Terry Gorman

Numerical Analysis of a Photonic Crystal Fiber for Biosensing Applications

This 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 E₁₁^x and H E₁₁^x 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 E₁₁^x and H E₁₁^y, respectively, are reported for the amplitude interrogation mode, while resoutions of 5 × 10^-5 RIU and 6×10^-5 RIU are reported for H E₁₁^x and H E₁₁^y, respectively, for the wavelength interrogation mode.

Dual channel planar waveguide surface plasmon resonance biosensor for an aqueous environment

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 analyte or self referencing mode. The channel discriminative property of the device is investigated using an eigenmode solver with perfectly matched layers (PML).

Design and optimization of a novel surface plasmon resonance biosensor based on Otto configuration

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(-6) RIU has been demonstrated for an aqueous analyte.

Bending Effects on Highly Birefringent Photonic Crystal Fibers With Low Chromatic Dispersion and Low Confinement 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 dispersion across a wide wavelength range have been presented. The effects of bending on birefringence, confinement losses and chromatic dispersion of the fundamental mode of the proposed PCFs have been thoroughly investigated by employing 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.

Ultra-High-Speed Deeply Etched Electrooptic Polymer Modulator With Profiled Cross Section

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 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 Zc, microwave effective index Nm, microwave and dielectric losses alphac and alphad , and the half-wave voltage-length product V pi L.

Enhanced Effective Area Photonic Crystal Fiber With Novel Air Hole Design

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 μm2. The proposed PCF structures consist of five air-hole rings, where the air hole diameters are different from one ring to another. In the second ring six air holes are alternatively removed. The effective mode area of the proposed structure was calculated and compared with effective mode areas reported in literature. It is shown that the effective mode area is enhanced compared to other structures. Additionally, critical propagation properties such as chromatic dispersion, confinement losses, bend losses and nonlinear coefficient of proposed PCF structures are reported thoroughly.

Design Optimization of

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 layer thickness, the electrode height, the electrode trapezoidal profile, and the waveguide trapezoidal profile on the microwave effective index Nm, the characteristic impedance Zc, the microwave losses alphac, and the half-wave voltage-length product VpiL has been reported. Optimization of these parameters yield to a novel design of the LN modulator, with a low VpiL 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.

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Surface plasmon resonance (SPR) sensors provide high sensitivity without the use of molecular labels (Homola, Yee, and Gauglitz 1999). They been widely used in the analysis of biomolecular interactions (BIA) and detection of chemical and biological analytes (Homola, Yee, and Gauglitz 1999), where they provide benefits of real-time, sensitive and label-free technology. They have also been used for the detection of various chemical and biological compounds in areas such as environmental protection, food safety and medical diagnostics (Mouvet et al. 1997; Nooke et al. 2010).

-Cut Lithium Niobate Electrooptic Modulator With Profiled Metal Electrodes and Waveguides

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 Nm, characteristic impedance Zc, and half-wave voltage length product VpiL.

A Novel Compact Photonic Crystal Fibre Surface Plasmon Resonance Biosensor for an Aqueous Environment

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.