Temperature-Dependent Polarization Characterization and Birefringence Inversion in Super-Twisted Nematic Liquid Crystals
The temperature-dependent polarization performance of super-twisted nematic liquid crystals (STN-LCs) when used as polarizers has garnered considerable scholarly attention. In this study, the transmittance of an STN-LC cell was measured under incident light wavelengths of 650 nm, 532 nm, and 405 nm...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-07-01
|
| Series: | Photonics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2304-6732/12/7/683 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849732796608675840 |
|---|---|
| author | Houtong Liu Bin Wang Minjuan Mao Yuanyuan Qian Dan Wang |
| author_facet | Houtong Liu Bin Wang Minjuan Mao Yuanyuan Qian Dan Wang |
| author_sort | Houtong Liu |
| collection | DOAJ |
| description | The temperature-dependent polarization performance of super-twisted nematic liquid crystals (STN-LCs) when used as polarizers has garnered considerable scholarly attention. In this study, the transmittance of an STN-LC cell was measured under incident light wavelengths of 650 nm, 532 nm, and 405 nm over the temperature range of 30 °C to 100 °C. The STN-LC cell was employed both as the sample under test and as an analyzer in a rotational measurement setup to investigate how its polarization properties vary with temperature. The results indicate that the LC cell exhibits the characteristics of a linear polarizer under red light (650 nm) and violet laser (405 nm) across the full temperature range. However, under green laser (532 nm), when the temperature exceeds 60 °C, its extinction ratio is poor, suggesting its unsuitability for polarization applications under such conditions. A birefringence inversion formula was derived using the transmittance difference method, which effectively eliminates the influence of the glass substrates on the measured transmittance of the LC layer. Utilizing this method, a simple optical setup consisting of a polarizer and photodetector was constructed to accurately extract the birefringence of the LC. The birefringence of super-twisted nematic liquid crystal can be obtained by the transmittance difference method, which is low-cost, has a simple optical path, and is convenient for temperature-controlled experimental measurements of the liquid crystal cell. The findings of this study provide methodological support for the precise determination of birefringence in LCs exhibiting linear polarization characteristics. |
| format | Article |
| id | doaj-art-d2c5d96a776c41789b4bb3ccbea752a1 |
| institution | DOAJ |
| issn | 2304-6732 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj-art-d2c5d96a776c41789b4bb3ccbea752a12025-08-20T03:08:13ZengMDPI AGPhotonics2304-67322025-07-0112768310.3390/photonics12070683Temperature-Dependent Polarization Characterization and Birefringence Inversion in Super-Twisted Nematic Liquid CrystalsHoutong Liu0Bin Wang1Minjuan Mao2Yuanyuan Qian3Dan Wang4School of Microelectronics & Data Science, Anhui University of Technology, Maanshan 243002, ChinaSchool of Microelectronics & Data Science, Anhui University of Technology, Maanshan 243002, ChinaZhejiang Meteorology Science Institute, Hangzhou 310017, ChinaSchool of Microelectronics & Data Science, Anhui University of Technology, Maanshan 243002, ChinaSchool of Microelectronics & Data Science, Anhui University of Technology, Maanshan 243002, ChinaThe temperature-dependent polarization performance of super-twisted nematic liquid crystals (STN-LCs) when used as polarizers has garnered considerable scholarly attention. In this study, the transmittance of an STN-LC cell was measured under incident light wavelengths of 650 nm, 532 nm, and 405 nm over the temperature range of 30 °C to 100 °C. The STN-LC cell was employed both as the sample under test and as an analyzer in a rotational measurement setup to investigate how its polarization properties vary with temperature. The results indicate that the LC cell exhibits the characteristics of a linear polarizer under red light (650 nm) and violet laser (405 nm) across the full temperature range. However, under green laser (532 nm), when the temperature exceeds 60 °C, its extinction ratio is poor, suggesting its unsuitability for polarization applications under such conditions. A birefringence inversion formula was derived using the transmittance difference method, which effectively eliminates the influence of the glass substrates on the measured transmittance of the LC layer. Utilizing this method, a simple optical setup consisting of a polarizer and photodetector was constructed to accurately extract the birefringence of the LC. The birefringence of super-twisted nematic liquid crystal can be obtained by the transmittance difference method, which is low-cost, has a simple optical path, and is convenient for temperature-controlled experimental measurements of the liquid crystal cell. The findings of this study provide methodological support for the precise determination of birefringence in LCs exhibiting linear polarization characteristics.https://www.mdpi.com/2304-6732/12/7/683super-twisted nematic liquid crystal (STN-LC)transmittance difference methodrotational measurement methodbirefringence |
| spellingShingle | Houtong Liu Bin Wang Minjuan Mao Yuanyuan Qian Dan Wang Temperature-Dependent Polarization Characterization and Birefringence Inversion in Super-Twisted Nematic Liquid Crystals Photonics super-twisted nematic liquid crystal (STN-LC) transmittance difference method rotational measurement method birefringence |
| title | Temperature-Dependent Polarization Characterization and Birefringence Inversion in Super-Twisted Nematic Liquid Crystals |
| title_full | Temperature-Dependent Polarization Characterization and Birefringence Inversion in Super-Twisted Nematic Liquid Crystals |
| title_fullStr | Temperature-Dependent Polarization Characterization and Birefringence Inversion in Super-Twisted Nematic Liquid Crystals |
| title_full_unstemmed | Temperature-Dependent Polarization Characterization and Birefringence Inversion in Super-Twisted Nematic Liquid Crystals |
| title_short | Temperature-Dependent Polarization Characterization and Birefringence Inversion in Super-Twisted Nematic Liquid Crystals |
| title_sort | temperature dependent polarization characterization and birefringence inversion in super twisted nematic liquid crystals |
| topic | super-twisted nematic liquid crystal (STN-LC) transmittance difference method rotational measurement method birefringence |
| url | https://www.mdpi.com/2304-6732/12/7/683 |
| work_keys_str_mv | AT houtongliu temperaturedependentpolarizationcharacterizationandbirefringenceinversioninsupertwistednematicliquidcrystals AT binwang temperaturedependentpolarizationcharacterizationandbirefringenceinversioninsupertwistednematicliquidcrystals AT minjuanmao temperaturedependentpolarizationcharacterizationandbirefringenceinversioninsupertwistednematicliquidcrystals AT yuanyuanqian temperaturedependentpolarizationcharacterizationandbirefringenceinversioninsupertwistednematicliquidcrystals AT danwang temperaturedependentpolarizationcharacterizationandbirefringenceinversioninsupertwistednematicliquidcrystals |