SPR Effect Controlled by an Electric Field in a Tapered Optical Fiber Surrounded by a Low Refractive Index Nematic Liquid Crystal
This paper presents the influence of a thin metal layer deposition on the surface of a tapered optical fiber surrounded by a low liquid crystal, on light propagation inside the taper structure. In this research, three types of liquid crystal cells were under investigation: orthogonal, parallel, and...
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MDPI AG
2020-11-01
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| Online Access: | https://www.mdpi.com/1996-1944/13/21/4942 |
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| author | Joanna Korec Karol A. Stasiewicz Leszek R. Jaroszewicz Katarzyna Garbat |
| author_facet | Joanna Korec Karol A. Stasiewicz Leszek R. Jaroszewicz Katarzyna Garbat |
| author_sort | Joanna Korec |
| collection | DOAJ |
| description | This paper presents the influence of a thin metal layer deposition on the surface of a tapered optical fiber surrounded by a low liquid crystal, on light propagation inside the taper structure. In this research, three types of liquid crystal cells were under investigation: orthogonal, parallel, and twist. They differed by the rubbing direction of the electrodes in relation to the fiber axis determining the initial molecule arrangement inside the cell. Gold films with thickness d = 30 nm were deposited on the tapered fiber surface in the tapered waist area. Cells including a tapered optical fiber with no metallic layer were also examined and presented as a reference. All measurements were performed at room temperature for a different steering voltage U from 0 to 200 V, with and without any amplitude modulation with a frequency f = 5 Hz, and the wavelength λ range from 550 to 1200 nm. As a result, the resonant peaks were obtained, which depends on a liquid crystal cell type and steering voltage, as well. This paper shows the possibility of sensing the change of applied voltage by the constructed system. During measurements, additional effects as signal overlapping and intermodal interference were observed reducing measured voltage value. In the future, the improved, similar systems that will have a better response could be used as a sensor of factors to which liquid crystal (LC) will be sensitive, especially temperature and electric field. |
| first_indexed | 2024-03-10T15:07:04Z |
| format | Article |
| id | doaj.art-7659d8f765ad479d821f8f8cf86f8870 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T15:07:04Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-7659d8f765ad479d821f8f8cf86f88702023-11-20T19:40:43ZengMDPI AGMaterials1996-19442020-11-011321494210.3390/ma13214942SPR Effect Controlled by an Electric Field in a Tapered Optical Fiber Surrounded by a Low Refractive Index Nematic Liquid CrystalJoanna Korec0Karol A. Stasiewicz1Leszek R. Jaroszewicz2Katarzyna Garbat3Institute of Applied Physics, Military University of Technology, 00-908 Warsaw, PolandInstitute of Applied Physics, Military University of Technology, 00-908 Warsaw, PolandInstitute of Applied Physics, Military University of Technology, 00-908 Warsaw, PolandInstitute of Chemistry, Military University of Technology, 00-908 Warsaw, PolandThis paper presents the influence of a thin metal layer deposition on the surface of a tapered optical fiber surrounded by a low liquid crystal, on light propagation inside the taper structure. In this research, three types of liquid crystal cells were under investigation: orthogonal, parallel, and twist. They differed by the rubbing direction of the electrodes in relation to the fiber axis determining the initial molecule arrangement inside the cell. Gold films with thickness d = 30 nm were deposited on the tapered fiber surface in the tapered waist area. Cells including a tapered optical fiber with no metallic layer were also examined and presented as a reference. All measurements were performed at room temperature for a different steering voltage U from 0 to 200 V, with and without any amplitude modulation with a frequency f = 5 Hz, and the wavelength λ range from 550 to 1200 nm. As a result, the resonant peaks were obtained, which depends on a liquid crystal cell type and steering voltage, as well. This paper shows the possibility of sensing the change of applied voltage by the constructed system. During measurements, additional effects as signal overlapping and intermodal interference were observed reducing measured voltage value. In the future, the improved, similar systems that will have a better response could be used as a sensor of factors to which liquid crystal (LC) will be sensitive, especially temperature and electric field.https://www.mdpi.com/1996-1944/13/21/4942optical fiberliquid crystalsurface plasmon resonancemetallic layertapered fiber sensor |
| spellingShingle | Joanna Korec Karol A. Stasiewicz Leszek R. Jaroszewicz Katarzyna Garbat SPR Effect Controlled by an Electric Field in a Tapered Optical Fiber Surrounded by a Low Refractive Index Nematic Liquid Crystal Materials optical fiber liquid crystal surface plasmon resonance metallic layer tapered fiber sensor |
| title | SPR Effect Controlled by an Electric Field in a Tapered Optical Fiber Surrounded by a Low Refractive Index Nematic Liquid Crystal |
| title_full | SPR Effect Controlled by an Electric Field in a Tapered Optical Fiber Surrounded by a Low Refractive Index Nematic Liquid Crystal |
| title_fullStr | SPR Effect Controlled by an Electric Field in a Tapered Optical Fiber Surrounded by a Low Refractive Index Nematic Liquid Crystal |
| title_full_unstemmed | SPR Effect Controlled by an Electric Field in a Tapered Optical Fiber Surrounded by a Low Refractive Index Nematic Liquid Crystal |
| title_short | SPR Effect Controlled by an Electric Field in a Tapered Optical Fiber Surrounded by a Low Refractive Index Nematic Liquid Crystal |
| title_sort | spr effect controlled by an electric field in a tapered optical fiber surrounded by a low refractive index nematic liquid crystal |
| topic | optical fiber liquid crystal surface plasmon resonance metallic layer tapered fiber sensor |
| url | https://www.mdpi.com/1996-1944/13/21/4942 |
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