Zahurul Islam

Proposition and Numerical Analysis of a Plasmonic Sensing Structure of Metallo-Dielectric Grating and Silver Nano-slabs in a Metal-Insulator-Metal Configuration

We propose and numerically investigate a near-infrared surface plasmon resonance-based refractive index sensor having in unison an extremely high sensitivity (1719 nm/RIU) and transmission efficiency (91.73%) with a high figure of merit (39.81). The proposed sensor structure, consisting of a 1D metallo-dielectric grating of silver and rectangular-shaped silver nano-slabs in a metal-insulator-metal configuration, excites both propagating surface plasmon polaritons and localized surface plasmon polaritons producing highly improved spectral response. Using the finite-difference time-domain computation method, the spectral characteristics were analyzed and some important sensing performances, such as sensitivity, transmission efficiency, full-width at half-maximum, and figure of merit, were optimized through numerical simulations as a function of the shape and size of the nanostructures. As a specific application, the proposed structure was also investigated for temperature sensing application and its temperature sensitivity is found to be much better than the state-of-the-art. The proposed sensor structure may have monumental applications in such areas as biomedical and environmental sensing applications and photonic integrated circuits.

On numerical evaluation of theH-functions of transport problems by kernel approximation for the albedo 0<ω≤1

AbstractDas Gupta represented theH-functions of transport problems for the albedo ω∈[0, 1] in the formH(z)=R(z)−S(z) (see Das Gupta, 1977) whereR(z) is a rational function ofz andS(z) is regular on [−1, 0]c. In this paper we have representedS(z) through a Fredholm integral equation of the second kind with a symmetric real kernelL(y, z) as

Corrigendum on numerical evaluation of H-functions of transfer problems in multiplying media: Astrophysics and Space Science72, 71, 1980

S(z) = f(z) - \int_0^1 {L(y,{\text{ }}z)S(y){\text{ d}}y}

A High-Performance Plasmonic Nanosensor Based on an Elliptical Nanorod in an MIM Configuration

. The problem is then solved as an eigenvalue problem. The kernel is converted into a degenerate kernel through finite Taylors expansion and the integral equation forS(z) takes the form:

Plasmonic solar cell with annular apertures and Ag grating supporting fabry-perot modes

S(z) = f(z) - \sum\nolimits_{i - 1}^N {{\text{ }}\chi _i \int_0^1 {F_i (z)F_i (y)S(y){\text{ d}}y} }

Variation of Seepage Loss over Time in the Lined and Unlined Canals of the Teesta Barrage Project

(which is solved by the usual procedure) where χrs are the discrete eigenvalues andFrs the corresponding eigenfunctions of the real symmetric kernelL(y, z).