Engineering study demonstrates electrical thermo-optic tuning in ultrahigh-Q microtoroid resonators, highlighting potential for integrated optical devices.
The ability to tune resonant frequency in optical microcavities is an essential feature for many applications. Integration of electrical-based tuning as part of the fabrication process has been a key advantage of planar microresonant devices. Until recently, the combination of these features has not been available in devices that operate in the ultrahigh-Q regime where device quality factors (Q) can exceed 100 million. In this letter, we demonstrate an electrically tunable resonator on a chip with ultrahigh-quality factors. Futhermore, the devices have demonstrated tuning rates in excess of 85GHz∕V2 and are capable of tuning more than 300GHz.
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Min et al. (2004) studied this question.
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