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8 May 2006

Volume 88, Issue 19, Articles (19xxxx)

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Appl. Phys. Lett. 88, 193113 (2006); http://dx.doi.org/10.1063/1.2202003 (3 pages)

Fa-Quan He and Ya-Pu Zhao
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Cavity enhanced Faraday rotation of semiconductor quantum dots

Y. Q. Li, D. W. Steuerman, J. Berezovsky, D. S. Seferos, G. C. Bazan, and D. D. Awschalom

Appl. Phys. Lett. 88, 193126 (2006); http://dx.doi.org/10.1063/1.2202393 (3 pages) | Cited 12 times

Online Publication Date: 12 May 2006

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Dielectric vertical cavities are used to study the spin dynamics of molecularly self-assembled colloidal CdSe quantum dots (QDs). A quality factor dependent enhancement of Faraday rotation ( ∼ 25×) is observed and attributed to optically excited spins interacting with multiple passes of the cavity photons. This enables dynamical measurements at extremely low powers on relatively small numbers of quantum confined spins. In CdSe QDs, measurements reveal that spectroscopic contributions from exciton and electron spin precession depend on the power of excitation. We demonstrate that this scheme is amenable to chemically synthesized systems as a means to increase detection sensitivity.
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78.20.Ls Magneto-optical effects
73.21.La Quantum dots

Field emission image uniformity improvement by laser treating carbon nanotube powders

K. F. Chen, K. C. Chen, Y. C. Jiang, L. Y. Jiang, Y. Y. Chang, M. C. Hsiao, and L. H. Chan

Appl. Phys. Lett. 88, 193127 (2006); http://dx.doi.org/10.1063/1.2203206 (2 pages) | Cited 28 times

Online Publication Date: 12 May 2006

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Carbon nanotube powders were synthesized by arc discharge method and incorporated into the paste to be applied in the screen printing process. It was investigated that the field emission image uniformity was efficiently improved by laser treating carbon nanotube powders. The laser energy burned out carbon particles to reveal more carbon nanotubes and graphitized carbon nanotubes. In addition to uniformity improvement, field emission properties were also reinforced after laser treating. For instance, turn-on voltage decreased from 3.2 to 2.2 V/μm, while field enhancement factor increased from 2200 to 2900.
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79.70.+q Field emission, ionization, evaporation, and desorption
42.62.-b Laser applications
85.45.Fd Field emission displays (FEDs)
85.35.Kt Nanotube devices

Confining light in two-dimensional slab photonic crystal waveguides with metal plates

Bing Wang and Guo Ping Wang

Appl. Phys. Lett. 88, 193128 (2006); http://dx.doi.org/10.1063/1.2203511 (3 pages) | Cited 3 times

Online Publication Date: 12 May 2006

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Light cannot be strongly confined in two-dimensional (2D) slab photonic crystal waveguides (PCWs) when the slab thickness is less than half a wavelength. By using the finite-difference time-domain method, we theoretically demonstrate that two metal plates clad 2D PCWs (MCPCWs) constructed by sandwiching a PCW into two parallel metal plates can well compress light field in the vertical direction of PCW plane. A method for improving the propagation efficiency of MCPCWs is suggested and demonstrated numerically. Our result implies that MCPCWs may provide another method to create planar PC devices on metallic surfaces for highly integrated optical circuits.
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42.70.Qs Photonic bandgap materials
42.79.Gn Optical waveguides and couplers
02.70.Bf Finite-difference methods
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