Segmented Bayesian optimization of meta-gratings for sub-wavelength light focusing
- 24 December 2019
- journal article
- research article
- Published by Optica Publishing Group in Journal of the Optical Society of America B
- Vol. 37 (1), 181-187
- https://doi.org/10.1364/josab.37.000181
Abstract
Using inverse design tools to engineer functional photonic nanostructures has been a subject of great interest over the past several years. We report combining a segmented Bayesian optimization algorithm with the rigorous coupled wave analysis to design meta-gratings for sub-wavelength light focusing. Specifically, the meta-gratings comprise one-dimensional periodic arrays of supercells, each of which consists of dozens of dielectric bars. By optimizing geometry of the structure, we demonstrate two kinds of meta-gratings operating at single and double wavelengths, respectively. Both of them can focus the incoming light into periodic sub-wavelength spots with high energy density. The full width at half-maximum (FWHM) of the focusing spots for the single wavelength ($\lambda = 633\,\,{\rm nm}$) case can be as small as $0.36\lambda $, while FWHMs of the focusing spots at double wavelengths ($\lambda = 533\,\,{\rm nm}$ and 633 nm) are about $0.4\lambda $. This proposed approach provides an affordable method to tackle the problem of complex photonic structure design.
Keywords
Funding Information
- Shenzhen Municipal Science and Technology Plan (JCYJ20180306172003963, JCYJ20170811154119292, GRCK20170822164729349)
- Natural Science Foundation of Guangdong Province (2015A030313748)
- China Postdoctoral Science Foundation (2018M630356)
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