A truly variational method for analysing polarised modes in optical rib waveguides is presented. The new method exploits recent advances in rib waveguide analysis where the use of effective widths simplifies the semic...
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A truly variational method for analysing polarised modes in optical rib waveguides is presented. The new method exploits recent advances in rib waveguide analysis where the use of effective widths simplifies the semiconductor/air interface. Results obtained for both TE and TM polarisation are validated using benchmark results produced using established methods.
The first silicon 1x2 digital opticalwaveguide switch which relies on free-carrier plasma dispersion and waveguide-vanishing effect is demonstrated. Operation is demonstrated at a wavelength of 1.3 mu m.
The first silicon 1x2 digital opticalwaveguide switch which relies on free-carrier plasma dispersion and waveguide-vanishing effect is demonstrated. Operation is demonstrated at a wavelength of 1.3 mu m.
The authors propose a multimode waveguide photodiode utilising asymmetric waveguide structure which is suitable for optical hybrid integration without coupling lenses, and has a high responsivity of 0.95 A/W at a wave...
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The authors propose a multimode waveguide photodiode utilising asymmetric waveguide structure which is suitable for optical hybrid integration without coupling lenses, and has a high responsivity of 0.95 A/W at a wavelength of 1.31 mu m. Its 1 dB coupling tolerance to a planar lightwave circuit is +/-2 mu m in the vertical direction.
waveguide losses in SOI (silicon-on-insulator) material fabricated by different techniques are compared thus enabling us to confirm the theoretical dependence of losses on layer thickness. Single-mode waveguide losses...
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waveguide losses in SOI (silicon-on-insulator) material fabricated by different techniques are compared thus enabling us to confirm the theoretical dependence of losses on layer thickness. Single-mode waveguide losses in BE-SOI (bond and etchback-SOI) below 0.5dB/cm are reported for waveguides with cross-sections of several square micrometres.
The first ion implanted opticalwaveguide in the nonlinear material KTP is reported. The refractive index profiles are characterised for both n(x) and n(z), and the loss is examined after an annealing. The index chang...
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The first ion implanted opticalwaveguide in the nonlinear material KTP is reported. The refractive index profiles are characterised for both n(x) and n(z), and the loss is examined after an annealing. The index changes (approximately 0% in the electronic interaction region and approximately 4% decrease in the nuclear stopping region) show that a typical barrier waveguide is formed in the implanted KTP. The tuning wavelength ranges for type 2 zero mode phase matching SHG in ion implanted waveguides as a function of guide widths are calculated for different propagating angles.
The Resonant Mirror biosensor is a new design of optical sensor, aimed at combining the improved sensitivity of waveguide sensors with the simplicity of fabrication and ease of use associated with surface plasmon sens...
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The Resonant Mirror biosensor is a new design of optical sensor, aimed at combining the improved sensitivity of waveguide sensors with the simplicity of fabrication and ease of use associated with surface plasmon sensors. It uses the evanescent wave associated with a dielectric resonant structure to probe reactions occurring in a sensing layer, deposited within a few hundred nanometers of the device surface and is aimed at the real time monitoring of biological assays, without use of labelled molecules. This paper describes the operation of the device and performance features relevant to its use as a biosensor.
An input grating coupler instrument with planar monomode waveguides as sensors was used for real-time monitoring of protein adsorption and of affinity- and immunoreactions. The adsorbed proteins studied were avidin an...
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An input grating coupler instrument with planar monomode waveguides as sensors was used for real-time monitoring of protein adsorption and of affinity- and immunoreactions. The adsorbed proteins studied were avidin and immunoglobulins (h-IgG). In affinity- and immunosensing, adsorbed monolayers of these proteins formed the receptors on the waveguide surface for the corresponding ligand in the sample. The formation of complexes between avidin and biotinylated protein A (prot A) and biotinylated bovine serum albumin (BSA), between h-IgG and anti-hIgG, and between h-IgG and prot A were investigated. With an improved sensor instrument, changes of the effective refractive indices N(TE0) and N(TM0) of the TE0 and TM0 guided modes at two laser wavelengths lambda1 = 632.8 nm and lambda2 = 514.5 nm were measured. From these data not only the thickness d(F), but also the refractive index n(F), and the surface coverage GAMMA' of an adsorbed or bound single isotropic adlayer F' were determined at both wavelengths. This model was extended to include (i) a possible optical anisotropy a(F), of an (adsorbed single) adlayer and (ii) the formation of double adlayers (F' + F'') in affinity reactions, adlayer F' describing the immobilized receptors and adlayer F'' the bound ligands. The SiO2-TiO2 waveguides, fabricated by a sol-gel process, are microporous and, in aqueous buffer solutions, show a slow but persistent increase of the measured effective refractive indices with time. This drift effect is greatly diminished in compact SiO2-TiO2 waveguides annealed at a temperature of T = 900-degrees-C (instead of T = 500-degrees-C).
A radiation mode technique, first used in optical fibre theory, is used to study the propagation of waves in practical optoelectronic devices. The method is validated against other techniques for step discontinuities,...
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A radiation mode technique, first used in optical fibre theory, is used to study the propagation of waves in practical optoelectronic devices. The method is validated against other techniques for step discontinuities, tapers, air-gaps and Y junctions. The solution deals successfully with reflected waves and is found to be accurate enough to be used for design purposes.
Using an input grating coupler instrument and monomode opticalwaveguides, we studied the adsorption of various proteins (e.g. human immunoglobulins G and A (h-IgG and h-IgA), and avidin) on the waveguide surface. In ...
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Using an input grating coupler instrument and monomode opticalwaveguides, we studied the adsorption of various proteins (e.g. human immunoglobulins G and A (h-IgG and h-IgA), and avidin) on the waveguide surface. In model experiments for immunoassays, we also monitored as a function of time the formation of the immuno-complex Ag-Ab between antigen (Ag) molecules adsorbed on the waveguide surface and antibody (Ab) molecules, for example, of adsorbed h-IgG vs anti-h-IgG, anti-goat-IgG (cross-reaction) and anti-h-IgA (negative test). We also studied the affinity reaction between absorbed protein A and h-IgG. From the measured changes in the effective refractive indices N(TE0) and N(TM0) of the TE0 and TM0 modes, we determined the thickness d(F'), the refractive index n(F'), and the surface coverage GAMMA of the adsorbed protein adlayers and of the immuno-complexes.
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