Linear and nonlinear optical properties of Au-polymer metallodielectric Bragg stacks

Tammy K. Lee, Alan D. Bristow, Jens Hübner, Henry M. van Driel
2006 Journal of the Optical Society of America. B, Optical physics  
We demonstrate the fabrication of one-dimensional metallodielectric Bragg stacks (MDBSs) from 500 nm spincoated poly(methyl methacrylate) and 20 nm evaporated Au layers; one-, two-, and three-bilayer structures are achieved with good homogeneity (Ͻ2% thickness variation). The linear reflection and transmission spectra show very strong modulation relative to the constituent materials for only a few bilayers; transmission windows associated with sharp Bragg resonances are observed at ϳ600 and
more » ... nm, while other regions provide reflections of Ͼ90%. Nonlinear absorption was measured by a z-scan technique and is observed to be enhanced at the Bragg resonances. The ϳ600 nm peak of the three-bilayer MDBS is enhanced by approximately seven times compared to a single Au film. The wavelength dependence of the nonlinear enhancement can be correlated with the attenuation parameter. The experimental results are in good agreement with numerical simulations based on a transfer-matrix method employing the known physical and optical parameters. The MDBSs show strong potential as versatile and inexpensive components for optical devices.
doi:10.1364/josab.23.002142 fatcat:p3kvcoenujfqdmcbrl3rgj732q