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.
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14 March 2016
Research Article|
March 14 2016
Experimental demonstration of the optical lattice resonance in arrays of Si nanoresonators Available to Purchase
Francisco J. Bezares
Jeffrey Owrutsky
a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
Appl. Phys. Lett. 108, 111101 (2016)
Article history
Received:
December 30 2015
Accepted:
February 26 2016
Citation
Stanislav TsoiFrancisco J. BezaresAlexander GilesJames P. LongOrest J. GlembockiJoshua D. CaldwellJeffrey Owrutsky; Experimental demonstration of the optical lattice resonance in arrays of Si nanoresonators. Appl. Phys. Lett. 14 March 2016; 108 (11): 111101. https://doi.org/10.1063/1.4943785
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