Here we report the fabrication of dye doped polymer stabilized liquid crystals pslcbased smart windows. The demonstration of highq resonances within nfes polymer microfibers is a critical step toward simple, cost effective, highvolume fabrication of wgm. Energy transfer in coumarin 503 dye doped polymer laser. Refractive index dispersion and optical properties of dye. Gain studies of rhodamine 6g dye doped polymer laser.
Processes of dye aggregation in polymers were characterized. Optically switchable gratings based on azodyedoped, polymerdispersed liquid crystals yan jun liu, yue bing zheng, jinjie shi, hua huang, thomas r. Optical characterization of doped thermoplastic and. Multimode laser emission from dyedoped hollow polymer. The study is to determine optical constants and optical band gap of dye doped polystyrene, which had been evaluated and compared between two types of dyes of different concentrations. The solutions of laser dye prepared by dissolving the required amount of the dye in ethanol. It is the excellent optical homogeneity of these materials that is one of the most important features of the dye doped. Optical properties of fluorescent dyedopedpolymer thin film and its application to. Study of degenerate fourwave mixing in disperse orange dye. Pdf optical limiting behavior of sudan iii dye doped. From their studies it was shown that the bleached dye molecular fragments did not absorb in the visible portion of the spectrum. Optical limiting behavior of sudan iii dye doped polymer.
Dyedoped polymers have been studied in detail from the point of view of. Fabrication of microcapsules for dyedoped polymerdispersed. Nonlinear effetcts in dyedoped polymer optical fibres for. Wellresolved multimode laser emission was observed for the first time from a freestanding microring cavity based on rhodamine b dyedoped hollow polymer optical fibre by transverse pumping. We report unusual spectral narrowing and laser emission from polymer thin films doped with coumarin 540 dye. Random laser of r6g dye and tio2 nanoparticals doped in pmma. For this purpose, the synergetic efforts in material engineering sensing materials and optical engineering waveguide design and fabrication are both indispensable. Random lasing from dye doped polymer optical fiber containing. Photobleaching is the lightinducedfragmentation of the active laser dye molecules into components that no longer absorb at the pump wavelength. Copying the complexity of white light requires a more versatile approach. Solid state dye doped polymer is an attractive alternative to the conventional liquid dye solution.
Nearinfrared nir fluorescence sensing is desirable for in vivo biological measurements, but the method is currently limited by the availability of nir fluorescent markers as well as by their poor performance, such as selfaggregation and dim fluorescence, in a physiological environment. Comparisons between the results of both doped polymer optical fibers. Optically switchable gratings based on azodyedoped, polymer. A strip of a liquid crystal elastomer doped with a near. Gain studies of coumarin 307 dye doped polymer laser. Pdf the demonstration of an electrically pumped organic laser remains a major issue of organic optoelectronics for several decades. We observed a spectral narrowing from 42 to 7 nm when the pump energy was. Dye doped polymer fibers obtained from mixed solutions. Energy transfer in a nanoscale multichromophoric system. In this paper, the laser characteristics of rhodamine 6g rh6g doped polymethyl methacrylate pmma rods, modified with ethyl alcohol etoh, are examined by nitrogen laser, and second harmonic nd. Whitelight emission of dyedoped polymer submicronic fibers. Flexible random laser from dye doped stretchable polymer. Alsaidi, raghad jabar, optical properties characterization of celestin blue b dye doped polymer films, j.
A dye doped polymer dispersed liquid crystal pdlc is an attractive material for application in smart windows. Pdf slow light structures in dyedoped polymer waveguides. Optical properties of fluorescent dyedopedpolymer thin. Selecting this option will search all publications across the scitation platform selecting this option will search all publications for the publishersociety in context. Since the pioneering work back in the 1960s and 1970s 1,2,3,4, solidstate dyedoped polymer lasers have found many applications in optical communication devices 5. Nonlinear optical phase conjugation by degenerate fourwave mixing dfwm is an important technique with applications in many fields of science and technology. The first report of the observation of photobleaching in polymer host. Various embodiments provide dye doped polystyrene microspheres generated using dispersion polymerization. Sep 17, 2001 this option allows users to search by publication, volume and page selecting this option will search the current publication in context. Dye doped polymer medium for photonics applications. Polystyrene microspheres may be doped with fluorescent dyes, such as xanthene derivatives including kiton red 620 kr620, using dispersion polymerization.
