Resonant waveguide–grating switching device with nonlinear optical material

Abstract

The design and analysis of a dielectric guided-mode resonance filter (GMRF) utilizing a nonlinear material for the waveguide is presented. Small changes to the parameters of a GMRF have a large impact on its resonance. A nonlinear material can provide a small change in the refractive index of the waveguide, altering the resonance of the device and resulting in modulation of the transmitted and reflected output of the filter. Numerical results show that nonlinear switching from 100% transmission to 100% reflection can be accomplished with less than 100 kW/cm(2) using a simple design.

Active resonant subwavelength grating for scannerless range imaging sensors

“…Also, we are employing linear modeling codes, such as Rigorous Coupled Wave Analysis to predict the optical response as a function of waveguide index. Figure 3 shows the cross-section of an RSG design [3] utilized in the analysis on an active component around an incident, visible wavelength of 638.6 nm. The predicted transmitted and reflected resonances are shown in Figure 4 for a normally incident beam with TE polarization, as a function of input wavelength.…”

“…To avoid the absorption evident in Figure 14, a dual-layer grating can distance the lossy ITO from the high electric fields present in the guiding layer. The lower layer of the grating may be either the low-index SiO 2 , or the high-index BaTiO 3 . Figure 15 shows the results of the numerical simulation for the SiO 2 case.…”

Tunable resonant narrow-band filter based on electro-optic materials

“…Magnusson and Wang firstly suggested that GMR filters can be used as tunable optical filters or as low-power optical switching devices 7 . Then theoretical studies 8 and other types of tunable GMR devices 2,3,9 have been demonstrated [10][11][12] . Some studies involve the E-O effect in liquid crystals to tune the resonance wavelength in dielectrics 13,14 or metallic (plasmonic) 15 GMR filters.…”

Filter Response of Resonant Waveguide Dielectric Gratings at Plane-Wave Conical Incidence

“…Research in this field has the potential of producing a new class of passive elements called resonant waveguide gratings with a large number of applications. A few of these possible uses include static and tunable spectral filters with arbitrarily narrow, controlable linewidths, optical switches and modulators, polarizers, couplers, and many other applications [13][14][15][16][17].…”