Enhanced nonlinear optical response of a planar thick metal film combined with a truncated photonic crystal

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 u...

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Bibliographic Details
Published in:Optics communications 2012-11, Vol.285 (24), p.5416-5419
Main Authors: Lu, Hai, Xue, Chun-Hua, Wu, Yong-Gang, Chen, Shu-Qi, Zhang, Xiao-Liang, Jiang, Hai-tao, Tian, Jian-Guo, Chen, Hong
Format: Article
Language:English
Subjects:
Effective nonlinear susceptibility
Interface mode
Nonlinear absorption
Photonic crystals
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Summary: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.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2012.07.095