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Adl HP, Sánchez-Díaz J, Vescio G, Cirera A, Garrido B, Pacheco FAV, Żuraw W, Przypis Ł, Öz S, Mora-Seró I, Martínez-Pastor JP, Suárez I. Tailoring Single-Mode Random Lasing of Tin Halide Perovskites Integrated in a Vertical Cavity. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2313252. [PMID: 38445772 DOI: 10.1002/adma.202313252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 03/04/2024] [Indexed: 03/07/2024]
Abstract
The development of random lasing (RL) with predictable and controlled properties is an important step to make these cheap optical sources stable and reliable. However, the design of tailored RL characteristics (emission energy, threshold, number of modes) is only obtained with complex photonic structures, while the simplest optical configurations able to tune the RL are still a challenge. This work demonstrates the tuning of the RL characteristics in spin-coated and inkjet-printed tin-based perovskites integrated into a vertical cavity with low quality factor. When the cavity mode is resonant with the photoluminescence (PL) peak energy, standard vertical lasing is observed. More importantly, single mode RL operation with the lowest threshold and a quality factor as high as 1 000 (twenty times the quality factor of the resonator) is obtained if the cavity mode lies above the PL peak energy due to higher gain. These results can have important technological implications toward the development of low-cost RL sources without chaotic behavior.
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Affiliation(s)
- Hamid Pashaei Adl
- UMDO+, Instituto de Ciencia de los Materiales, University of Valencia, Valencia, 46980, Spain
| | - Jesús Sánchez-Díaz
- Institute of Advanced Materials (INAM), Jaume I University, Castelló de la Plana, 12006, Spain
| | - Giovanni Vescio
- MIND-IN2UB, Department of Electronics and Biomedical Engineering, University of Barcelona, Martí i Franquès 1, Barcelona, 08028, Spain
| | - Albert Cirera
- MIND-IN2UB, Department of Electronics and Biomedical Engineering, University of Barcelona, Martí i Franquès 1, Barcelona, 08028, Spain
| | - Blas Garrido
- MIND-IN2UB, Department of Electronics and Biomedical Engineering, University of Barcelona, Martí i Franquès 1, Barcelona, 08028, Spain
| | | | - Wiktor Żuraw
- Saule Research Institute, Dunska 11, Wroclaw, 54-427, Poland
- Department of Semiconductor Materials Engineering, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, Wroclaw, 50-370, Poland
| | - Łukasz Przypis
- Saule Research Institute, Dunska 11, Wroclaw, 54-427, Poland
- Department of Semiconductor Materials Engineering, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, Wroclaw, 50-370, Poland
| | - Senol Öz
- Saule S.A, Dunska 11, Wroclaw, 54-427, Poland
- Solaveni GmbH, Siemensstraße 42, 59199, Bönen, Germany
| | - Iván Mora-Seró
- Institute of Advanced Materials (INAM), Jaume I University, Castelló de la Plana, 12006, Spain
| | - Juan P Martínez-Pastor
- UMDO+, Instituto de Ciencia de los Materiales, University of Valencia, Valencia, 46980, Spain
| | - Isaac Suárez
- UMDO+, Instituto de Ciencia de los Materiales, University of Valencia, Valencia, 46980, Spain
- Escuela Técnica Superior de Ingeniería, University of Valencia, Valencia, 46100, Spain
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2
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Kumar B, Schulz SA, Sebbah P. Temperature-controlled spectral tuning of a single wavelength polymer-based solid-state random laser. OPTICS EXPRESS 2024; 32:4317-4326. [PMID: 38297635 DOI: 10.1364/oe.505162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 11/23/2023] [Indexed: 02/02/2024]
Abstract
We demonstrate temperature-controlled spectral tunability of a partially-pumped single-wavelength random laser in a solid-state random laser based on DCM [4-dicyanomethylene-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran] doped PMMA (polymethyl methacrylate) dye. By carefully shaping the spatial profile of the pump, we first achieve a low-threshold, single-mode random lasing with an excellent side lobe rejection. Notably, we show how temperature-induced changes in the refractive index of the PMMA-DCM layer result in a blue shift of this single lasing mode. We demonstrate spectral tunability over an 8nm-wide bandwidth.
