Abstract
Analysis of optical waveguides with thin metal films is studied by the multidomain pseudospectral frequency-domain (PSFD) method. Calculated results for both guiding and leaky modes are precise by means of the PSFD based on Chebyshev-Lagrange interpolating polynomials with modified perfectly matched layer (MPML). By introducing a suitable boundary condition for the dielectric-metallic interface, the stability and the spectrum convergence characteristic of the PSFD-MPML method can be sustained. The comparison of exact solutions of highly sensitive surface plasmon modes in 1D dielectric-metal waveguides and those calculated by our PSFD-MPML demonstrates the validity and usefulness of the proposed method. We also apply the method to calculate the effective refractive indices of an integrated optical waveguide with deposition of the finite gold metal layer which induces the hybrid surface plasmon modes. Furthermore, the 2-D optical structures with gold films are investigated to exhibit hybrid surface plasmon modes of wide variations. We then apply hybrid surface plasmon modes to design novel optical components-mode selective devices and the polarizing beam splitter.
Highlights
The principle of the surface plasmon resonance (SPR) technology has been proposed for decades [1,2,3,4,5,6], and it was widely used in optical waveguide design [7,8,9,10,11,12,13,14,15], in which metals (Au, Ag, Al, Cu) are deposited on the dielectric materials
We have verified that our proposed pseudospectral frequency-domain (PSFD)#140075 - $15.00 USD
modified perfectly matched layer (MPML) method is especially suitable for analyzing such kind of problems
Summary
The principle of the surface plasmon resonance (SPR) technology has been proposed for decades [1,2,3,4,5,6], and it was widely used in optical waveguide design [7,8,9,10,11,12,13,14,15], in which metals (Au, Ag, Al, Cu) are deposited on the dielectric materials. With the help of polarization/mode selection devices, different modes at certain wavelengths can be packed into the multi-mode waveguides and it can improve the flexibility of the electromagnetic field distributions. Such characteristics can be adopted in the design of the polarizing beam splitters by coating the gold thin film in the optical waveguides and couplers, which is useful to reduce the scale. In Subsection 2.1 of this paper, we will firstly investigate the field characteristic of the SP and HSP modes by applying our PSFD-MPML method in the 1-D dielectric-metal waveguide.
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