Showing papers by "Muttukrishnan Rajarajan published in 2006"
TL;DR: In this paper, the effects on the modal properties of metal-clad dielectric guides with the cladding thickness and the formation of the supermodes due to coupling between the SPMs in the presence of different surrounding materials are investigated.
Abstract: Finite element analysis, based on the vector H-field formulation and incorporating the perturbation technique, is used to calculate the complex propagation characteristics of metal-coated dielectric waveguides at terahertz frequencies. The propagation and attenuation characteristics of surface-plasmon modes (SPMs) at the metal/dielectric interfaces are presented. The effects on the modal properties of metal-clad dielectric guides with the cladding thickness and the formation of the supermodes due to coupling between the SPMs in the presence of different surrounding materials are also investigated
18 citations
01 Nov 2006
TL;DR: This paper presents a protocol that will share the information securely to the intended recipient using the XML encryption and XML signature technologies.
Abstract: Mobile and wireless devices have penetrated the health care sector due to their increased functionality, low cost, high reliability and easy-to-use nature. However, in such health care applications the privacy and security of the transmitted information must be preserved. Also different personal involved in the healthcare industry must have different access privileges to the patient information. In this paper we present a protocol that will share the information securely to the intended recipient using the XML encryption and XML signature technologies.
18 citations
TL;DR: In this article, the effects of the pitch-distance, hole diameter, structural asymmetry, air hole arrangement and the operating wavelength on the modal birefringence of photonic crystal fibers with equal and unequal circular air holes were investigated.
Abstract: Modal solutions of photonic crystal fibers with equal and unequal circular air holes in a hexagonal matrix are presented, by using a rigorous full-vectorial finite element-based approach. The effective indices, mode field profiles, spot-sizes, modal hybridness, modal birefringence and group velocity dispersion values have been determined and presented. The effects of the pitch-distance, hole diameter, structural asymmetry, air hole arrangement and the operating wavelength on the modal birefringence are also reported. It is shown that a significant value of birefringence can be achieved by using only circular air holes, which would be easy to fabricate, and by operating it close to its modal cutoff.
16 citations
TL;DR: Finite-element analysis, based on the vector H-field formulation and incorporating the perturbation technique, is used to calculate the complex propagation characteristics of metal-coated dielectric waveguides.
Abstract: Finite-element analysis, based on the vector H-field formulation and incorporating the perturbation technique, is used to calculate the complex propagation characteristics of metal-coated dielectric waveguides. The propagation and attenuation characteristics of the surface-plasmon modes at the metal/dielectric interfaces are presented. The effects on the optical properties of metal-clad optical fibers with infinite and finite cladding thickness and the formation of the supermodes due to the coupling between the surface-plasmon modes in the presence of different surrounding materials are also investigated.
14 citations
01 Nov 2006
TL;DR: A novel architecture that integrates 3GPP UMTS mobile technology with Web services is proposed that will help address authentication and privacy concern within eHealth environment.
Abstract: There are many advantages to deploying mobile devices in eHealth systems. However; security is still an issue: in particular authentication and user privacy. In this paper we propose a novel architecture that integrates 3GPP UMTS mobile technology with Web services. This will help address authentication and privacy concern within eHealth environment. The architecture makes use of the Generic Authentication Architecture from the 3GPP and the Single Sign-On system to authenticate mobile users to a Health Authentication Server to give access to various eHealth Service Providers. The Platform for Privacy Preferences Project is thus used to manage privacy in the system.
8 citations
04 Dec 2006
TL;DR: This paper gives an architectural solution where Mobile Operators play the role of Trusted Third Parties supplying service credentials that allow a co-located 3GPP network application function and liberty-enabled identity provider entity to implement a controlled shopping mall service to mobile stations from multiple trust domains.
Abstract: In this paper we present a platform for the direct consumption of web services by a Mobile Station. We give an architectural solution where Mobile Operators play the role of Trusted Third Parties supplying service credentials that allow a co-located 3GPP Network Application Function and Liberty-enabled Identity Provider entity to implement a controlled Shopping Mall service to Mobile Stations from multiple trust domains. We consider both the protocol and the structure and syntax of the various tokens required to minimise service latency over the bandwidth and performance constrained mobile system, whilst providing adequate security services to protect against the perceived threat model. To validate our proposal we have developed code to create a Web Service test scenario utilising readily available J2ME, Java Card, J2SE and J2EE platforms, Web Services tools from Apache, the KTool- Bar emulator from Sun, and the JCOPS suite of tools for Java Card applet development.
7 citations
18 Oct 2006
TL;DR: In this paper, a finite element-based, rigorous full-vectorial modal solution approach was developed to calculate the effective index of the fundamental space filling mode, the cut-off condition of fundamental and the second guided modes to identify single mode operation ranges for a photonic crystal fiber design.
Abstract: A finite element-based, rigorous full-vectorial modal solution approach has been developed to calculate the effective
index of the fundamental space filling mode, the cut-off condition of the fundamental and the second guided modes to
identify single mode operation ranges for a photonic crystal fiber design. Furthermore, structural asymmetry has been
introduced in the model to maximise the modal birefringence to create a design for polarization maintaining photonic
crystal fiber.
2 citations
18 Oct 2006
TL;DR: In this article, the effects on the modal properties of metal-clad dielectric guides with the cladding thickness and the formation of the supermodes due to the coupling between the surface plasmon modes in the presence of different surrounding materials are investigated.
Abstract: Finite element analysis, based on the vector H-field formulation and incorporating the perturbation technique, is used to calculate the complex propagation characteristics of metal-coated dielectric waveguides at THz frequencies. The propagation and attenuation characteristics of the surface plasmon modes at the metal/dielectric interfaces are presented. The effects on the modal properties of metal-clad dielectric guides with the cladding thickness and the formation of the supermodes due to the coupling between the surface plasmon modes in the presence of different surrounding materials are also investigated.
1 citations
09 Feb 2006
TL;DR: In this paper, the effect of the structural asymmetry and modal confinement on the optimization of the modal birefringence is thoroughly studied and presented in terms of the effective indices and spot-sizes of nonlinear photonic crystal fibers.
Abstract: Modal solutions for photonic crystal fibers (PCFs) with circular air holes in a hexagonal matrix are presented, using a rigorous full-vectorial finite element-based approach. The effective indices, mode field profiles, spot-sizes, modal hybridness, modal birefringence and group velocity dispersion values have been determined for a representative range of PCFs and the results obtained are shown and conclusions drawn. The effect of the structural asymmetry and modal confinement on the optimization of the modal birefringence is also thoroughly studied and presented here. The effect of total power on the effective indices and spot-sizes of nonlinear PCFs is also presented.
1 citations