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3
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Ni D, Späth M, Klämpfl F, Hohmann M. Properties and Applications of Random Lasers as Emerging Light Sources and Optical Sensors: A Review. SENSORS (BASEL, SWITZERLAND) 2022; 23:247. [PMID: 36616846 PMCID: PMC9824070 DOI: 10.3390/s23010247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 12/16/2022] [Accepted: 12/21/2022] [Indexed: 06/17/2023]
Abstract
In a random laser (RL), optical feedback arises from multiple scattering instead of conventional mirrors. RLs generate a laser-like emission, and meanwhile take advantage of a simpler and more flexible laser configuration. The applicability of RLs as light sources and optical sensors has been proved. These applications have been extended to the biological field, with tissues as natural scattering materials. Herein, the current state of the RL properties and applications was reviewed.
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Affiliation(s)
- Dongqin Ni
- Institute of Photonic Technologies (LPT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Konrad-Zuse-Straße 3/5, 91052 Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Paul-Gordan-Straße 6, 91052 Erlangen, Germany
| | - Moritz Späth
- Institute of Photonic Technologies (LPT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Konrad-Zuse-Straße 3/5, 91052 Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Paul-Gordan-Straße 6, 91052 Erlangen, Germany
| | - Florian Klämpfl
- Institute of Photonic Technologies (LPT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Konrad-Zuse-Straße 3/5, 91052 Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Paul-Gordan-Straße 6, 91052 Erlangen, Germany
| | - Martin Hohmann
- Institute of Photonic Technologies (LPT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Konrad-Zuse-Straße 3/5, 91052 Erlangen, Germany
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Paul-Gordan-Straße 6, 91052 Erlangen, Germany
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4
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Rashidi M, Li Z, Jagadish C, Mokkapati S, Tan HH. Controlling the lasing modes in random lasers operating in the Anderson localization regime. OPTICS EXPRESS 2021; 29:33548-33557. [PMID: 34809165 DOI: 10.1364/oe.441003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 09/20/2021] [Indexed: 06/13/2023]
Abstract
Random lasers, which rely on random scattering events unlike traditional Fabry-Pérot cavities, are much simpler and cost-effective to fabricate. However, because of the chaotic fluctuations and instability of the lasing modes, controlling the lasing properties is challenging. In this study, we use random InP nanowire (NW) arrays that operate in the Anderson localization regime with stable modes as the random lasers. We show that by changing the design parameters of the NW arrays, such as filling factor, dimensions of the NWs, degree of randomness, and the size of the array, the properties of the lasing modes including the number of modes, lasing wavelengths, and lasing threshold can be controlled.
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5
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Bouteyre P, Son Nguyen H, Lauret JS, Trippé-Allard G, Delport G, Lédée F, Diab H, Belarouci A, Seassal C, Garrot D, Bretenaker F, Deleporte E. Directing random lasing emission using cavity exciton-polaritons. OPTICS EXPRESS 2020; 28:39739-39749. [PMID: 33379517 DOI: 10.1364/oe.410249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 11/24/2020] [Indexed: 06/12/2023]
Abstract
Random lasing is an intriguing phenomenon occurring in disordered structures with optical gain in which light scattering provides the necessary feedback for lasing action. Unlike conventional lasers, random lasing systems emit in all directions due to light scattering. While this property can be desired in some cases, directional emission remains required for most applications. In a vertical microcavity containing the hybrid perovskite CH3NH3PbBr3, we report here the coupling of the emission of a random laser with a cavity polaritonic resonance, resulting in a directional random lasing, whose emission angles can be tuned by varying the cavity detuning and reach values as large as 15.8° and 22.4°.
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Ye L, Zhao C, Feng Y, Gu B, Cui Y, Lu Y. Study on the Polarization of Random Lasers from Dye-Doped Nematic Liquid Crystals. NANOSCALE RESEARCH LETTERS 2017; 12:27. [PMID: 28078608 PMCID: PMC5226907 DOI: 10.1186/s11671-016-1778-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 12/09/2016] [Indexed: 06/06/2023]
Abstract
Random lasers from dye-doped nematic liquid crystal (DDNLC) cells with different rubbing methods were observed due to different random ring cavities that were formed. Through constructing cells with different rubbing methods on the forward and backward surfaces of light-emitting sides, we can get two random laser beams with different polarization directions from one DDNLC cell at the same time, and the polarization direction is along the rubbing direction of the light-emitting sides. Additionally, the influence of external electric field on the polarization degree of random lasers was also studied.