Preparation of dye doped polymer dispersed liquid crystals using acrylic monomers, and enhancement of contrast by using thf solvent as a cleaning agent. The powder of tio2 was suspended in chloroform and its concentration was estimated based on the known weight fraction of tio2 in the suspension. Polymers free fulltext whitelight emission of dyedoped. Dec 17, 2015 the solidstate ring resonator lasers in this work comprised primarily of the fusedsilica ring resonator hosts and the dye doped high refractive index 1. Homogeneous distribution of polymerizable coumarin dyes. Lessard, and michel bolte characterization of dye doped polymer films as recording materials. In the present work we study the optical properties of a new photonics medium consisted of an epoxy based polymer as matrix. Here, we demonstrate a stretchable and threshold tunable rl by modulating the order degree of the nematic liquid crystal nlc that is caused by the alignment of polymer chain under tensile force. Two different schemes were employed to characterize the optical fiber. The laser emission from the polymer films is found to be highly dependent upon the excitation length of the medium. We have demonstrated the realization of a plasmonic random polymer.
Random lasers rls offer new functionalities inaccessible with conventional lasers, such as an alterable shape and an easy integration with flexible optoelectronic devices. Monodomain film formation and lasing in dyedoped polymer. Pdf gain properties of dyedoped polymer thin films researchgate. Flexible random laser from dye doped stretchable polymer film. It is an irreversible process, which is delirious to laser action in doped polymer hosts.
The fabrication and characterization of a rhodamine 6g doped polymer optical fiber amplifier have been carried out. Nearinfrared fluorescent dyedoped semiconducting polymer. Tunable solidstate lasers incorporating dyedoped, polymer. To address this issue, this paper describes a nir fluorescent polymer dot pdot that emits at 777 nm. The dyedoped polymer nanofibers were fabricated as follows. Electrospun polymer fibers represent an interesting type of such microscopic structures that can be employed in. Flexible random laser from dye doped stretchable polymer film containing nematic liquid crystal guang dai, lei wang, and luogen deng. Especially, the electrically switched diffraction and holographic gratings, have attained much attention by various research groups working in the pdlcrelated display studies.
A blueshift in the mode structure was observed with decrease in fibre diameter. Their influence on photophysical properties and the photochemical stability of dye. Tunable solidstate organic lasers with dye doped polymer gain media have been demonstrated to yield narrowlinewidth,1,2 singlelongitudinalmode3,4 slm emissions in compact multipleprism grating oscillator configurations. In this paper, we have studied the linear optical properties and nonlinear optical phase conjugation properties of two azo dyedoped polymer films by. Smart windows using a pdlc can be operated simply and have a high contrast ratio compared to those of other devices that employed photochromic or thermochromic material.
Keywords bead dye imaging luminescence polymer sensor contents 1 introduction. Nondichroic dye tints the pslc sample in both off and onstate, which is not beneficial for increasing its offon contrast. Reconfigurable solidstate dyedoped polymer ring resonator. A gain medium for producing a light emission in a laser. Slow light structures in dye doped polymer waveguides. Optical properties characterization of celestin blue b dye doped. Dyedoped electrically smart windows based on polymer. In this work, the plasmonic rpfl is fabricated by directly drawing from a laser dye and gold nps system codoped pof. New developments in the dyedoped polymer dispersed liquid. Pdf on jul 1, 2019, k j tahir and others published study optical properties of r6g dye doped in polymer pva find, read and cite all the. Yag laser excitations in a transverse pumping configuration and the variation of small signal. Study of thermoopticproperties of dye doped polymer.
