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Quantum Metaphotonics

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Technical Report,01 Oct 2012,01 Oct 2015

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University of Arizona Tucson United States

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Under the completed AFOSR grant we investigated the light-matter coupling between plasmonic nano-antennas and near-surface quantum confined structures. This included optimizing the MBE growth conditions of a near-surface quantum wells with emission around 1500nm and fabrication of arrays of various resonant antenna structures. Pump-probe spectroscopy was used to investigate the coupling effects, and a toy model was used to extract the coupling parameters. Utilizing antennas with a higher dipole moment, such as square patch antennas, is counteracted by the decrease in packing efficiency and the increase in the local density of optical states of these antennas and thus reducing the effective coupling. To move towards observing coupling between plasmonic nano-antennas and high quality quantum dots we investigated self-assembled MBE grown indium plasmonic nanostructures, or indium islands. Low densities of indium islands have been shown to increase the photoluminescence of an ensemble of InAs quantum dots. Indium islands have also been shown to be superconduting showing promise for possible superconducting plasmonics such as superconductorsemiconductor hybrid sources.

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