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Affiliation(s)
- Lihua Ye
- Advanced Photonics Center, Southeast University, Nanjing, Jiangsu, 210096, China.
| | - Chong Zhao
- Advanced Photonics Center, Southeast University, Nanjing, Jiangsu, 210096, China
| | - Yangyang Feng
- Advanced Photonics Center, Southeast University, Nanjing, Jiangsu, 210096, China
| | - Bing Gu
- Advanced Photonics Center, Southeast University, Nanjing, Jiangsu, 210096, China
| | - Yiping Cui
- Advanced Photonics Center, Southeast University, Nanjing, Jiangsu, 210096, China
| | - Yanqing Lu
- College of Engineering, Applied Sciences and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, Jiangsu, 210093, China
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7
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Trull J, Salud J, Diez-Berart S, López DO. Influence of liquid crystalline phases on the tunability of a random laser. Phys Rev E 2017; 95:052704. [PMID: 28618525 DOI: 10.1103/physreve.95.052704] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Indexed: 11/07/2022]
Abstract
In this paper, we report the temperature behavior of an optimized disordered photonic system-based liquid crystal by means of heat capacity and refractive index measurements. The scattering system is formed by a porous borosilicate glass random matrix (about 60%) infiltrated with a smectogenic liquid crystal (about 16%) and a small amount of laser dye (0.1%). The rest of the scattering system is about 24% air, giving rise to a high refractive index contrast scattering system. Such a system has the functionality to change the refractive index contrast with temperature due to the liquid crystal temperature behavior. The system, optically pumped by the second harmonic of a Q-switched Nd:YAG pulsed laser working at 532 nm, exhibits random laser action, the threshold of which depends upon the liquid crystalline mesophase. Temperatures of existence of the smectic-B phase correspond to the most optimized random laser. In such a mesophase, the transport mean free path has been determined as about 16 μm in a coherent backscattering experiment.
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Affiliation(s)
- José Trull
- Grup de Dinàmica no Linial, Òptica no Linial i Lasers (DONLL), Departament de Física, E.S.E.I.A.A.T. Universitat Politècnica de Catalunya, Colom 11, E- 08222 Terrassa, Spain
| | - Josep Salud
- Grup de Propietas Físiques dels Materials (GRPFM), Departament de Física, E.T.S.E.I.B. Universitat Politècnica de Catalunya, Diagonal 647, E-08028 Barcelona, Spain
| | - Sergio Diez-Berart
- Grup de Propietas Físiques dels Materials (GRPFM), Departament de Física, E.T.S.E.I.B. Universitat Politècnica de Catalunya, Diagonal 647, E-08028 Barcelona, Spain
| | - David O López
- Grup de Propietas Físiques dels Materials (GRPFM), Departament de Física, E.T.S.E.I.B. Universitat Politècnica de Catalunya, Diagonal 647, E-08028 Barcelona, Spain
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8
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Chang CH, Kuo CT, Sun HY, Lin SH, Chang CW, Huang SY. All-optically controllable nanoparticle random laser in a well-aligned laser-dye-doped liquid crystal. OPTICS EXPRESS 2016; 24:28739-28747. [PMID: 27958517 DOI: 10.1364/oe.24.028739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This study reports for the first time an all-optically controllable nanoparticle random laser (NPRL) in a well-aligned laser-dye-doped liquid crystal (LDDLC) cell added with NPs and azo-dyes. Experimental results display that the NPRL can be obtained when the pumped energy exceeds the energy threshold (~3.5 μJ/pulse). The occurrence of the NPRL is attributable to the enhancement of the fluorescence by the multi-scattering events of the fluorescence photons from the randomly distributed NPs in the diffusion rout of the well-aligned LDDLC cell. In addition, the lasing intensity of the NPRL can decrease with increasing irradiation time of one UV beam. Continuing irradiation of one green beam following the UV illumination can increasingly recover the lasing intensity of the NPRL. The all-optically reversible controllability of the NPRL is basically attributed to the successive UV-beam-induced increase and green-beam-induced decrease in the randomness of the LDDLC via their interactions with the curved cis and rod-like trans isomers after the accumulation of the trans→cis and cis→trans back isomerizations of the azo-dyes, respectively. The former and latter mechanisms can decrease and increase the laser-dye's absorption and thus the induced spontaneous emission, respectively. These consequences can decrease and increase the lasing intensity, or equivalently, increase and decrease the energy threshold for the occurrence of the NPRL, respectively.
