Abstract
Third-order nonlinear optical responses of a heterostructure composed of a planar thick silver film combined with a truncated all-dielectric photonic crystal are studied experimentally. Both open- and closed-aperture Z-scan measurements show a large nonlinear response within the metallic structure using a nanosecond laser. Compared with metal–dielectric photonic crystals with the same thickness of metal, the effective nonlinear optical response of heterostructure can be amplified nearly 3 times of the magnitude, due to the enhancement of fields in the metal under the tunneling mechanism. This configuration containing an isolated flat metal film has particular applications in reduced dimensions, such as surface sensor and microscopy.
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