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Quantum interference of highly-dispersive surface plasmons

Tokpanov, Yury S. and Fakonas, James S. and Atwater, Harry A. (2016) Quantum interference of highly-dispersive surface plasmons. In: Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIV. Proceedings of SPIE. No.9921. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 99211P. ISBN 9781510602335. https://resolver.caltech.edu/CaltechAUTHORS:20180705-165201976

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Abstract

Previous experiments have shown that surface plasmon polaritons (SPPs) preserve their entangled state and do not cause measurable decoherence. However, essentially all of them were done using SPPs whose dispersion was in the linear “photon-like” regime. We report in this presentation on experiments showing how transition to “true-plasmon” non-linear dispersion regime, which occurs near SPP resonance frequency, will affect quantum coherent properties of light. To generate a polarization-entangled state we utilize type-I parametric down-conversion, occurring in a pair of non-linear crystals (BiBO), glued together and rotated by 90 degrees with respect to each other. For state projection measurements, we use a pair of polarizers and single-photon avalanche diode coincidence count detectors. We interpose a plasmonic hole array in the path of down-converted light before the polarizer. Without the hole array, we measure visibility V=99-100% and Bell’s number S=2.81±0.03. To study geometrical effects we fabricated plasmonic hole arrays (gold on optically polished glass) with elliptical holes (axes are 190nm and 240nm) using focused ion beam. When we put this sample in our system we measured the reduction of visibility V=86±5% using entangled light. However, measurement using classical light gave exactly the same visibility; hence, this reduction is caused only by the difference in transmission coefficients of different polarizations. As samples with non-linear dispersion we fabricated two-layer (a-Si - Au) and three-layer (a-Si – Au – a-Si) structures on optically polished glass with different pitches and circular holes. The results of measurements with these samples will be discussed along with the theoretical investigations.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2238282DOIArticle
ORCID:
AuthorORCID
Atwater, Harry A.0000-0001-9435-0201
Additional Information:© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE).
Series Name:Proceedings of SPIE
Issue or Number:9921
Record Number:CaltechAUTHORS:20180705-165201976
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180705-165201976
Official Citation:Yury S. Tokpanov, James S. Fakonas, Harry A. Atwater, "Quantum interference of highly-dispersive surface plasmons (Conference Presentation)", Proc. SPIE 9921, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIV, 99211P (9 November 2016); doi: 10.1117/12.2238282; https://doi.org/10.1117/12.2238282
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87580
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:06 Jul 2018 22:10
Last Modified:03 Oct 2019 19:57

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