Spalled barium titanate single crystal thin films for functional device applications
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arXiv
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| Format: | Preprint |
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2025
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| author | Thureja, Prachi Nyholm, Andrew W. Thomaschewski, Martin Jahelka, Phillip R. Belleville, Julie Atwater, Harry A. |
| author_facet | Thureja, Prachi Nyholm, Andrew W. Thomaschewski, Martin Jahelka, Phillip R. Belleville, Julie Atwater, Harry A. |
| contents | We report a scalable approach for fabricating single-crystal barium titanate (BTO) thin films through spalling from bulk substrates. Conventional thin film growth techniques often face challenges in achieving high-quality single crystal microstructure over large areas, resulting in reduced performance in functional devices. In contrast, spalling - i.e., performing stress-induced exfoliation of bulk single crystals - enables the separation of single crystal thin films with controllable thicknesses ranging from 100 nm to 15 um and lateral dimensions up to several millimeters. Electro-optic characterization of the spalled films yields a Pockels coefficient of r33 = 55 pm/V in multi-domain regions and 160 pm/V in single-domain regions, leading to projections up to 1980 pm/V for r42 under conditions of unclamped excitation. Our results indicate that spalled BTO single-crystal thin films preserve bulk electro-optic properties and exceed the performance of commercially available thin-film lithium niobate, making them suitable for integration in advanced photonic and optoelectronic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_04045 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spalled barium titanate single crystal thin films for functional device applications Thureja, Prachi Nyholm, Andrew W. Thomaschewski, Martin Jahelka, Phillip R. Belleville, Julie Atwater, Harry A. Applied Physics We report a scalable approach for fabricating single-crystal barium titanate (BTO) thin films through spalling from bulk substrates. Conventional thin film growth techniques often face challenges in achieving high-quality single crystal microstructure over large areas, resulting in reduced performance in functional devices. In contrast, spalling - i.e., performing stress-induced exfoliation of bulk single crystals - enables the separation of single crystal thin films with controllable thicknesses ranging from 100 nm to 15 um and lateral dimensions up to several millimeters. Electro-optic characterization of the spalled films yields a Pockels coefficient of r33 = 55 pm/V in multi-domain regions and 160 pm/V in single-domain regions, leading to projections up to 1980 pm/V for r42 under conditions of unclamped excitation. Our results indicate that spalled BTO single-crystal thin films preserve bulk electro-optic properties and exceed the performance of commercially available thin-film lithium niobate, making them suitable for integration in advanced photonic and optoelectronic devices. |
| title | Spalled barium titanate single crystal thin films for functional device applications |
| topic | Applied Physics |
| url | https://arxiv.org/abs/2505.04045 |