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Title: A nanowaveguide platform for collective atom-light interaction

We propose a nanowaveguide platform for collective atom-light interaction through evanescent field coupling. We have developed a 1 cm-long silicon nitride nanowaveguide can use evanescent fields to trap and probe an ensemble of {sup 87}Rb atoms. The waveguide has a sub-micrometer square mode area and was designed with tapers for high fiber-to-waveguide coupling efficiencies at near-infrared wavelengths (750 nm to 1100 nm). Inverse tapers in the platform adiabatically transfer a weakly guided mode of fiber-coupled light into a strongly guided mode with an evanescent field to trap atoms and then back to a weakly guided mode at the other end of the waveguide. The coupling loss is −1 dB per facet (∼80% coupling efficiency) at 760 nm and 1064 nm, which is estimated by a propagation loss measurement with waveguides of different lengths. The proposed platform has good thermal conductance and can guide high optical powers for trapping atoms in ultra-high vacuum. As an intermediate step, we have observed thermal atom absorption of the evanescent component of a nanowaveguide and have demonstrated the U-wire mirror magneto-optical trap that can transfer atoms to the proximity of the surface.
Authors:
;  [1] ; ;  [2]
  1. Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20742 (United States)
  2. Joint Quantum Institute, Department of Physics, University of Maryland and NIST, College Park, Maryland 20742 (United States)
Publication Date:
OSTI Identifier:
22489186
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; ATOMS; COUPLING; DESIGN; EFFICIENCY; FIBERS; LOSSES; MIRRORS; PROBES; RUBIDIUM 87; SILICON NITRIDES; SURFACES; TRAPPING; TRAPS; VISIBLE RADIATION; WAVEGUIDES; WIRES