Tunable Lateral Shift Through Nonlinear Composites of Nonspherical Particles

Abstract

Abstract-The Goos-Hänchen (GH) shifts of the reflected waves from nonlinear nanocomposites of interleaved nonspherical metal and dielectric particles are investigated both theoretically and numerically. First, based on spectral representation theory and effective medium approximation, we derive the field-dependent effective permittivity of nonlinear composites. Then, the stationary phase method is adopted to study the GH shifts from nonlinear composites. It is found that for a given volume fraction, there exist two critical polarization factors L c1 and L c2 , and bistable GH shifts appear only whenMoreover, both giant negative and positive GH shifts accompanied with large reflectivity are found, hence they can be easily observed in experiments. The reversal of the GH shift may be controlled by adjusting both the incident angle and the applied field. Numerical simulations for Gaussian-type incident beam are performed, and good agreement between simulated data and theoretical ones is found especially for large waist width.

Amplitude control of the Goos–Hänchen shift via a Kerr nonlinearity

“…Recently, some proposals have been suggested to control the GH shift in the reflected beam via an external electric field. In these proposals, structures of symmetrical metal-cladding waveguides and nonlinear metal-dielectric composites were proposed to control the GH shift in the reflected beam via an external electric field [31][32][33]. Further, the temperature dependence of the GH shift has also been investigated in a metal/dielectric composite material [34].…”

Beam shifts on reflection of electromagnetic radiation off anisotropic crystals at optic phonon frequencies

“…Although originally considered with respect to total internal reflection, there has been considerable interest recently in the concept of Goos-Hänchen shifts on external reflection from air. Examples of such shifts have included those that occur on external reflection off metals [6][7][8], absorbing dielectric media [6,9,10], as well as from lefthanded [11][12][13] and chiral media [14], photonic crystals [15] and composite materials [16][17][18]. Although most studies of lateral displacements involving a single interface have concentrated on isotropic media, the effects of anisotropy in the reflecting medium have been investigated by Cheng and Cui [19] and by Huang et al [18].…”

Impedance-Mismatched Hyperlens With Increasing Layer Thicknesses

“…In the following study, we will study on utilizing different methods (e.g., separating all the layers into M groups (M > 2) or adjusting the surface termination [22]) to optimize such kind of hyperlens in detail. Moreover, tunable hyperlens will be studied based on the different novel materials (e.g., composites of negative-permittivity particles) [27][28][29]. Such system can overcome some drawbacks of the structures from pure metals and can work for any desired wavelengths by just adjusting the volume fraction of negative-permittivity particles.…”