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Hybrid gap modes induced by fiber taper waveguides: application in spectroscopy of single solid-state emitters deposited on thin films.



Marcelo I. Davanco, Kartik A. Srinivasan


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.
Optics Express


Nanophotonics and photonic crystals , quantum optics
Created May 24, 2010, Updated February 19, 2017