Electrically tunable optical bistability based on one-dimensional photonic crystals with nonlinear nanocomposite materials

Abstract

A one-dimensional photonic crystal structure with a nonlinear metal-dielectric nanocomposite defect layer is proposed to control the optical bistability (OB) of the transmitted wave by tuning the externally applied dc electric field. Using the transfer matrix method for dielectric layers and solving the Helmholtz nonlinear equation in the nonlinear composite layer, the linear transmittance spectrum and the nonlinear transmission curve are illustrated graphically for different applied fields. A field-dependent defect mode is observed in the linear transmittance spectrum. Consequently, the OB switch-up and -down thresholds can be manipulated via the applied field intensity. Due to the field dependence of composite layer refractive index, the physical response of the observation is the dynamical shifting of the defect mode. Moreover, it is shown that the volume fraction, shape, and type of the embedded nanoparticles as well as the kind of the dielectric host have large influences on the OB threshold. The proposed structure has significant potential applications in optical integrated devices.

Effect of the Nonlinearity on Optical Properties of One-Dimensional Photonic Crystal

“…The dynamic shifting of the PBG or the resonance peak can produce optical bistability phenomena as proved in the references [12,41,42].…”

Single-step detection of toxic airborne metallic nanoparticles using Goos–Hänchen effect in photonic Bragg grating structures

“…It is also necessary to assume that the nanoparticles with permittivity of Ɛ 2 and susceptibility of χ 2 are randomly distributed in air and have occupied volume fraction f of the host. However, for simplicity, we can consider that all particles have the same shape with a depolarization factor of L z along the z-direction which is, of course, a geometry-dependent quantity [32]. I.e.…”

“…Here E 0 2 | | á ñ is the spatial average of the local field squared over the nonlinear particle. Thus the effective (fielddependent) permittivity of the sampling cell could be calculated via [32,33]:…”

Multidimensional Nonlinear Landscape Planning Based on Parameter Feature Extraction and Multimedia Technology

“…In the field of practice, some avant-garde researchers have combined computer language with genetic engineering and biomedicine and achieved experimental results such as the so-called "intelligent evolution space." Accordingly, many famous architectural professional media have also opened up special columns for the application of digital technology in architectural design [7]. Han et al believe that RS is the fastest acquisition method with the largest coverage of spatial information.…”