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Publication Citation: A circular dielectric grating for vertical extraction of single quantum dot emission

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Author(s): Marcelo I. Davanco; Matthew T. Rakher; Dieter Schuh; Antonio Badolato; Kartik A. Srinivasan;
Title: A circular dielectric grating for vertical extraction of single quantum dot emission
Published: July 25, 2011
Abstract: We demonstrate a suspended circular grating composed of partially etched annular trenches in a thin GaAs membrane, designed for e±cient and moderately broadband ( approx. 5 nm) extraction of emission from single InAs quantum dots. Simulations indicate that a single dipole embedded in the center of the nanostructure radiates upwards into free space with a nearly Gaussian far-feld, allowing a collection e±ciency > 80% with a high numerical aperture (NA=0.7) optic, and with 12 times Purcell radiative rate enhancement. Fabricated devices exhibit a 10 % photon collection effciency with a NA=0.42 objective, a 20 times improvement over quantum dots in unpatterned GaAs. A fourfold reduction in quantum dot exciton lifetime is observed, suggesting moderate Purcell enhancement.
Citation: Applied Physics Letters
Volume: 99
Research Areas: Optics, Single Photon Sources, Nanotechnology, Physics
PDF version: PDF Document Click here to retrieve PDF version of paper (1MB)