Do evanescent waves really exist in free space?

Katrich, A.B.

doi:10.1016/j.optcom.2005.06.012

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…In this case, the wave E m and target atoms are connected through two Green functions ↔ G (r, R 1 ) and ↔ G (r, R 2 ), which are often expanded into angular spectra to aid the discussion of the evanescent and propagating components of E m in the literature; see [2], for example. Note evanescent waves cannot exist in vacuum alone [22]. Also, see [23] for the formulation of multiple scattering of light in optical diffraction tomography.…”

Section: In the Expression Ofmentioning

confidence: 99%

Effects of back-action on the measurement of a sub-wavelength separation in the near-field region

Guo¹

2011

J. Opt.

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In this work, measurement in the near-field region of a sub-wavelength separation between two atoms is studied when the detector used to perform the measurement is modeled as another atom. Through an analysis of multiple scattering of an incident wave among the atoms, the back-action of the detector on the measurement is examined. It is found that, although the separation can never be measured exactly, the presence of the back-action makes the measurement more accurate. It is also found that the back-action enables the waves observed by the detector to avoid singularities that otherwise exist when the back-action is ignored.

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Section: In the Expression Ofmentioning

confidence: 99%

Effects of back-action on the measurement of a sub-wavelength separation in the near-field region

Guo¹

2011

J. Opt.

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“…One of the directions effectively used to achieve super-resolution is near-field optics [2][3][4][5][6][7][8][9][10][11][12]. Near-field optics study fields near a radiation source or an impact surface, which implies consideration of evanescent waves [13,14]. In this case, there are no restrictions on the size of the light spot-the localization of the laser spot can be arbitrarily small [15][16][17][18][19], but this method is not suitable for optical systems intended to transmit information over significant distances.…”

Section: Introductionmentioning

confidence: 99%

Study of Superoscillating Functions Application to Overcome the Diffraction Limit with Suppressed Sidelobes

Хонина

Ponomareva

Butt

2021

Optics

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The problem of overcoming the diffraction limit does not have an unambiguously advantageous solution because of the competing nature of different beams’ parameters, such as the focal spot size, energy efficiency, and sidelobe level. The possibility to overcome the diffraction limit with suppressed sidelobes out of the near-field zone using superoscillating functions was investigated in detail. Superoscillation is a phenomenon in which a superposition of harmonic functions contains higher spatial frequencies than any of the terms in the superposition. Two types of superoscillating one-dimensional signals were considered, and simulation of their propagation in the near diffraction zone based on plane waves expansion was performed. A comparative numerical study showed the possibility of overcoming the diffraction limit with a reduced level of sidelobes at a certain distance outside the zone of evanescent waves.

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“…Evanescent waves are localized waves that have the property of resisting diffraction in dispersive media, such as potential barriers, even over long distances [1][2][3][4][5][6][7][8]. These non-propagating waves are characterized by imaginary wave vectors [1], and decay exponentially along the direction of propagation within the barrier.…”

Section: Introductionmentioning

confidence: 99%

Evanescent waves and superluminal behavior of matter

Nanni

2019

Int. J. Mod. Phys. A

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An evanescent wave is a non-propagating wave with an imaginary wave vector. In this study, we prove that these are solutions of the tachyon-like Klein-Gordon equation, and that in the tunneling of ultrarelativistic spin-1/2 particles they describe superluminal states arising from interactions between a particle and barrier. These states decay as a particle emerges from the opposite side of a potential barrier, conserving the same initial energy but not necessarily the same mass. The obtained theory is applied to the neutrino, to explain flavor oscillations during free flight and determine the conditions that maximize the probability of their occurrence.

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Do evanescent waves really exist in free space?

Cited by 10 publications

References 12 publications

Effects of back-action on the measurement of a sub-wavelength separation in the near-field region

Effects of back-action on the measurement of a sub-wavelength separation in the near-field region

Study of Superoscillating Functions Application to Overcome the Diffraction Limit with Suppressed Sidelobes

Evanescent waves and superluminal behavior of matter

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