317 research outputs found
Electric and Magnetic Excitation of Coherent Magnetic Plasmon Waves in a One-dimensional Meta-chain
A one-dimensional diatomic meta-chain with equal-size holes and
different-length slits is designed. Broadband coherent magnetic plasmon waves
(MPW) are formed in such a system, excited by both the electric resonance in
the slits and the magnetic resonance in the holes in a wide range of incidence
angles (00-400) and broad frequency bands (200-230 THz). The dispersion
properties of the MPW measured in our experiments agree with the theoretical
calculation based on the Lagrange model. The coherent MPWs reported in this
paper may have applications in subwavelength integrated nanocircuits
Circuits with Light at Nanoscales: Optical Nanocircuits Inspired by Metamaterials
A form of optical circuitry is overviewed in which a tapestry of subwavelength nanometer-scale metamaterial structures and nanoparticles may provide a mechanism for tailoring, patterning, and manipulating local optical electric fields and electric displacement vectors in a subwavelength domain, leading to the possibility of optical information processing at the nanometer scale. By exploiting the optical properties of metamaterials, these nanoparticles may play the role of lumped nanocircuit elements such as nanoinductors, nanocapacitors, and nanoresistors, analogous to microelectronics. I show that this concept of metamaterial-inspired nanoelectronics ( metactronics ) can bring the tools and mathematical machinery of the circuit theory into optics, may link the fields of optics, electronics, plasmonics, and metamaterials, and may provide road maps to future innovations in nanoscale optical devices, components, and more intricate nanoscale metamaterials
Are negative index materials achievable with surface plasmon waveguides? A case study of three plasmonic geometries
We present a theoretical analysis of planar plasmonic waveguides
that support propagation of positive and negative index modes. Particular
attention is given to the modes sustained by metal-insulator-metal (MIM),
insulator-metal-insulator (IMI), and insulator-insulator-metal (IIM)
geometries at visible and near-infrared frequencies. We find that all three
plasmonic structures are characterized by negative indices over a finite
range of visible frequencies, with figures of merit approaching 20.
Moreover, using finite-difference time-domain simulations, we demonstrate
that visible-wavelength light propagating from free space into these
waveguides can exhibit negative refraction. Refractive index and figure-ofmerit
calculations are presented for Ag/GaP and Ag/Si3N_4 - based structures
with waveguide core dimensions ranging from 5 to 50 nm and excitation
wavelengths ranging from 350 nm to 850 nm. Our results provide the design
criteria for realization of broadband, visible-frequency negative index
materials and transformation-based optical elements for two-dimensional
guided waves. These geometries can serve as basic elements of threedimensional
negative-index metamaterials
Analytical solution for wave propagation through a graded index interface between a right-handed and a left-handed material
We have investigated the transmission and reflection properties of structures
incorporating left-handed materials with graded index of refraction. We present
an exact analytical solution to Helmholtz' equation for a graded index profile
changing according to a hyperbolic tangent function along the propagation
direction. We derive expressions for the field intensity along the graded index
structure, and we show excellent agreement between the analytical solution and
the corresponding results obtained by accurate numerical simulations. Our model
straightforwardly allows for arbitrary spectral dispersion.Comment: 7 pages, 3 figure
Parallel, Series, and Intermediate Interconnections of Optical Nanocircuit Elements Part 1: Analytical Solution
Following our recent development of the paradigm for extending the classic
concepts of circuit elements to the infrared and optical frequencies [N.
Engheta, A. Salandrino, A. Alu, Phys. Rev. Lett. 95, 095504 (2005)], in this
paper we investigate the possibility of connecting nanoparticles in series and
in parallel configurations, acting as nanocircuit elements, In particular, we
analyze a pair of conjoined half-cylinders, whose relatively simple geometry
may be studied and analyzed analytically. In this first part of the work, we
derive a closed-form quasi-static analytical solution of the boundary-value
problem associated with this geometry, which will be applied in Part II for a
nanocircuit and physical interpretation of these results.Comment: 21 pages, 5 figure
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