Xianzhong Lang

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A convenient nanoscale technique is reported for the fabrication of highly ordered hemispherical silver nanocap arrays templated by porous anodic alumina (PAA) membranes as robust and cost-efficient surface-enhanced Raman scattering (SERS) substrates. This geometry produces a high Raman signal due to its periodic hexagonal arrangements and control of the(More)
Highly ordered silver nanovoid arrays are fabricated on porous anodic alumina membranes to produce robust and cost-efficient surface-enhanced Raman scattering (SERS) substrates. Plasmonic tunability can be accomplished by adjusting the topography with different anode voltages. Evenly distributed plasmonic fields, high average enhancement factor, and(More)
A single-step nanoimprint process for direct patterning of metallic nanostructures at room temperature is described. Porous anodic alumina (PAA) is used for stamps and the structure can be optimized by adjusting the PAA fabrication parameters. The periodic hexagonal cells on the PAA stamps are transferred to the metals by mechanically pressing the stamps(More)
Patterned silver nanocap arrays (PSNAs) prepared on porous anodic alumina templates by a simple coating technique yield enhanced sensitivity and stability in cellular fluorescence imaging. Microstructural analysis, surface-enhanced Raman scattering mapping, and finite difference time domain simulation indicate that the hot spots are evenly distributed on(More)
A convenient reproducible technique is reported for the fabrication of large-area gold semishell arrays by mechanically pressing porous anodic alumina (PAA) stamps into gold/polymer bilayer structures that serve as robust and cost-efficient surface-enhanced Raman-scattering (SERS) substrates. The surface structure can be tuned further to optimize the(More)
A convenient nanotechnique for fabrication of highly ordered hemispherical silver nanocap arrays templated by porous anodic alumina membranes as robust and cost-efficient surface-enhanced Raman scattering (SERS) substrates is reported. This geometry exhibits a high Raman signal due to periodically hexagonal arrangements and gap control between the(More)
We theoretically propose a wide-angle, polarization-independent, and broadband nearly perfect absorber, which consists of an array of concentric multisplit circular rings on top of dielectric spacer and a metallic mirror. The numerical simulation results show that the average absorption reaches 97.2% over the wavelength range from 585 to(More)
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