Localizing and focusing second-harmonic emission with nonlinear metamaterials
2010
Recent research on second-harmonic generation in left-handed materials has shown a light localization mechanism
that originates from an all-angle phase-matching condition between counter-propagating electromagnetic modes
at fundamental and double frequencies. This phenomenon opens the route for the design of second-harmonic
lenses. In this paper, we recall the essential nonlinear properties needed to generate second harmonic images of
linear objects. We show that this approach enable one to realize SH images of objects placed inside or outside the
nonlinear lens. In the case of an external source, two distinct devices are proposed: a double lens configuration
which enables to image objects between symmetric metamaterial slabs, and a single lens case characterized by
an impedance mismatched interface. The versatility of these SH lenses opens new routes for the second harmonic
imaging technics since they are able to produce SH images from linear objects.
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