Angular momentum of low frequency electromagnetic fields

Weber, Horst

doi:10.1016/j.ijleo.2013.02.009

Cited by 3 publications

(2 citation statements)

References 17 publications

(16 reference statements)

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“…Here w represents the complex plane. The inverse of the conformally mapped function [14] in the upper half of the complex w plane is derived by applying Schwarz-Christoffel transformation [30],…”

Section: Model Formulationmentioning

confidence: 99%

Traps induced Greens function based mathematical modeling for BaTiO₃–SrTiO₃ gate stack dual metal GAA MOSFET

Gauba¹,

Pratap²,

Rewari³

et al. 2019

Semicond. Sci. Technol.

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In this paper, an analytical model has been developed to analyze the impact of trap charges on Dual Metal Gate-All-Around (DMGAA) MOSFET with BaTiO 3 -SrTiO 3 epitaxial oxide layer as gate stack using Greens function and conformal mapping. Trap charges have been induced to observe the changes in surface potential, electric field and drain current. To further investigate the impact of trap charges the trap density is varied. This enhances the drain current with high I ON /I OFF ratio. The analytical results so obtained are compared with the simulated data and are in good agreement thus validating the proposed model. It is also proposed that the device can offer high performance, low leakage power along with high gain and is perfect for analog RF applications. It can be concluded that proposed DMGAA MOSFET is a promising device and a suitable replacement for the existing conventional GAA MOSFETs.

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Section: Model Formulationmentioning

confidence: 99%

Traps induced Greens function based mathematical modeling for BaTiO₃–SrTiO₃ gate stack dual metal GAA MOSFET

Gauba¹,

Pratap²,

Rewari³

et al. 2019

Semicond. Sci. Technol.

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show abstract

“…. , M deployed at of discrete points distributed over a certain region in space, thereby approximating, within the limitations and constraints set by the sampling theorem, [216][217][218], the properties of a single, monolithic two-and three-dimensional transducer that samples the field in a continuous manner [9,69,145,[219][220][221][222][223][224][225][226][227][228][229][230][231][232][233][234][235][236][237]. The fact that it is possible to use arrays of conventional linearmomentum antennas (e.g., dipole antennas) to exploit (a subset of approximate) angular momentum modes, does of course not imply that it is necessary to use such arrays.…”

Section: Angular Momentum Transducersmentioning

confidence: 99%

The physics of angular momentum radio

Thidé

Tamburini

2015

2015 1st URSI Atlantic Radio Science Conference (URSI AT-RASC)

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To this day, wireless communications, as well as radio astronomy and other radio science and technology applications, have made predominantly use of techniques built on top of the electromagnetic linear momentum physical layer. As a supplement and/or alternative to this conventional approach, techniques rooted in the electromagnetic angular momentum (moment of momentum) physical layer have been advocated, and promising results from proof-of-concept laboratory and real-world angular momentum wireless and fiber communication experiments were recently reported. A physical observable in its own right, albeit much more sparingly used than other electromagnetic observables such as energy and linear momentum, the angular momentum exploits the rotational symmetry of the electromagnetic field and the rotational (spinning and orbiting) dynamics of the pertinent charge and current densities. Here we present a review of the fundamental physical properties of the electromagnetic angular momentum observable, derived from the fundamental postulates of classical electrodynamics (the Maxwell-Lorentz equations), and put it into its context among the other Poincaré symmetry invariants of the electromagnetic field. The multi-mode quantized character and other physical properties that sets the classical electromagnetic angular momentum apart from the electromagnetic linear momentum are pointed out. We give many of the results both in terms of the electric and magnetic field vectors and in terms of the complex Riemann-Silberstein vector formalism (Majorana-Oppenheimer representation of classical electrodynamics) and discuss formal parallels with first quantization formalism. We introduce generalized and symmetrized extensions of the Jefimenko integral formulas for calculating exact expressions for the electric and magnetic fields directly from arbitrary given electric and/or magnetic source distributions and use them for deriving expressions for the volumetric density of the electromagnetic angular momentum radiated from any given arbitrary localized distribution of charges and currents. Our results generalize earlier results, obtained by other authors for certain specific configurations only, and facilitate the modeling and design of angular momentum transducers. They show that the volume integrated angular momentum density, i.e., the total angular momentum emitted by the sources, always tends asymptotically to a constant when the distance from the source volume tends to infinity, proving that a radiation arrow of time exists also for angular momentum, as it does for linear momentum (the volume integrated Poynting vector). Consequently, angular momentum physics (torque action) offers an alternative or a supplement to linear momentum physics (force action) as a means of transferring information wirelessly over very long distances. This finding opens possibilities for, among other things, a more flexible utilization of the radio frequency spectrum and paves the way for the development of new information transfer techniques. We discuss ...

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OAM Radio – Physical Foundations and Applications of Electromagnetic Orbital Angular Momentum in Radio Science and Technology

Thidé¹,

Tamburini²

2021

Electromagnetic Vortices

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Angular momentum of low frequency electromagnetic fields

Cited by 3 publications

References 17 publications

Traps induced Greens function based mathematical modeling for BaTiO₃–SrTiO₃ gate stack dual metal GAA MOSFET

Traps induced Greens function based mathematical modeling for BaTiO₃–SrTiO₃ gate stack dual metal GAA MOSFET

The physics of angular momentum radio

OAM Radio – Physical Foundations and Applications of Electromagnetic Orbital Angular Momentum in Radio Science and Technology

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Angular momentum of low frequency electromagnetic fields

Cited by 3 publications

References 17 publications

Traps induced Greens function based mathematical modeling for BaTiO3–SrTiO3 gate stack dual metal GAA MOSFET

Traps induced Greens function based mathematical modeling for BaTiO3–SrTiO3 gate stack dual metal GAA MOSFET

The physics of angular momentum radio

OAM Radio – Physical Foundations and Applications of Electromagnetic Orbital Angular Momentum in Radio Science and Technology

Contact Info

Product

Resources

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Traps induced Greens function based mathematical modeling for BaTiO₃–SrTiO₃ gate stack dual metal GAA MOSFET

Traps induced Greens function based mathematical modeling for BaTiO₃–SrTiO₃ gate stack dual metal GAA MOSFET