M. I. Haftel | Searcharxiv

arXiv2015

Small footprint nano-mechanical plasmonic phase modulators

The authors' recent Nature Photonics article titled "Compact Nano-Mechanical Plasmonic Phase Modulators" [1] is reviewed which reports a new phase modulation principle with experimental demonstration of a 23 μm long non-resonant modulator having 1.5 π rad range with 1.7 dB excess loss at 780 nm. Analysis showed that by decreasing all dimensions, a low loss, ultra-compact π rad phase modulator is possible. Application of this type of nano-mechanical modulator in a miniature 2 x 2 switch is suggested and an optical design numerically validated. The footprint of the switch is 0.5 μm x 2.5 μm.

physics.optics↗

arXiv2000

Oscillatory Driving of Crystal surfaces: a Route to Controlled Pattern Formation

We show that the oscillatory driving of crystal surfaces can induce pattern formation or smoothening. The driving force can be of quite different origin such as a pulsed laser beam, an electric field, or elasticity. Depending on driving conditions, step bunching and meandering, mound formation, or surface smoothening may be seen in presence of a kinetic asymmetry at the steps or kinks (the Ehrlich-Schwoebel effect). We employ a step model to calculate the induced mass flux along misoriented surfaces, which accounts for surface dynamics and stability. Flux inversion is found when varying the driving frequency. Slope selection and metastability result from the cancellation of the mass flux along special orientations. Kinetic Monte Carlo simulations illustrate these points.

cond-mat.stat-mech↗