Abstract
Plasmonic glasses composed of metallic inclusions in a host dielectric medium are investigated for their optical properties. Such structures characterized by short-range order can be easily fabricated using bottom-up, self-organization methods and may be utilized in a number of applications, thus, quantification of their properties is important. We show, using T-Matrix calculations of 1D, 2D, and 3D plasmonic glasses, that their plasmon resonance position oscillates as a function of the particle spacing yielding blue- and redshifts up to 0.3 eV in the visible range with respect to the single particle surface plasmon. Their properties are discussed in light of an analytical model of an average particle's polarizability that originates from a coupled dipole methodology.
Highlights
Top-down fabrication tools have enabled the study of surface plasmon resonances (SPRs) in complex nanostructures created with nanometer scale precision of shape and orientation [1]
An elegant example is the transition from a single metallic or metal-coated sphere, which exhibit a relatively simple localized SPR (LSPR), to a tunable band gap in synthetic opals assembled from such nanoparticles [7, 8]
Composite materials which are characterized by an amorphous distribution of metallic inclusions in a host matrix in the form of chains, planar arrays or 3D structures, exhibit a number of interesting optical properties
Summary
Top-down fabrication tools have enabled the study of surface plasmon resonances (SPRs) in complex nanostructures created with nanometer scale precision of shape and orientation [1]. Composite materials designed around a carefully tuned geometrical placement of constituent elements are usually susceptible to disorder which may, sometimes considerably, lower their efficiency Because of this various studies have addressed the effects of disorder in nanocomposites [13]. Ordered systems which generate coherent optical effects, are usually characterized by either narrow-band or narrow-angle operation [14], visible light absorption with an average efficiency of 94% using a patterned-metal/insulator/metal stack has been reported [15]. This above mentioned geometry is currently widely employed for designing perfect absorbers [16]. After the conclusions we provide appendices that give additional information on the derivation of the average polarizability of plasmonic glasses
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