Exterior caustics produced in scattering of a diagonally incident plane wave by a circular cylinder: semiclassical scattering theory analysis

Lock, James A.; Adler, Charles L.; Hovenac, Edward A.

doi:10.1364/josaa.17.001846

Cited by 29 publications

(17 citation statements)

References 24 publications

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“…1(c), the electric-field peak emerges from the shadow-side surface of the cylinder as a strong jet-like distribution having a length of ~900 nm (1.8 λ 2 ) and a weakly subdiffraction FWHM intensity waist of ~200 nm (0.4 λ 2 ). The emergence of this jet from the shadow-side surface of the cylinder for n 1 ~ 2 is consistent with previous work on optical caustics 22, 23…”

Section: Initial Identification Of the Photonic Nanojet For A Diesupporting

confidence: 90%

Photonic Nanojets

Heifetz¹,

Kong²,

Sahakian³

et al. 2009

Jnl of Comp & Theo Nano

364

265

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This paper reviews the substantial body of literature emerging since 2004 concerning photonic nanojets. The photonic nanojet is a narrow, high-intensity, non-evanescent light beam that can propagate over a distance longer than the wavelength λ after emerging from the shadow-side surface of an illuminated lossless dielectric microcylinder or microsphere of diameter larger than λ. The nanojet’s minimum beamwidth can be smaller than the classical diffraction limit, in fact as small as ~λ/3 for microspheres. It is a nonresonant phenomenon appearing for a wide range of diameters of the microcylinder or microsphere if the refractive index contrast relative to the background is less than about 2:1. Importantly, inserting within a nanojet a nanoparticle of diameter dν perturbs the far-field backscattered power of the illuminated microsphere by an amount that varies as dν3 for a fixed λ. This perturbation is much slower than the dν6 dependence of Rayleigh scattering for the same nanoparticle, if isolated. This leads to a situation where, for example, the measured far-field backscattered power of a 3-μm diameter microsphere could double if a 30-nm diameter nanoparticle were inserted into the nanojet emerging from the microsphere, despite the nanoparticle having only 1/10,000th the cross-section area of the microsphere. In effect, the nanojet serves to project the presence of the nanoparticle to the far field. These properties combine to afford potentially important applications of photonic nanojets for detecting and manipulating nanoscale objects, subdiffraction-resolution nanopatterning and nanolithography, low-loss waveguiding, and ultrahigh-density optical storage.

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Section: Initial Identification Of the Photonic Nanojet For A Diesupporting

confidence: 90%

Photonic Nanojets

Heifetz¹,

Kong²,

Sahakian³

et al. 2009

Jnl of Comp & Theo Nano

364

265

View full text Add to dashboard Cite

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“…[16][17][18][19] However, no further investigation has been reported to authenticate this hypothesis. In this study, the enhancement factor of Raman signals, in the order as high as 10 4 , was realized using closely packed silica spherical microparticles.…”

Section: Introductionmentioning

confidence: 96%

Enhanced Raman scattering by self-assembled silica spherical microparticles

Wang

et al. 2007

Journal of Applied Physics

130

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A technique was developed to achieve enhanced Raman scattering of the silicon photon modes using closely packed micro-and submicron silica spherical particles. Investigation on the particle-size dependence of Raman enhancement revealed that the strongest enhancement occurs when the particle diameter is equal to the spot size of the incident laser beam. Calculations using the OPTIWAVE™ software based on the finite difference time domain algorithm under the perfectly matched layer boundary conditions were carried out. The results showed that photonic nanojets are formed in the vicinity outside the particles along the propagation direction of incident light. It was found that the nanojets are confined to a length of 100 nm with a waist of 120 nm. The presence of the strongly localized electromagnetic fields within the nanojets accounts for the enhanced Raman scattering. This technique has potential applications both in modern and traditional areas of surface science such as surface oxidation, adhesion, corrosion, and catalytic processes, and many other areas in biology, chemistry, materials science, and microelectronics.

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“…The theoretical m ϭ 0 Fourier coefficient contains the 1.58% and 1.47% near-zone correction of Ref. 19 for the experimental r͞a ratios for the two rods and differs from the experimental m ϭ 0 coefficient by 35.6% and 5.7%, respectively. We do not know the reason for the large difference between the m ϭ 0 coefficients for the 8.05-mm rod.…”

Section: P ϭ 2 Supernumeraries Of the 244-mm-radius Glass Rodmentioning

confidence: 70%