Dynamic Control of Third-order Nonlinear Optical Properties of Gold Nanoparticle/Liquid Crystal Composites under External Electric Fields
Fuente:
arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Acceso en línea: | |
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| _version_ | 1866915151840542720 |
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| author | Wang, Shengwei Gharbi, Mohamed Amine Yelleswarapu, Chandra S |
| author_facet | Wang, Shengwei Gharbi, Mohamed Amine Yelleswarapu, Chandra S |
| contents | This study investigates the dynamic control of third-order nonlinear optical absorption properties of gold nanoparticles (AuNPs) dispersed in nematic liquid crystals (LC). By leveraging the reconfigurable nature of liquid crystals under external electric fields, we demonstrate the ability to manipulate AuNP alignment, dimer formation, and subsequently the plasmon coupling effects. Planar oriented and degenerate LC cells were prepared, and their optical responses under varying electric fields were characterized using polarization microscopy, UV-VIS spectroscopy, and Z-scan techniques. In planar cells, the applied electric field reorients LC molecules and AuNPs, influencing plasmon coupling and the nonlinear absorption. Conversely, degenerate cells exhibit more complex behaviors due to multiple LC alignment directions. These findings illustrate the potential of AuNP/nematic LC systems for creating tunable photonic devices responsive to external stimuli. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_05736 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dynamic Control of Third-order Nonlinear Optical Properties of Gold Nanoparticle/Liquid Crystal Composites under External Electric Fields Wang, Shengwei Gharbi, Mohamed Amine Yelleswarapu, Chandra S Soft Condensed Matter Optics This study investigates the dynamic control of third-order nonlinear optical absorption properties of gold nanoparticles (AuNPs) dispersed in nematic liquid crystals (LC). By leveraging the reconfigurable nature of liquid crystals under external electric fields, we demonstrate the ability to manipulate AuNP alignment, dimer formation, and subsequently the plasmon coupling effects. Planar oriented and degenerate LC cells were prepared, and their optical responses under varying electric fields were characterized using polarization microscopy, UV-VIS spectroscopy, and Z-scan techniques. In planar cells, the applied electric field reorients LC molecules and AuNPs, influencing plasmon coupling and the nonlinear absorption. Conversely, degenerate cells exhibit more complex behaviors due to multiple LC alignment directions. These findings illustrate the potential of AuNP/nematic LC systems for creating tunable photonic devices responsive to external stimuli. |
| title | Dynamic Control of Third-order Nonlinear Optical Properties of Gold Nanoparticle/Liquid Crystal Composites under External Electric Fields |
| topic | Soft Condensed Matter Optics |
| url | https://arxiv.org/abs/2502.05736 |