scholarly journals COOPERATIVE EFFECTS ON OPTICAL FORCES — DICKE'S BULLET

2002 ◽  
Vol 16 (25) ◽  
pp. 3787-3795 ◽  
Author(s):  
P. V. PANAT ◽  
S. V. LAWANDE
Keyword(s):  
Angular Momentum ◽  
Radiation Field ◽  
Bessel Beam ◽  
Coherent Radiation ◽  
Optical Forces ◽  
Radiation Wavelength ◽  
Spatial Profile ◽  
Cooperative Effects

We investigate the cooperative effects on optical forces in a system of N two level atoms confined to a volume of dimension less than λ3, where λ is radiation wavelength and driven by a coherent radiation field with a spatial profile like Laguerre–Gaussian or ideal Bessel beam. We show a dramatic enhancement on optical forces as well as on the angular momentum imparted to the atom by a factor of N2.

EFFECT OF PHASE FLUCTUATIONS OF LASER ON OPTICAL FORCES IN A TWO-LEVEL ATOM

2000 ◽  
Vol 14 (17n18) ◽  
pp. 631-637 ◽  
Author(s):  
S. V. LAWANDE ◽  
P. V. PANAT
Keyword(s):  
Angular Momentum ◽  
Steady State ◽  
Master Equation ◽  
Gaussian Beam ◽  
Laser Field ◽  
Density Operator ◽  
Bessel Beam ◽  
Optical Forces ◽  
Phase Fluctuations ◽  
Level Atom

An effect of phase fluctuations of a driving laser field on dissipative and dipolar forces of two-level atom is considered. The phase fluctuations are treated by a phase diffusion model where phase fluctuations follow Wiener–Levy process. An exact master equation for the relevant density operator is obtained and solved in the steady state. Optical forces are calculated. The effect of phase fluctuations on angular momentum imparted by a Laguerre–Gaussian beam and an ideal Bessel beam to the atom is investigated.

Generating millimeter-wave Bessel beam with orbital angular momentum using reflective-type metasurface inherently integrated with source

2018 ◽  
Vol 112 (14) ◽  
pp. 141901 ◽  
Author(s):  
Yizhu Shen ◽  
Jiawei Yang ◽  
Hongfu Meng ◽  
Wenbin Dou ◽  
Sanming Hu
Keyword(s):  
Angular Momentum ◽  
Millimeter Wave ◽  
Orbital Angular Momentum ◽  
Bessel Beam

Superimposed orbital angular momentum mode of multiple Hankel–Bessel beam propagation in anisotropic non-Kolmogorov turbulence

2016 ◽  
Vol 14 (8) ◽  
pp. 080102-80107 ◽  
Author(s):  
Guanghui Wu Guanghui Wu ◽  
Chuangming Tong Chuangming Tong ◽  
Mingjian Cheng Mingjian Cheng ◽  
and Peng Peng and Peng Peng
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Bessel Beam ◽  
Beam Propagation ◽  
Kolmogorov Turbulence ◽  
Momentum Mode

scholarly journals Be Star Discs: Inflow or Outflow?

2000 ◽  
Vol 175 ◽  
pp. 617-620
Author(s):  
John M. Porter
Keyword(s):  
Angular Momentum ◽  
Magnetic Fields ◽  
Radiation Field ◽  
Accretion Discs ◽  
Momentum Transport ◽  
Angular Momentum Transport ◽  
Stellar Radiation ◽  
Be Star ◽  
Viscous Stresses

AbstractIt is assumed that the dynamics of Be star discs is dominated by the effects of viscous stresses. By examining angular momentum transport in discs, we show that many, if not all observed Be star discs should be accretion discs unless (i) the disc is acted upon by another agent (e.g. magnetic fields or the stellar radiation field), or (ii) the disc cools significantly as it flows outwards.

scholarly journals Accretion-Disk Corona Advected by External Radiation Drag

1998 ◽  
Vol 188 ◽  
pp. 413-414
Author(s):  
Y. Watanabe ◽  
J. Fukue
Keyword(s):  
Angular Momentum ◽  
Radiation Field ◽  
Accretion Disk ◽  
Accretion Disks ◽  
External Radiation ◽  
Radiation Fields ◽  
Almost All ◽  
Strong Radiation ◽  
Radiative Interaction ◽  
Standard Disk

Accretion-disk corona (ADC) is required from observational as well as theoretical reasons. In almost all of traditional studies, however, a stationary corona has been assumed; i.e., the corona gas corotates with the underlying (Keplerian) accretion disk, and the radial motion is ignored. Recently, in the theory of accretion disks a radiative interaction between the gas and the external radiation field has attracted the attention of researchers. In particular the radiation drag between the gas and the external radiation field becomes important from the viewpoint of the angular-momentum removal. We thus examine the effect of radiation drag on the accretion-disk corona above/below the accretion disk (Watanabe, Fukue 1996a, b). We suppose that an accretion disk can be described by the standard disk, and that radiation fields are produced by the central luminous source and the accretion disk, itself. In general an accretion-disk corona under the influence of strong radiation fields dynamically infalls (advected) toward the center.

scholarly journals Lateral chirality-sorting optical forces

2015 ◽  
Vol 112 (43) ◽  
pp. 13190-13194 ◽  
Author(s):  
Amaury Hayat ◽  
J. P. Balthasar Mueller ◽  
Federico Capasso
Keyword(s):  
Wave Propagation ◽  
Angular Momentum ◽  
Field Gradient ◽  
Transverse Component ◽  
Evanescent Waves ◽  
Unusual Property ◽  
Optical Forces ◽  
Spin Angular Momentum ◽  
Absolute Strength ◽  
The Absolute

The transverse component of the spin angular momentum of evanescent waves gives rise to lateral optical forces on chiral particles, which have the unusual property of acting in a direction in which there is neither a field gradient nor wave propagation. Because their direction and strength depends on the chiral polarizability of the particle, they act as chirality-sorting and may offer a mechanism for passive chirality spectroscopy. The absolute strength of the forces also substantially exceeds that of other recently predicted sideways optical forces.

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