Nonlinear optical effects in nitrogen-doped graphene

Zhang, Fang; Wang, Zhengping; Wang, Duanliang; Wu, Zhixin; Wang, Shenglai; Xu, Xin­guang

doi:10.1039/c5ra19566g

Cited by 29 publications

(13 citation statements)

References 32 publications

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“…The Z-scan scheme with an open aperture (OA) was used for the investigation of the nonlinear absorption process in the samples. The fitting of the obtained data was performed according to the equations [ 34 , 35 ]:

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Section: Nonlinear Optical Properties Of Nanocomposites Cdc8+ag/au Npsmentioning

confidence: 99%

Probing Optical Nonlinearities of Unconventional Glass Nanocomposites Made of Ionic Liquid Crystals and Bimetallic Nanoparticles

et al. 2022

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In this paper, we report the synthesis and characterization of unconventional nanocomposites made of bimetallic nanoparticles dispersed in a liquid crystal glass. Core-shell bimetallic nanoparticles (Ag/Au or Au/Ag) and Ag-Au bimetallic nanoalloys are synthesized using cadmium alkanoate glass-forming liquid crystals as nanoreactors. Optical spectra of the produced glassy nanocomposites exhibit a distinctive absorption peak due to a surface plasmon resonance. In addition, these unusual materials demonstrate a strong nonlinear–optical response probed by means of the Z-scan technique. The use of near-infrared (1064 nm) and visible (532 nm) nanosecond laser pulses reveal a variety of nonlinear–optical mechanisms that depend on the composition of the studied nanocomposites. Our results indicate that metal alkanoate-based glass-forming ionic liquid crystals with embedded plasmonic nanoparticles are promising, yet they are overlooked photonic nanomaterials suitable for optical and nonlinear-optical applications.

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Section: Nonlinear Optical Properties Of Nanocomposites Cdc8+ag/au Npsmentioning

confidence: 99%

Probing Optical Nonlinearities of Unconventional Glass Nanocomposites Made of Ionic Liquid Crystals and Bimetallic Nanoparticles

et al. 2022

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“…We summarize the NLA parameters of the CrOCl crystal and other typical 2D SA materials (graphene, BP QDs, MoS 2 , N‐G, g‐C 3 N 4 , and β‐Sb) that used similar experimental conditions (a nanosecond laser and a picosecond laser) in Table . For nanosecond laser excitation, compared to graphene, BP QDs, and MoS 2 , the CrOCl crystal exhibits a larger nonlinear absorption coefficient β for a comparable saturation intensity I s at 1.06 µm.…”

Section: Nla Parameters Of Crocl and Other Typical 2d Sa Materialsmentioning

confidence: 99%

Broadband CrOCl Saturable Absorber with a Spectral Region Extension to 10.6 µm

Wang

Zhang

Wang

et al. 2019

Advanced Optical Materials

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Many studies have focused on NLO materials that are used in highpower pulsed lasers in the ultraviolet, visible, and near-infrared (IR) spectral ranges. Constrained by the currently available mid-IR NLO materials, mid-IR pulsed lasers with a wavelength range from 2.5 to 20 µm are underdeveloped. [5,6] NLO materials with saturable absorption properties are often used as the SAs of passively Q-switched lasers and modelocked lasers. Saturable absorption is one kind of NLO effect induced by the imaginary part of the complex third-order susceptibility. The saturable absorber (SA), which is the key component of a pulsed laser, is used to generate a high-energy pulse according to the material's saturable absorption characteristics. Traditional SAs are mainly divided into two categories: ion-doped crystals, such as chromium (Cr)-doped yttrium aluminum garnet (Cr:YAG) crystals or ceramics, and semiconductor saturable absorber mirrors. However, traditional SAs have the disadvantages of a complex preparation process, wavelength sensitivity, and a narrow modulation bandwidth. [7][8][9][10] In recent years, many new SAs were reported and demonstrated, including polarizer [11] and various 2D materials. [12,13] Benefiting from an adjustable bandgap, broadband transmittance, large nonlinearity, high carrier density and mobility, 2D SAs such as graphene, [14,15] black phosphorus, [16,17] topological insulators, [18,19] and transition metal dichalcogenides [20] have attracted attention in materials and optics research. However, the low laser damaged threshold (LDT) and uneven quality of 2D SAs greatly limit their application in the field of high-power solidstate lasers. In addition, the lack of scalable, reliable synthesis methods for 2D materials is a significant impediment that needs to be addressed. Hence, it is necessary and urgent to study new ultra-wideband NLO materials with excellent performance, especially over the wide range of IR bands. Ideal IR NLO materials should possess a wide range of transmission bands, strong NLO effects, and a high LDT. [21,22] Cr-ion-doped crystals play important roles in laser modulation. The valence states of Cr ions mainly include Cr 2+ , Cr 3+ , Cr 4+ , and Cr 5+ . The most common Cr 4+ -ion-doped crystals are typical SA materials for producing pulsed lasers near 1 µm in passively Q-switched and mode-locked lasers. For example, a dual-wavelength pulsed laser was achieved at 1.06 and 1.33 µm with a Nd:GdVO 4 laser using a Cr 4+ :YAG SA in 2016. [23] Crystals doped with Cr ions of other valences (Cr 2+ and Cr 5+ ) Nonlinear optical (NLO) materials with saturable absorption have attracted increasing attention because of their broad applications in the fields of optical communication, materials processing, biological detection, and surgery. However, their development is limited in the mid-infrared (IR) range due to a lack of available materials with a wideband NLO response. Herein, the optical properties and applications of the transition metal oxychloride CrOCl, which has a broadband transpare...

