Search by tag «Metasurface» 8 results

• Researchers Develop Nanostructure for Detection of Spiral Molecules via Twisted Light

  Scientists from ITMO University, Zhejiang University, and the Ioffe Institute have developed a metasurface capable of identifying the direction of the rotation of circular polarized light waves with a near-100% accuracy. Its artificial coating reflects leftward-spun light and allows rightward-spun light through. The structure is a mere several hundred nanometers thin, allowing it to be used even in the most advanced electronic devices. The technology should accelerate medical testing, simplify the detection of spiral molecules, such as DNA, and provide new prospects for experimental physics research. Results of the study have been published in Laser & Photonics Review.

  11.11.2024

• Researchers Propose New Multipolar Lattices for Improved Metasurfaces

  Scientists from ITMO University’s Faculty of Physics have predicted a unique type of bound states in the continuum – one that is completely resistant to changes in the system parameters. This would allow researchers to control the resonance properties of metasurfaces and, eventually, to develop more efficient optical and optoelectronic devices of the next generation. The corresponding paper received special recognition from the editors of Physical Review B (Letter) and was published in the section Editor’s Suggestion.

  20.07.2022

• ITMO Researchers Find a Way to Control Localized Light

  Scientists from ITMO University, the National University of Colombia, and the University of Siena have developed a metasurface with a unique structure and properties. The proposed solution makes it possible to generate surface waves with new characteristics, transfer them from point to point while maintaining their initial polarization, and therefore improve information communication. The relevant article is published in Physical Review X.

  19.08.2021

• Researchers Develop Material Capable of Being Transparent or Reflective in IR Spectrum

  Modern optical devices require constant tuning of their light interaction settings. Lenses need to change focus, lidars have to emit and receive light at different angles. For that purpose, there exist various mechanical apparatuses that shift lenses, rotate reflectors, and move emitters. But what if they all were to become unnecessary? An international research team that includes staff members of ITMO University and the University of Exeter have proposed a new metamaterial capable of changing its optical properties without any mechanical input. This development could result in a significant improvement in the reliability of complex optical devices while making them cheaper to manufacture. The study was featured on the cover of the May 2020 issue of Optica.

  25.05.2020

• ITMO University Researchers Develop ‘Smart Table’ for Wireless Charging at Record Distance

  Scientists from ITMO University have developed a prototype of a metasurface-based device that can be placed or embedded in a table in order to provide wireless charge to several gadgets at once. This “smart table” can wirelessly transmit energy without significant losses over the distance of a meter, which is hundreds of times more than the limit of existing wireless chargers. The researchers experimentally tested the device’s performance and described the physics behind it. The study was published in Physics Review Applied. 

  18.06.2019

• Researchers Discover New Nanoparticles with Exclusively Lateral Light Scattering

  An international team of physicists has produced first evidence of particles capable of scattering light in lateral direction by suppressing forward and backward scattering. The researchers studied the physics behind this phenomenon and confirmed their theoretical results with an experiment in the microwave spectral range, proving that lattices or metasurfaces made of these materials can be completely invisible. These results can be used in a variety of applications including light routing, binary-coded holograms, and sensors. The study was published in Physical Review Letters.

  11.06.2019

• 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

• New Non-Linear Metasurface Changes Basic Properties of Light

  An international research team has produced the first-ever dielectric metasurfaces for nonlinear light conversion. Using these structures, scientists have been able to convert infrared radiation into visible light. They have also been able to implement additional functions: an ability to deflect light at a specific angle and to change the light polarization. Kirill Koshelev, a researcher at the Nanophotonics and Metamaterials Laboratory and one of the study’s authors, spoke to ITMO.NEWS about the project and the significance of its results.

  15.06.2018