2011/10/14 by S. R. K. Rodríguez, O. T. A. Janssen, Rodriguez, S. R. K. +12
Engineering · Physics and Astronomy · #FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Optics (physics.optics) #Photonic Crystals and Applications #Plasmonic and Surface Plasmon Research #Thermal Radiation and Cooling Technologies
paper · pdf · doi:10.48550/arxiv.1110.3260
openalex publication_date 2011/10/14 · openalex created_date 2022/08/28 · openalex updated_date 2026/07/28
By tuning the radiative coupling of localized surface plasmons to diffracted\norders, we demonstrate how stop-gaps in plasmonic crystals of nanorods may be\nopened and tuned. The stop-gap arises from the mutual coupling of surface\nlattice resonances (SLRs), which are collective resonances associated with\ncounter-propagating surface polaritons. We present experimental results for\nthree different nanorod arrays, where we show how the dispersion of SLRs can be\ncontrolled by modifying the size of the rods. Combining experiments with\nnumerical simulations, we show how the properties of the stop-gap can be\ntailored by tuning a single structural factor. We find that the central\nfrequency of the stop-gap falls quadratically, the frequency width of the\nstop-gap rises linearly, and the in-plane momentum width of the standing waves\nrises quadratically, as the width of the nanorods increases. These\nrelationships hold for a broad range of nanorod widths, including duty cycles\nof the array between 20% to 80%. We discuss the physics in terms of a coupled\noscillator analog, which relates the tunability of the stop-gaps to the\ncoupling strength of plasmonic modes.\n