Effective random laser action in Rhodamine 6G solution with Al nanoparticles

Yang, Liling; Feng, Guoying; Jiang, Yi; Yao, Ke; Deng, Guoliang; Zhou, Shouhuan

doi:10.1364/ao.50.001816

Cited by 40 publications

(16 citation statements)

References 28 publications

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“…3c). It can be noted that the threshold decreases monotonically, as the RhB concentration increases up to 0.004 M. This behavior may be explained by a larger number of gain molecules at higher RhB concentrations, and is consistent with the experimental results in other publications 44, 45 . Comparisons of the measured lasing thresholds against the degrees of SF nanofiber alignment (i.e., AR) and Young’s moduli are shown in Fig.…”

Section: Resultssupporting

confidence: 91%

Random lasing from structurally-modulated silk fibroin nanofibers

Kim

Yang

Choi

et al. 2017

Sci Rep

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Structural arrangement and dimension play vital roles in wave transport and amplification as they can restrict the volume explored by the waves. However, it is challenging to systematically investigate the interplay among structural, optical, and mechanical properties, in part because of limited experimental platforms that modulate the structural arrangement in a continuous manner. We present light amplification action in Rhodamine B doped silk fibroin (SF) nanofibrous scaffolds and its modulation via the control of the alignment or directionality of SF nanofibers through an electrospinning procedure. Random lasing features of such scaffolds are examined as a function of structural arrangement of the SF nanofibers, and optical-structural-mechanical relationships of the SF-based structures are examined. As SF nanofibers are aligned parallel undergoing a transition from three to quasi-two dimension, light amplification features (e.g., lasing threshold and output power) enhanced, which also strongly correlated with mechanical characteristics (i.e., Young’s moduli) of the scaffolds. We confirm such optical characteristics using quasi-mode analyses based on the finite element method. We further demonstrate non-contact, in situ measurement of alternations in lasing features of the scaffolds while the specimens are under tensile loads. These results may highlight potential utility of the scaffolds as a flexible and biocompatible sensor.

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Section: Resultssupporting

confidence: 91%

Random lasing from structurally-modulated silk fibroin nanofibers

Kim

Yang

Choi

et al. 2017

Sci Rep

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“…Over the past decade, plasmonic random lasers have attracted considerable attention because of their great potential for use as display and sensing devices. [1][2][3][4][5][6][7][8] The lasing threshold of a plasmonic random laser is much lower than that of a conventional random laser because of its large scattering cross-section and the localized surface plasmon resonance of the metal nanoparticles (NPs) used in the structure. [9][10][11][12][13] Additionally, red-greenblue (RGB) plasmonic random lasers have been studied as potential multicolor output devices.…”

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confidence: 99%

A RGB random laser on an optical fiber facet

et al. 2017

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“…These peaks appear at different locations and pumping energies, indicating mode competition. To confirm our theoretical predictions, we performed an experiment, where we chose the Al particles as the scattering medium and the Rhodamine-6G (Rh6G) as gain medium [22] . The scattering cross section of Al particles and the module of the refractive index of the Al particles are relatively large.…”

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confidence: 94%

Random lasing in strongly disordered medium

Yao¹,

Feng²,

Yang³

et al. 2012

中国光学快报

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Using the time-dependent theory, we calculate the random-laser emission spectra in a two-dimensional strongly disordered medium. The calculation results show that in low dimensional systems, such as thinfilm disordered media and planar waveguides, the larger the difference of the refractive indices between the scattering and background media, the smaller the lasing threshold. We also reveal the existence of multimode survival and mode competition. We experimentally obtain the emission spectra of a dye solution with Al particles doped at different pumping energies, and the experimental results agree well with the calculated ones.OCIS codes: 290.4210, 140.3430, 300.6500. doi: 10.3788/COL201210.082901.In 1968, Letokhov first calculated the optical properties of a disordered medium and predicted the possibility of random lasing in disordered systems with gain. Since then, the random-laser action has been widely studied.Numerous theoretical [1−9] and experimental [10−18] investigations on random lasers have been made. Lawandy et al. discovered random emission in colloidal solutions in 1994 [10] . Then, Cao et al. observed the stimulated emission phenomenon in ZnO powders [11] . With the discovery of random lasers, many theoretical explanations for such laser phenomenon have been proposed, mainly including the diffusion equation with gain [2,17] . Anderson localized model, and time-dependent theory [3,19] . Letokhov established the diffusion equations with gain and successfully explained the exponential growth of photon energy density. Jiang et al. proposed the time-dependent theory using the finite-difference time domain (FDTD) algorithm to solve rate and Maxwell's equations numerically [3] . Using the time-dependent theory, we intuitively and comprehensively investigated the coherent feedback properties of random emission [20,21] . In this letter, using the time-dependent theory, we calculated the dependence of random lasing on the refractive indices of the scattering media. The calculation results show that when the pumping energy is relatively small, the peak intensity of the output spectrum changes slowly with the pumping energy and the full-width at half maximum (FWHM) is relatively large. When the pumping energy is increased to a certain value, the peak intensity exhibits exponential growth and the FWHM rapidly decreases. When the pumping energy is further increased, the peak intensity and FWHM reach and maintain certain values. Thus, in low dimensional systems, the larger the difference of the refractive indices of the scattering and background media, the smaller the lasing threshold. Moreover, we observed that the number of peaks in the emission spectrum increased as the pumping energy increased. These peaks appear at different locations and pumping energies, indicating mode competition. To confirm our theoretical predictions, we performed an experiment, where we chose the Al particles as the scattering medium and the Rhodamine-6G (Rh6G) as gain medium [22] . The scattering cross section of Al particles and...

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Effective random laser action in Rhodamine 6G solution with Al nanoparticles

Cited by 40 publications

References 28 publications

Random lasing from structurally-modulated silk fibroin nanofibers

Random lasing from structurally-modulated silk fibroin nanofibers

A RGB random laser on an optical fiber facet

Random lasing in strongly disordered medium

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