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Direct electron beam writing of Bragg gratings in exciton polariton waveguides of organic dye nanofibers

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3 Author(s)
Takazawa, Ken ; National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan ; Mitsuishi, Kazutaka ; Inoue, J.-I.

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We develop a direct electron beam (EB) writing technique to fabricate Bragg gratings in organic dye nanofibers of thiacyanine that propagate exciton polaritons (EPs) along the fibers. The scanning electron beam with elaborately optimized parameters “bleaches” the nanofibers with a 100-nm-scale spatial resolution, leading to variation in the refractive index on that scale. We demonstrate that the fabricated Bragg gratings, with a period number N = 40 and a period length Λ ranging from 150 to 200 nm, reflect propagating exciton polaritons with a reflectance of up to ∼0.7.

Published in:

Applied Physics Letters  (Volume:99 ,  Issue: 25 )

Date of Publication:

Dec 2011

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