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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260812T023312Z
LAST-MODIFIED:20190206T141653Z
DTSTART:20190208T170000Z
DTEND:20190208T180000Z
UID:event2071@bu.edu
URL:http://physics.bu.edu/internal/events/show/2071
SUMMARY:Exciting bulk topological modes in photonic graphene
DESCRIPTION:Featuring Adrian Menssen\, University of Oxford\nHosted by: Cla
	udio Chamon\n\nPart of the Biophysics/Condensed Matter Seminar Series.\n\nT
	opological photonics sheds light on some of the surprising phenomena seen i
	n condensed matter physics that arise with the appearance of topological in
	variants. Optical waveguides provide a well-controlled platform to investig
	ate effects that relate to different topological phases of matter\, providi
	ng insight into phenomena such as topological insulators by direct simulati
	on of the states that are protected by the topology of the system. Previous
	 work has largely focussed on the investigation of states that appear at th
	e edge of domains which have different topological invariants.  Here\, we o
	bserve a mode associated with a topological defect in the bulk of a 2+1D ph
	otonic material by introducing a vortex distortion to an hexagonal lattice 
	and analogous to graphene. Our photonic crystal is fabricated by writing wa
	veguides in a glass substrate with a femtosecond laser using adaptive optic
	s aberration correction. In order to excite the topological mode\, we devel
	oped a method based on a SLM (Spatial Light Modulator) to simultaneously il
	luminate multiple waveguides. This allows us to excite an optical mode cons
	isting of more than a dozen waveguides with beams of independently controll
	ed phase\, amplitude and mode-shape.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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