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his paper presents a theoretical study on a photonic crystal fiber (PCF) surface plasmon resonance biosensor. The proposed PCF sensor introduces the concept of simultaneous detection with H E11x and H E11x modes, which opens up some possibilities for multianalyte/multichannel sensing. Analysis was performed which considered the operation of the sensor in both amplitude and wavelength interrogation modes. Typical sensor resolutions of 4×10-5 RIU and 8×10-5 RIU with respect to H E11x and H E11y, respectively, are reported for the amplitude interrogation mode, while resolutions of 5 × 10-5 RIU and 6×10-5 RIU are reported for H E11x and H E11y, respectively, for the wavelength interrogation mode.

A theoretical study on a dual channel planar waveguide surface plasmon biosensor is presented in this paper. The proposed device consists of a planar waveguide with two active regions. It has been demonstrated that the proposed waveguide sensor can be configured to operate in either multi anlalyte or self referencing mode. The channel discriminative property of the device is investigated using an eigenmode solver with perfectly matched layers (PML).

There is interest in photonic crystal fibers (PCFs) that possess a large effective area.We demonstrate that it is possible to design a PCF structure configuration with an effective mode area as high as 3000 m

In this paper we present a novel ultra-high-speed polymer electro-optic modulator that incorporates high permittivity material cladding on the side walls of the device. We show that by packing the side walls of the modulator with this material and varying the width of the dielectric stack and electrodes that broadband operation can be achieved whilst maintaining a very low drive voltage in a compact device. The full-wave finite element analysis is employed in order to determine any frequency dispersion effects with respect to the modulators half-wave voltage-length product, characteristic impedance, microwave effective index and microwave dielectric losses.

Photonic crystal fibers (PCFs) with elliptical air-holes located in the core area that exhibit high birefringence, low losses, enhanced effective mode area, and low chromatic dispersoin across a wide wavelength range have been presented. The effects of bending on birefringence, confinement losses and chromatic disperson of the fundamental mode of the proposef PCFs have been thoroughly investigated by employng the full vectorial finite element method (FEM). Additionally, localization of higher order modes is presented. Also, effects of angular orientation on bending loss have been reported. Significant improvement on key propagation characteristics of the proposed PCFs are demonstrated by carefully altering the desired air hole diameters and their geometries and the hole-to-hole spacing.

A theoretical study on a novel planar waveguide surface Plasmon Biosensor is presented in this paper. The proposed biosensor has a configuration similar to the Otto excitation mechanism for surface Plasmon polaritons. The performance of the device with respect to key system parameters such as gap width and device length is investigated using an eigenmode solver with perfectly matched layers (PML). Device resolution of 2.3 x 10-4 RIU has been demonstrated for an aqueous analyte.

In this paper, we present a novel ultra-high-speed polymer based electrooptic modulator that features a profiled, deeply etched cross section. We show that by profiling the side walls of the modulator and varying the thickness of the dielectric stack that broadband operation can be achieved whilst maintaining a very low drive voltage in a compact device. Initially a quasi-TEM analysis is undertaken in order to determine the modulator's response to topographical variation followed by a full-wave analysis on the optimized device. The full-wave analysis is employed in order to determine any frequency disperson effects with respect to the modulators characteristic impedance Zc, microwave effective index Nm, microwave and dielectric losses alpha-c and alpha-d, and the half-wave voltage-length product VnL.

In this paper, we present a novel ultra-high-speed polymer-based electrooptic modulator that incorporates high permittivity material cladding on the side walls of the device. We show that by packing the side walls of the modulator with this material and varying the width of the dielectric stack and electrodes that broadband operation can be achieved while maintaining a very low drive voltage in a compact device. Initially, a quasi-TEM analysis is undertaken in order to determine the modulators response to topographical variation followed by a full-wave analysis on the optimized device. The full-wave analysis is employed in order to determine any frequency dispersion effects with respect to the modulators characteristic impedance Z(c), microwave effective index N-m, microwave and dielectric losses a. and ad and the half-wave voltage-length product V pi L.

In this letter, we present a novel lithium niobate (LN) electrooptic modulator. The proposed modulator incorporates a thin layer of LN and a slotted substrate structure that together facilitate velocity and impedance matching. A full-wave analysis of the proposed modulator is undertaken in order to establish the frequency dispersion effects with respect to the devices microwave effective index N-m, characteristic impedance Z(c), and half-wave voltage length product V pi L.

Analysis and optimization of an ultra-high-speed Z-cut lithium niobate (LN) electrooptic modulator, operating at a high-frequency region, by using a full-wave finite-element numerical technique, has been demonstrated. Investigation of the effects of adjusting the buffer lay thickness, the electrode height, the electrode trapezoidal profile, and the waveguide trapezoidal profile on the microwave effective index N-m the characteristic, impedance Z(c) the microwave losses alpha(c) the half-wave voltage-length product V pi L has been reported. Optimization of these parameters yield to a novel design of the LN modulator, with a low V pi L and a high bandwidth, operating at a frequency range between 1 and 100 GHz. The frequency-dependent dispersion of the key device parameters, with the aim of determining the device suitability for high-speed operation, has been demonstrated.