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All-optical modulation by plasmonic excitation of CdSe quantum dots

Pacifici, Domenico and Lezec, Henri J. and Atwater, Harry A. (2007) All-optical modulation by plasmonic excitation of CdSe quantum dots. Nature Photonics, 1 (7). pp. 402-406. ISSN 1749-4885. doi:10.1038/nphoton.2007.95.

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Photonics is a promising candidate technology for information processing, communication and data storage. Essential building blocks, such as logic elements and modulators, have been demonstrated. However, because of weak nonlinear light–matter interactions, these components typically require high power densities and large interaction volumes, limiting their application in dense chip-based integration. A solution may be found in surface plasmon polaritons (SPPs), guided electromagnetic waves that propagate with high field confinement along a metal–dielectric interface. We demonstrate an all-optical modulator in which efficient interaction between two light beams at different wavelengths is achieved by converting them into co-propagating SPPs interacting by means of a thin layer of CdSe quantum dots (QDs). The high SPP field confinement and high QD-absorption cross-section enable optical modulation at low power densities (~10^2 W cm^(-2)) in micrometre-scale planar devices.

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Atwater, Harry A.0000-0001-9435-0201
Additional Information:© 2007 Nature Publishing Group. Received 18 September 2006; accepted 11 May 2007; published 2 July 2007. The authors acknowledge financial support from AFOSR MURI No. FA9550-04-1-0434. Discussion and technical support from R. J. Walters, L. A. Sweatlock, T. Carmon, S. J. Kim and E. Marcora are also gratefully acknowledged.
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-04-1-0434
Issue or Number:7
Record Number:CaltechAUTHORS:20150317-154034913
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55865
Deposited By: Tony Diaz
Deposited On:18 Mar 2015 02:04
Last Modified:10 Nov 2021 20:51

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