Colossal optical anisotropy in wide-bandgap semiconductor CuAlO2
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866910749322903552 |
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| author | Kang, Baekjune Shin, Junhee Kang, Myeongjun Choi, Uksam Seo, Uihyeon Chung, Kunook Ok, Jong Mok Jin, Hosub Sohn, Changhee |
| author_facet | Kang, Baekjune Shin, Junhee Kang, Myeongjun Choi, Uksam Seo, Uihyeon Chung, Kunook Ok, Jong Mok Jin, Hosub Sohn, Changhee |
| contents | Colossal optical anisotropy in the entire visible spectrum is crucial for advanced photonic applications, enabling precise light manipulation without optical loss across a broad spectral range. Here, we demonstrate that CuAlO2 exhibits colossal optical anisotropy and transparency across the visible spectrum, enabled by its unique three-dimensional O-Cu-O dumbbell structure and two-dimensionally confined excitons. Using mm-sized single crystals, we independently measured ab-plane and c-axis optical properties, revealing maximum birefringence (= 3.67) and linear dichroism (= 5.21), the highest reported to date. CuAlO2 retains birefringence over 0.5 throughout the entire visible range and possesses a wide direct bandgap of 3.71 eV, surpassing the birefringence of commercial anisotropic crystals transparent in the visible spectrum. From the two-dimensional screened hydrogen model and first-principles calculations, we demonstrate that the colossal anisotropy arises from a unique excitonic Cu d-p transition confined to the atomic-thick layer. This colossal optical anisotropy and transparency across the entire visible spectrum makes CuAlO2 a promising candidate for future photonic technologies. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_12697 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Colossal optical anisotropy in wide-bandgap semiconductor CuAlO2 Kang, Baekjune Shin, Junhee Kang, Myeongjun Choi, Uksam Seo, Uihyeon Chung, Kunook Ok, Jong Mok Jin, Hosub Sohn, Changhee Materials Science Colossal optical anisotropy in the entire visible spectrum is crucial for advanced photonic applications, enabling precise light manipulation without optical loss across a broad spectral range. Here, we demonstrate that CuAlO2 exhibits colossal optical anisotropy and transparency across the visible spectrum, enabled by its unique three-dimensional O-Cu-O dumbbell structure and two-dimensionally confined excitons. Using mm-sized single crystals, we independently measured ab-plane and c-axis optical properties, revealing maximum birefringence (= 3.67) and linear dichroism (= 5.21), the highest reported to date. CuAlO2 retains birefringence over 0.5 throughout the entire visible range and possesses a wide direct bandgap of 3.71 eV, surpassing the birefringence of commercial anisotropic crystals transparent in the visible spectrum. From the two-dimensional screened hydrogen model and first-principles calculations, we demonstrate that the colossal anisotropy arises from a unique excitonic Cu d-p transition confined to the atomic-thick layer. This colossal optical anisotropy and transparency across the entire visible spectrum makes CuAlO2 a promising candidate for future photonic technologies. |
| title | Colossal optical anisotropy in wide-bandgap semiconductor CuAlO2 |
| topic | Materials Science |
| url | https://arxiv.org/abs/2412.12697 |