title: Electrically tunable high Q-factor micro-ring resonator based on blue phase liquid crystal cladding.
abstract: This work demonstrates an electrically tunable silicon nitride (SiN) micro-ring resonator with polymer-stabilized blue phase liquid crystals (PSBPLCs) cladding. An external vertical electric field is applied to modulate the refractive index of the PSBPLCs by exploiting its fast-response Kerr effect-induced birefringence. The consequent change in the refractive index of the cladding can vary the effective refractive index of the micro-ring resonator and shift the resonant wavelength. Crystalline structures of PSBPLCs with a scale of the order of hundreds of nanometers ensure that the resonator has a very low optical loss. The measured tuning range is 0.45 nm for TM polarized light under an applied voltage of 150V and the corresponding response time is in the sub-millisecond range with a Q-factor of greater than 20,000.
authors.forename: Chun-Ta
authors.initials: CT
authors.lastname: Wang
authors.forename: Yuan-Cheng
authors.initials: YC
authors.lastname: Li
authors.forename: Jui-Hao
authors.initials: JH
authors.lastname: Yu
authors.forename: Cheng Yu
authors.initials: CY
authors.lastname: Wang
authors.forename: Chih-Wei
authors.initials: CW
authors.lastname: Tseng
authors.forename: Hung-Chang
authors.initials: HC
authors.lastname: Jau
authors.forename: Yung-Jui
authors.initials: YJ
authors.lastname: Chen
authors.forename: Tsung-Hsien
authors.initials: TH
authors.lastname: Lin