We study the physical origin of extreme optical chirality subwavelength arrays chiral holes in metal. reconstruct nanoscale relief hole by atomic-force microscopy and post-process data to acquire an average unit-cell shape clear noise defects. For this shape, we perform electromagnetic finite difference time domain simulations that reproduce all important features observed light-transmission experiments, including notably strong circular dichroism activity covering whole range possible...

The paper studies, by the finite element method, reflection of surface acoustic waves from single obstacles regular shapes on piezoelectric materials. so-called perfectly matched layer is used to truncate computational domain. following types imperfections are considered: steps, grooves, and projections, as well metallic strips overlaying substrate or inset into it. absolute values phases coefficients computed for YZ 128°YX LiNbO3 substrates functions height-to-wavelength width-to-wavelength...

One-dimensional propagation of a longitudinal wave through an infinite piezoelectric periodically layered structure is considered. The unit cell consists, in general, multilayers separated by thin electrodes which are connected capacitor with capacity Cj that plays the role external electric control providing tunability mechanical properties. main focus present study on effective properties characterizing homogenized medium. Due to boundary conditions, 4×4 transfer matrix M period T can be...

Existence of surface acoustic waves on the boundary half-infinite one-dimensional phononic crystals is investigated. The structure formed perfectly bonded solid nonpiezoelectric layers general anisotropy. are parallel to substrate surface. It shown that at most three can exist in a stopband. number with given order correlated where reversed, namely, total occur within However, if arranged so period symmetric respect its midplane, ``symmetric'' period, then one wave exists per stopband...

The high-frequency pressure induced by a surface acoustic wave in the fluid filling microchannel is computed solving full scattering problem. fabricated inside container attached to top of piezoelectric substrate where propagates. finite element method used. found this way compared with obtained boundary-value problems formulated on basis simplifications which have been introduced earlier papers other research studies. considered example shows that difference between results can be...

The specific features of the Rayleigh wave reflection from single surface imperfections an isotropic substrate are studied by finite element method. Six types considered, namely, upstep and downstep, projection groove, strip foreign material coating buried into it. dependence is found analyzed absolute value phase coefficients on geometrical parameters defects angle incidence. Numerical results compared to analytical predictions based a development coefficient in powers defect height...

This paper analyzes the existence of surface electromagnetic waves (SEWs) at interface bianisotropic bicrystals which are formed half-infinite periodic superlattices or homogeneous media. In either case we assume no absorption. Properties impedance matrices characterizing such media established. On this basis, a series statements is proved on maximum total number SEWs in two composed way that upper (lower) half one bicrystal complements lower (upper) part other to an infinite superlattice...

The existence of nonradiative surface plasmon polaritons (SPPs) is theoretically studied in an isotropic metal film surrounded by optically anisotropic half-infinite dielectrics. By using general properties the impedance matrices dielectrics and films maximum number SPPs has been established at a given value tangential wave number. It proved that, if are nonbianisotropic magneto-optically inactive but uniaxial or biaxial oriented arbitrarily, then most two can exist independently frequency...

A study is made of the elastic wave resonance reflection in a crystal-thin solid layer structure near velocity leaky which originates from an exceptional bulk wave. The latter homogeneous mode with group parallel to boundary medium satisfies condition mechanically free surface. On surface coated thin layer, can transform into and then there arises narrow interval incident angles where coefficients conversion suffer abrupt strong variations phase magnitude. criterion occurence found....

The paper is concerned with the surface acoustic waves propagating in half-infinite one-dimensional piezoelectric phononic crystals of general anisotropy. crystal formed periodically repeated perfectly bonded layers, and its exterior boundary one layer boundaries. occurring so-called full stop bands are considered. It appears that number existing within a band for given layered structure interrelated their same different from only due to reversed ordering layers period. A series statements...

The paper numerically studies the contribution of electric field accompanying surface acoustic wave to actuation streaming in microchannels. finite element method is used. results obtained as applied waves on 128° and 64°-rotated Y cuts LiNbO3 demonstrate that force created by capable accelerating appreciably streaming. In particular, examples are given for situations where increases velocity a factor about 2–3 significantly changes flow pattern compared predictions computations ignoring field.

Prospects of using metal hole arrays for the enhanced optical detection molecular chirality in nanosize volumes are investigated. Light transmission through holes filled with an optically active material is modeled and activity enhancement by more than order magnitude demonstrated. The spatial resolution shown to be a few tens nanometers. From comparing effect cylindrical complex chiral shape, it concluded that sensitivity determined plasmonic near field enhancement. intrinsic due their...

The paper studies the existence of surface acoustic waves in half-infinite one-dimensional piezoelectric phononic crystals consisting perfectly bonded layers, which are arranged so that unit cell is symmetric, i.e., invariant with respect to inversion about its midplane. An example a bilayered structure exterior layer being half thinner than interior layers same material. may be generally anisotropic. maximum possible number acoustoelectric referred fixed wave and given full stop band...