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arXiv · 1810.13369

On the giant enhancement of light in plasmonic or all-dielectric gratings comprising nano-voids

Jerome Le Perchec
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Abstract

We report the possibility to generate tremendous light-field enhancements within shallow nano-trenches made in a high index dielectric material, because of resonant behaviours reminiscent of what we get with sub-wavelength plasmonic cavities. The high quality factors are explained through a modal analysis and can be tuned with appropriate design rules. The thin dielectric void gratings here simulated could be a relevant alternative to plasmon-based devices for chemical sensing, or could be used as efficient wavelength-selective photo-absorbers by taking weakly absorbing materials.

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Jerome Le Perchec. 2018-10-31. On the giant enhancement of light in plasmonic or all-dielectric gratings comprising nano-voids. https://doi.org/10.1364/ol.44.000590

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