[Todos] Coloquios del Departamento de Física (hoy viernes 11hs)

[pdmitruk en df.uba.ar]

Recordamos el coloquio extra de hoy,


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                        COLOQUIOS DEL DEPARTAMENTO DE FÍSICA FCEyN - UBA

                               http://coloquios.df.uba.ar/

                                 Charla, café y galletitas
                       En el Aula Federman, 1er piso, Pabellón I,
                                  Ciudad Universitaria

                                  COLOQUIO EXTRA

                          Viernes 17 de diciembre, 11 hs


             Photonic band gap materials: light trapping crystals


                                Sajeev John

           Department of Physics, University of Toronto, Canada


Photonic band gap (PBG) materials are artificial periodic dielectric
microstructures capable of trapping light in three-dimensions on
sub-wavelength scales without absorption loss. This offers new
opportunities for efficient solar energy trapping and harvesting in
suitably microstructured thin films. It also enables virtually
complete control of the flow of light on microscopic scales in a 3D
optical chip as well as very strong coupling of light to matter where
desired. By further engineering the electromagnetic density of states
within the chip it is possible to realize unprecedented coherent
optical control of the quantum state of resonant atoms or quantum
dots. This defines a fundamentally new strong-coupling regime for
quantum optics. It enables multiple-wavelength channel optical logic
to be performed on a chip on picosecond time scales at microwatt power
levels. I discuss further consequences of light trapping in classical
and quantum electrodynamics. I also discuss the challenges and
requirements for materials fabrication to realize these remarkable
effects.