Location: Spilker 232 (previously known as the Nano Building) Contact: ingrid@ee.stanford.edu Feb 25, 2013 4:15 PM, Spilker 232 (previously known as Nano Building) http://campus-map.stanford.edu/index.cfm?ID=04-040 - MapPhD Thesis Defense Department of Electrical Engineering Advisor: Prof. David A. B. MillerNanoscale Transverse Fabry-Perot ResonatorsKrishna Coimbatore BalramGinzton Laboratory Stanford University kcbalram@stanford.edu  The ability to fabricate multiple resonant photodetectors, each with separately engineered wavelength sensitivity, in a single-step process has many potential applications. In this talk, we propose and demonstrate the use of nanoscale semiconductor fin structures surrounded by metal as efficient transverse Fabry-Perot resonators which allow one to efficiently excite in-plane resonances under surface-normal incidence. We show that these devices support strong absorption resonances that can be tuned by varying the width of the structure and use this effect to engineer devices for two potential application areas. In the first half of the talk, we show how we can engineer nanoscale planar multispectral image sensors based on silicon fins surrounded by metallic slits wherein the resonant wavelength of each pixel is determined by the width of the silicon fin. The same metallic structure is used for both light confinement and carrier extraction in a compact metal-semiconductor-metal (MSM) geometry. We experimentally study how close we can put two of these pixels together and how small we can make an individual pixel. We show that, in principle, if the electrical properties of the devices are suitably controlled, one can engineer devices with a pixel pitch down to 250 nm and pixel sizes ~ 500 nm x 500 nm. In the second half of the talk, we use this effect to enhance the indirect absorption in germanium and engineer CMOS-compatible germanium photodetectors with high responsivity across the telecommunications bands (both C & L-bands). Finally, we show that this effect can be used to engineer novel resonant waveguide couplers that can be used to couple light efficiently from free space to both dielectric and plasmonic slot waveguides with slot widths on the order of 50 nm. Future Talks, Winter 2013:Feb 18, 2013 Presidents' Day Holiday - No Talk   Feb 25, 2013 Krishna Coimbatore Balram PhD Thesis Defense (David A. B. Miller, Advisor) "Nanoscale Planar Multispectral Image Sensors"   Mar 04, 2013 Nathalie de Leon Harvard University "Quantum Optics in the Solid State with Diamond Nanophotonics"   Mar 11, 2013 Professor Jennifer Dionne "Oh, The Places Plasmons Go!: Emergent Quantum and Magnetic Effects in Metal Nanoparticle Assemblies" Sponsor: Applied Physics Department, and Ginzton Laboratory Audience: Optics and Electronics SeminarFacebookTwitterEmailPrintAdd to CalendarFeb 25, 2013 4:15 PM, Spilker 232 (previously known as Nano Building) http://campus-map.stanford.edu/index.cfm?ID=04-040 - MapPhD Thesis Defense Department of Electrical Engineering Advisor: Prof. David A. B. MillerNanoscale Transverse Fabry-Perot ResonatorsKrishna Coimbatore BalramGinzton Laboratory Stanford University kcbalram@stanford.edu  The ability to fabricate multiple resonant photodetectors, each with separately engineered wavelength sensitivity, in a single-step process has many potential applications. In this talk, we propose and demonstrate the use of nanoscale semiconductor fin structures surrounded by metal as efficient transverse Fabry-Perot resonators which allow one to efficiently excite in-plane resonances under surface-normal incidence. We show that these devices support strong absorption resonances that can be tuned by varying the width of the structure and use this effect to engineer devices for two potential application areas. In the first half of the talk, we show how we can engineer nanoscale planar multispectral image sensors based on silicon fins surrounded by metallic slits wherein the resonant wavelength of each pixel is determined by the width of the silicon fin. The same metallic structure is used for both light confinement and carrier extraction in a compact metal-semiconductor-metal (MSM) geometry. We experimentally study how close we can put two of these pixels together and how small we can make an individual pixel. We show that, in principle, if the electrical properties of the devices are suitably controlled, one can engineer devices with a pixel pitch down to 250 nm and pixel sizes ~ 500 nm x 500 nm. In the second half of the talk, we use this effect to enhance the indirect absorption in germanium and engineer CMOS-compatible germanium photodetectors with high responsivity across the telecommunications bands (both C & L-bands). Finally, we show that this effect can be used to engineer novel resonant waveguide couplers that can be used to couple light efficiently from free space to both dielectric and plasmonic slot waveguides with slot widths on the order of 50 nm. Future Talks, Winter 2013:Feb 18, 2013 Presidents' Day Holiday - No Talk   Feb 25, 2013 Krishna Coimbatore Balram PhD Thesis Defense (David A. B. Miller, Advisor) "Nanoscale Planar Multispectral Image Sensors"   Mar 04, 2013 Nathalie de Leon Harvard University "Quantum Optics in the Solid State with Diamond Nanophotonics"   Mar 11, 2013 Professor Jennifer Dionne "Oh, The Places Plasmons Go!: Emergent Quantum and Magnetic Effects in Metal Nanoparticle Assemblies" When:Monday, February 25, 2013. 4:15 PM. Approximate duration of 1.0 hour(s). Where:Spilker 232 (previously known as the Nano Building) (Map) Sponsor:Applied Physics Department, and Ginzton Laboratory Contact:ingrid@ee.stanford.edu Admission:The Optics and Electronics Seminar Series is sponsored by  the Department of Applied Physics, and the E.L. Ginzton LaboratoryAudience:General Public, Faculty/Staff, Students, Alumni/FriendsTags:lecture, engineeringPermalink:http://events.stanford.edu/events/363/36303 More info...Last modified February 18, 2013. The Optics and Electronics Seminar Series is sponsored by