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Experimental demonstration of the optical lattice resonance in arrays of Si nanoresonators
Ist Teil von
Applied physics letters, 2016-03, Vol.108 (11)
Ort / Verlag
Melville: American Institute of Physics
Erscheinungsjahr
2016
Quelle
American Institute of Physics (AIP) Journals
Beschreibungen/Notizen
Optical resonances of crystalline Si nanopillar arrays on a Si substrate are studied using optical reflectivity and Raman spectroscopy. When the nanopillars are arranged in a two-dimensional lattice, a collective resonance is observed in the reflection spectra which is absent for randomly distributed nanopillars. The resonance is due to coherent oscillations in nanopillars, can be tuned spectrally by the nanopillar diameter and lattice period, and strongly suppresses reflection from the Si surface. Raman scattering demonstrates that the reduced reflectivity is accompanied by increased electromagnetic field confined in Si, thus suggesting potential application of the lattice resonance in surface enhanced spectroscopy and thin film solar cells.