Samples considered for the experiments are rhodamine 6g doped polymethyl. Pdf comparative study on azo dyedoped polymer films for. The repeating group is known as monomer or single unit. Here we report a machzehnder interferometer mzi waveguide with photochromic dyedoped polymer sensing films for uv light detection. Japanese journal of applied physics monodomain film formation and lasing in dye doped polymer cholesteric liquid crystals to cite this article. The sample doped with dichroic dye shows a slight color in the offstate and strong color in the on. Pdf mechanical and thermal studies of brilliant green. Crosslinked, dye doped pva fibers are utilized to sense the ethanol concentration in ethanolwater mixtures and actuation mechanisms are evaluated by comparison to theoretical spectra. The optical homogeneity of these hybrid materials assures a coherent laser action, which is significantly enhanced by the stimulated emission multiply scattered. Slow light structures in dyedoped polymer waveguides.
Photobleaching and its severity in dye lasers were first studied by ippen et ap3. A dyedoped polymerdispersed liquid crystal pdlc is an attractive material for application in smart windows. Fibres with different diameters such as 180, 460, 640 and 800. Osa fabrication and characterization of dyedoped polymer. A flat strip with two ends fixed on substrate surface forms a moving bump under laser scanning. The pdhf polymer was dissolved in thf by stirring overnight under inert atmosphere. Whispering gallery mode emission from dyedoped polymer. For this purpose, our experimental test beds are dyedoped polymer thinfilm lasers based on commer cial laser dyes, namely dcm, rhodamine. Synthesis and investigation of phenol red dye doped polymer films.
Phase conjugation by degenerate fourwave mixing is observed in disperse orange25 dye doped in polymethyl methacrylate metacrylic acid pmmama polymer film under lowpower, continuouswave laser irradiation. Optical properties of fluorescent dyedopedpolymer thin film. Whitelight emission of dyedoped polymer submicronic fibers produced by electrospinning. In figure 2, the absorbance spectra of dye doped polymer films at the concentrations 0. Preparation of dyedoped polymerdispersed liquid crystals. In this paper, the laser characteristics of coumarin 1c1, coumarin 503 and a mixture of c1 and c503 doped polymethyl methacrylate rods modified with ethyl alcohol are studied under nitrogen laser excitation in a transverse pumping configuration and the variation of gain of the dye in solid. The laser emission from the polymer films is found to be highly dependent upon the. Pdf study optical properties of r6g dye doped in polymer pva. Wavelengthconverted waveguiding in dyedoped polymer. New perspectives on disorder in photonic materials are opened up by polyhedral oligomeric silsesquioxanes poss dispersed at a molecular level in dye doped liquid and solid solutions. Us6888862b2 dyedoped polymer nanoparticle gain medium. Study of thermoopticproperties of dye doped polymer this chapter describes the use of thermal lens technique as a quantitative method to determine absolute fluorescence quantum efficiency and concentration quenching of fluorescence emission from dye doped polymer. Degradation mechanism of phosphorescentdyedoped polymer. The nonlinear optical phase conjugation properties are studied using degenerate four wave.
Characterization of dyedoped polymer films as recording. Feb 14, 2008 preparation of the fluorescent dye doped pdhf nanoparticles is performed using a method similar to the reprecipitation method described previously. In this paper the laser characteristics of coumarin 307 c307 doped polymethyl methacrylate rods modified with dioxane are studied under nitrogen laser excitation in a transverse pumping configuration and the variation of gain of the dye in solid medium for different pumping powers is studied. The mechanical parameter such as stressstrain, percent of strain, youngs modulus, tensile strength, and stiffness of the dye doped pva polymer composite films were studied using utm and the. The influence of polymer nature and chemical constitution of organic dyes on photophysical and photochemical properties of these matrices was analyzed. The gain medium comprises a dye doped polymer nanoparticle matrix having an absolute value of dndt less than an absolute value of dndt of its dye doped polymer matrix. The effect of dye doping on pslc contrast was investigated. Angewandte chemie international edition 20, 52 43, 1129411297.
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