Manoj Kumar Shah

• Doctor of Philosophy
• Postdoctoral Fellow at University of Arkansas at Pine Bluff

Photonic integrated circuits (PICs) have been acknowledged as the promising platforms for the applications in data communication, Lidar in autonomous driving vehicles, innovative sensor technology, etc. Since the demonstration of optical components individually, integration of both electronics and photonics for functional devices on a common platfo...

This work focuses on engineering magnetism in magneto-optical materials M P X 3 by substitution and intercalation, which reveals efficient tuning of magnetic interactions and anisotropies. Such tunable magnetism provides platforms for novel photonic processes in layered magnets.

Group III-V materials on sapphire substrate opens a new avenue for photonics integrated circuits. GaAs/AlGaAs straight waveguides on sapphire substrate were numerically studied. The propagation loss, single-mode, and multi-mode operation conditions were reported.

The back-reflection of emitted laser beam (optical feedback, also know as selfmixing ) from various external interfaces are sufficient to cause instability, and prohibiting its use in various fields such as communication, spectroscopy, imaging to name a few. So it is desirable to study the laser dynamics and the conditions causing it to be stable i...

The balance between extinction ratio and insertion loss is stringent conditionwhilerealizingefficient optical modulators with higher figure-of-merit (FOM), lower power consumption and wider modulation bandwidth. The higher value of FOM is associated with the requirement of larger extinction ratio and smaller insertion loss.In the model presented he...

We report on the fiber-optic polarization-intensive optical modulator architecture by transferring Al/HfO2/ITO/ HfO2 stack around the core region of the D-fiber. The proposed modulator is capable of offering extinction ratio (ER) as high as 23.71 dB and insertion loss (IL) as low as 1.01 dB for the transverse electric (TE) mode. Concurrently, for t...

The identical modulating ability between transverse electric, TE, and transverse magnetic, TM, modes is stringent condition while realizing polarization insensitive optical modulators. This in turn incorporates significant compromise in polarization sensitive loss, PSL. In this work, we propose the concept of fiber-optic polarization-insensitive op...

A polarization independent graphene-based electro- absorption optical modulator concept is presented. The device is based on a slanted silicon stripe upon which two graphene flakes reside, on this surface another silicon waveguide is capped, forming a rectangular silicon-graphene waveguide (SGW). Simulation results show that effective mode index of...

We report on an electro-absorption optical modulator using graphene-on-D-microfiber configuration. Two-lamellae of graphene embedded in the dielectric spacer are incorporated with side polished microfiber to enhance the graphene-light interaction efficiency measured in terms of effective mode index change. The effects of side polished microfiber to...

A high-speed optical phase modulator based on graphene-silicon waveguide (GSW) is presented. Two graphene flakes, sandwiched by insulating dielectric spacers, are embedded in a silicon waveguide to enhance the interaction between the graphene and light. By applying a bias on the graphene flakes, the refractive index variation of TE mode in the wave...

The microscopic effect of the exchange interaction parameter for the 2-Dimensional ising model with nearest neighbor interaction has been studied. By supposing simple temperature dependent relationship for the exchange parameter, graphs were straightforwardly obtained that show the reentrant closed looped phase diagrams symptomatic of some colloids...