Abstract
Large optical nonlinearities are critical to photonic technologies. The exploitation of nonlinear processes at low power levels, and in highly integrated formats, requires materials with large nonlinear susceptibilities in configurations that offer efficient nonlinear conversion. Metals have long been recognized as compelling candidates for nonlinear materials, as they possess nonlinear susceptibilities that are orders of magnitude larger than dielectric materials, and support surface plasmon modes that allow the light to become strongly confined and enhanced in deeply sub-wavelength volumes. Classical nonlocality[1] in conducting nanostructures has been shown to dramatically alter the linear optical response, for example placing a fundamental limit on the maximum field enhancement that can be achieved[2]. This limit directly extends to all nonlinear processes, which depend on field amplitudes.
© 2015 IEEE
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