We present results of numerical simulations and preliminary experiments to investigate and characterize the effect of asymmetrical coupling of normally incident light to surface plasmon polaritons ͑SPPs͒ on metallic blazed gratings. Two types of blazed gratings are investigated, a two-dimensional ͑2D͒ area-coded binary grating and a one-dimensional ͑1D͒… (More)
UNLABELLED Ultrasmall microring and microdisk lasers with an asymmetric air/GaAs/Al0.98Ga0.02As waveguide and an active region based on InAs/InGaAs/GaAs quantum dots emitting around 1.3 μm were fabricated and studied. The diameter D of the microrings and microdisks was either 2 or 1.5 μm, and the inner diameter d of the microrings varied from 20% to 70% of… (More)
We vary relative arrangement of anisotropic metal nanoparticles (metamolecules) in arrays. Their second-harmonic response is not a simple orientational average of the molecular responses. Instead, collective resonances of the structures dominate.
Second-harmonic generation from arrays of gold nanoparticles exhibits interference between electric-dipole and higher multipole (magnetic-dipole and electric-quadrupoles) effects. We show that improved sample quality suppresses the role of higher multipole effects in second-harmonic generation from L-shaped gold nanoparticles, thereby opening the… (More)