We studied the microwave reflectivity of a structured, near perfectly conducting substrate that was designed to verify existence theoretically proposed new class surface mode. Measurements mode's dispersion curve show it correctly approaches predicted asymptotic frequency; also agrees well with derived from computer simulation. Modeling field distribution on resonance provides evidence strong localization electric at interface and substantial power flow along interface, thus verifying...

Brilliant iridescent colouring in male butterflies enables long–range conspecific communication and it has long been accepted that microstructures, rather than pigments, are responsible for this coloration. Few studies, however, explicitly relate the intra–scale microstructures to overall butterfly visibility, both terms of reflected transmitted intensities viewing angles. Using a focused–laser technique, we investigated absolute reflectivity transmissivity associated with single–scale two...

We present an analytic model to describe the existence of photonic energy gaps in propagation surface plasmon polaritons on corrugated surfaces. concentrate elucidating physical origin band gap, and accordingly we place strong emphasis reasoning assumptions that use. Our is designed give direct access expressions for electromagnetic field charge distributions associated with modes at edges, thus allowing their character be easily appreciated. Having established why a gap occurs then find...

Abstract Beginning from low level concepts the basic understanding for optical excitation of surface plasmons is developed. Prism coupling using attenuated total reflection technique discussed as well less traditional grating technique. A brief discussion some recent developments twisted gratings also presented. Finally a short summary potential device applications given.

We report the first observation of a full photonic band gap for surface modes. An experimental study has been made propagation plasmon polaritons on silver that is textured with hexagonal array dots periodicity 300 nm. find prohibited in all directions modes energies between 1.91 and 2.00 eV.

Current density-voltage characteristics are presented for a molecular structure of the form metal/organic-multilayer/metal which rectifierlike forward bias current density dependence is unequivocally associated with zwitterionic molecules. By placing passive organic barriers between metal layers and active molecules we prove that Schottky barrier effects not important. This clearest evidence so far molecularly controlled rectification, basis electronics.

A detailed analysis of the surface modes a thin slab material dielectric constant ${\mathrm{\ensuremath{\epsilon}}}_{2}$ (=${\mathrm{\ensuremath{\epsilon}}}_{\mathit{r}2}$-i${\mathrm{\ensuremath{\epsilon}}}_{\mathit{i}2}$) surrounded symmetrically by media is presented. Results show that in thin-film limit, as well well-known long-range plasmon for metal layer and TM guided mode dielectric, exists almost any value ${\mathrm{\ensuremath{\epsilon}}}_{2}$. This even true if imaginary part...

We present a new scattering matrix formalism for the modeling of electromagnetic wave propagation in stratified media. It is computationally efficient and stable well suited to layer geometry that characteristic materials. applied successfully total attenuated reflection nematic liquid crystals with beyond-critical-angle incidence when conventional transfer methods normally fail.

Strong resonant transmission of microwave radiation through a very narrow (much less than the wavelength) metallic slit is recorded. The results show that set self-coupled surface plasmons are excited within small gap, giving Fabry-Pérot-like behavior in accord with analytical published earlier [Y. Takakura, Phys. Rev. Lett. 86, 5601 (2001)]. slit, formed by two thick metal plates spaced apart tens microns, inserted wavelength-sized aperture. On resonance transmissivity more 2 orders...

Resonant transmission of microwaves through a subwavelength slit in thick metal plate, into which cuts have been made, is explored. Two orientations the cuts, parallel and perpendicular to long axis slit, are examined. The results show that slits act as though filled with medium anisotropic effective relative permeability at low mode numbers has two values ∼(1, 9.1), increasing 14.4) for higher numbers.

An electron microscope has been used to observe the evaporation of small ( < 50 nm radius) gold particles resting on heated carbon substrates in a vacuum 2.7 x 10 -4 Pa. Evaporation curves for liquid are found agree with predictions Kelvin’s theory which relates vapour pressure surface curvature and, at low rates, solid also have expected monotonic form. However, evaporating temperature range 1160 1330 K, obtained showing characteristic ‘kinked’ nature; that is, each curve obtained, there...

It has recently been shown that the structured surface of a perfect conductor can support surface-plasmon-like modes [Pendry et al., Science 305, 847 (2004)]. Such structures have thickness at least order wavelength. Here, using microwave wavelength radiation incident beyond critical angle wax prism, we quantify dispersion for metamaterial with very much smaller than

Zero-order metal diffraction gratings may give remarkably strong absorption of radiation. This is due to the excitation standing wave coupled surface plasmons in narrow grating grooves. Theoretical modeling shows that a family resonances exists, as grooves are deepened, corresponding successive orders plasmon.

A new modeling system to determine the optical response function of a multilayer structure with imposed periodicity in plane layers, diffraction grating, is described. This model has two essential ingredients. based on well-established coordinate transformation procedure developed by Chandezon et al. [ J. Opt. Soc. Am.72, 839– 846 ( 1982)] which periodically modulated surface transformed into frame it flat, permitting simpler use Maxwell’s boundary conditions. Then, instead using...

The Mg|(LB monolayer)|Pt structures of Z-β-(1-hexadecyl-4-quinolinium)-α-cyano-4-styryldicyanomethanide (C16H33–Q3CNQ) show asymmetric current–voltage characteristics; the behaviour is attributed to organic monolayer although whether it due presence permanent dipole moment or molecular rectification unclear.

Surfaces of low reflectance are ubiquitous in animate systems. They form essential components the visual appearance most living species and can explicitly influence other biological functions such as thermoregulation. The blackness associated with all opaque surfaces reflectivity has until now been attributed to strongly absorbing pigmentation alone. Our present study challenges this assumption, demonstrating that addition requirement pigmentation, complex nano–structures contribute certain...

Metal/Langmuir–Blodgett monolayer/metal devices, where the monolayer consists of dodecyloxyphenylcarbamate 2-bromo, 5(2′-hydroxyethoxy) tetracyanoquinodimethan, a donor-σ-acceptor molecular system, have been constructed, and dc current-voltage (I-V) characteristics these devices were recorded at room temperature. For biases ±20 mV, I-V are linear, changing to nonlinear form for higher voltages. This characteristic exhibited ln(I)∝V1/4 dependence both positive negative voltages up ±1 V....

We compare the optical response of periodic nondiffracting metallic nanoparticle and nanohole arrays. Experimental data from both structures show a pronounced minimum in their wavelength-dependent transmittance that, through numerical modeling, we identify as being due to excitation localized surface-plasmon resonances associated with nanoparticles/nanoholes. Our main finding is while arrays largely independent interparticle separation, shows marked dependence on interhole separation....

If a surface-modulated diffraction grating is arranged so that the scattering vector does not lie in plane of incidence illuminating radiation, then polarization conversion can occur. This be strongly enhanced if surface mode, such as surface-plasmon-polariton or guided excited at surface. In this paper we develop mathematical description process, using method transforms into planar system. The predicted compared very favorably with data for surface-mode-enhanced conversion.