Session Index

Photonic lattices have provided a powerful platform to emulate Dirac physics while discovering new phenomena that would otherwise be inaccessible in natural 2D Dirac materials. In this talk, I will present some of our recent work based on photonic graphene and Lieb lattices, including pseudospin-mediated vortex generation, valley Bloch oscillations and Landau-Zener tunneling, and unusual flatband states. I will then focus on discussing pseudospin-orbit angular momentum conversion and universal momentum-to-real-space mapping of topological singularities arising from the interplay of pseudospin, orbital angular momentum of light, and the Berry phase.

 

We experimentally characterize the spectral properties of a type-II PPLN spontaneous parametric down-conversion waveguide source and demonstrate the spectral information of the cross-polarized photon-pair source can be fully reconstructed using the quantum-classical correspondence. This technique opens the possibility of fast monitor and control of the quantum state of photon-pair sources.

 

We applied the RCWA method combined with 1D Poisson, drift-diffusion and Schrodinger solver to design the InGaN based VCSEL and we focused on UV wavelength (412 nm). Also, we discussed the relationship between numbers of QWs and both threshold gain and current.

 

We demonstrate 940 nm VCSELs using Zn-diffusion, which exhibits high-power (6.8 mW), highly single-mode (SMSR>50 dB) performances, wide -3-dB E-O bandwidth (18 GHz) and moderate far-field pattern over the full range of bias currents. A short rise/fall time (20/11 ps) can also be achieved simultaneously.

 

In this paper, we compared relationship between wavelength and thermal effect for three-section DFB laser. Measurement results reveal there was 0.075nm/°C red shift. Simulation results were compared between the calculation and measured of the three section device.

 

In this work, we observed the damage status of the stems of Mikania micrantha illuminated by IR and blue lasers, respectively.