Experimental verification of the rainbow trapping effect in adiabatic plasmonic gratings.
basic_science · Level V
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- Record sourced from PubMed, PMID 21402936.
- Also identified by DOI 10.1073/pnas.1014963108 and PMC identifier 3069179.
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Abstract
We report the experimental observation of a trapped rainbow in adiabatically graded metallic gratings, designed to validate theoretical predictions for this unique plasmonic structure. One-dimensional graded nanogratings were fabricated and their surface dispersion properties tailored by varying the grating groove depth, whose dimensions were confirmed by atomic force microscopy. Tunable plasmonic bandgaps were observed experimentally, and direct optical measurements on graded grating structures show that light of different wavelengths in the 500-700-nm region is "trapped" at different positions along the grating, consistent with computer simulations, thus verifying the "rainbow" trapping effect.
Medical subject headings
- Chemistry Techniques, Analytical
- Light
- Nanostructures