N. Yogesh

Bio: N. Yogesh is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Metamaterial & Electromagnetic radiation. The author has an hindex of 1, co-authored 1 publications receiving 3 citations.

Directional cloak formed by photonic crystal waveguides

Abstract: A method to cloak larger dimensional scattering objects against normal incident linearly polarized microwave is reported in this work. The cloaking device utilizes the principle of photonic crystal wave guiding mechanisms that mould and steer the wave path smoothly around the scattering objects. The proposed method is scalable at all length-scales from cm to nm band frequencies. This approach may be employed for the development of microwave photonic components that are aimed for independent and simultaneous electromagnetic wave operations.

Spatial Beam Compression and Effective Beam Injection Using Triangular Gradient Index Profile Photonic Crystals

Abstract: Spatial beam compression of an electromagnetic wave is one of the fundamental techniques employed in microwaves and optics. As there are many ways to achieve this task using the combination of prisms and lenses, recent research suggests the parabolic gradient index photonic crystals (GRIN PC) for the design of spatial beam compressor owing to its functionalities. However, the fabrication of a graded media with the parabolic proflle is a di-cult challenge in practical realization. As an alternative, present work attempts this problem with respect to the triangular gradient index proflle. The performance and aspects of the beam compression are investigated experimentally using the pillar type GRIN PC at the microwave length-scales. The utility of the device for an efiective beam injection to the photonic-waveguide component is further demonstrated experimentally.

Directional Cloaking by Quadruple Luneburg Lens System

Abstract: In this study, we propose a method based on graded-index medium in order to cloak scatterer objects. We use discretized Luneburg lenses as a graded-index medium and the proposed structure consists of four discretized Luneburg lenses, i.e., it is can be considered as a quadruple Luneburg lens system. Numerical investigations for directional cloaking are performed by using finite-difference time-domain methods. It is shown that an object can be cloaked inside the dark zone of created by Luneburg lenses and the proposed structure can provide cloaking at optical wavelengths.