Ultralong phase-correlated networks of plasmonic nanoantennas coherently driven by photonic modes. (March 2021)

• Record Type: Journal Article
• Authors: Sadeghi, Seyed M.; Gutha, Rithvik R.
• Is Part Of: Applied materials today. Volume 22(2021)
• Publication Date: 2021-03
• Subjects: Materials science -- Periodicals; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1016/j.apmt.2020.100932
• Languages: English
• ISSNs: 2352-9407

Abstract

Highlights: Formation of coherent networks in disordered arrays of metallic nanoislands. Application of diffractive coupling and photonic lattice modes to drive plasmons. Experimental and numerical investigations of surface lattice resonances in arrays of nanoislands. Long range distribution of coherent properties using arrays of metallic nanoislands. Graphical abstract: Abstract: We study coherently-stimulated plasmonic dipoles and their phase-correlated coupling, offering ultralong coherent networks of metallic nanoantennas. This is done by considering Au nanoislands with random sizes and shapes placed in close vicinity of each other in a strip with long length and nanoscale width. The positions of the nanoislands in such a strip fluctuate, forming a one-dimensional disordered array. We demonstrate that once such a structure is periodically repeated such that the Rayleigh anomaly condition is satisfied, the photonic lattice modes can drive the plasmon modes of the nanoislands at frequencies dictated by such modes. This allows the nanoislands to act as nano-scale antennas that are excited in phase and are coupled to the neighboring nanoantennas coherently over distances far larger than the sizes of the individual nanoislands. Under these conditions the disordered array acts as a network wherein coherent specifications are distributed in scales far longer than those of the individual nanoislands.