Tianren Fan

High-Q integrated photonic microresonators on 3C-SiC-on-insulator (SiCOI) platform

We report a high-quality 3C-silicon carbide (SiC)-on-insulator (SiCOI) integrated photonic material platform formed by wafer bonding of crystalline 3C-SiC to a silicon oxide (SiO2)-on-silicon (Si) substrate. This material platform enables to develop integrated photonic devices in SiC without the need for undercutting the Si substrate, in contrast to the structures formed on conventional 3C-SiC-on-Si platforms. In addition, we show a unique process in the SiCOI platform for minimizing the effect of lattice mismatch during the growth of SiC on Si through polishing after bonding. This results in a high-quality SiCOI platform that enables record high Qs of 142,000 in 40 µm radius SiC microring resonators. The resulting SiCOI platform has a great potential for a wide range of applications in integrated optics, including nonlinear optical devices, quantum optical devices, and high-power optical devices.

Light-matter interaction in 2D material heterostructures (Conference Presentation)

Two-dimensional transition metal dichalcogenide (TMDC) heterostructures provide a unique platform for strong light-matter interaction in a wide wavelength range. Here, we report the formation of high-quality TMDC heterostructures through a dry transfer method along with the study of the detailed physical properties of heterostructures formed between MoS2 and MoSe2 (especially, simultaneous quenching of photoluminescence of both materials in the overlapping region, red shift and broadening of the MoSe2 photoluminescence) will be reported. We also report the formation of a thin tunable diode by depositing metal contacts on TMDCs and the back-gate.