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9
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Wang J, Zhang Y, Cao M, Song X, Che Y, Zhang H, Zhang H, Yao J. Platinum-scatterer-based random lasers from dye-doped polymer-dispersed liquid crystals in capillary tubes. APPLIED OPTICS 2016; 55:5702-5706. [PMID: 27463926 DOI: 10.1364/ao.55.005702] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The resonance characteristics of platinum-scatter-based random lasers from dye-doped polymer-dispersed liquid crystals (DDPDLCs) in capillary tubes were researched for the first time, to the best of our knowledge. After adding platinum nanoparticles (Pt NPs) into the liquid crystal mixtures, the emission spectra of DDPDLCs revealed a lower lasing threshold in comparison with those of DDPDLCs without Pt NPs due to light scattering of liquid crystal droplets and the local field enhancement around Pt NPs. Furthermore, the full width at half-maximum (FWHM) and the lasing threshold were determined by the doping density of the Pt NPs. The threshold was decreased by about half from 17.5 μJ/pulse to 8.7 μJ/pulse on the condition that around 1.0 wt. % was the optimum concentration of Pt NPs doped into the DDPDLCs. The FWHM of the peaks sharply decreased to 0.1 nm. Our work provides an extremely simple method to enhance random lasers from DDPDLCs doped with Pt NPs, and it has potential applications in random fiber lasers or laser displays.
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10
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Sun W, Wang K, Gu Z, Xiao S, Song Q. Tunable perovskite microdisk lasers. NANOSCALE 2016; 8:8717-8721. [PMID: 27064838 DOI: 10.1039/c6nr00436a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Perovskite microdisk lasers have been intensively studied recently. But their lasing properties are usually fixed once the devices are synthesized. Here, for the first time, we demonstrated the switchable and tunable perovskite microdisk lasers by surrounding them with 5CB liquid crystals. With the increase of the environmental temperature from 24 °C to 34 °C, the lasing wavelength slightly changed from 552.91 nm to 552.11 nm at the beginning and suddenly shifted to around 552.54 nm at T = 32 °C, where the phase transition of liquid crystals occurs. Our numerical calculation shows that the wavelength shift is caused by the changes of the refractive index of liquid crystals. More than tuning of the wavelength, a more dramatic wavelength transition from ∼554 nm to 550 nm has also been observed. This sudden transition is mainly induced by the reduction of scattering rather than the change in the refractive index when the liquid crystals are changed from the nematic phase to the isotropic phase. We believe that our research can shed light on the applications of perovskite optoelectronics.
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Affiliation(s)
- Wenzhao Sun
- Integrated Nanoscience Lab, Department of Electrical and Information Engineering, Harbin Institute of Technology, Shenzhen, 518055, China.
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11
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Inversed Vernier effect based single-mode laser emission in coupled microdisks. Sci Rep 2015; 5:13682. [PMID: 26330218 PMCID: PMC4557034 DOI: 10.1038/srep13682] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Accepted: 08/03/2015] [Indexed: 11/29/2022] Open
Abstract
Recently, on-chip single-mode laser emissions in coupled microdisks have attracted considerable research attention due to their wide applications. While most of single-mode lasers in coupled microdisks or microrings have been qualitatively explained by either Vernier effect or inversed Vernier effect, none of them have been experimentally confirmed. Here, we studied the mechanism of single-mode laser operation in coupled microdisks. We found that the mode numbers had been significantly reduced to nearly single-mode within a large pumping power range from threshold to gain saturation. The detail laser spectra showed that the largest gain and the first lasing peak were mainly generated by one disk and the laser intensity was proportional to the wavelength detuning of two set of modes. The corresponding theoretical analysis showed that the experimental observations were dominated by internal coupling within one cavity, which was similar to the recently explored inversed Vernier effect in two coupled microrings. We believe our finding will be important for understanding the previous experimental findings and the development of on-chip single-mode laser.
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12
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Chen LJ, Chuang YJ, Chen C. Thermally tunable amplified spontaneous emission from Cu2ZnSnS4 quantum dot doped photonic cavity by a soft solvothermal route. RSC Adv 2014. [DOI: 10.1039/c4ra01361a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this article, non-toxic Cu2ZnSnS4 quantum dots (CZTSQDs) were synthesized by the solvothermal method and then embedded into a photonic cavity to tune the amplified spontaneous emission.
