Biomimetic Random Lasers with Tunable Spatial and Temporal Coherence

Ghofraniha, Neda; Volpe, L.; Opdenbosch, Daniel Van; Zollfrank, Cordt; Conti, Claudio

doi:10.1002/adom.201600649

Cited by 16 publications

(14 citation statements)

References 38 publications

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“…As previously reported in ref. 13, which also employed Rh6G as the gain medium, the increasing pumping energy induces re-absorption and reemission of uorescence, resulting in a bathochromic shi, as clearly seen in Fig. 4(b).…”

Section: Random Laser Behaviormentioning

confidence: 91%

“…In search of exible coherent sources of light, cellulose or biomaterial substrates have been demonstrated using different fabrication methods and a combination of scatterers/gain media, including metallic nanoscatterers which can lead to scattering enhancement due to localized surface plasmons. [5][6][7][8][9][10][11][12][13][14] In particular, the use of electrospinning, a high electric eldbased technique that provides massive production of microand nanobers, represents a promising low cost method to be incorporated in integrated micro-and nanophotonic devices, 15 which can be used in exible matrices. These liform structures with a refractive index of about 1.5 provide waveguiding/ scattering along the bers as well as multidirectional propagation, due to their disordered structures 16 which depends on the ber diameter scale.…”

Section: Introductionmentioning

confidence: 99%

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A random laser based on electrospun polymeric composite nanofibers with dual-size distribution

et al. 2019

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Section: Random Laser Behaviormentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

A random laser based on electrospun polymeric composite nanofibers with dual-size distribution

et al. 2019

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“…As a new type of laser, random lasers utilize multiple scattering to achieve stimulated radiation amplification, avoiding the complex manufacturing process and high cost of conventional resonators [6][7][8][9][10][11][12] . Random lasers have becoming a hot research field in the international laser science community due to their special characteristics of low cost, small size and ease of integration, demonstrating versatile application prospects in bio-detection 13,14 , information security 15 , and integrated photoelectron 16 .…”

Section: Introductionmentioning

confidence: 99%

A ring-shaped random laser in momentum space

Bian

Shi

et al. 2020

Nanoscale

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A color-switchable random laser is designed through directly coupling random laser with a commercial optical fiber. By using a simple approach of selectively coating the random gain layer on the surface of fiber, the red and yellow random lasers are respectively achieved with low threshold and good emission direction due to the guiding role of optical fibers. Moreover, the unique coupling mechanism leads to the random lasing with ring-shape in momentum space, indicating an excellent illuminating source for high-quality imaging with an extremely low speckle noise. More importantly, random lasing with different colors can be flexible obtained by simply moving the pump position. The results may promote random lasers' practical applications in the fields of sensing, in vivo biologic imaging, high brightness full-field illuminating. Experimental MethodsThe fabrication process of the fiber source is illustrated in Fig. 1a. The typical gain materials used in this experiment are: 4-(Dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulolidin-4-yl-vinyl) -4H-pyran(DCJTB, Tokyi Chemical Industry) and Pyrromethene567 (PM567, Sigma). The fabricated process of the fiber source is simply supplied as follows. First, polydimethylsiloxane (PDMS, n = 1.41) solution is mixed with cross-linking solution with the ratio of 1:10. Then, TiO 2 nanoparticles are dispersed in the dye-doped acetone solution (DCJTB at 1.5 mg mL -1 or PM567 at 1.25 mg mL -1 ) to obtain TiO 2 dispersion with a concentration of 0.9 mg mL -1 . The dye-doped TiO 2 dispersion and PDMS are mixed at a volume ratio of 1: 5 in an ultrasonic tank for 15 min and then vacuum them for 40 min to remove the air bubble. Finally, the mixture is dipped onto a clean fiber (TAIHAN Fiber Optics) to flow naturally. The length of the fiber is about 60 mm, the core diameter is 50 μm and the diameter of the cladding is 125 μm. The refractive indexes of the core and cladding layer are 1.54 and 1.52, respectively. The sample is placed in a drying oven at 80 °C for 3 hours to complete the cross-linking polymerization and drying. After cooling to room temperature, a fiber source is realized. Random lasers with different colors can be fabricated by coating different dye polymers at different locations on the surface of the fiber. And the polymer film with different thicknesses can be fabricated by controlling the dipping times.Acs Nano, 2017, 11. 36.

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“…The study of multiple scattering in resonant regimes is not only relevant from a fundamental point of view, [6][7][8][9] but also led to outstanding technological progresses including image reconstruction, [10] low-cost spectral analysis, [11,12] and random lasers. [13][14][15] Due to the large penetration depth in biological tissues, applying these new ideas in the THz frequency range is specifically relevant for biomedical and biophysical applications. [16][17][18] However the study of THz wave transport in random media is still at its infancy.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Radiation Transport in Photonic Glasses

et al. 2020

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Multiple scattering of electromagnetic (EM) waves arises in disordered media with a refractive index varying on the scale of the wavelength. The diffusion approximation is a powerful tool to treat multiple scattering as a photon random walk, neglecting resonant phenomena. However, as the light intensity varies on a scale much smaller than the transport mean free path, resonances may occur in media formed by finite-size scatterers and break the diffusion approximation. The energy and phase velocity are very useful tools to reveal the onset of the resonant transport regime. In this paper the study of the propagation of terahertz (THz) waves through 3D random media by employing terahertz time-domain spectroscopy (THz-TDS) is addressed. Specifically, measurements of the electric field transmitted by samples of different thicknesses made of 1 mm diameter silica spheres dispersed in a paraffin matrix at different filling fractions are reported. This investigation has provided an accurate measurement of the EM field phase and, hence, information on the radiation propagation velocity that has enabled the first observation of a photonic glass at the THz range.

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Biomimetic Random Lasers with Tunable Spatial and Temporal Coherence

Cited by 16 publications

References 38 publications

A random laser based on electrospun polymeric composite nanofibers with dual-size distribution

A random laser based on electrospun polymeric composite nanofibers with dual-size distribution

A ring-shaped random laser in momentum space

Terahertz Radiation Transport in Photonic Glasses

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