Session Index

In group-III nitrides in use for white light-emitting diodes (LEDs), optical gain, measure of luminous efficiency, is very low owing to the built-in electrostatic fields, low exciton binding energy, and high-density misfit dislocations due to lattice-mismatched substrates. Cuprous halides I-VII semiconductors, on the other hand, have negligible built-in field, large exciton binding energies and close lattice matched to silicon substrates. Previously, we showed that the optical gain and the luminescence are expected to be much larger than that of group III-nitrides due to large exciton binding energy and vanishing electrostatic fields. Here we report theoretical and experimental results of optoelectronic properties of cuprous halides grown on Si which agrees with the theoretical predictions.

 

Increasing interest in electrodynamics and spectroscopy of toroidal excitations in matter has initiated a discussion on independent physical significance of toroidal and electric dipole excitations. Here we introduce two experiments that reveal their fundamental differences.

 

Plasmonic nanoantennas were integrated into atomically thin transition metal dichalcogenides to gain insight into nanoscale light-matter interactions. Herein, we introduce gap surface plasmons in the tailored nanoantennas. In addition, the optimized nanoantennas are employed on a bilayer molybdenum disulfide to enhance the catalytic properties of MoS2 for hydrogen evolution.

 

Fluorescent nanodiamonds (FNDs) having nitrogen-vacancy centers have drawn much attention for their biocompatibility and stable optical properties. Nevertheless, the nitrogen-vacancy centers are located in the interior of the FNDs. In this paper, we present a simple nanocavity structure that provides a large region to enhance the fluorescence intensity of FNDs.

 

In recent years, localize surface plasmon resonance has been widely used to improve the efficiency of green energy devices. The combination of metal and high refractive index material nanostructure is demonstrated in this article. In this study, the absorption could be enhanced ~ 150% or suppressed by different illumination direction.