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Topographically controlled growth of silver nanoparticle clusters

  1. Top of page
  2. Topographically controlled growth of silver nanoparticle clusters
  3. Compact surface structures for the efficient excitation of surface plasmon-polaritons
  4. Structurally induced magnetization in a La2/3Sr4/3MnO4 superlattice

Jung-Sub Wi, Lok Kumar Shrestha, and Tadaaki Nagao

The authors present a method for promoting the nucleation of Ag nanoparticles by using lithographically defined Si nanowells. The preferred heterogeneous nucleation of Ag nanoparticles allows for the localization of Ag nanoparticle clusters inside the Si nanowell and the formation of regular arrays of surface-enhanced Raman scattering (SERS) active sensors. Highly enhanced surface plasmon fields at the Ag nanoparticle clusters were confirmed by three-dimensional electromagnetic simulation and by increased Raman intensities. Based on these results, the combination of top-down nanoscale templating and bottom-up nanoparticle synthesis using a broad range of materials, array designs, and applications, can be envisioned.

Phys. Status Solidi RRL (2012) DOI 10.1002/pssr.201206082

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Compact surface structures for the efficient excitation of surface plasmon-polaritons

  1. Top of page
  2. Topographically controlled growth of silver nanoparticle clusters
  3. Compact surface structures for the efficient excitation of surface plasmon-polaritons
  4. Structurally induced magnetization in a La2/3Sr4/3MnO4 superlattice

S. de la Cruz, E. R. Méndez, D. Macéas, R. Salas-Montiel, and P. M. Adam

The ability to couple volume propagating optical waves into surface plasmon-polaritons (SPPs) in small and confined spaces is crucial for the development of plasmonic circuits. Based on rigorous electromagnetic methods, de la Cruz et al. study the excitation of SPPs through surface structures of nanometric dimensions, illuminated by focused beams. The authors consider steps, grooves and angled steps, and calculate efficiency maps for these structures as functions of the parameters that define them. They also study the efficiency associated with sequences of a small number of grooves and find that such compact structures can couple about 45% of the light into a directional SPP.

Phys. Status Solidi B (2012) DOI 10.1002/pssb.201100757

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Structurally induced magnetization in a La2/3Sr4/3MnO4 superlattice

  1. Top of page
  2. Topographically controlled growth of silver nanoparticle clusters
  3. Compact surface structures for the efficient excitation of surface plasmon-polaritons
  4. Structurally induced magnetization in a La2/3Sr4/3MnO4 superlattice

Amish B. Shah, Brittany B. Nelson Cheeseman, Ganesh Subramanian, Anand Bhattacharya, and John C. H. Spence

La2/3Sr4/3MnO3 (LSMO) can exhibit anisotropic electrical transport properties in bulk crystals. Artificial layered heterostructures offer the possibility of confining magnetic moments to two dimensional sheets and increasing the anisotropy compared to bulk crystals. A LSMO cation ordered superlattice grown by molecular beam epitaxy showed a large enhancement of magnetization in the out-of-plane direction upon cooling the sample below 110 K. Atomic-resolution structural analysis of the sample shows the formation of nanopatches of incoherency to the underlying SrTiO3 substrate when cooling the sample below 150 K. This structural transition observed only in superlattices leads to an enhancement of magnetic moment in the out-of-plane direction.

Phys. Status Solidi A (2012) DOI 10.1002/pssa.201127728

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