Abstract
During the last decade, new unusual physical phenomena have been discovered in studying the optics of dielectric mesoscale particles of an arbitrary three-dimensional shape with the Mie size parameter near 10 (q~10). The paper provides a brief overview of these phenomena from optics to terahertz, plasmonic and acoustic ranges. The different particle configurations (isolated, regular or Janus) are discussed, and the possible applications of such mesoscale structures are briefly reviewed herein in relation to the field enhancement, nanoparticle manipulation and super-resolution imaging. The number of interesting applications indicates the appearance of a new promising scientific direction in optics, terahertz and acoustic ranges, and plasmonics. This paper presents the authors’ approach to these problems.
Highlights
Mesoscale dielectric particles are mesostructures comprising both wavelength-scaled particles and particle chains or arrays
During the last decade, new unusual physical phenomena have been discovered in studying the optics of dielectric mesoscale particles of an arbitrary three-dimensional shape with the Mie size parameter near 10 (q~10)
The use of metamaterials for mesoscale particles provides new effects, for example, the photonic jet birefringence [26]. In this early research [26], we present the results of the photonic jet formation based on 2D photonic crystals (PhC) with the high-index (n = 3.32) dielectric cylindrical rods in air host medium
Summary
Mesoscale dielectric particles are mesostructures comprising both wavelength-scaled particles and particle chains or arrays. In the last decade, new, unusual phenomena have been discovered in optics of arbitrary three-dimensional dielectric particles at the mesoscale level and gratings with q~10 parameter. It is found that near-field optical vortices appear at points matching the symmetric quadrupole resonance and forward and back scattering Another interesting effect connected with the optical vortices is a possibility of threedimensional subwavelength confinement of light outside the dielectric particle with q~10 parameter, known as a photonic jet. This is associated with the vortex formation in the near field, namely the field squeeze due to the optical vortices occurring at the particle boundary, near the formation of the photonic jet [5]. TThheessee nneewwpphyhsyicsailcpahl epnhoemneonma aelnloawaelxlopwlaineixnpglsauicnhiningtesruescthinginetfefercetsstains gtheefffoercmtsa-as the f mtiaotnioonf tohfetphheoptohnoictojentiacnjdethaontsdpohtso.tspots
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