Laser-launched evanescent surface plasmon polariton field utilized as a direct coherent pumping source to generate emitted nonlinear four-wave mixing radiation

Hefei National Laboratory of Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China.
Optics Express (Impact Factor: 3.49). 03/2011; 19(6):4991–5001. DOI: 10.1364/OE.19.004991
Source: arXiv


We develop a concept of surface plasmon polaritons (SPPs) based four-wave
mixing (4WM), in which a laser-launched evanescent SPP field is utilized as a
coherent pumping source to involve directly in a nonlinear 4WM process at the
dielectric/metal interface. Conversion efficiency of the resulting 4WM
radiation is expected to be dramatically increased due to the local-field
enhancement effect. Feasibility of implementing this concept at the air/gold
film and graphene flake/gold film interfaces is further examined by numerical
simulations. The concept shows intriguing promise for applications in newly
emerging nanophotonics, optoelectronics, and active plasmonics.

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    ABSTRACT: The interaction of light with a metal mediated by surface plasmon polaritons provides for sub-diffraction limited optical confinement and control. While the relationship of the linear plasmon response to the underlying elementary electronic excitations of the metal is well understood in general, the corresponding ultrafast and nonlinear plasmon interactions could provide further enhanced functionalities. However, while the ultrafast and nonlinear optics of metals is an advanced field, the understanding of the related plasmonic properties is less developed. Here we discuss ultrafast and nonlinear wave-mixing properties of metals and metallic nanostructures in terms of the elementary optical interactions related to electronic band structure, plasmon resonances, and geometric selection rules. These properties form the fundamental basis of the nonlinear plasmonic light-matter interaction. The understanding of these fundamental properties, together with the ability to measure and control the typically fast femtosecond intrinsic and extrinsic dephasing times, is important for the development of applications such as enhanced nano-imaging, coherent control of individual quantum systems, strong light-matter interaction and extreme nonlinear optics, and nano-photonic devices.
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