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DTSTAMP:20260815T205940Z
LAST-MODIFIED:20150211T145336Z
DTSTART:20150212T170000Z
DTEND:20150212T180000Z
UID:event1408@bu.edu
URL:http://physics.bu.edu/internal/events/show/1408
SUMMARY:Plasmonically Enhanced Chiral Fields and Forces
DESCRIPTION:Featuring Hossein Alizadeh\n\nPart of the Preliminary Oral Exam
	.\n\nExamining Committee: Bjoern Reinhard\, Shyam Erramilli\, Roberto Paiel
	la\, Kevin Black\n\nAbstract:\n\nThe two enantiomers (mirror-images) of a b
	iomolecule can drastically show different behaviors\, requiring the develop
	ment of sensitive approaches for their identification and separation. Plasm
	onic nanostructures have shown promise for enhancing the sensitivities of c
	hiral spectroscopies\, but the generation of chiral near fields with a spec
	ific handedness in the spatial domain surrounding the plasmonic structures 
	remains a challenge. Here we demonstrate that achiral bianisotropic structu
	res\, which couple the electric and magnetic fields\, can achieve high enha
	ncements of optical chirality in an extended spatial region. Magneto-electr
	ic coupling in such structures facilitates electrically excited magnetic re
	sonances in the near IR and optical regimes\, which in turn can result in h
	ighly enhanced optical chirality in an extended region of space. We apply t
	his concept to achiral double split ring resonators (DSRRs) and demonstrate
	 their potential in generating enhanced chiral fields and forces. Also\, th
	e behavior of optical chirality density gradient and chirality flux in such
	 structures is examined\, and it is shown that plasmonically generated chir
	al forces may pave the way to a new class of chiral biosensors. \n\n![Hosse
	in](/resources/event-image/1408/b050441_small)
LOCATION:PHO 936\, 8 Saint Mary's Street\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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