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Saadaoui L, Yang D, Wang Y, Hassan F, Drevensek-Olenik I, Zhang X, Gan Z, Li Y, Xu J. Electrically Tunable Two-Color Cholesteric Laser. Polymers (Basel) 2023; 15:4656. [PMID: 38139908 PMCID: PMC10747753 DOI: 10.3390/polym15244656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 11/21/2023] [Accepted: 12/07/2023] [Indexed: 12/24/2023] Open
Abstract
Two-color lasing emission from an asymmetric structure, consisting of two dye-doped cholesteric liquid crystal (DD-CLC) layers separated by a transparent interlayer, is demonstrated. The DD-CLC mixtures have different reflection bands with long-wavelength band edges located at the green and red wavelengths of the visible spectrum, respectively. For the laser action, the CLC hosts provide the feedback, and the fluorescent laser dyes represent the active medium. When the stacked structure is optically pumped above the threshold, two simultaneous laser lines separated by 123 nm are observed at the long-wavelength band edges of the DD-CLC mixtures. The influence of an electric field on lasing behavior is also analyzed and discussed in terms of the reflection spectrum and laser action. The results show a reversible tuning of the reflection band, accompanied by a modification of the lasing characteristics under the application of an external field. Above a specific threshold voltage, one of the emission lines is suppressed and the other is conserved. With a further increase in the voltage, both laser emissions are entirely inhibited. The investigated structure demonstrates a simple technique to obtain an electrically tunable multi-wavelength laser, which might pave the way for a new generation of organic laser sources.
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Affiliation(s)
- Lotfi Saadaoui
- The MOE Key Laboratory of Weak-Light Nonlinear Photonics and International Sino-Slovenian Join Research Center on Liquid Crystal Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China; (L.S.); (D.Y.); (Y.W.); (F.H.); (Z.G.); (Y.L.); (J.X.)
- Physics Laboratory of Soft Matter and Electromagnetic Modelling, Faculty of Sciences of Tunis, University of Tunis El Manar, Tunis 2092, Tunisia
| | - Donghao Yang
- The MOE Key Laboratory of Weak-Light Nonlinear Photonics and International Sino-Slovenian Join Research Center on Liquid Crystal Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China; (L.S.); (D.Y.); (Y.W.); (F.H.); (Z.G.); (Y.L.); (J.X.)
| | - Yu Wang
- The MOE Key Laboratory of Weak-Light Nonlinear Photonics and International Sino-Slovenian Join Research Center on Liquid Crystal Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China; (L.S.); (D.Y.); (Y.W.); (F.H.); (Z.G.); (Y.L.); (J.X.)
| | - Faheem Hassan
- The MOE Key Laboratory of Weak-Light Nonlinear Photonics and International Sino-Slovenian Join Research Center on Liquid Crystal Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China; (L.S.); (D.Y.); (Y.W.); (F.H.); (Z.G.); (Y.L.); (J.X.)
| | - Irena Drevensek-Olenik
- Faculty of Mathematics and Physics, University of Ljubljana, SI-1000 Ljubljana, Slovenia
- Department of Complex Matter, J. Stefan Institute, SI-1000 Ljubljana, Slovenia
| | - Xinzheng Zhang
- The MOE Key Laboratory of Weak-Light Nonlinear Photonics and International Sino-Slovenian Join Research Center on Liquid Crystal Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China; (L.S.); (D.Y.); (Y.W.); (F.H.); (Z.G.); (Y.L.); (J.X.)
- Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
| | - Zenghua Gan
- The MOE Key Laboratory of Weak-Light Nonlinear Photonics and International Sino-Slovenian Join Research Center on Liquid Crystal Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China; (L.S.); (D.Y.); (Y.W.); (F.H.); (Z.G.); (Y.L.); (J.X.)
| | - Yigang Li
- The MOE Key Laboratory of Weak-Light Nonlinear Photonics and International Sino-Slovenian Join Research Center on Liquid Crystal Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China; (L.S.); (D.Y.); (Y.W.); (F.H.); (Z.G.); (Y.L.); (J.X.)
| | - Jingjun Xu
- The MOE Key Laboratory of Weak-Light Nonlinear Photonics and International Sino-Slovenian Join Research Center on Liquid Crystal Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China; (L.S.); (D.Y.); (Y.W.); (F.H.); (Z.G.); (Y.L.); (J.X.)
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