Several devices of the future generation wireless telecommunication technologies that use bands in THz frequencies for data transmission need low-loss and low-permittivity materials to enable ideal conditions propagation electromagnetic waves. Herein, a lightweight dielectric bullet-shaped lens operating frequency range 110–170 GHz is demonstrated collimate waves, thus increasing intensity elec...

We report a technique for controlling interparticle spacing and position for inertially-focused particles at high concentrations using structured microfluidic channels. Particle control in flow holds many applications in the development of more efficient microfluidic platforms such as in particle encapsulation for droplet microfluidics, particle separation techniques, and high-throughput flow c...

The absorption length for photon propagation in highly concentrated colloidal dispersions calculated from temporal intensity profiles of 100 femto-second pulses is much longer than the absorption length obtained from the measurements of static light transmission in the pure continuous phase fluid. The difference between these two values is explained on the basis of small interparticle spacing a...

Two-dimensional superlattices of organically passivated 2.6-nm silver quantum dots were prepared as Langmuir monolayers and transferred to highly oriented pyrolytic graphite substrates. The structural and electronic properties of the films were probed with variable temperature scanning tunneling microscopy. Particles passivated with decanethiol ~interparticle separation distance of ;1.160.2 nm)...

Computer simulations are used to test whether a recently introduced generalization of Rosenfeld's excess-entropy scaling method for estimating transport coefficients in systems obeying molecular dynamics can be extended to predict long-time diffusivities in fluids of particles undergoing Brownian dynamics in the absence of interparticle hydrodynamic forces. Model fluids with inverse-power-law, ...

The influence of the local contact network on interparticle forces and effective particle weights is studied in simulations of two-dimensional packings of frictionless, Hertzian spheres. The weight distribution P(w) changes qualitatively when approaching a boundary and differs for regular and irregular packings, while the interparticle force distribution P(f) is robust. We provide examples wher...

We demonstrate a convenient and cost-effective chemical approach for fabricating highly ordered Au nanoparticle arrays with sub-10-nm interparticle gaps. Near-field enhancements inside the interparticle gaps create uniform periodic arrays of well-defined "hot spots" exploitable for large surface-enhanced Raman spectroscopy (SERS) enhancements. A cetyltrimethylammonium bromide (CTAB) bilayer sur...