The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Stefano Maci - One of the best experts on this subject based on the ideXlab platform.
-
exact solution for the protected tem edge mode in a ptd Symmetric parallel plate waveguide
IEEE Transactions on Antennas and Propagation, 2019Co-Authors: Enrica Martini, Mario G Silveirinha, Stefano MaciAbstract:A parity time-reversal duality Symmetric Structure constituted by a perfect electric conductor and perfect magnetic conductor (PMC) parallel plate waveguide is analyzed. This waveguide supports unimodal transverse electromagnetic (TEM) edge mode propagation protected against backscattering from a certain class of deformations and defects. The TEM solution is found in analytical form by using three different methods, namely, conformal mapping, mode-matching, and Fourier-transform methods. It is shown through numerical simulations that the mode propagation is robust with respect to deformations such as 90° bends and discontinuities such as transition to free space. Implementation of the PMC boundary conditions via both a bed of nails and a mushroom Structure is also successfully investigated.
-
exact solution for the protected tem edge mode in a ptd Symmetric parallel plate waveguide
arXiv: Classical Physics, 2018Co-Authors: Enrica Martini, Mario G Silveirinha, Stefano MaciAbstract:A Parity Time-reversal Dual (PTD) Symmetric Structure constituted by a Perfectly-Electric-Perfectly magnetic (PEC-PMC) parallel plate waveguide (PPW) is analyzed. This waveguide supports unimodal transverse electromagnetic (TEM) edge mode propagation protected against back-scattering from a certain class of deformations and defects. The TEM solution is found in analytical form by using three different methods, namely conformal mapping, mode-matching, and Fourier-transform methods. It is shown through numerical simulations that the mode propagation is robust with respect to deformations such as 90{\deg} bends and discontinuity such as transition to free-space. Implementation of the PMC boundary conditions via both a bed of nails and a mushroom Structure is also successfully investigated.
Enrica Martini - One of the best experts on this subject based on the ideXlab platform.
-
exact solution for the protected tem edge mode in a ptd Symmetric parallel plate waveguide
IEEE Transactions on Antennas and Propagation, 2019Co-Authors: Enrica Martini, Mario G Silveirinha, Stefano MaciAbstract:A parity time-reversal duality Symmetric Structure constituted by a perfect electric conductor and perfect magnetic conductor (PMC) parallel plate waveguide is analyzed. This waveguide supports unimodal transverse electromagnetic (TEM) edge mode propagation protected against backscattering from a certain class of deformations and defects. The TEM solution is found in analytical form by using three different methods, namely, conformal mapping, mode-matching, and Fourier-transform methods. It is shown through numerical simulations that the mode propagation is robust with respect to deformations such as 90° bends and discontinuities such as transition to free space. Implementation of the PMC boundary conditions via both a bed of nails and a mushroom Structure is also successfully investigated.
-
exact solution for the protected tem edge mode in a ptd Symmetric parallel plate waveguide
arXiv: Classical Physics, 2018Co-Authors: Enrica Martini, Mario G Silveirinha, Stefano MaciAbstract:A Parity Time-reversal Dual (PTD) Symmetric Structure constituted by a Perfectly-Electric-Perfectly magnetic (PEC-PMC) parallel plate waveguide (PPW) is analyzed. This waveguide supports unimodal transverse electromagnetic (TEM) edge mode propagation protected against back-scattering from a certain class of deformations and defects. The TEM solution is found in analytical form by using three different methods, namely conformal mapping, mode-matching, and Fourier-transform methods. It is shown through numerical simulations that the mode propagation is robust with respect to deformations such as 90{\deg} bends and discontinuity such as transition to free-space. Implementation of the PMC boundary conditions via both a bed of nails and a mushroom Structure is also successfully investigated.
Xiang Zhang - One of the best experts on this subject based on the ideXlab platform.
-
single mode laser by parity time symmetry breaking
Science, 2014Co-Authors: Liang Feng, Zi Jing Wong, Yuan Wang, Xiang ZhangAbstract:Effective manipulation of cavity resonant modes is crucial for emission control in laser physics and applications. Using the concept of parity-time symmetry to exploit the interplay between gain and loss (i.e., light amplification and absorption), we demonstrate a parity-time symmetry-breaking laser with resonant modes that can be controlled at will. In contrast to conventional ring cavity lasers with multiple competing modes, our parity-time microring laser exhibits intrinsic single-mode lasing regardless of the gain spectral bandwidth. Thresholdless parity-time symmetry breaking due to the rotationally Symmetric Structure leads to stable single-mode operation with the selective whispering-gallery mode order. Exploration of parity-time symmetry in laser physics may open a door to next-generation optoelectronic devices for optical communications and computing.
