Power circulation via negative energy-flux wormholes in optical nanowaveguides

Mokhov, Sergiy; El‐Ganainy, Ramy; Christodoulides, Demetrios N.

doi:10.1364/oe.14.003255

Cited by 15 publications

(17 citation statements)

References 14 publications

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“…(B7) and (B8) that, for TM modes, the axial component S z of the Poynting vector is positive with respect to the direction of propagation, in agreement with the results of Ref. [44].…”

Section: Tm Modessupporting

confidence: 91%

Higher-order modes of vacuum-clad ultrathin optical fibers

et al. 2017

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We present a systematic treatment of higher-order modes of vacuum-clad ultrathin optical fibers. We show that, for a given fiber, the higher-order modes have larger penetration lengths, larger effective mode radii, and larger fractional powers outside the fiber than the fundamental mode. We calculate, both analytically and numerically, the Poynting vector, propagating power, energy, angular momentum, and helicity (or chirality) of the guided light. The axial and azimuthal components of the Poynting vector can be negative with respect to the direction of propagation and the direction of phase circulation, respectively, depending on the position, the mode type, and the fiber parameters. The orbital and spin parts of the Poynting vector may also have opposite signs in some regions of space. We show that the angular momentum per photon decreases with increasing fiber radius and increases with increasing azimuthal mode order. The orbital part of angular momentum of guided light depends not only on the phase gradient but also on the field polarization, and is positive with respect to the direction of the phase circulation axis. Meanwhile, depending on the mode type, the spin and surface parts of angular momentum and the helicity of the field can be negative with respect to the direction of the phase circulation axis.Comment: 24 pages, 22 figure

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“…(B7) and (B8) that, for TM modes, the axial component S z of the Poynting vector is positive with respect to the direction of propagation, in agreement with the results of Ref. [44].…”

Section: Tm Modessupporting

confidence: 91%

Higher-order modes of vacuum-clad ultrathin optical fibers

et al. 2017

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“…Our additional numerical calculations which are not shown here confirm the result of Ref. [60] that the axial component S z may become negative when the refractive index n 1 of the fiber is large enough (n 1 /n 2 > 2.71). However, we are not interested in such high-index fibers.…”

Section: Quasicircularly Polarized Nanofiber-guided Light Fieldsupporting

confidence: 84%

“…We observe that, outside the fiber, for our parameters, the spin part S spin outside the fiber may exceed that of the positive orbital part S orb z . In this case, the axial component S z becomes negative [60]. A similar situation occurs in the case of Bessel beams [64].…”

Section: Quasicircularly Polarized Nanofiber-guided Light Fieldmentioning

confidence: 57%

Negative azimuthal force of nanofiber-guided light on a particle

Kien

Rauschenbeutel

2013

Phys. Rev. A

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We calculate the force of a quasicircularly polarized guided light field of a nanofiber on a dielectric spherical particle. We show that the orbital parts of the axial and azimuthal components of the Poynting vector are always positive while the spin parts can be either positive or negative. We find that, for appropriate values of the size parameter of the particle, the azimuthal component of the force is directed oppositely to the circulation direction of the energy flow around the nanofiber. The occurrence of such a negative azimuthal force indicates that the particle undergoes a negative torque.

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“…For example‐ at z = 1500 nm, the force is still negative but the total Poynting vector is positive everywhere just like at z = 500 nm where the force is positive. So, the conclusion is that: negative Poynting vector is not responsible for such optical pulling force in general.…”

Section: Detailed Analysis Of Set‐upmentioning

confidence: 96%

“…It is interesting to note that the real part of E z is found in opposite phase after each 500‐nm z ‐distance. Another interesting fact is that the Poynting vector direction at z = 1000 nm plane is negative for the air core, which is discussed in detailed in . However, it is not the generic reason of optical pulling force outside the waveguide .…”

Section: Detailed Analysis Of Set‐upmentioning

confidence: 99%

Lorentz force and the optical pulling of multiple rayleigh particles outside the dielectric cylindrical waveguides

et al. 2016

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The stimulating connection between the counter-intuitive optical pulling effects and the Lorentz force has not been investigated in literature. This work demonstrates that multiple absorbing or non-absorbing dielectric Rayleigh objects can be pulled locally with gradientless travelling waves outside a finite-sized cylindrical nano or micro waveguide, if it is made up of a hollow core along with the cladding of at least two different dielectrics of appropriate refractive indices. Lorentz force analysis reveals that the bound surface charges of Rayleigh scatterer experience backward force, which overcomes the positive bulk force and ultimately results in the net pulling of the scatterer for several spatial regions outside the waveguide. Finally, in order to control the pulling of multiple Rayleigh particles based on scattering force and binding force, we have proposed a possible cylindrical coupler set-up. This work may open a new window of optical pulling force due to the exclusion of conventional structured tractor beams along with the artificial exotic matters.

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Power circulation via negative energy-flux wormholes in optical nanowaveguides

Cited by 15 publications

References 14 publications

Higher-order modes of vacuum-clad ultrathin optical fibers

Higher-order modes of vacuum-clad ultrathin optical fibers

Negative azimuthal force of nanofiber-guided light on a particle

Lorentz force and the optical pulling of multiple rayleigh particles outside the dielectric cylindrical waveguides

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