Surface Plasmon Resonance Dependent Third-Order Optical Nonlinearities of Silver Nanoplates

Condorelli, Marcello; Scardaci, Vittorio; Pulvirenti, Mario; D’Urso, Luisa; Neri, F.; Compagnini, Giuseppe; Fazio, Eugenio

doi:10.3390/photonics8080299

Cited by 10 publications

(4 citation statements)

References 26 publications

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“…The blue Ag NPc sample obtained by reduction with sodium borohydride has a UV-Vis spectrum (Figure 4D) with a broad absorption band, centered at 818 nm. The positioning of the SPR, at a wavelength higher than 800 nm, is specific to silver nanoparticles with triangular morphology (Condorelli et al, 2021). For the yellow Ag NPt sample, the UV-Vis spectrum (Figure 4E) indicates the position of the band corresponding to the SPR at 426 nm.…”

Section: Uv-vismentioning

confidence: 96%

Alternative mitigating solutions based on inorganic nanoparticles for the preservation of cultural heritage

Corbu,

Dumbravă,

Marinescu

et al. 2023

Front. Mater.

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Introduction: Biodeterioration is a big challenge for the preservation of cultural heritage objects and for the community’s safety, fostering the search for novel methods effective in removing microbial biofilms and subsequent biodeterioration. In this context, nanoparticles (NPs) are considered an interesting alternative, based on their unique physico-chemical and biological properties.Methods: The present study aimed to evaluate the antimicrobial efficiency of Ag, Au, Cu, and ZnO NPs against a significant number of filamentous fungi and bacterial strains isolated from wooden and stone cultural heritage objects from different Romanian regions, as well as from museum collections, with the final goal to establish their potential to develop novel preservation strategies, which have high efficiency and low ecotoxicity.Results: Six types of nanoparticles (NPs) based on Ag, Au, Cu, and ZnO were synthesized and characterized for their physico-chemical properties, ecotoxicity, and efficacy against 75 filamentous fungi and 17 bacterial strains isolated from wooden and stone cultural heritage objects (15th–19th century). The results showed that all synthetized NPs are homogeneous, demonstrating a good stabilizing coating, and have spherical or triangular shapes, with sizes between 9 and 25 nm. The highest antifungal efficiency has been recorded for Ag NPs, followed by Cu NPs and ZnO NPs, with the most susceptible strains being Aspergillus montevidensis, Penicillium commune, Penicillium corylophilum, Bacillus megaterium, and B. cereus. The Cu NPs and ZnO NPs decreased the capacity of microbial strains to adhere to the inert substratum. The influence of the tested NPs against enzyme/organic acid production varied depending on the NP types and by species.Conclusion: The obtained results are promising for the development of efficient and economical alternative solutions for heritage preservation, showing high antimicrobial activity against the prevalent fungal and bacterial strains involved in the biodeterioration of Romanian heritage objects.

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Section: Uv-vismentioning

confidence: 96%

Alternative mitigating solutions based on inorganic nanoparticles for the preservation of cultural heritage

Corbu,

Dumbravă,

Marinescu

et al. 2023

Front. Mater.

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“…The plasmon-assisted enhanced nonlinear refraction was studied before in several works. [25,26] For example, in the study by Lama et al, [26] the nonlinear refraction for monodispersed Ag NPs was measured using two different excitation wavelengths, close to and far from the surface plasmon resonance of Ag NPs. However, it cannot be considered as a direct indication of the plasmon effect in enhancing the nonlinear optical properties, as, in general, the optical properties of any material are wavelength dependent.…”

Section: Determination Of Nonlinear Optical Parametersmentioning

confidence: 99%

Laser Light Durability and Nonlinear Optical Properties of Acrylate Polymer−Chalcogenide Glass−Gold Nanocomposites

Burunkova

Alkhalil

Tcypkin

et al. 2022

Physica Status Solidi (a)

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Synthesis of acrylate‐based nanocomposites (NCs) for photonic applications is performed, and the influence of gold and chalcogenide glass nanoparticles (NPs) on optical parameters of NC layers at high laser intensities is investigated, whereas the polymerization, recording of optical gratings or other elements, and variations of their functional parameters in As2S3 and Au‐containing NC layers are possible at low, 532 nm laser light intensities in the absorption edge range; optical stability under high intensity illumination and threshold laser damage intensities in NIR optical transmission range are important for nonlinear optical experiments, measurements of n2. Hence, these parameters are determined and show the increase in NCs’ stability due to the addition of Au NPs, as well as increase in n2 in gold‐ and chalcogenide‐containing NCs. Thus, the functionality of such NCs and optical elements on their basis can be extended to high‐intensity applications and nonlinear optics.

