On the propagating and evanescent waves associated to azimuthally-polarized nonparaxial fields

2012 ◽  
Author(s):  
Rosario Martínez-Herrero ◽  
Pedro M. Mejías ◽  
Ignasi Juvells ◽  
Artur Carnicer
Keyword(s):  
Evanescent Waves

Self-referencing SPR-biosensors based on penetration difference of evanescent waves

2011 ◽  
Vol 28 (1) ◽  
pp. 263-269 ◽  
Author(s):  
Shavkat Nizamov ◽  
Vladimir M. Mirsky
Keyword(s):  
Evanescent Waves

UV laser-assisted multiple evanescent waves lithography for near-field nanopatterning

2009 ◽  
Vol 4 (4) ◽  
pp. 210-214 ◽  
Author(s):  
J.K. Chua ◽  
V.M. Murukeshan
Keyword(s):  
Near Field ◽  
Evanescent Waves ◽  
Uv Laser

scholarly journals A Method for Fabricating Arrays of Nanopatterns with the Feature Size beyond Diffraction Limit

2008 ◽  
Vol 2008 ◽  
pp. 1-4 ◽  
Author(s):  
Shuhong Li ◽  
Lifang Shi ◽  
Xiaochun Dong ◽  
Chunlei Du ◽  
Yudong Zhang
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Diffraction Limit ◽  
Evanescent Waves ◽  
The Other ◽  
Optical Intensity ◽  
Polystyrene Spheres ◽  
Feature Size ◽  
Contact Points ◽  
Difference Time

A convenient lithographic technique is proposed in this paper, which can be used to produce subdiffraction-limit arrays of nanopatterns over large areas (about several square centimeters). An array of polystyrene spheres (PS) is arranged on the surface of a layer of silver which has a thickness of about tens of nanometers. With the normal illumination light of wavelength 365 nm perpendicular to the substrate, PS can generate an array of optical patterns with high intensity at their contact points with silver. By designing the silver slab, the evanescent waves that carry subwavelength information about the optical patterns are substantially enhanced, while propagating components are restrained. In the photoresist which is on the other side of silver, the optical intensity is redistributed and subdiffraction-limit patterns are obtained after exposure and development. Simulation by finite-difference time-domain (FDTD) and experiments were carried out to verify the technique. The results show that by using PS with diameter of 600 nm, nanopatterns with dimension of less than 80 nm can be obtained.

Optical guidance of neutral atoms using evanescent waves in a cylindrical-core hollow fiber: theoretical approach

1995 ◽  
Vol 61 (1-4) ◽  
pp. 91-97 ◽  
Author(s):  
Haruhiko Ito ◽  
Keiji Sakaki ◽  
Takeshi Nakata ◽  
Wonho Jhe ◽  
Motoichi Ohtsu
Keyword(s):  
Hollow Fiber ◽  
Theoretical Approach ◽  
Evanescent Waves ◽  
Neutral Atoms

scholarly journals SPECIAL RELATIVITY AND SUPERLUMINAL MOTIONS: A DISCUSSION OF SOME RECENT EXPERIMENTS

2000 ◽  
Vol 15 (18) ◽  
pp. 2793-2812 ◽  
Author(s):  
ERASMO RECAMI ◽  
FLAVIO FONTANA ◽  
ROBERTO GARAVAGLIA
Keyword(s):  
Special Relativity ◽  
Group Velocity ◽  
Maxwell Equations ◽  
Evanescent Waves ◽  
Experimental Results ◽  
Relativistic Causality ◽  
Causal Paradox ◽  
Faster Than Light

Some experiments, performed at Berkeley, Cologne, Florence, Vienna, Orsay and Rennes led to the claim that something seems to travel with a group velocity larger than the speed c of light in vacuum. Various other experimental results seem to point in the same direction: For instance, localized wavelet-type solutions of Maxwell equations have been found, both theoretically and experimentally, that travel with Superluminal speed. Even muonic and electronic neutrinos — it has been proposed — might be "tachyons," since their square mass appears to be negative. With regard to the first-mentioned experiments, it was very recently claimed by Guenter Nimtz that those results with evanescent waves or "tunneling photons" — implying Superluminal signal and impulse transmission — violate Einstein causality. In this note, on the contrary, we want to stress that all such results do not place relativistic causality in jeopardy, even if they refer to actual tachyonic motions: In fact, special relativity can cope even with Superluminal objects and waves. For instance, it is possible (at least in microphysics) to solve also the known causal paradoxes, devised for "faster than light" motion, even if this is not widely recognized. Here we show, in detail and rigorously, how to solve the oldest causal paradox, originally proposed by Tolman, which is the kernel of many further tachyon paradoxes. The key to the solution is a careful application of tachyon mechanics, as it unambiguously follows from special relativity.

scholarly journals Subwavelength focusing of light without evanescent waves by an array of nanoholes

2007 ◽  
Author(s):  
Fu Min Huang ◽  
Yifang Chen ◽  
F. Javier Garcia de Abajo ◽  
Nikolay Zheludev
Keyword(s):  
Evanescent Waves

scholarly journals Deep Subwavelength Power Concentration-Based Hyperbolic Metamaterials

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Amanpreet Kaur ◽  
Saptarshi Banerjee ◽  
Wangshi Zhao ◽  
Jayanti Venkataraman ◽  
Zhaolin Lu
Keyword(s):  
Electromagnetic Waves ◽  
Light Propagation ◽  
Spot Size ◽  
Diffraction Limit ◽  
Evanescent Waves ◽  
Hyperbolic Metamaterials ◽  
Preferred Direction ◽  
Propagating Waves ◽  
Medium Design ◽  
Collimated Beam

Hyperbolic metamaterials can manipulate electromagnetic waves by converting evanescent waves into propagating waves and thus support light propagation without diffraction limit. In this paper, deep subwavelength focusing (or power concentration) is demonstrated both numerically and experimentally using hyperbolic metamaterials. The results verify that hyperbolic metamaterials can focus a broad collimated beam to spot size of ~λ0/6 using wired medium design for both normal and oblique incidence. The nonmagnetic design, no-cut-off operation, and preferred direction of propagation in these materials significantly reduce the attenuation in electromagnetic waves.

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