| Autor: |
Shang, Annan, Liu, Ruijia, Chen, Chang-Jiang, Lee, Yun‐Goo, Chao, Ju-Hung, Zhang, Wei, Wetherington, Maxwell, Yin, Shizhuo |
| Předmět: |
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| Zdroj: |
Physica Status Solidi - Rapid Research Letters; Jun2022, Vol. 16 Issue 6, p1-8, 8p |
| Abstrakt: |
A giant linear electro‐optic (EO) effect and high transparency in ferroelectric potassium tantalate niobate [(KTa1−xNbxO3), KTN] crystal is achieved via a thermally controlled domain engineering method. It involves a two‐step thermal annealing process: 1) a rapid cooling process that forms polar nano‐regions (PNRs), i.e., a cooling rate of 1.67 °C s−1 from Tc+58 °C to Tc+8 °C where Tc is the Curie temperature; and 2) a slow cooling process that facilitates abnormal domain growth (AGG) i.e., a cooling rate of 0.0115 °C s−1 from Tc+8 °C to Tc−15 °C. Since PNR can have a faceted boundary and high anisotropy, it can promote AGG within single crystals to realize solid‐state domain conversion macroscopically from a multi‐domain to single‐domain crystal within a slow cooling process. The resultant KTN crystal offers high transparency that is equivalent to its paraelectric phase; and a linear EO coefficient (γ51) as large as γ51≈51200 pm V−1, which is five times the value of conventional KTN crystals with similar composition. This giant linear EO coefficient represents a major technical advance in EO materials and significantly reduces the driving voltage, power, and footprint of many types of EO devices. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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