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

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.

References in corpus (2)

• Why metallic surfaces with grooves a few nanometers deep and wide may strongly absorb visible light
• Are slot and sub-wavelength grating waveguides better than strip waveguides for sensing?

Cited by in corpus (2)

• Absorbance Enhancement of Monolayer MoS${}_2$ in a Perfect Absorbing System
• Light enhancement on thin and ultra-thin high-index dielectric slabs with rectangular nano-pits