Regenerated cellulose as a porous silica composite template for random laser emission

Alves, Caroline Cássia; Mendonça, Cleber Renato; Boni, Leonardo De; Caiut, José Maurício A.

doi:10.1007/s10854-019-01461-3

Cited by 3 publications

(11 citation statements)

References 27 publications

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“…[85] Such a coherent multiple light scattering in a random medium, on the other hand, allows light to be trapped within the material. [86,87] This increases the photon lifetime, which in turn can be enhanced by a gain medium. Such a scattering distribution in combination with light amplification is one of the basic principles of random lasers.…”

Section: Disordered Photonic Structuresmentioning

confidence: 99%

“…Such a scattering distribution in combination with light amplification is one of the basic principles of random lasers. [86] This unique laser mechanism, is also known as feedback due to light scattering. In conventional lasers, the feedback is generated by static reflecting mirrors, whereas in random lasers it is caused by random scatterers.…”

Section: Disordered Photonic Structuresmentioning

confidence: 99%

“…[89] Nowadays, different materials can be used to create scattering media such as glass, ceramics, oxide particles, mesoporous materials, as well as cellulose-based materials. [86] In addition, various fluorophores such as dyes like rhodamine, or rare earth elements and semiconductors, as well as quantum dots can be selected as laser gain media. [86,90] Laser dyes are interesting because of their high absorption cross-section in the visible spectrum and the wide wavelength emission range.…”

Section: Disordered Photonic Structuresmentioning

confidence: 99%

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Cellulose for Light Manipulation: Methods, Applications, and Prospects

Reimer

Zollfrank

2021

Advanced Energy Materials

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The colors of plants and animals can be achieved by different interactions of light with matter. [10][11][12][13][14][15][16][17] Animals or plants use the biological system colors as warning, for camouflage, or for signaling. Coloration can be generated by the selective absorption of light from the visible range of the spectrum by using pigments (pigmentary colors), which are absorbing subsets of the visible spectrum and transmitting and reflecting the other parts of the visible light. Therefore, the tissue occurs in the color of the wavelength of the reflected radiation. This is used for example by flowers of plants as a signal, because they have to stand out against the background of the vegetation in order to attract pollinating insects. Therefore, they appear in bright colors by reflecting certain wavelengths of visible light, which are then perceivable for the pollinating insects as well as for humans. [10][11][12][13] However, light-matter interaction with respect to absorption is of general importance, but will not be further discussed in this review. On the other hand, coloration can be created by coherent or incoherent scattering of light on highly structured and unstructured tissues (structural colors) in the range of the wavelength of incident light. Here, different wavelengths of light are selectively reflected from a structure and the remaining wavelengths can then be transmitted or absorbed. [10][11][12][13][14][15] These biological photonic sub-micrometer structures yield a distinct coloration through the creation of a refractive index contrast between the used materials. This is an interesting fact, because natural systems cannot be built on high-refractive index inorganic materials, which are commonly used in contemporary technology. Instead, nature makes use of biopolymers such as keratin, chitin, collagen, and cellulose. However, all of these biopolymers exhibit a refractive index around ≈1.5. In order to be able to create bright structural colors, a high refractive index contrast is required. Therefore, nature is using air voids to create the necessary refractive index contrast (Δn ≈ 0.5). Alternatively, nature can also use melanin with a refractive index of about 2 and keratin in mixed composites or by using anhydrous guanine with a refractive index of 1.83, whose crystal arrangements are responsible for the metallic luster of many fish. [15,16] Pigmentary color as well as structural color can also occur in combination (combined colors). All of these aspects can also be separated in iridescent or noniridescent colors. [10,15] Birds, like the Panama Amazon parrot (Amazona ochrocephala panamensis) or the kingfisher (Alcedo atthis) are using different combinations of pigments and sub-micrometer structured components.Cellulose is one of the most abundant biopolymers on earth. It is a sustainable and renewable raw material with many beneficial properties. Due to its availability, nontoxicity, environmental friendliness, biocompatibility, and biodegradability, cellulose is one of the world's most ...

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Section: Disordered Photonic Structuresmentioning

confidence: 99%

Section: Disordered Photonic Structuresmentioning

confidence: 99%

Section: Disordered Photonic Structuresmentioning

confidence: 99%

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Cellulose for Light Manipulation: Methods, Applications, and Prospects

Reimer

Zollfrank

2021

Advanced Energy Materials

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“…S5(b) † that Q sca for r ¼ 235 nm (green line, corresponding to PZM3) and r ¼ 325 nm (blue line, corresponding to PZM4) has become relatively high and takes the maximum in the vicinity of the wavelength of random laser oscillation peaks. In particularly, the random laser oscillation from the porous structure was closely correlated with the pore size, 25,26 and then, the multiple scattering effect inside Z4 (PZM4) became highly efficient for random laser oscillation from RhB, 19,27,53 which would result in the lowering of I th .…”

Section: Resultsmentioning

confidence: 99%

“…To avoid such a problem, it is rationally effective to adopt a random medium with porous structure as a scatterer. [24][25][26] An optical path length is extended in a porous structure, and then, the excitation volume of the optical amplifying medium is also enlarged. As a result, the optical path length will be repeatedly extended further.…”

Section: Introductionmentioning

confidence: 99%