MOSCOW, October 30. A rare optical phenomenon that makes it possible to develop spectrometers and lasers of a new generation, scientists from Samara University explained. The results were published in the journal Photonics.
An important property of oscillatory processes, including optical ones, is the “resonance quality factor,” which describes how quickly the oscillations decay: the higher the system quality factor, the slower they decay and the less energy loss, the researchers explained.
Special resonances that do not decay in time, that is, they have an infinite quality factor, they are called bound states in continuum (BCS).
Despite the fact that SSC is a mathematical abstraction, in practice structures with very high quality factor resonances, the so-called quasi-SSC, can be implemented, experts said. The difference between such systems is their extremely high functional characteristics.
Scientists of the Samara National Research University named after Academician S.P. Korolev developed a mathematical model that explains the formation of the SSC effect in cascade optical structures, also called light traps.
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“We have obtained explicit analytical conditions under which the existence of SSCs in resonant structures is possible. The proposed mathematical model is simple and effective; it allows one to explain and predict the occurrence of this effect,” said Nikita Golovastikov, associate professor of the Department of Technical Cybernetics at Samara University.
In optics and photonics, obtaining high-quality resonances, according to scientists, is the key to the development of compact resonators for advanced laser devices, as well as narrow-band optical filters for high-precision spectral analysis systems.
The use of SSC will make it possible, for example, to create high-precision chemical concentration sensors and a number of other spectral sensors, experts explained.
“The accuracy of our theoretical models is confirmed by the results of rigorous modeling based on the numerical solution of Maxwell’s equations,” noted Golovastikov.
On At this stage, the research team intends to generalize the developed models to describe the SSC in other structures and to study other resonant phenomena.
Samara University is a participant in the “Priority-2030” state support program for universities of the Russian Federation.