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In this contribution, we explore the generation and manipulation of topological singularities of vortex fields in order to shape and rotate the radiation pattern of patch antennas. We first extend at microwaves a result already obtained at optical frequencies for which, by superimposing a constant background on a vortex field, one can modify at will the position of its phase singularity. Then, we...
We provide a brief introduction to supersymmetric photonics and present our newest theoretical findings and experimental results on SUSY mode conversion and the scattering dynamics of light propagating in optical SUSY partner structures. Finally, we show how these notions can be harnessed in a SUSY-inspired extension of transformation optics, enabling the substitution of high-refractive-index arrangements...
Wavelength tuning in a single mode parity-time (PT) symmetric semiconductor microring laser is demonstrated. Stable continuous tuning over a spectral range of 4 nm has been obtained at telecom wavelengths by adjusting the ambient temperature.
A semiconductor microring laser based on a dark state configuration is demonstrated. Single mode lasing is achieved by judiciously exploiting non-Hermitian exceptional points.
Single-transverse mode lasing is demonstrated in a broad-area PT-symmetric semiconductor microring arrangement. The proposed scheme is versatile, robust to fabrication errors, and allows for high brightness operation while maintaining spectral purity.
Parity-time (PT) symmetry has been recently emerged as a new paradigm for mode management in micro-cavity lasers. Single-mode lasing is demonstrated in longitudinally and transversely multi-moded PT-symmetric micro-ring arrangements.
We propose a novel class of large-area single-mode semiconductor lasers in which notions from parity-time symmetry is employed to reliably suppress higher-order modes. The feasibility of our design is investigated in InGaAsP quantum-well arrangements.
We study light propagation in disordered modulated Bloch arrays. For the specific system under consideration, our analysis predicts a 5 fold enhancement in light localization over that expected from a corresponding uniform lattice.
We study the light propagation in z-varying local parity-time symmetric coupled systems. We show that, unlike their conventional counterparts, our analysis predicts a peculiar unidirectional phase exchange.
In this paper, photonic cavities made of point defects in 2-D photonic crystals are modeled by finite-size transmission lines terminated at both ends by appropriate scalar impedances. The proposed model forms a simple transmission line resonator and is demonstrated to be quite beneficial in fast extraction of resonant frequency, quality factor, and mode profile of such photonic cavities. In this manner,...
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