We develop a simple local-field-effect theory in order to calculate the polarization near surface and dielectric response of crystals. obtain surface-induced anisotropy all optical properties cubic A calculation reflectance Ge(110) is good agreement with recent measurements.

We obtain exact expressions for the Casimir forces between arbitrary materials using concept of surface impedance. verify their consistency with well-known perfect conductors and Lifshitz formula semi-infinite local homogeneous media. As an application we present a full rigorous calculation force two metallic half spaces described by hydrodynamic nonlocal dielectric response.

We calculate the dielectric response of free-standing and supported two-dimensional layers polarizable entities, such as metallic particles or adsorbed molecules. take into account dipole-dipole image interaction investigate effects disorder within a renormalized polarizability theory. The behavior resonances arising from both single particle's substrate's surface plasmon is studied.

We calculate the nonlinear dipole and quadrupole moments induced at second-harmonic (SH) frequency $2\ensuremath{\omega}$ in a small dielectric sphere by an inhomogeneous monochromatic electric field of $\ensuremath{\omega}.$ neglect finite-size effects assume that selvedge region is thin enough so surface may be considered locally flat. The second-order displays resonances corresponding to excitation dipolar quadrupolar plasmons $\ensuremath{\omega}$ plasmon $2\ensuremath{\omega},$ besides...

We report the first observation of a large (more than 10%) reflectance anisotropy on Ag(110) single crystal. reproduce experimental data fairly well by use theoretical model, based quasistatic approximation, which takes into account both actual geometry crystal surface and interband intraband transitions. This demonstrates that main effect is screened local-field resonant dipolar oscillation localized near surface.

We develop a simple theory for the macroscopic dielectric function of system identical spheres embedded in homogeneous matrix within dipolar long-wavelength approximation. obtained relationship similar to Clausius-Mossotti relation, but with renormalized polarizability instead bare polarizability. This obeys second-order algebraic equation and it is given terms polarizability, volume fraction, functional two-particle correlation spheres. calculate optical properties metallic an insulating we...

We develop a simple transfer-matrix formalism in order to obtain the dispersion relation of electromagnetic normal modes an infinite insulator-metal (or highly doped semiconductor) superlattice, taking into account presence plasma waves, spatial dispersion, and retardation. also calculate p-polarized reflectance give analytical expressions for surface impedance, reflection amplitude, semi-infinite superlattice. find resonant features corresponding propagation guided waves metal layers...

We obtain closed-form expressions for the macroscopic dielectric response of systems with spatial fluctuations, taking into account local-field effect. The is written, without reference to any specific representation, in terms microscopic operator and projection operators that extract average fluctuation components fields. results are very general since few assumptions made about nature system its response, relaxed conditions imposed on projectors. put special emphasis which length scale...

Optical second-harmonic generation (SHG) is used as a noninvasive probe of the interfaces Si nanocrystals (NCs) embedded uniformly in an SiO2 matrix. Measurements generated SH mode verify that polarization has nonlocal dipole form proportional to (E x Delta inverted) E depends on inhomogeneities incident field E, proposed recent models based locally noncentrosymmetric dipolar response averaged over spherical NC interfaces. A two-beam SHG geometry found enhance this greatly compared...

We develop a theory for the calculation of optical second-harmonic generation spectra Si incorporating nonlinear surface local field effect. Our model consists four interpenetrated fcc lattices nonlinearly polarizable bonds. Each them is anisotropic and although they are centrosymmetric, respond quadratically to spatial inhomogeneities polarizing field. The large gradient induced at bond due dipole moment neighbor leads second order polarization. In bulk, each lies within centrosymmetric...

A simple formalism is developed for the calculation of optical properties a nonlocal system, treating continuous change its response functions near surface as perturbation. The impedance obtained in terms unperturbed system and conductivity. results are very general since no assumption about made, it shown that they include those previous theories.

We calculate the optical second harmonic (SH) radiation generated by small spheres made up of a homogeneous centrosymmetric material illuminated inhomogeneous transverse and/or longitudinal electromagnetic fields. obtain expressions for hyperpolarizabilities particles in terms multipolar bulk susceptibilities and dipolar surface their constitutive material. employ resulting response functions to nonlinear composite medium an array such patterns efficiency SH generation from edge thin films...

We show, using a simple local-field-effect theory, that the ratio of surface conductivity an overlayer physisorbed on crystalline to its in absence local-field effect is proportional square local field produced by substrate, and therefore very sensitive position adsorbate. The application this result optical determination adsorption sites analyzed.

Herein, we establish a new perspective towards economically viable non-toxic fluorescent probes as potential substitute of expensive alternative for the detection MeOH in alcoholic beverages.

We develop a model for surface second-harmonic generation (SHG) consisting of semi-infinite system made up continuous distribution harmonic polarizable entities, each which responds nonlinearly to the gradient field. The near discontinuity some field components at yields finite susceptibility tensor characterized by parameters a(\ensuremath{\omega}) and b(\ensuremath{\omega}), as well bulk nonlinear response charcterized d(\ensuremath{\omega}). obtain analytical expressions a, b, d in terms...

We calculate the corrections to Casimir force between two metals due spatial dispersion of their response functions. employ model-independent expressions for in terms optical coefficients. express non-local Fresnel coefficients employing surface $d_\perp$ parameter, which accounts distribution screening charge. Within a self-consistent jellium calculation, increases significatively small separations. The nonlocal correction has opposite sign than previously predicted hydrodynamic models and...

We calculate the electron-energy-loss spectra and normal surface modes of low-index faces Ag single crystals. To this end we develop a model that accounts for crystalline geometry both intraband interband transitions. obtain response functions display resonant structure due to face- orientation-dependent modes, which lead an anisotropy in loss finite momentum transfers. Furthermore, they large optical reflectance.

A general formalism for the calculation of macroscopic dielectric response spatially fluctuating systems is used to obtain, following a unified approach, expressions (1) corrections Clausius-Mossotti function in disordered systems, (2) optical coefficients and surface plasmon polaritons rough surfaces, (3) electromagnetic modes infinite crystals, (4) change crystal neighborhood its surface, under assumption that length scale fluctuations much smaller than wavelength light.

We use a homogenization procedure for Maxwell's equations in order to obtain the local limit frequency-dependent macroscopic dielectric-response tensor ${ϵ}_{ij}^{M}(\ensuremath{\omega})$ of metamaterials made matrix with inclusions any geometrical shape repeated periodically lattice structure. illustrate formalism calculating several structures. For dielectric rectangular within conducting material we an anisotropic response that may change from conductorlike at low $\ensuremath{\omega}$...

We present calculations of the optical properties a hydrogenated (110) Si surface, including surface-induced changes electron polarizability and in local-field effect. While surface effect alone yields results good agreement with reflectance anisotropy experiments performed on natural surfaces, give rise to substantial modifications spectra. The origin difference between surfaces dissimilar terminations is discussed.