Judy Martinez New laser microscopy method for ITMO scientists to simplify the study of materials at the nanoscale
Physicists from ITMO University have proposed a new method of laser microscopy based on the Raman effect. It will speed up and simplify the study of the composition of various substances at the nanoscale.
The article was published in a new journal Advanced Photonics Research international publishing house John Wiley & Sons… Various techniques of optical microscopy make it possible to visualize nanostructures and the processes occurring in them.
For example, you can find out how bonds in protein molecules are broken when heated, or how vital components of a cell, organelles, behave when exposed to light. For this, a powerful laser is shone on the object under study. It re-emits light at new frequencies, which is scattered and recorded by a special device – a spectrometer.
“In order to enhance the signal of a substance with a unique optical spectrum during microscopy, irradiation is carried out near optically resonant nanostructures. Our colleagues use metal probes to collect the scattered signal, which are located a few tens of nanometers from the structure. However, such a “near-field” technique is quite time consuming. It is also sensitive to mechanical vibrations, which limits the scope of its application, “says Sergei Makarov, a leading researcher at ITMO University’s New Physics and Technology Institute.
ITMO scientists have proposed a more convenient method for optical microscopy using Raman scattering. The spectral features and increased intensity of this effect can be used to analyze the properties of nanostructures or the chemical composition of compounds in a simpler and faster manner. “We took three silicon nanodisks and positioned them at an angle, due to which the electromagnetic field between the trained particles inside the ‘triangle’ was noticeably enhanced.
Raman scattering eliminates the need to keep the source close to silicon particles, such as a probe in near-field spectroscopy. And the accuracy of the study does not fall. By observing the change in the frequency of light, we can not only see where exactly the desired compound is located in space, but also determine its composition, ”explains Georgy Zograf, project manager, engineer at Novy Phystech.
The authors of the project noted that the results obtained were in agreement with theoretical calculations better than standard “near-field” optical microscopy. Scientists have taken many measurements from various nanostructures and polarizations to gain confidence in the effectiveness and versatility of the new method for further application.
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