Search by tag «Bound States» 2 results

• ITMO Physicists Prove Feasibility of Non-Radiating States in Compact Acoustic Resonators: New Discovery Will Benefit Development of Acoustic Antennas and Sensors

  Researchers from ITMO University’s Faculty of Physics have succeeded in disproving a non-existence theorem which states that oscillations in open resonance systems must fade out by radiating energy into the surrounding medium. The physicists were able to calculate the shapes of acoustic resonators for which this theorem would not apply. In the resulting system, the energy of oscillations does not radiate into the surrounding space and remains within the resonator. Results of this research will facilitate the development of acoustic antennas and sensors.

  25.02.2022

• Physicists Discover New Way of Resonance Tuning for Nonlinear Optics

  A research team from ITMO University and the Australian National University has discovered that different metasurfaces exhibit the same behavior provided a symmetry breaking is introduced to their unit cells (“meta-atoms”). Asymmetry of meta-atoms results in high-quality (high Q) resonances in the transmittance spectra of metasurfaces. Such resonances are capable of multiple amplification of external signals. By manipulating the asymmetry, scientists were able to control the resonances and thus a metasurface’s optical response, which is highly desirable for practical applications. The results of this research were published in Physical Review Letters.

  14.11.2018