Demonstration of integrated optics elements based on long-ranging surface plasmon polaritons.
ABSTRACT An experimental investigation of long-ranging surface plasmonpolariton waves guided along thin finite width Au structures embedded in a homogeneous background dielectric is reported. The operation of key passive integrated optics elements such as straight waveguides, s-bends, y-junctions and couplers is demonstrated at a free space optical wavelength of 1550 nm. The influence of some important design parameters on the performance of these elements is presented and discussed.
09/2014; 7(3):300-319. DOI:10.1007/s12200-014-0435-1
Article: Infrared Plasmonics via ZnO[Show abstract] [Hide abstract]
ABSTRACT: Conventional plasmonic devices involve metals, but metal-based plasmonic resonances are mainly limited to λres < 1 μm, and thus metals interact effectively only with light in the UV and visible ranges. We show that highly doped ZnO can exhibit λres ≥ 1 μm, thus moving plasmonics into the IR range. We illustrate this capability with a set of thin (d = 25–147 nm) Al-doped ZnO (AZO) layers grown by RF sputtering on quartz glass. These samples employ a unique, 20-nm-thick, ZnON buffer layer, which minimizes the strong thickness dependence of mobility (μ) on thickness (d). A practical waveguide structure, using these measurements, is simulated with COMSOL Multiphysics software over a mid-IR wavelength range of 4–10 μm, with a detailed examination of propagation loss and plasmon confinement dimension. In many cases, Lplas < λlight, thus showing that IR light can be manipulated in semiconductor materials at dimensions below the diffraction limit.Journal of Nano Research 06/2014; 28:109-119. DOI:10.4028/www.scientific.net/JNanoR.28.109 · 0.52 Impact Factor
IEEE Photonics Journal 02/2015; 7(1):4800208. · 2.33 Impact Factor