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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 ͑Q͒ can exceed 100 million. In this letter, we demonstrate an electrically tunable resonator on a chipdoi:10.1063/1.1825069 fatcat:xnwj72hwnbgtjj5j5txunseaqi