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Affiliation(s)
- L. J. Chen
- Institute of Electro-Optical Science and Engineering
- National Cheng Kung University
- Tainan, Taiwan
| | - Y. J. Chuang
- Department of Materials Science and Engineering
- National Cheng Kung University
- Tainan, Taiwan
| | - C. Chen
- Department of Chemistry
- National Cheng Kung University
- Tainan, Taiwan
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13
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Lee CR, Lin JD, Huang BY, Lin SH, Mo TS, Huang SY, Kuo CT, Yeh HC. Electrically controllable liquid crystal random lasers below the Fréedericksz transition threshold. OPTICS EXPRESS 2011; 19:2391-2400. [PMID: 21369057 DOI: 10.1364/oe.19.002391] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
This investigation elucidates for the first time electrically controllable random lasers below the threshold voltage in dye-doped liquid crystal (DDLC) cells with and without adding an azo-dye. Experimental results show that the lasing intensities and the energy thresholds of the random lasers can be decreased and increased, respectively, by increasing the applied voltage below the Fréedericksz transition threshold. The below-threshold-electric-controllability of the random lasers is attributable to the effective decrease of the spatial fluctuation of the orientational order and thus of the dielectric tensor of LCs by increasing the electric-field-aligned order of LCs below the threshold, thereby increasing the diffusion constant and decreasing the scattering strength of the fluorescence photons in their recurrent multiple scattering. This can result in the decrease in the lasing intensity of the random lasers and the increase in their energy thresholds. Furthermore, the addition of an azo-dye in DDLC cell can induce the range of the working voltage below the threshold for the control of the random laser to reduce.
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Affiliation(s)
- Chia-Rong Lee
- Institute of Electro-Optical Science and Engineering and Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 701, Taiwan.
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14
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Lee CR, Lin JD, Huang BY, Mo TS, Huang SY. All-optically controllable random laser based on a dye-doped liquid crystal added with a photoisomerizable dye. OPTICS EXPRESS 2010; 18:25896-25905. [PMID: 21164935 DOI: 10.1364/oe.18.025896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
This study investigates, for the first time, an all-optically controllable random laser based on a dye-doped liquid crystal (DDLC) cell added with a photoisomerizable dye. Experimental results indicate that the lasing intensity of this random laser can be all-optically controlled to decrease and increase sequentially with a two-step exposure of one UV and then one green beam. All-optically reversible controllability of the random lasing emission is attributed to the isothermal nematic(N)-->isotropic(I) and I-->N phase transitions for LCs due to the UV-beam-induced trans-->cis and green-beam-induced cis-->trans back isomerizations of the photoisomerizable dye, respectively. The former and the latter can decrease and increase the spatial fluctuations of the order and thus of the dielectric tensor of LCs, respectively, subsequently increasing and decreasing the diffusion constant (or transport mean free path), respectively, and thus decaying and rising the scattering strength for the fluorescence photons in their recurrent multi-scattering process, respectively. The consequent decrease and increase of the lasing intensity for the random laser and thus the rise and descent of its energy threshold are generated, respectively.
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Affiliation(s)
- Chia-Rong Lee
- Institute of Electro-Optical Science and Engineering and Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan, Taiwan 701, Taiwan
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15
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Lee CR, Lin SH, Guo CH, Chang SH, Mo TS, Chu SC. All-optically controllable random laser based on a dye-doped polymer-dispersed liquid crystal with nano-sized droplets. OPTICS EXPRESS 2010; 18:2406-2412. [PMID: 20174070 DOI: 10.1364/oe.18.002406] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
This study elucidates for the first time an all-optically controllable random laser in a dye-doped polymer-dispersed liquid crystal (DDPDLC) with nano-sized LC droplets. Experimental results demonstrate that the lasing intensity of the random laser can be controlled to decrease by increasing irradiation time/intensity of one green beam, and increase by increasing the irradiation time of one red beam. The all-optical controllability of the random laser is attributed to the green (red)-beaminduced isothermal nematic-->isotropic (isotropic-->nematic) phase transition in LC droplets by trans-->cis (cis-->trans back) isomerization of azo dyes. This isomerization may decrease (increase) the difference between the refractive indices of the LC droplets and the polymer, thereby increasing (decreasing) the diffusion constant (or transport mean free path), subsequently decreasing the scattering strength and, thus, random lasing intensity.
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Affiliation(s)
- C-R Lee
- Institute of Electro-Optical Science and Engineering and Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan, Taiwan 701, Republic of China.
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16
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Song Q, Liu L, Xu L, Wu Y, Wang Z. Electrical tunable random laser emission from a liquid-crystal infiltrated disordered planar microcavity. OPTICS LETTERS 2009; 34:298-300. [PMID: 19183637 DOI: 10.1364/ol.34.000298] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Here we report electric-field-induced, wavelength-tunable random lasing action in a liquid-crystal infiltrated disordered planar microcavity. With the increasing of external voltage from 0 V to 30 V, the emission wavelength of the random laser was continuously tuned from 648 nm to 597 nm. It was also tuned back to 648 nm again by reducing the voltage back to 0 V.
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Affiliation(s)
- Qinghai Song
- State Key Lab for Advanced Photonic Materials and Devices, Department of Optical Science and Engineering, Fudan University, Shanghai, China.
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