BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Australia/Adelaide BEGIN:DAYLIGHT DTSTART:20221002T030000 TZOFFSETFROM:+0930 TZOFFSETTO:+1030 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=10 TZNAME:ACDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20230402T020000 TZOFFSETFROM:+1030 TZOFFSETTO:+0930 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=4 TZNAME:ACST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20221205T105621Z UID:4AB44515-0FDB-4BF7-B27A-5520F450B583 DTSTART;TZID=Australia/Adelaide:20221202T110000 DTEND;TZID=Australia/Adelaide:20221202T115500 DESCRIPTION:Metasurfaces are flat analogues of metamaterials\, they are art ificial composite materials made of resonant inclusions (also called meta- atoms) that are smaller than the wavelength of electromagnetic waves of in terest. If parameters of metasurfaces change in time\, such metasurfaces a re called parametric. Development of multifunctional devices based on para metric metasurfaces is a promising area of research. There is a range of a pproaches towards creating metasurfaces whose properties change in time: t hey can be tuned either electrically\, mechanically\, optically\, or therm ally. 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\, a s well as local access to individual meta-atoms.\n\nParametric metasurface s give us access to many non-trivial physical effects. They can shift the frequency of the radiation\, steer electromagnetic beams\, control paramet ric 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.\n\nIn this semin ar\, I will first show how the integration of metasurfaces with a micro-el ectro-mechanical system can improve spectrally tunable band-pass filters f or infrared imaging devices. Then I will present parametric metadevices ba sed on split-ring resonators with embedded varactor diodes that can be use d for amplification of electromagnetic waves in the microwave and subterah ertz frequency ranges.\n\nCo-sponsored by: Morteza Shahpari\n\nSpeaker(s): Mr Fedor Kovalev\, \n\nRoom: N218\, Bldg: Engineering North\, The Univers ity of Adelaide\, Adelaide\, South Australia\, Australia\, Virtual: https: //events.vtools.ieee.org/m/334124 LOCATION:Room: N218\, Bldg: Engineering North\, The University of Adelaide\ , Adelaide\, South Australia\, Australia\, Virtual: https://events.vtools. ieee.org/m/334124 ORGANIZER:morteza.shahpari@ieee.org SEQUENCE:3 SUMMARY:From tunable metasurfaces to parametric metadevices URL;VALUE=URI:https://events.vtools.ieee.org/m/334124 X-ALT-DESC:Description: <br /><p>Metasurfaces are flat analogues of metamat erials\, they are artificial composite materials made of resonant inclusio ns (also called meta-atoms) that are smaller than the wavelength of electr omagnetic 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 propert ies 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 meta surfaces. The choice of tuning technology depends on various features of t he metasurface design\, such as the required speed of modulation and mater ial compatibility\, as well as local access to individual meta-atoms.</p>\ n<p>Parametric metasurfaces give us access to many non-trivial physical ef fects. They can shift the frequency of the radiation\, steer electromagnet ic beams\, control parametric waves in the scattered field and exhibit non reciprocity\, meaning that electromagnetic waves are transmitted through t he metasurface differently depending on the direction of incidence. The hi gher the modulation rate\, the more interesting effects can be achieved in general. When it becomes comparable to the frequency of an electromagneti c wave\, it is possible to have complete control over light both in space and time.</p>\n<p>In this seminar\, I will first show how the integration of metasurfaces with a micro-electro-mechanical system can improve spectra lly tunable band-pass filters for infrared imaging devices. Then I will pr esent parametric metadevices based on split-ring resonators with embedded varactor diodes that can be used for amplification of electromagnetic wave s in the microwave and subterahertz frequency ranges.</p> END:VEVENT END:VCALENDAR