2013
DOI: 10.1002/adom.201300299
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Random Lasing with a High Quality Factor over the Whole Visible Range Based on Cascade Energy Transfer

Abstract: On the basis of cascade energy transfer between different dye molecules, single‐excitation and low threshold coherent random lasing with a high quality factor (∼13 000) over the whole visible range is experimentally observed using gold–silver bimetallic porous nanowires with abundant nanogaps as the scatterers. These nanogaps with different sizes in the bimetallic nanowires can produce continuous plasmonic resonance spectra and provide strong feedback or gain channels for the stimulated emission from different… Show more

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Cited by 61 publications
(32 citation statements)
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“…All the extinction spectra exhibit broadband characteristic over the whole visible spectral range without any obvious resonance peak [20,22], which is in accord with the simulated results ( Figure S4, Supporting Information). Using the broadband enhancement effect induced by the abundant randomly distributed nanogaps with different random sizes in Ag NFs as the scatterers to supply strong gain for optical feedback [20,22], the dyes C440, C153, R6G, and Oz are chosen as the gain media to build colorful random lasing systems, labeled as RL-C440, RL-C153, RL-R6G, and RL-Oz, separately. The photoluminescence spectra of these dyes are centered at approximately 435, 540, 575, and 640 nm, whereas the absorption spectra are centered at approximately 380, 430, 520, and 610 nm, respectively, as shown in Figure 4B.…”
Section: Resultssupporting
confidence: 89%
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“…All the extinction spectra exhibit broadband characteristic over the whole visible spectral range without any obvious resonance peak [20,22], which is in accord with the simulated results ( Figure S4, Supporting Information). Using the broadband enhancement effect induced by the abundant randomly distributed nanogaps with different random sizes in Ag NFs as the scatterers to supply strong gain for optical feedback [20,22], the dyes C440, C153, R6G, and Oz are chosen as the gain media to build colorful random lasing systems, labeled as RL-C440, RL-C153, RL-R6G, and RL-Oz, separately. The photoluminescence spectra of these dyes are centered at approximately 435, 540, 575, and 640 nm, whereas the absorption spectra are centered at approximately 380, 430, 520, and 610 nm, respectively, as shown in Figure 4B.…”
Section: Resultssupporting
confidence: 89%
“…There are more spikes that emerged in the spectra as the pump power densities further increase, as shown in Figure 5A (blue and olive curves). The appearance of sharp spikes indicates building the coherent feedback in random system, resulting from the strong feedback and large enhancement of the local electromagnetic field induced by the nanogaps within Ag NFs [20][21][22]. The probability of coherent random lasing [37,38], defined as the ratio of the number of spectra with coherent modes to the total number of spectra captured, is used to determine the threshold of coherent random lasing as shown in Figure 5B.…”
Section: Resultsmentioning
confidence: 99%
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“…properties and potential applications [1][2][3][4][5][6] . In particular, random lasers based on plasmonic scattering or plasmonic feedback provided by metallic nanostructures have been reported in both solutions and thin films by a number of researchers [7][8][9][10][11][12] .…”
Section: Random Lasers Have Attracted Widespread Attention Because Ofmentioning
confidence: 99%
“…Random laser is a stimulated emission phenomenon observed in disordered media, such as nanoparticles [1,2], biomaterials [3], quantum cascade gain medium [4], semiconductors [5,6], and liquid crystals [7][8][9]. The feedback of random laser is realized by multiple scattering of light.…”
Section: Introductionmentioning
confidence: 99%