Monika Rajput

Nonlinear pulse propagation in chalcogenide As 2 Se 3 glass photonic crystal fiber using RK4IP method

Pulse propagation through chalcogenide As(2)Se(3) glass photonic crystal fiber (PCF) is numerically investigated using fourth-order Runge-Kutta in the interaction picture (RK4IP) method. The fully vectorial effective index method (FVEIM) is used to calculate the variation of effective refractive index, effective area, dispersion, and nonlinear coefficient (γ) in As(2)Se(3) PCF with wavelength for different values of pitch and air hole size. The RK4IP method is used to demonstrate the soliton propagation, self-phase modulation (SPM), soliton collision and cross phase modulation (XPM) in the designed As(2)Se(3) PCF. The numerically obtained value of soliton collision length (L(col)=51.3L(D)) using the RK4IP method is found to be in good agreement with the theoretical value of soliton collision length (L(col)=51.408L(D)) obtained from inverse scattering transform method, thus providing a verification of the RK4IP accuracy in solving generalized nonlinear schrödinger equation (GLNSE). We also evaluate and apply the value of wavelength for distortionless (L(NL)=L(D)) propagation of the soliton pulse.

Negative refraction in visible region using nano-structured metallo-dielectric photonic crystal

An artificial engineered structure of nano-inclusion made of metallic nano-rods embedded in a dielectric (ε=12.96) matrix with hexagonal arrangement is proposed. New improved designed structure exhibits Negative Refraction (NR) in visible region by using surface plasmon wave in metallo-dielectric photonic crystal operating in a dispersion regime with anti-parallel refracted wave vector and Poynting vector. Finite Difference Time Domain (FDTD) simulations are carried out to study the reflection and transmission properties and obtained Far-field pattern. Designed structure gives NR with high transmission and act as a filter with a quality factor ≈ 102 with strong application potential in nano-optics and nano-technology.

Numerical demonstration of soliton dynamics in chalcogenide As2Se3 glass photonic crystal fiber

In this paper, soliton pulse generation and collision in chalcogenide As2Se3 glass Photonic Crystal Fiber (PCF) is numerically studied using our own algorithm developed for Fourth-Order Runge-Kutta in the Interaction Picture (RK4IP) method. The numerically obtained value of soliton collision length is found to be in good agreement with the theoretical value obtained by the inverse scattering transform, thus providing a verification of the accuracy of the method in solving Generalized Nonlinear Schrödinger Equation (GNLSE). We also calculate the value of wavelength for least distortion for soliton optical pulses.

Influence of structures modification on left-handed plasmonic antenna for green light: from isotropic to chiral

Dispersion and resonance properties of double nanorod structure, ring structure, H structure and chair type structure is demonstrated. With some structural modification, the properties of the structure changes from isotropic to uni-axial anisotropic and further to chiral left-handed material. The Demonstration of near-field transmission spectrum reveals the production of the local-field enhancement up to 102 for the green light. Negative real values of both permeability (μ) and permittivity (ε) for visible light are obtained by applying coupled dipole approximation. The structure modification exhibits some unique dispersion and resonant properties that may govern imaging applications.

Photonic crystal based polarization beam splitter utilizing the phenomenon of negative refraction

A design of polarization beam splitter based on negative refraction in photonic crystal is proposed. The proposed structure is formed by a hexagonal lattice of embedded air holes in silicon materials and is based on 2-D photonic band structure and equi-frequency contour calculations where negative refraction is considered to be function of incident angle and thickness of slab. The designed structure exhibits oppositely signed (negative and positive) refraction for TE and TM polarization at telecom wavelength windows. The wavelength response of the designed PBS is obtained for both polarizations.

Slow Light Nonlinear Photonic Crystal Channel Waveguide as an All-Optical Switch

The effect of slow light on nonlinear effects in photonic crystal and increased induced phase shift produced by lower group velocities is used to decrease the size and power requirements needed to operate optical switches

Numerical analysis of Soliton Propagation in Highly Nonlinear Photonic Crystal Fiber

In this paper soliton pulse generation, soliton collision and Cross Phase modulation in chalcogenide As2Se3 glass Photonic Crystal Fiber is numerically studied using Fourth-Order Runge-Kutta in the Interaction Picture method.

Imaging for blue light

Design of left-handed plasmonic lens is presented for focusing of blue light using dispersion engineering and numerical analysis. Values of permeability and permittivity calculated by applying discrete dipole approximation.

Analysis and Comparison of Dispersion Properties of Hexagonal and Square Lattice Photonic Crystal Fiber

In this paper, we compare the dispersion properties (flattened, zero and negative dispersion) and effective area in hexagonal and square lattice PCF with different hole-to-hole spacing (Λ) and air hole diameter (d) by using Fully Vectorial Effective Index Method (FVEIM). The analysis is carried out in wavelength range from 1.3 µm to 1.6 µm. We also use plane wave expansion method for comparison of effective cladding index in both above lattices.

Study of Self Phase Modulation in Chalcogenide Glass Photonic Crystal Fiber

In this paper, Self Phase Modulation (SPM) in chalcogenide As2Se3 glass Photonic Crystal Fiber (PCF) is numerically studied by combining the fully vectorial effective index method (FVEIM) and Split Step Fourier Method (SSFM). The FVEIM is used to calculate the variation of effective refractive index of guided mode (neff), effective area (Aeff), dispersion and non-linear coefficient (γ) with wavelength for different designs of chalcogenide As2Se3 PCF. The FVEIM solves the vector wave equations and SSFM solves non linear Schrödinger Equation (NLSE) for the different designing parameter of As2Se3 PCF. In case of Self Phase Modulation (SPM), spectral width of the obtained output pulse at d/Λ=0.7 is 1.5 times greater than width of the output pulse obtained at d/L=0.3 using SSFM. Thus we can get the desired spectral broadening just by tailoring the design parameters of the PCF.