Using a sharp metal tip to control the polarization and direction of emission from a quantum dot

http://www.nature.com/srep/2014/140924/srep06456/full/srep06456.html
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Links to Media http://www.nature.com/srep/2014/140924/srep06456/full/srep06456.html
Publication Type journal article
Creator Gerton, Jordan
Other Author Ghimire, A., Shafran, E., & Gerton, J. M.
Title Using a sharp metal tip to control the polarization and direction of emission from a quantum dot
Date 2014-01-01
Description Optical antennas can be used to manipulate the direction and polarization of radiation from an emitter. Usually, these metallic nanostructures utilize localized plasmon resonances to generate highly directional and strongly polarized emission, which is determined predominantly by the antenna geometry alone, and is thus not easily tuned. Here we show experimentally that the emission polarization can be manipulated using a simple, nonresonant scanning probe consisting of the sharp metallic tip of an atomic force microscope; finite element simulations reveal that the emission simultaneously becomes highly directional. Together, the measurements and simulations demonstrate that interference between light emitted directly into the far field with that elastically scattered from the tip apex in the near field is responsible for this control over polarization and directionality. Due to the relatively weak emitter-tip coupling, the tip must be positioned very precisely near the emitter, but this weak coupling also leads to highly tunable emission properties with a similar degree of polarization and directionality compared to resonant antennas.
Type InteractiveResource
Publisher Nature Publishing Group
Journal Title Scientific Reports
Volume 4
Issue 6456
First Page 1
Last Page 6
DOI doi:10.1038/srep06456
Language eng
Bibliographic Citation Ghimire, A., Shafran, E., & Gerton, J. M. (2014). Using a sharp metal tip to control the polarization and direction of emission from a quantum dot. Scientific Reports, 4, 6456, 1-6.
Rights Management (c) Nature Publishing Group ; Authors manuscript from Ghimire, A., Shafran, E., & Gerton, J. M. (2014). Using a sharp metal tip to control the polarization and direction of emission from a quantum dot. Scientific Reports, 4, 6456. doi:10.1038/srep06456 .
Format Medium application/html
Identifier uspace, 19315
ARK ark:/87278/s6b02f16
Setname ir_uspace
Date Created 2015-03-20
Date Modified 2015-03-23
ID 712879
Reference URL https://collections.lib.utah.edu/ark:/87278/s6b02f16
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