From tunable metasurfaces to parametric metadevices
Metasurfaces are flat analogues of metamaterials, they are artificial composite materials made of resonant inclusions (also called meta-atoms) that are smaller than the wavelength of electromagnetic waves of interest. If parameters of metasurfaces change in time, such metasurfaces are called parametric. Development of multifunctional devices based on parametric metasurfaces is a promising area of research. There is a range of approaches towards creating metasurfaces whose properties change in time: they can be tuned either electrically, mechanically, optically, or thermally. Nonlinear mechanisms, as well as magnetic and chemical approaches, are also used to control the characteristics of metasurfaces. The choice of tuning technology depends on various features of the metasurface design, such as the required speed of modulation and material compatibility, as well as local access to individual meta-atoms.
Parametric metasurfaces give us access to many non-trivial physical effects. They can shift the frequency of the radiation, steer electromagnetic beams, control parametric waves in the scattered field and exhibit nonreciprocity, meaning that electromagnetic waves are transmitted through the metasurface differently depending on the direction of incidence. The higher the modulation rate, the more interesting effects can be achieved in general. When it becomes comparable to the frequency of an electromagnetic wave, it is possible to have complete control over light both in space and time.
In this seminar, I will first show how the integration of metasurfaces with a micro-electro-mechanical system can improve spectrally tunable band-pass filters for infrared imaging devices. Then I will present parametric metadevices based on split-ring resonators with embedded varactor diodes that can be used for amplification of electromagnetic waves in the microwave and subterahertz frequency ranges.
Date and Time
Location
Hosts
Registration
- Date: 02 Dec 2022
- Time: 11:00 AM to 11:55 AM
- All times are (UTC+10:30) Adelaide
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- The University of Adelaide
- Adelaide, South Australia
- Australia
- Building: Engineering North
- Room Number: N218
- Contact Event Host
- Co-sponsored by Morteza Shahpari
Speakers
Mr Fedor Kovalev of ANU
Biography:
Fedor Kovalev is a PhD student at the Research School of Physics of the Australian National University, a physicist and a microwave engineer with the strong background of the scientific work at various organizations of the Russian Academy of Sciences and space industry. He graduated from the National Research Technological University "MISiS" in Moscow (Russia) with a Master's degree in physics in 2020. His scientific project was based on one-year research at the Ilmenau University of Technology (Germany), supported by a DAAD scholarship and dedicated to subterahertz metamaterials for bolometric sensing. He has been involved in various scientific and technical projects since receiving an Engineer’s degree in Radio Physics and Electronics in 2013 and a Bachelor’s degree in Radio Engineering in 2011 at the National Research University “Moscow Power Engineering Institute” (Russia). The topic of his engineer’s diploma project was "Power addition of the spin transfer nano-oscillators in the presence of the structures of the metamaterials". Fedor Kovalev has good skills in advanced electromagnetic modeling and engineering. His research interests include tunable metasurfaces and parametric metadevices for microwave, terahertz and infrared communication, remote sensing, and imaging. As an engineer, Fedor Kovalev has developed microwave devices such as filters, diplexers, splitters, and couplers. In the last two years, before entering the Research School of Physics of the Australian National University, he worked on a preliminary design of ground terminals for satellite communication. He has extensive experience in link budget analysis and system design of transceivers for terrestrial satellite communication terminals.
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