Fig. 1: Reconfigurable frequency doubling device.
From: Ultrabroadband milliwatt-level resonant frequency doubling on a chip
A Conceptual schematic of the device. The pump and SH circulate respectively in the south and north loops, sharing a fraction of the optical path where nonlinear interactions (AOP and SHG) occur. B Resonances distribution for the north (top) and south (bottom) resonators, respectively at the pump and SH frequencies. The absolute resonance frequencies in the north (south) ring can be tuned by acting on the north (south) heater. The resonators' FSR can be individually tuned by tailoring the respective loop length. C Micrographs of the fabricated chip and (D) a single device. E Low power transmission spectra for the TE00 mode in the SH (top) and pump (bottom) bands. The detail shows a typical pair of resonances involved in the SHG process and associated Lorentz fit.
