Session Index

The surface plasmon manipulated Smith-Purcell radiaitons on Yagi-Uda nano-antenna are investigated by FDTD simulation. The far-field pattern can be designed by changing the lengths of feed and director elements and the grating period. This work offers potential applications in the fields of light source, optical beam steering and holography.

 

In this work, we exploited an optimized grating nanostructure to enhance the lasing action in solvent-engineered organometal perovskite thin films at room temperature. Furthermore, by mechanically stretching the supporting substrate, the periodic structural variation may alter the light-emitting performance of the hybrid plasmon-perovskite structure, making practical room-temperature meta-devices.

 

We investigated several surface passivation schemes prior to rapid melt growth (RMG) of GaSb on Si substrate. The deposition of an Sb layer (10 nm) as a passivation layer on GaSb surfaces was found to have better optical and structural properties with less Si diffusion and stronger photoluminescence signal.

 

We propose high absorptance device by using amorphous Germanium (Ge) metasurface. The suppression of backward and forward scattering can be realized by overlapping the Lattice resonance and the Mie resonance. Because the cancellation of scattering in far-field, the absorptance can be increased and produce a high absorptance peak at 1.55um

 

In this study, the optical properties of InAs SML QDs with GaAsSb capping layer was investigated and improved SML QD PL intensity was also observed. However, the insertion of AlGaAsSb barrier with high energy bandgap, the PL spectrum of QDs showed a slight blue shift with decreased PL intensity.

 

We designed one-dimensional planar hyperbolic metamaterial (P-HMM) which supported high k modes and nice coupling that would enhance the MoS2 spontaneous emission. The advantages of P-HMM were strong light-matter interaction with atomic layer on surface and had anisotropic permittivity that could achieve planar coupling and resonance.

 

The nonlinear characteristics of various layer graphene was investigated by Z-scan technique. The results showed that the nonlinear absorption coefficient and nonlinear refractive index increased as the number of layer increased. It suggests that the lower layer graphene may be preferable to use as saturable absorber in mode-locked lasers.