33 citations · 186 across the 25 of their papers we have counts for
25 papers
Modulational instability in -symmetric Bragg grating structures with four-wave mixing
I. Inbavalli, K. Tamilselvan, A. Govindarajan +2
We investigate the dynamics of modulational instability (MI) in -symmetric fiber Bragg gratings with a phenomenon of intermodulation known as four-wave mixing (FWM). Altho…
Unique multistable states in periodic structures with saturable nonlinearity. II. Broken -symmetric regime
S. Vignesh Raja, A. Govindarajan, M. Lakshmanan
In this work, we observe that the -symmetric fiber Bragg gratings (PTFBGs) with saturable nonlinearity (SNL) exhibit ramp-like, mixed, optical multistability (OM) in…
Unique multistable states in periodic structures with saturable nonlinearity. I. Conventional case and unbroken -symmetric regime
S. Vignesh Raja, A. Govindarajan, M. Lakshmanan
In this work, we predict that periodic structures without gain and loss do not exhibit an S-shaped hysteresis curve in the presence of saturable nonlinearity (SNL). Instead, the in…
Soliton molecules in Fermi-Pasta-Ulam-Tsingou lattice: Gardner equation approach
M. Kirane, S. Stalin, R. Arun +1
We revisit the Fermi-Pasta-Ulam-Tsingou lattice (FPUT) with quadratic and cubic nonlinear interactions in the continuous limit by deducing the Gardner equation. Through the Hirota…
Coupled Nonlinear Schrödinger System: Role of Four-Wave Mixing Effect on Nondegenerate Vector Solitons
R. Ramakrishnan, M. Kirane, S. Stalin +1
In this paper, we investigate the role of four-wave mixing effect on the structure of nondegenerate vector solitons and their collision dynamics. For this purpose, we consider the…
Modulational instability in -symmetric Bragg grating structures with saturable nonlinearity
K. Tamilselvan, A. Govindarajan, I. Inbavalli +2
We investigate the nontrivial characteristics of modulational instability (MI) in a system of Bragg gratings with saturable nonlinearity. We also introduce an equal amount of gain…
Effect of interlayer exchange coupling in spin-torque nano oscillator
R. Arun, R. Gopal, V. K. Chandrasekar +1
The dynamics of the magnetization of the free layer in a spin-torque nano oscillator (STNO) influenced by a noncollinear alignment between the magnetizations of the free and pinned…
Inhomogeneous nonlinearity meets -symmetric Bragg structures: Route to ultra-low power steering and peculiar stable states
S. Sudhakar, S. Vignesh Raja, A. Govindarajan +2
In the context of -symmetric fiber Bragg gratings, tailoring the nonlinear profile along the propagation coordinate serves to be a new direction for realizing low-pow…
Bright, dark and breather soliton solutions of the generalized long-wave short-wave resonance interaction system
M. Kirane, S. Stalin, M. Lakshmanan
In this paper, a generalized long-wave short-wave resonance interaction system, which describes the nonlinear interaction between a short-wave and a long-wave in fluid dynamics, pl…
Stabilization of light bullets in nonlinear metamaterial waveguides
A. K. Shafeeque Ali, A. Govindarajan, M. Lakshmanan
In this paper, we carry out a theoretical investigation on the propagation of spatio-temporal solitons (light bullets) in the nonlinear metamaterial waveguides. Our theoretical stu…
Thermal quantum correlations and teleportation under PT-symmetric system
J. Ramya Parkavi, R. Muthuganesan, V. K. Chandrasekar +1
In this article, we exploit the different notions of quantumness measure to understand the properties of the Heisenberg XY model with and without PT-symmetric operation. In the abs…
Low-power optical bistability in -symmetric chirped Bragg gratings with four-wave mixing
S. Sudhakar, S. Vignesh Raja, A. Govindarajan +2
The central theme of this article is the analysis of the usefulness of introducing four-wave mixing or modulation of Kerr nonlinearity in a nonuniform grating structure with gain a…
Nondegenerate bright solitons in coupled nonlinear Schrödinger systems: Recent developments on optical vector solitons
S. Stalin, R. Ramakrishnan, M. Lakshmanan
Nonlinear dynamics of an optical pulse or a beam continue to be one of the active areas of research in the field of optical solitons. Especially, in multi-mode fibers or fiber arra…
Modulation instability induced supercontinuum generation in liquid core suspended photonic crystal fiber with cubic-quintic nonlinearities
A. Sharafali, A. K. Shafeeque Ali, M. Lakshmanan
In this paper, we propose a liquid core suspended photonic crystal fiber (LCSPCF) as a potential waveguide structure for nonlinear applications. We emphasize the dramatic improveme…
Dispersion Managed Generation of Peregrine Solitons and Kuznetsov-Ma Breather in an Optical Fiber
Dipti Kanika Mahato, A. Govindarajan, M. Lakshmanan +1
Optical rogue waves and its variants have been studied quite extensively in the context of optical fiber in recent years. It has been realized that dispersion management in optical…
-channel comb filtering and lasing in -symmetric superstructures
S. Vignesh Raja, A. Govindarajan, A. Mahalingam +1
A comb spectrum generating device based on Bragg grating superstructures with gain and loss is suggested in this paper. It includes a comprehensive analysis of the device formulati…
Modulational instability in non-Kerr photonic Lieb lattice with metamaterials
A. K. Shafeeque Ali, Andrei I. Maimistov, K. Porsezian +2
We present an analysis of modulational instability of diffractionless waves in a face-centered square lattice of waveguides featuring non-Kerr nonlinearity, which are constituted b…
Reviving Modulational Instability with Third-Order Dispersion
K. Tamilselvan, A. Govindarajan, T. Kanna +2
It is well-known that third-order dispersion (TOD) never allows the continuous wave of any nonlinear Schroedinger (NLS) type system to experience modulational instability (MI). Rem…
Phase shifted -symmetric periodic structures
S. Vignesh Raja, A. Govindarajan, A. Mahalingam +1
We report the spectral features of a phase-shifted parity and time ()-symmetric fiber Bragg grating (PPTFBG) and demonstrate its functionality as a demultiplexer in t…
Tunable nonlinear spectra of anti-directional couplers
A. Govindarajan, Boris A. Malomed, M. Lakshmanan
We produce transmission and reflection spectra of the anti-directional coupler (ADC) composed of linearly-coupled positive- and negative-refractive-index arms, with intrinsic Kerr…
Tailoring inhomogeneous -symmetric fiber Bragg grating spectra
S. Vignesh Raja, A. Govindarajan, A. Mahalingam +1
The unique spectral behavior exhibited by a class of non-uniform Bragg periodic structures, namely chirped and apodized fiber Bragg gratings (FBGs) influenced by parity and time re…
Nonlinear nonuniform -symmetric Bragg grating structures
S. Vignesh Raja, A. Govindarajan, A. Mahalingam +1
We explore the consequences of incorporating parity and time reversal () symmetries on the dynamics of nonreciprocal light propagation exhibited by a class of nonunif…
Multifaceted dynamics and gap solitons in -symmetric periodic structures
S. Vignesh Raja, A. Govindarajan, A. Mahalingam +1
We report the role of -symmetry in switching characteristics of a highly nonlinear fiber Bragg grating (FBG) with cubic-quintic-septic nonlinearities. We demonstrate…
Nonlinear anti-directional couplers with gain and loss
A. Govindarajan, Boris A. Malomed, M. Lakshmanan
Following the concept of -symmetric couplers, we propose a linearly coupled system of nonlinear waveguides, made of positive- and negative-index materials, which carr…