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Updated: May 5, 2026

Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators
Published on: August 15, 2014
Bidirectional beam deflection induced by the local phase transition through field-driven dynamics of polar
Abstract:
A recent experiment revealed what we believe to be a novel bidirectional deflection phenomenon in single KTN crystals near the Curie temperature by only applying unidirectional electric field. The electric-field dependent dielectric permittivity was measured to clarify the dielectric response to the electric field through field-driven reorientation and condensation of polar nanoregions (PNRs) and the phenomenon of the field-induced phase transition. Based on the screening effect of space charge, a special high-low-high electric field distribution was revealed, resulting in the local phase transition. The deflection mechanism arises from the coupling influence of linear and quadratic electro-optic (EO) effects induced by the local phase transition, proved by the I-V property, the micrography of KTN crystal, and the deflection performance through varying the incident position. The work reveals the implementation method of the local phase transition through field-driven PNRs dynamics for space-charge-controlled KTN crystal, and provides a basis for the development of bidirectional scanning devices.
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