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13 Nov 2006

Volume 89, Issue 20, Articles (20xxxx)

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Appl. Phys. Lett. 89, 202101 (2006); http://dx.doi.org/10.1063/1.2388049 (3 pages)

J. H. Lee, Zh. M. Wang, N. W. Strom, Yu. I. Mazur, and G. J. Salamo
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Hollow core photonic crystal fiber surface-enhanced Raman probe

He Yan, Claire Gu, Changxi Yang, Jie Liu, Guofan Jin, Jiatao Zhang, Lantian Hou, and Yuan Yao

Appl. Phys. Lett. 89, 204101 (2006); http://dx.doi.org/10.1063/1.2388937 (3 pages) | Cited 27 times

Online Publication Date: 15 November 2006

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The authors demonstrate a hollow core photonic crystal fiber (HCPCF) surface-enhanced Raman probe consisting of a HCPCF with Au nanoparticles coated on the inner surface of the air holes serving as the substrate of surface-enhanced Raman scattering (SERS). The experimental results indicate that the confinement of light inside the HCPCF and the coating of nanoparticles/analyte inside the air holes of the HCPCF offer a large area for the light to interact with the SERS particles. An optimized design of the HCPCF is provided to further improve the probe sensitivity.
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42.81.Pa Sensors, gyros
42.70.Qs Photonic bandgap materials
42.81.Wg Other fiber-optical devices
42.15.Eq Optical system design

Improvement of the thermoelectric characteristics of Fe-doped misfit-layered Ca3Co4−xFexO9+δ (x = 0, 0.05, 0.1, and 0.2)

Chia-Jyi Liu, Li-Chen Huang, and Jung-Sheng Wang

Appl. Phys. Lett. 89, 204102 (2006); http://dx.doi.org/10.1063/1.2390666 (3 pages) | Cited 31 times

Online Publication Date: 17 November 2006

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The authors report measurements of the electrical resistivity, Seebeck coefficient, and thermal conductivity for a series of misfit-layered oxides Ca3Co4−xFexO9+δ (x = 0, 0.05, 0.1, 0.15, 0.2) prepared by solid state reaction. Structural parameters are refined with superspace group of X2/m(0b0)s0 using powder x-ray diffraction data. With partial substitution of Fe+2 for Co+3, the resistivity decreases, while the thermopower increases simultaneously. The x = 0.05 sample exhibits a higher figure of merit (Z = 3.01×10−4 K−1) than that of Ca3Co4O9+δ (0.33×10−4 K−1) at 300 K, indicating much improvement of thermoelectric characteristics via partial substitution of Fe for Co.
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72.20.Pa Thermoelectric and thermomagnetic effects
66.70.-f Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves
61.50.Ah Theory of crystal structure, crystal symmetry; calculations and modeling
61.66.Fn Inorganic compounds
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