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Corrugated SNOM probe with enhanced energy throughput

Antosiewicz T. J., Szoplik T.

Opto-Electronics Review

2008

Vol. 16, No. 4

451-457

In a previous paper we proposed a modification of metal-coated tapered-fibre aperture probes for scanning near-field optical microscopes (SNOMs). The modification consists in radial corrugations of the metal-dielectric interface oriented inward the core. Their purpose is to facilitate the excitation of surface plasmons, which increase the transport of energy beyond the cut-off diameter and radiate a quasi-dipolar field from the probe output rim. An increase in energy output allows for reduction of the apex diameter, which is the main factor determining the resolution of the microscope. In two-dimensional finite-difference time-domain (FDTD) simulations we analyse the performance of the new type of SNOM probe. We admit, however, that the two-dimensional approximation gives better results than expected from exact three-dimensional ones. Nevertheless, optimisation of enhanced energy throughput in corrugated probes should lead to at least twice better resolution with the same sensitivity of detectors available nowadays.

Energy transport in plasmon waveguides on chains of metal nanoplates

Saj W. M., Antosiewicz T. J., Pniewski J., Szoplik T.

Opto-Electronics Review

2006

Vol. 14, No. 3

243-251

An interest in energy transport in 3D chains of metal nanoparticles is oriented towards future applications in nanoscale optical devices. We consider plasmonic waveguides composed of silver nanoplates arranged in several geometries to find the one with the lowest attenuation. We investigate light propagation of 500-nm wavelength along different chains of silver nanoplates of subwavelength length and width and wavelength-size height. Energy transmission of the waveguides is analysed in the range of 400-2000 nm. We find that chain of short parallel nanoplates guides energy better than two electromagnetically coupled continuous stripes and all other considered nonparallel structures. In a wavelength range of 500-600 nm, this 2-µm long 3D waveguide transmits 39% of incident energy in a channel of λ x λ/2 cross section area.

A review of size and geometrical factors influencing resonant frequencies in metamaterials

Johnson N. P., Khokhar A. Z., Chong H. M., De La Rue R. M., Antosiewicz T. J., McMeekin S.

Opto-Electronics Review

2006

Vol. 14, No. 3

187-191

Although metamaterials and so-called left-handed media have originated from theoretical considerations, it is only by their practical fabrication and the measurement of their properties that they have gained credibility and can fulfil the potential of their predicted properties. In this review we consider some of the more generally applicable fabrication methods and changes in geometry as they have progressed, exhibiting resonant frequencies ranging from radio waves to the visible optical region.