-
single mode laser by parity time symmetry breaking
Science, 2014Co-Authors: Liang Feng, Zi Jing Wong, Yuan Wang, Xiang ZhangAbstract:Effective manipulation of cavity resonant modes is crucial for emission control in laser physics and applications. Using the concept of parity-time symmetry to exploit the interplay between gain and loss (i.e., light amplification and absorption), we demonstrate a parity-time symmetry–breaking laser with resonant modes that can be controlled at will. In contrast to conventional ring cavity lasers with multiple competing modes, our parity-time microring laser exhibits intrinsic single-mode lasing regardless of the gain spectral bandwidth. Thresholdless parity-time symmetry breaking due to the rotationally Symmetric Structure leads to stable single-mode operation with the selective whispering-gallery mode order. Exploration of parity-time symmetry in laser physics may open a door to next-generation optoelectronic devices for optical communications and computing.
Mario G Silveirinha - One of the best experts on this subject based on the ideXlab platform.
-
exact solution for the protected tem edge mode in a ptd Symmetric parallel plate waveguide
IEEE Transactions on Antennas and Propagation, 2019Co-Authors: Enrica Martini, Mario G Silveirinha, Stefano MaciAbstract:A parity time-reversal duality Symmetric Structure constituted by a perfect electric conductor and perfect magnetic conductor (PMC) parallel plate waveguide is analyzed. This waveguide supports unimodal transverse electromagnetic (TEM) edge mode propagation protected against backscattering from a certain class of deformations and defects. The TEM solution is found in analytical form by using three different methods, namely, conformal mapping, mode-matching, and Fourier-transform methods. It is shown through numerical simulations that the mode propagation is robust with respect to deformations such as 90° bends and discontinuities such as transition to free space. Implementation of the PMC boundary conditions via both a bed of nails and a mushroom Structure is also successfully investigated.
-
exact solution for the protected tem edge mode in a ptd Symmetric parallel plate waveguide
arXiv: Classical Physics, 2018Co-Authors: Enrica Martini, Mario G Silveirinha, Stefano MaciAbstract:A Parity Time-reversal Dual (PTD) Symmetric Structure constituted by a Perfectly-Electric-Perfectly magnetic (PEC-PMC) parallel plate waveguide (PPW) is analyzed. This waveguide supports unimodal transverse electromagnetic (TEM) edge mode propagation protected against back-scattering from a certain class of deformations and defects. The TEM solution is found in analytical form by using three different methods, namely conformal mapping, mode-matching, and Fourier-transform methods. It is shown through numerical simulations that the mode propagation is robust with respect to deformations such as 90{\deg} bends and discontinuity such as transition to free-space. Implementation of the PMC boundary conditions via both a bed of nails and a mushroom Structure is also successfully investigated.
M T Pena - One of the best experts on this subject based on the ideXlab platform.
-
electromagnetic form factors of the delta in a s wave approach
Physical Review D, 2009Co-Authors: G Ramalho, M T PenaAbstract:Without any further adjusting of parameters, a relativistic constituent quark model, successful in the description of the data for the nucleon elastic form factors and the dominant contribution to the nucleon to Delta electromagnetic transition, is used here to predict the dominant electromagnetic form factors of the Delta baryon. The model considered is based on a simple Delta wave function corresponding to a quark-diquark system in an S-state. The results for E0 and M1 are consistent both with experimental results and lattice calculations. The remaining form factors M3 and E2 vanishes, given the Symmetric Structure considered for the Delta.
-
electromagnetic form factors of the delta in a s wave approach
arXiv: High Energy Physics - Phenomenology, 2008Co-Authors: G Ramalho, M T PenaAbstract:Without any further adjusting of parameters, a relativistic constituent quark model, successful in the description of the data for the nucleon elastic form factors and of the dominant contribution for the nucleon to Delta electromagnetic transition, is used here to predict the dominant electromagnetic form factors of the Delta baryon. The model is based on a simple Delta wave function corresponding to a quark-diquark system in an S-state. The results for E0 and M1 are consistent both with experimental results and lattice calculations. The remaining form factors E2 and M3 vanish, given the Symmetric Structure taken for the Delta.
