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27 Dec 2004

Volume 85, Issue 26, pp. 6323-6432

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Appl. Phys. Lett. 85, 6409 (2004); http://dx.doi.org/10.1063/1.1839274 (3 pages)

Peter D. D. Schwindt, Svenja Knappe, Vishal Shah, Leo Hollberg, John Kitching, Li-Anne Liew, and John Moreland
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Single-mode subwavelength waveguide with channel plasmon-polaritons in triangular grooves on a metal surface

D. K. Gramotnev and D. F. P. Pile

Appl. Phys. Lett. 85, 6323 (2004); http://dx.doi.org/10.1063/1.1839283 (3 pages) | Cited 97 times

Online Publication Date: 17 December 2004

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We demonstrate that single-mode operation of a subwavelength plasmonic waveguide in the form of a V-groove on a metal surface can be achieved by adjusting the depth of the groove. Strongly localized channel plasmon-polaritons (CPPs) are shown to propagate in such waveguides. If the groove depth is close to the penetration depth of the fundamental CPP mode, then all higher modes are not supported by the structure, leaving only the fundamental mode propagating in the groove. In this case, propagation distances of fundamental mode ∼10 μm can easily be achieved together with strong subwavelength localization.
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42.82.Et Waveguides, couplers, and arrays
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)

Optical limiting of semiconductor nanoparticles for nanosecond laser pulses

Wenling Jia, Elliot P. Douglas, Fenggi Guo, and Wenfang Sun

Appl. Phys. Lett. 85, 6326 (2004); http://dx.doi.org/10.1063/1.1836871 (3 pages) | Cited 43 times

Online Publication Date: 17 December 2004

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Optical limiting of nanosecond laser pulses at 532 nm has been observed in CdxAg1−xS semiconductor nanoparticles within organic solution of polymeric ionic aggregates. Both free-carrier absorption (FCA) and nonlinear scattering contribute to the optical limiting performance. The optical limiting response of CdS nanoparticles, in the diameter range of 2–9 nm, increases with the increase of particle size. It can be further increased by surface coating of the CdS particle with a thin layer of Ag2S or forming ternary CdxAg1−xS particle. The FCA cross sections of CdxAg1−xS solutions were estimated to be between 10−19 and 10−18 cm2, which are comparable with those of bulk semiconductors.
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42.70.Nq Other nonlinear optical materials; photorefractive and semiconductor materials
42.50.Md Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency
42.50.Gy Effects of atomic coherence on propagation, absorption, and amplification of light; electromagnetically induced transparency and absorption
78.67.Bf Nanocrystals, nanoparticles, and nanoclusters
42.62.Eh Metrological applications; optical frequency synthesizers for precision spectroscopy

Measuring multimodal size distributions of aquatic colloids at trace concentrations

C. Walther, H. R. Cho, and Th. Fanghänel

Appl. Phys. Lett. 85, 6329 (2004); http://dx.doi.org/10.1063/1.1842359 (3 pages) | Cited 11 times

Online Publication Date: 17 December 2004

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Many applications in research as well as industry require a highly sensitive detection of particulate matter in water or process liquids. We present a technique to measure the distribution of colloid sizes between 20 and 100 nm in situ at ultratrace concentrations. The method is based on laser-induced breakdown detection, which has been applied for trace detection of colloids and determination of the weighted mean size. Using a refined method of data evaluation, we are now able to measure the number density of inorganic colloids in six size classes between 20 and 100 nm simultaneously below ppb concentration.
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82.70.Dd Colloids
82.70.Kj Emulsions and suspensions
61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
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