Session Index

Plasmon-induced hot electron transfer has attracted much attention as a novel strategy for the solar energy conversions. However, the solar energy conversion efficiency is limited by the insufficient absorption on monolayer of metallic nanoparticles.

 

For generating ultrashort photoacoustic pulse, here we propose to use two-dimensional electron gas (2DEG) as the photoacoustic transducer. By creating 2DEG on the a-Ga2O3/GaN interface and utilizing optical femtosecond excitation, we successfully demonstrated < 400 fs photoacoustic pulse with a bandwidth up to 2.1 THz through hot-electron gas thermal-expansion.

 

We propose a metallic nanostructure named plasmonic bowtie notch (PBN) with curved grooves for optical trapping of nanoparticle. The experimental results show that an 1 μm PS can be stably trapped with low threshold incident intensity of 0.025 mW/μm2, which is 3 times lower than that of pure PBN.

 

We demonstrate for the first time room-temperature lasing emission with green gamut from GQDs in a vertical optical cavity composed. The lasing is enabled by the unique design of the DBR which not only provides a wide stopband but also allows high transmittance of optical excitation in the UV-light region.

 

The performance of 2D material-based devices is drastically influenced by actual interfacial bonding of van-der-Waals (vdWs) heterostructures. To monitor the vdWs bonding, here we propose THz photoacoustic spectroscopy to nondestructively probe the vdWs heterostructure. Our method provides the only way to monitor the bonding strength and distribution.

 

The integration of polymer grating and graphene-based micro-heater on silicon strip waveguide to form a tunable Bragg reflector is conducted. As-realized waveguide grating provides 3.17-nm reflection bandwidth and 21-dB extinction ratio at 1510 nm of wavelength that can be finely tuned by the micro-heater with a rate of 0.8 pm/mW.