A new far-field optical microscopy capable of reaching nanometer-scale resolution is developed using the in-plane image magnification by surface plasmon polaritons. This approach is based on the optical properties of a metal-dielectric interface that may provide extremely large values of the effective refractive index neff up to 10(3) as seen by surface polaritons, and thus the diffraction limited resolution can reach nanometer-scale values of lambda/2neff. The experimental realization of the microscope has demonstrated the optical resolution better than 60 nm at 515 nm illumination wavelength.
"Various elements such as plasmonic waveguides , subwavelength resonators  and optical nanoantennas  have been studied recently. Plasmons have been explored for their potential in a single molecule detection , biomolecular interaction studies , early stage cancer detection , transmissions through the subwavelength apertures , subwavelength imaging  etc. "
[Show abstract][Hide abstract] ABSTRACT: This paper presents an accurate study of plasmon hybridization in assemblies of coupled metal nanowires. Our modeling provides results in terms of eigenfrequencies and quality factors. For this eigenvalue problem that follows from Maxwell's equations has been solved. Possibility of quality factor enhancement in optimized assemble configurations has been demonstrated.
The 2014 IEEE International Symposium on Antennas and Propagation, Memphis, TN, USA; 06/2014
"Most often, the benefit of plasmonics is based upon the ability to confine EM fields into smaller volumes than those achievable by traditional focusing methods, such as dielectric lenses , . This underpins possible applications such as improved spatial-resolution imaging , , enhanced EM energy collection (e.g., in photovoltaics) , –, and improved nonlinear devices such as lasers –. "
[Show abstract][Hide abstract] ABSTRACT: In this paper, we present a review of experimental studies of terahertz plasmonic transmission properties through subwavelength holes patterned in conducting films. The frequency-dependent transmission spectrum reveals resonant behavior with an anomalously high peak transmission which is mediated by the excitation of surface plasmon polaritons. We show how terahertz time-domain spectroscopy has been utilized to determine the resonant transmission effects of hole shape, dielectric properties of materials, and thickness of the arrays. Enhanced terahertz transmission was also observed through a single hole, accompanied by annular periodic corrugations. In addition to metals films, we review films comprised of highly doped semiconductors and superconductors. We finally review various modulation schemes to actively control or manipulate the resonant terahertz transmission using external stimuli such as thermal, optical, and electrical fields. This body of work is used to provide perspective on how manipulation of terahertz radiation via surface plasmon polaritons could affect next-generation terahertz photonic devices.
IEEE Journal of Selected Topics in Quantum Electronics 01/2013; 19(1):8400416-8400416. DOI:10.1109/JSTQE.2012.2208181 · 2.83 Impact Factor
", and nano optical circuitry     . Plasmonics-based optical elements such as waveguides, lenses, beam splitters and reflectors have been implemented by structuring metal surfaces     or placing dielectric structures on metals    , aiming to manipulate the two-dimensional surface plasmon waves. However, the abrupt discontinuities in the material properties or geometries of these elements lead to increased scattering of SPPs, which significantly reduces the efficiency of these components. "
[Show abstract][Hide abstract] ABSTRACT: Plasmonics takes advantage of the properties of surface plasmon polaritons, which are localized or propagating quasiparticles in which photons are coupled to the quasi-free electrons in metals. In particular, plasmonic devices can confine light in regions with dimensions that are smaller than the wavelength of the photons in free space, and this makes it possible to match the different length scales associated with photonics and electronics in a single nanoscale device. Broad applications of plasmonics that have been demonstrated to date include biological sensing, sub-diffraction-limit imaging, focusing and lithography and nano-optical circuitry. Plasmonics-based optical elements such as waveguides, lenses, beamsplitters and reflectors have been implemented by structuring metal surfaces or placing dielectric structures on metals to manipulate the two-dimensional surface plasmon waves. However, the abrupt discontinuities in the material properties or geometries of these elements lead to increased scattering of surface plasmon polaritons, which significantly reduces the efficiency of these components. Transformation optics provides an alternative approach to controlling the propagation of light by spatially varying the optical properties of a material. Here, motivated by this approach, we use grey-scale lithography to adiabatically tailor the topology of a dielectric layer adjacent to a metal surface to demonstrate a plasmonic Luneburg lens that can focus surface plasmon polaritons. We also make a plasmonic Eaton lens that can bend surface plasmon polaritons. Because the optical properties are changed gradually rather than abruptly in these lenses, losses due to scattering can be significantly reduced in comparison with previously reported plasmonic elements.
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