipulation of tiny devices such as quantum dots, sometimes uses lasers to optically trap and move these objects. However, in order to analyze and manage such small systems, a better way is needed to visualize the 3D forces acting on them.
A research team from three Japanese universities has shown for the first time in the world how to create 3D force field diagrams with subnanomometer resolution by photoinduced force microscopy. “We were able to image the optical near field of the nanoparticles using a photoinduced field microscope. This measures the optical force caused by light radiation between the sample and the probe,” says Junsuke Yamanishi, the first author of the study.
laser light was directed to a quantum dot placed under a nuclear microscopic tip. Moving the point relative to the mountain allowed the microscope to map the 3D photoinduced force field. The team was able to achieve this high degree of accuracy with some experimental improvements. Ultra-vacuum conditions were created to increase the force sensitivity and heterodyne frequency modulation was used, which involves mixing two other frequencies to greatly reduce the effect of thermal heating. “With this unique technology, we have reduced the photothermal effect and achieved a resolution of less than a nanometer for the first time,” says Yasuhiro Sugawara, a leading researcher.
This research could be a fundamentally new technology in the design and evaluation of functional nanomaterials. In addition, it can help supplement the toolkit of scientists working with photocatalysts and optical functional devices, writes the University of Osaka news site.
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