Measurement of azo dye film with large photo-induced birefringence and complex refractive index
Azo dyes are valuable functional materials due to their sensitive response to and effective modulation of polarized light. It is essential to find out not only the optical anisotropy but also the complex refractive index of azo dye materials for photonics applications. We report here such measuremen...
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2023-05-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/5.0149433 |
| _version_ | 1797771822493597696 |
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| author | Yiyang Gao Jacob Y. Ho Shu-Tuen Tang Wanlong Zhang Man-chun Tseng Olena Vashchenko Valerii Vashchenko Fion Yeung Hoi-Sing Kwok |
| author_facet | Yiyang Gao Jacob Y. Ho Shu-Tuen Tang Wanlong Zhang Man-chun Tseng Olena Vashchenko Valerii Vashchenko Fion Yeung Hoi-Sing Kwok |
| author_sort | Yiyang Gao |
| collection | DOAJ |
| description | Azo dyes are valuable functional materials due to their sensitive response to and effective modulation of polarized light. It is essential to find out not only the optical anisotropy but also the complex refractive index of azo dye materials for photonics applications. We report here such measurements of highly ordered photoaligned azo dye films. The film has an apparent dichroic ratio of about 60. We model the photoaligned azo dye film systems using the Berreman transfer matrix. By means of regression fitting of the polarization dependent transmittance and reflectance data, we were able to determine the complex refractive indices of the aligned film at the wavelength range of 400–1000 nm. This material is found to have exceptionally large optical birefringence (Δn ∼ 0.75 at 632.5 nm and Δn ∼ 0.48 at 850.6 nm). The aligned azo dye film is valuable to applications such as coatable polarizers and optical modulation devices. |
| first_indexed | 2024-03-12T21:42:07Z |
| format | Article |
| id | doaj.art-2df805146ac841359e82d3ea24a89a63 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-03-12T21:42:07Z |
| publishDate | 2023-05-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-2df805146ac841359e82d3ea24a89a632023-07-26T15:31:53ZengAIP Publishing LLCAIP Advances2158-32262023-05-01135055006055006-710.1063/5.0149433Measurement of azo dye film with large photo-induced birefringence and complex refractive indexYiyang Gao0Jacob Y. Ho1Shu-Tuen Tang2Wanlong Zhang3Man-chun Tseng4Olena Vashchenko5Valerii Vashchenko6Fion Yeung7Hoi-Sing Kwok8State Key Laboratory of Advanced Displays and Optoelectronics Technologies, The Hong Kong University of Science and Technology, Hong Kong SAR, ChinaState Key Laboratory of Advanced Displays and Optoelectronics Technologies, The Hong Kong University of Science and Technology, Hong Kong SAR, ChinaState Key Laboratory of Advanced Displays and Optoelectronics Technologies, The Hong Kong University of Science and Technology, Hong Kong SAR, ChinaNanophotonics Research Center, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, ChinaState Key Laboratory of Advanced Displays and Optoelectronics Technologies, The Hong Kong University of Science and Technology, Hong Kong SAR, ChinaState Key Laboratory of Advanced Displays and Optoelectronics Technologies, The Hong Kong University of Science and Technology, Hong Kong SAR, ChinaState Key Laboratory of Advanced Displays and Optoelectronics Technologies, The Hong Kong University of Science and Technology, Hong Kong SAR, ChinaState Key Laboratory of Advanced Displays and Optoelectronics Technologies, The Hong Kong University of Science and Technology, Hong Kong SAR, ChinaState Key Laboratory of Advanced Displays and Optoelectronics Technologies, The Hong Kong University of Science and Technology, Hong Kong SAR, ChinaAzo dyes are valuable functional materials due to their sensitive response to and effective modulation of polarized light. It is essential to find out not only the optical anisotropy but also the complex refractive index of azo dye materials for photonics applications. We report here such measurements of highly ordered photoaligned azo dye films. The film has an apparent dichroic ratio of about 60. We model the photoaligned azo dye film systems using the Berreman transfer matrix. By means of regression fitting of the polarization dependent transmittance and reflectance data, we were able to determine the complex refractive indices of the aligned film at the wavelength range of 400–1000 nm. This material is found to have exceptionally large optical birefringence (Δn ∼ 0.75 at 632.5 nm and Δn ∼ 0.48 at 850.6 nm). The aligned azo dye film is valuable to applications such as coatable polarizers and optical modulation devices.http://dx.doi.org/10.1063/5.0149433 |
| spellingShingle | Yiyang Gao Jacob Y. Ho Shu-Tuen Tang Wanlong Zhang Man-chun Tseng Olena Vashchenko Valerii Vashchenko Fion Yeung Hoi-Sing Kwok Measurement of azo dye film with large photo-induced birefringence and complex refractive index AIP Advances |
| title | Measurement of azo dye film with large photo-induced birefringence and complex refractive index |
| title_full | Measurement of azo dye film with large photo-induced birefringence and complex refractive index |
| title_fullStr | Measurement of azo dye film with large photo-induced birefringence and complex refractive index |
| title_full_unstemmed | Measurement of azo dye film with large photo-induced birefringence and complex refractive index |
| title_short | Measurement of azo dye film with large photo-induced birefringence and complex refractive index |
| title_sort | measurement of azo dye film with large photo induced birefringence and complex refractive index |
| url | http://dx.doi.org/10.1063/5.0149433 |
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