Abstract
We report the possibility of generating tremendous light-field enhancements within shallow nano-trenches made in a high-index dielectric material because of resonant behaviors that are reminiscent of what we get with sub-wavelength plasmonic cavities. High quality factors are explained through a modal analysis which gives explicit design rules. The thin dielectric void gratings could be a relevant alternative to plasmon-based devices for chemical sensing, or could inspire novel efficient wavelength-selective photo-absorbers by taking poorly absorbing materials.
© 2019 Optical Society of America
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28 January 2019: A typographical correction was made to paragraph 1 of page 590.
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