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“…Optical Kerr nonlinearity of ENZ organic molecular films was characterized in this study by femtosecond Z‐scan measurements . (See details in the Experimental Section and the Supporting Information for schematics of experimental setup.)…”

Section: Parameters Of the Lorentz Model For Tdbc:pva Filmsmentioning

confidence: 99%

Strong Nonlinear Optical Response in the Visible Spectral Range with Epsilon‐Near‐Zero Organic Thin Films

Lee

Garoni

Kita

et al. 2018

Advanced Optical Materials

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The optical properties of a medium are described by the dielectric permittivity ε and the refractive index N, where ε is a measure how much polarization is induced upon application of an optical electric field, while refractive index N determines how the optical phase develops as optical wave propagates in the optical medium by associating momentum k and energy ω. Optical epsilon-near-zero (ENZ) material possesses the permittivity |ε| → 0 and the phase velocity of optical wave becomes very large while the group velocity is slowing down significantly, owing to the relation between refractive index and permittivity, ε = N .[1] Related to nonlinear optical processes, this simple equation also implies that the optical Kerr nonlinearity is strongly enhanced in the ENZ spectral range. [2] Enhanced Kerr nonlinearities are observed in metamaterials such as conducting oxides and doped inorganic semiconductor thin films showing epsilon-nearzero (ENZ) response in the infrared region. However, to achieve ENZ in the visible, artificial metamaterials with more complex nanostructures have to be specifically designed. [2,4-bis[8-hydroxy-1,1,7,7-tetramethyljulolidin-9-yl] squaraine] organic thin films, ENZ responses between 450 and 620 nm are demonstrated. Both nonlinear refractive index and nonlinear absorption coefficient are enhanced by more than two orders of magnitude in the ENZ spectral region. These optical effects in the visible spectral range come from the strongly dispersive permittivity of molecular aggregates resulting from the coupling of excitonic transition dipoles. These findings open the path toward a next generation of high-performance solution-processable organic nonlinear optical materials with ENZ properties that can be tuned by molecular engineering. Here, using sodium [5,6-dichloro-2-[[5,6-dichloro-1-ethyl-3-(4-sulphobutyl)-benzimidazol-2-ylidene]-propenyl]-1-ethyl-3-(4-sulphobutyl)-benzimidazolium hydroxide] and

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Nonlinear optical effects in nitrogen-doped graphene

Abstract: The band structure of graphene can be adjusted by incorporating other elements or functional groups, correspondingly, the response to an external light field will also be changed.

Cited by 29 publications

References 32 publications

Probing Optical Nonlinearities of Unconventional Glass Nanocomposites Made of Ionic Liquid Crystals and Bimetallic Nanoparticles

Probing Optical Nonlinearities of Unconventional Glass Nanocomposites Made of Ionic Liquid Crystals and Bimetallic Nanoparticles

Broadband CrOCl Saturable Absorber with a Spectral Region Extension to 10.6 µm

Strong Nonlinear Optical Response in the Visible Spectral Range with Epsilon‐Near‐Zero Organic Thin Films

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