A finite-element method using the Hermitian line elements is proposed for the analysis of planar diffused opticalwaveguides. In the Hermitian line elements, both the field and its derivative are considered at the nod...
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A finite-element method using the Hermitian line elements is proposed for the analysis of planar diffused opticalwaveguides. In the Hermitian line elements, both the field and its derivative are considered at the nodal point. Therefore, the continuity of the field and its derivative between elements can be satisfied. To show the accuracy of the method, a planar diffused opticalwaveguide with exponential index profile is analysed, and the results obtained are compared with the results of the earlier finite-element method using the Lagrangian elements and the exact solutions. In the Hermitian finite-element method, the computation cost can be significantly reduced.
The modified-step-segment method (MSSM) for calculating Ti:LiNbO3 opticalwaveguides is proposed. Because the MSSM employs Bessel functions only for the turning point segment and employs simple circular and hyperbolic...
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The modified-step-segment method (MSSM) for calculating Ti:LiNbO3 opticalwaveguides is proposed. Because the MSSM employs Bessel functions only for the turning point segment and employs simple circular and hyperbolic functions for the other segments, the CPU time and overflow problems are greatly reduced. Excellent agreement with exact results and good convergence characteristics are confirmed.
Singlemode polymeric opticalwaveguides are fabricated by using newly synthesised deuterated polysiloxane with high transparency and high thermal stability, The propagation loss of the waveguides is measured and found...
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Singlemode polymeric opticalwaveguides are fabricated by using newly synthesised deuterated polysiloxane with high transparency and high thermal stability, The propagation loss of the waveguides is measured and found to be less than 0.1dB/cm at 1.31mum and less than 0.5dB/cm at 1.55mum. The propagation loss dependence on wavelength in the infra-red region of the waveguide remains unchanged after heating at 120-degrees-C for 10h.
Annealing of proton-exchanged planar opticalwaveguides in z-cut LiNbO3 fabricated using stearic acid has been studied systematically. The effects of annealing on waveguide propagation loss, surface index change, and ...
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Annealing of proton-exchanged planar opticalwaveguides in z-cut LiNbO3 fabricated using stearic acid has been studied systematically. The effects of annealing on waveguide propagation loss, surface index change, and waveguide depth were measured as a function of annealing time, and were found to follow a power-law relationship.
The design, fabrication and characterisation of birefringent silicon oxynitride planar opticalwaveguides are described for applications at the wavelength of 1.54-mu-m. Form birefringence is attained by interposing a ...
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The design, fabrication and characterisation of birefringent silicon oxynitride planar opticalwaveguides are described for applications at the wavelength of 1.54-mu-m. Form birefringence is attained by interposing a thin silicon nitride film in the waveguide stack, and can be controlled by adjusting the nitride layer thickness. Dispersion characteristics of the oxynitride waveguides have been measured and compared with theory.
Proton-exchanged planar waveguides were demonstrated in Z-cut LiNbO3 using toluic acid as a new organic proton source. These waveguides exhibit a propagation loss of around 1 dB/cm, and a step refractive index profile...
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Proton-exchanged planar waveguides were demonstrated in Z-cut LiNbO3 using toluic acid as a new organic proton source. These waveguides exhibit a propagation loss of around 1 dB/cm, and a step refractive index profile with an index increase of 0.124 measured at 0.663-mu-m. The diffusion rate was found to be lower than those obtained using the popular benzoic and phosphoric acids.
We present a comparison of two recently developed methods of analyzing opticalwaveguides. One of them is numerical, and the other is an approximate analytical method.
We present a comparison of two recently developed methods of analyzing opticalwaveguides. One of them is numerical, and the other is an approximate analytical method.
We demonstrated the feasibility of using integrated optical output grating couplers in direct immunosensing. We monitored as functions of time, first the adsorption of an antigen (Ag) on the waveguide's surface, a...
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We demonstrated the feasibility of using integrated optical output grating couplers in direct immunosensing. We monitored as functions of time, first the adsorption of an antigen (Ag) on the waveguide's surface, and subsequently, the binding of the corresponding antibody (Ab), i.e. the formation of the immuno-complex Ag-Ab. The Ag was human immunoglobulin G (h-IgG), and the Ab was rabbit anti-h-IgG. We also studied the adsorption of avidin. The refractive indices n(F'), thickness d(F'), and surface coverages-GAMMA of the adsorbed adlayers and of the immuno-complex Ag-Ab, respectively, were determined.
An increase in the photoinduced refractive-index change DELTAn in silica-based opticalwaveguides on silicon is described. The increase is attained by the consolidation of a core film in a reducing atmosphere. A maxim...
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An increase in the photoinduced refractive-index change DELTAn in silica-based opticalwaveguides on silicon is described. The increase is attained by the consolidation of a core film in a reducing atmosphere. A maximum DELTAn of 3-9 x 10(-4) is obtained for the TE mode by UV laser irradiation at 248 nm. This is four times larger than that in conventional waveguides.
For the first time, refractive-index changes are described which are due to laser irradiation in a Mach-Zehnder interferometer composed of TiO2-doped silica opticalwaveguides on an Si substrate. A maximum refractive-...
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For the first time, refractive-index changes are described which are due to laser irradiation in a Mach-Zehnder interferometer composed of TiO2-doped silica opticalwaveguides on an Si substrate. A maximum refractive-index change of about 1.0 x 10(-5) is obtained around 1.5-mu-m at an Ar+ laser throughput power of 2.1 W and an irradiation time of 1 h even though the concentration of TiO2 is very low (about 0.3 mol. %).
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