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“…SPR results from the interaction of electromagnetic radiation with the plasma on the metal surface, leading to the great third-order nonlinear optical property of metal nanoparticles. [68][69][70][71] Saturable absorption effect can be enhanced at the wavelengths that SPR band covers, which derives from the saturation of coherent oscillation of electrons in conduction band. [72] In general, the wavelength of the absorption band is related to the shape and size of nanoparticles and the surrounding environment.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances and Challenges in Ultrafast Photonics Enabled by Metal Nanomaterials

Wang

Liu

Chao

et al. 2022

Advanced Optical Materials

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absorbers (SAs) are widely used to obtain ultrafast lasers. Mode-locking indicates a fixed phase between longitudinal modes in spectral domain, while Q-switching refers to the giant pulse formation due to the tunable Q factor of the laser cavity. Saturable absorption represents the optical modulation that absorption coefficient of SAs decreases with the increase of incident optical intensity, where SAs are often categorized into artificial and real SAs. [7][8][9] Artificial SAs mainly consist of nonlinear polarization evolution, [10,11] nonlinear optical loop mirrors, [12][13][14] and nonlinear amplification loop mirrors, [15,16] which fulfill the function of saturable absorption by means of nonlinear effects. By contrast, real SAs are characterized by the inherent nonlinear absorption property of the materials. Semiconductor saturable absorber mirror is a typical real SA and widely used in diverse lasers. However, several drawbacks such as complex fabrication and narrow operating bandwidth restrict its applications. [17][18][19][20][21] Under such circumstances, nanomaterials emerge as SAs of distinction where 2D nanomaterials have been widely investigated because of the unique optical properties induced by the energy band structures. [22][23][24][25][26][27][28] Graphene possesses zero bandgap and ultrafast carrier dynamics properties, contributing to a broad operating bandwidth and fast response time. [29][30][31][32][33][34][35][36] Nevertheless, the modulation depth of ≈2.3% per layer limits Nanomaterials with outstanding optical properties are widely used in ultrafast photonics. Especially, metal nanomaterials have attracted increasing attention in recent years owing to the surface plasmon resonance that further enhances their nonlinear optical response, making them suitable for generating ultrafast pulses in a wide range of wavebands. Herein, the fabrication and integration processes of typical metal nanomaterials such as gold, silver, and copper, as well as their applications in ultrafast lasers are reviewed. The synthesis methods of metal nanomaterials, which can be divided into dry and wet methods, are first introduced with their characteristics and advantages summarized. Moreover, the integration approaches that are used to incorporate metal nanomaterials into laser cavities are discussed, where sandwich structure based on polymer film and deposition method, as well as evanescent-wave structure based on D-shaped and tapered fiber are demonstrated. Besides, the state of the art of typical ultrafast lasers enabled by metal nanoparticles is systematically reviewed. Finally, current challenges and perspectives on the development of ultrafast photonics enabled by metal nanomaterials are proposed.

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Surface Plasmon Resonance Dependent Third-Order Optical Nonlinearities of Silver Nanoplates

Cited by 10 publications

References 26 publications

Alternative mitigating solutions based on inorganic nanoparticles for the preservation of cultural heritage

Alternative mitigating solutions based on inorganic nanoparticles for the preservation of cultural heritage

Laser Light Durability and Nonlinear Optical Properties of Acrylate Polymer−Chalcogenide Glass−Gold Nanocomposites

Recent Advances and Challenges in Ultrafast Photonics Enabled by Metal Nanomaterials

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