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. © 2012 IEEE.

Venkatachalam Subramanian

Department Of Physics

BAND FREQUENCIES

Linearly polarized

MICROWAVE PHOTONICS

Photonic crystal waveguide

SCATTERING OBJECTS

Integrated optics

Laser optics

metamaterials

Microwave devices

Photonic crystals

MICROWAVES

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Directional cloak formed by photonic crystal waveguides

IEEE MTT-S International Microwave Symposium Digest

A two-dimensional transformational electromagnetic (T-E) device formed by configuring a circular disc with a Fermat spiral is realized. By tuning the phase of the emanating wave in the T-E medium, antenna switching and beam steering are made possible. To simplify the permittivity and permeability tensors of the proposed T-E device, a gradient index approach is employed using purely dielectric material, which is then realized using photonic crystals. The results are verified numerically using full wave simulations. © 2019 Author(s).

Fulltext

AIP Advances

Beam steering based on coordinate transformation of Fermat spiral configurations

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 profile is a difficult challenge in practical realization. As an alternative, present work attempts this problem with respect to the triangular gradient index profile. 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 effective beam injection to the photonic-waveguide component is further demonstrated experimentally.

Progress in Electromagnetics Research

Spatial beam compression and effective beam injection using triangular gradient index profile photonic crystals

Photonic Crystals

Journal of Applied Physics

Self-focusing media using graded photonic crystals: Focusing, Fourier transforming and imaging, directive emission, and directional cloaking

Beam aperture modifier and beam deflector using gradient-index photonic crystals

Physics and Applications of Negative Refractive Index Materials

Journal	IEEE MTT-S International Microwave Symposium Digest
ISSN	0149645X
Open Access	No