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|Author(s):||Marcelo I. Davanco; Kartik A. Srinivasan;|
|Title:||Hybrid gap modes induced by fiber taper waveguides: application in spectroscopy of single solid-state emitters deposited on thin films.|
|Published:||May 24, 2010|
|Abstract:||We show, via simulations, that an optical fiber taper waveguide may be an efficient spectroscopy tool for single emitters, such as single molecules or colloidal quantum dots, deposited on the surface of a thin dielectric membrane. The fiber-membrane system supports modes akin to those of a slotted dielectric waveguide, providing strong field confinement in the low index gap region, and leading to the potential for high spontaneous emission enhancement factors ( ≅ 20), fluorescence collection efficiencies ( ≅ 23%), and transmission extinction ( ≅ 20%) levels. A factor of two improvement in fluorescence and extinction levels is predicted if the membrane is instead replaced with a suspended channel waveguide. Two configurations, for operation in the visible ( ≅ 600 nm) and near-infrared ( ≅ 1300 nm) spectral ranges are evaluated, presenting similar performances.|
|Pages:||pp. 10995 - 11007|
|Keywords:||Nanophotonics and photonic crystals , quantum optics|
|Research Areas:||Optics, Nanophysics|
|PDF version:||Click here to retrieve PDF version of paper (572KB)|