We have demonstrated a surface-enhanced Raman scattering (SERS) substrate capable of detecting 1 pM of benzenethiol (BT) and developed better understanding of its enhancing mechanism by varying the fabrication process and also performing detailed simulation studies. The extreme enhancement originates from the three dimensionally fabricated and optimized substrate, which is made of Au-nanopartic...

Monte Carlo simulation is applied to investigate phonon transport in single crystalline Si nanowires. Phonon-phonon normal N and Umklapp U scattering processes are modeled with a genetic algorithm to satisfy energy and momentum conservation. The scattering rates of N and U scattering processes are found from first-order perturbation theory. The thermal conductivity of Si nanowires is simulated ...

Antisymmetric exchange interactions lead to non-reciprocal spin-wave propagation. As a result, spin waves confined in nanostructure are not standing waves; they have time-dependent phase, because counter-propagating of the same frequency different wavelengths. We report on Brillouin light scattering (BLS) study Co/Pt nanowires with strong Dzyaloshinskii-Moriya (DMI). Spin-wave quantization narr...

Silicon nanowires have been patterned with mean widths down to 4 nm using top-down lithography and dry etching. Performance-limiting scattering processes have been measured directly which provide new insight into the electronic conduction mechanisms within the nanowires. Results demonstrate a transition from 3-dimensional (3D) to 2D and then 1D as the nanowire mean widths are reduced from 12 to...

Plasmonic nanodevices are metallic structures that exhibit plasmonic effects when exposed to light, causing scattering and enhancement of that light. These plasmons makes it possible for light to be focused below the diffraction limit. Darkfield spectroscopy has been used to capture the scattering spectra of these structures in order to examine the scattering and resonant frequencies of the pla...

the purpose of the present paper is to develop light beam method to measurement of interfacial area in a rectangular gas-liquid bubble column. total interfacial area can be determined in bubble column filled by transparent liquid by light transmission method. according to pervious researches, the fraction of parallel light is function of interfacial area and optical path length that these two p...