Lasing in liquid crystal systems with a deformed lying helix
| Autor: | N. M. Shtykov, I. V. Simdyankin, A. R. Geivandov, S. P. Palto, Vladimir V. Artemov, B. A. Umanskii, Maxim V. Gorkunov, D. O. Rybakov |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
business.industry 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics Atomic and Molecular Physics and Optics Magnetic field 010309 optics Optics Liquid crystal Electric field 0103 physical sciences Helix Perpendicular Periodic boundary conditions Texture (crystalline) 0210 nano-technology business Lasing threshold |
| Zdroj: | Optics letters. 45(15) |
| ISSN: | 1539-4794 |
| Popis: | We report on experimental investigations of the lasing effect in novel chiral liquid crystal (CLC) systems with a deformed lying helix (DLH). The lasing is studied for both odd- and even-order field-induced stop-bands, which are characteristic exclusively of the DLH state. The DLH state is achieved in special CLC cells with periodic boundary conditions, when the surface alignment is flipped between planar and vertical states. The alignment surfaces are prepared using focused ion-beam lithography. In an electric field, such CLC systems undergo an orientational transition, when the initial Grandjean-plane texture with the helix axis perpendicular to the CLC layer is transformed into the DLH state with the helix axis oriented in the plane of the layer. Due to field-induced strong deformation, the DLH system is characterized by a set of photonic stop-bands with a fine spectral structure; namely, on these fine-structured sub-bands, we have observed and studied the low-threshold lasing effect. |
| Databáze: | OpenAIRE |
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