Due to the breakdown of Derjaguin approximation at the nanoscale level apart from the neglect of the atomic discrete structure, the underestimated number density of atoms, and surface effects, the continuum Hamaker model does not hold to describe interactions between a spherical nanoparticle and a flat surface. In this work, the interaction forces including van der Waals (vdW) attraction, Born ...

We investigate the applicability of coupled multipole model and its modification in framework zero-order Born approximation for modeling light focusing by finite-size nanostructures silicon nanospheres, supporting electric magnetic dipole quadrupole resonances. The results based on analytical approximations are verified comparison with numerical simulations performed T-matrix method. Using evol...

Synthesis of highly aligned single-walled carbon nanotubes (SWNTs) with controlled positions is an important step toward manufacturable ultradense carbon nanotube integrated circuits. One of the most promising synthesis methods is chemical vapor deposition (CVD), in which small catalyst particles with diameters of approximately a few nanometers determine the position and diameter of SWNTs.1 Sig...

The fabrication of nanostructured materials is an area of continuous improvement and innovative techniques that fulfill the demand of many fields of research and development. The continuously decreasing size of the smallest patternable feature has expanded the catalog of methods enabling the fabrication of nanostructured materials. Several of these nanofabrication techniques have sprouted from ...

Metal film over nanosphere (MFON) electrodes are excellent substrates for surface-enhanced Raman scattering (SERS) spectroscopy. These surfaces are produced by vapor deposition of a metal film over nanospheres that are assembled in a hexagonally close packed arrangement. The efficiency and reproducibility of AgFON electrode as SERS substrates are confirmed by the repeatability of the electroche...

Vertically aligned, catalyst-free semiconducting nanowires hold great potential for photovoltaic applications, in which achieving scalable synthesis and optimized optical absorption simultaneously is critical. Here, we report combining nanosphere lithography (NSL) and selected area metal-organic chemical vapor deposition (SA-MOCVD) for the first time for scalable synthesis of vertically aligned...

Surface enhanced Raman scattering (SERS) in a nanometer size hotspot has empowered the investigation of chemical structures and dynamic behaviors of one and a few molecules. However, further advancement is hindered by lack of large enough yet reproducible enhancement in single deterministic hotspots. To resolve this problem, here we introduce a nanosphere-plane antenna under radially polarized ...

Dielectric nanosphere arrays are considered as promising light-trapping designs with the capability of transforming the freely propagated sunlight into guided modes. This kinds of designs are especially beneficial to the ultrathin hydrogenated amorphous silicon (a-Si:H) solar cells due to the advantages of using lossless material and easily scalable assembly. In this paper, we demonstrate numer...

We use a double nanohole (DNH) optical trap to quantify the size and concentration of nanoparticles in solution. The time to trap shows a linear dependence with nanosphere size and a -2/3 power dependence with nanosphere concentration, which is in agreement with simple microfluidic considerations. The DNH approach has size-specificity on the order of a few nanometers, which was used to selectiv...