BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Turkey BEGIN:DAYLIGHT DTSTART:20380119T061407 TZOFFSETFROM:+0300 TZOFFSETTO:+0300 RRULE:FREQ=YEARLY;BYDAY=3TU;BYMONTH=1 TZNAME:+03 END:DAYLIGHT BEGIN:STANDARD DTSTART:20160907T000000 TZOFFSETFROM:+0300 TZOFFSETTO:+0300 RRULE:FREQ=YEARLY;BYDAY=1WE;BYMONTH=9 TZNAME:+03 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20180503T000000Z UID:01ADBE4F-2733-45AF-878E-E61D03993D34 DTSTART;TZID=Turkey:20180105T133000 DTEND;TZID=Turkey:20180105T153000 DESCRIPTION:Speaker: Prof. Ekmel Özbay\, Nanotechnology Research Center\, Bilkent University\n\nTopic: "Metamaterial based nanobiosensors and nanoph otodetectors"\n\nLocation: Middle East Technical University\, Ankara\, Tur key\n\nAbstract: In this talk\, we will present how metamaterials can be u sed for nanobiosensors and nanophotodetector applications. Our results sho w that a plasmonic structure can be successfully applied to bio-sensing ap plications and extended to the detection of specific bacteria species. A h ighly tunable design for obtaining double resonance substrates to be used in Surface Enhanced Raman Spectroscopy will also be presented. Surface Enh anced Raman Scattering experiments are conducted to compare the enhancemen ts obtained from double resonance substrates to those obtained from single resonance gold truncated nano-cones. We will present a UV plasmonic anten na integrated metal semiconductor metal (MSM) photodetector based on GaN. We also report the design\, fabrication\, and measurement of a device comp rising a split ring resonator array on epitaxial graphene. We obtained res onance broadening and tuning of split ring resonators by utilizing an epit axial graphene transistor with transparent top-gate. Metallic split ring r esonator (SRR) structures are used in nanophotonics applications in order to localize and enhance incident electromagnetic field. Electrically contr ollable sheet carrier concentration of graphene provides a platform where the resonance of the SRRs fabricated on graphene can be tuned. The reflect ivity spectra of SRR arrays shift by applying gate voltage\, which modulat es the sheet carrier concentration\, and thereby the optical conductivity of monolayer graphene. We experimentally and numerically demonstrated that the tuning range can be increased by tailoring the effective mode area of the SRR and enhancing the interaction with graphene.\n\nBio: Prof. Dr. Ek mel Ozbay received M.S. and Ph. D. degrees from Stanford University in ele ctrical engineering\, in 1989 and 1992. He worked as a postdoctoral resear ch associate in Stanford University and he worked as a scientist in Iowa S tate University. He joined Bilkent University (Ankara\, Turkey) in 1995\, where he is currently a full professor in Physics Department and EEE Depar tment. In 2003\, he founded Bilkent University Nanotechnology Research Cen ter (NANOTAM) where he leads a research group working on nanophotonics\, n anometamaterials\, nanoelectronics\, GaN/AlGaN MOCVD growth\, and GaN base d devices. He is the 1997 recipient of the Adolph Lomb Medal of OSA and 20 05 European Union Descartes Science award. He worked as an editor for Natu re Scientific Reports\, Optics Letters\, PNFA\, and IEEE JQE journals. He has published 430+ articles in SCI journals. His papers have received 1350 0+ SCI citations with an SCI h-index of 55. He has given 145+ invited talk s in international conferences. He recently became the CEO of a spin-off c ompany: AB-MicroNano Inc.\n\nCo-sponsored by: URSI-TR\n\nSpeaker(s): Prof. Ekmel Özbay\, \n\nAnkara\, Ankara\, Türkiye LOCATION:Ankara\, Ankara\, Türkiye ORGANIZER:ozergul@metu.edu.tr SEQUENCE:0 SUMMARY:IEEE AP/MTT/EMC/ED TURKEY CHAPTER SEMINAR SERIES -- SEMINAR 22 URL;VALUE=URI:https://events.vtools.ieee.org/m/157225 X-ALT-DESC:Description: <br /><p>Speaker: Prof. Ekmel &Ouml\;zbay\, Nanotec hnology Research Center\, Bilkent University</p>\n<p>Topic: "Metamaterial based nanobiosensors and nanophotodetectors"</p>\n<p>Location:&nbsp\;Middl e East Technical University\, Ankara\, Turkey</p>\n<p><em>Abstract: In thi s talk\, we will present how metamaterials can be used for nanobiosensors and nanophotodetector applications. Our results show that a plasmonic stru cture can be successfully applied to bio-sensing applications and extended to the detection of specific bacteria species. A highly tunable design fo r obtaining double resonance substrates to be used in Surface Enhanced Ram an Spectroscopy will also be presented. Surface Enhanced Raman Scattering experiments are conducted to compare the enhancements obtained from double resonance substrates to those obtained from single resonance gold truncat ed nano-cones. We will present a UV plasmonic antenna integrated metal sem iconductor metal (MSM) photodetector based on GaN. We also report the desi gn\, fabrication\, and measurement of a device comprising a split ring res onator array on epitaxial graphene. We obtained resonance broadening and t uning of split ring resonators by utilizing an epitaxial graphene transist or with transparent top-gate. Metallic split ring resonator (SRR) structur es are used in nanophotonics applications in order to localize and enhance incident electromagnetic field. Electrically controllable sheet carrier c oncentration of graphene provides a platform where the resonance of the SR Rs fabricated on graphene can be tuned. The reflectivity spectra of SRR ar rays shift by applying gate voltage\, which modulates the sheet carrier co ncentration\, and thereby the optical conductivity of monolayer graphene. We experimentally and numerically demonstrated that the tuning range can b e increased by tailoring the effective mode area of the SRR and enhancing the interaction with graphene.</em></p>\n<p><em>Bio:&nbsp\;Prof. Dr. Ekmel Ozbay received M.S. and Ph. D. degrees from Stanford University in electr ical engineering\, in 1989 and 1992. He worked as a postdoctoral research associate in Stanford University and he worked as a scientist in Iowa Stat e University. He joined Bilkent University (Ankara\, Turkey) in 1995\, whe re he is currently a full professor in Physics Department and EEE Departme nt. In 2003\, he founded Bilkent University Nanotechnology Research Center (NANOTAM) where he leads a research group working on nanophotonics\, nano metamaterials\, nanoelectronics\, GaN/AlGaN MOCVD growth\, and GaN based d evices. He is the 1997 recipient of the Adolph Lomb Medal of OSA and 2005 European Union Descartes Science award. He worked as an editor for Nature Scientific Reports\, Optics Letters\, PNFA\, and IEEE JQE journals. He has published 430+ articles in SCI journals. His papers have received 13500+ SCI citations with an SCI h-index of 55. He has given 145+ invited talks i n international conferences. He recently became the CEO of a spin-off comp any: AB-MicroNano Inc.</em></p> END:VEVENT END:VCALENDAR