Search: onr:"swepub:oai:DiVA.org:kth-143699" >
Optimized grating a...
Abstract
Subject headings
Close
- Lamellar gratings are investigated via temporal coupled-mode theory and numerical simulations. Total absorption can be achieved by an optimized grating with shallow grooves under normal incidence and the full width at half-maximum (FWHM) is only 0.4 nm. For certain wavelengths, the structure shows high absorption only within an ultra-narrow angle, which suggests that it can be used as a highly directional thermal emitter according to Kirchhoff's law. Besides, the resonant wavelength is sensitive to the refractive index of the environmental dielectric. The large sensitivity (1400 nm/RIU) and simultaneous small FWHM result in a huge figure-of-merit of 2300/RIU, which enables the structure to have great potential in plasmonic sensing.
Keyword
- Light-Absorption
- Thermal Sources
- Resonance
- Metals
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database