In this paper, we demonstrate a high-Q LNOI microdisk coupling with a silicon nitride (Si3N4) optical waveguide. Its resonance characteristic can be turned by a thermistor on the microdisk resonator. The LNOI microdisk resonator is fabricated by inductively coupled plasma-reactive ion etching (ICP-RIE). Its sidewall is further smoothed by employing chemical mechanical polishing (CMP) to improve the quality factor (Q-factor). The LNOI/Si3N4 heterogeneous integrated resonator shows a Q-factor of 2.58 × 105, and a wavelength tunability of ~14.5 pm/W.
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