Emerging applications of stimulated Raman scattering microscopy in materials science

Cheng, Qian; Miao, Yupeng; Wild, Joseph; Min, Wei; Yang, Yuan

doi:10.1016/j.matt.2021.02.013

Cited by 29 publications

(15 citation statements)

References 94 publications

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“…In n-type InSb crystal, electrons may be treated as the plasma carriers. The other material parameters of the representative sample are given in Table 1 [6,7]. Momentum transfer collision frequency, 𝜈 0 (s −1 ) 3.5×10 11 Optical phonon mode frequency, 𝜔 𝑜𝑝 (s −1 ) 3.7×10 13 Laser (pump) wave frequency, 𝜔 0 (s −1 ) 1.78×10 14 Eqs.…”

Section: Resultsmentioning

confidence: 99%

“…The scattering of laser beam from these modes lead to important nonlinear optical processes. Among the various nonlinear optical processes, the study of stimulated Raman scattering (SRS) is continuing a broad field of research owing to its important applications in modern optics [4][5][6]. SRS is caused by scattering of a laser beam by optical phonon mode in a nonlinear medium.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Carrier Heating on Raman Susceptibility of Weakly-Polar Semiconductor Magneto-Plasmas

Gopal¹,

Sharma

Singh

2022

Trends Sci

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In this paper, we develop a mathematical model to study the effects of carrier heating induced by a laser beam on Raman susceptibility of weakly-polar semiconductor magneto-plasmas. Using coupled mode approach, we obtain expressions for the real and imaginary parts of Raman susceptibility (Re⁡( χ_R),Im⁡( χ_R)) under hydrodynamic and rotating-wave approximations. In order to validate the results, we perform numerical analysis for n-InSb crystal - CO2 laser system. We observed change of sign of Re⁡( χ_R) as well as Im⁡( χ_R) around resonances. The carrier heating induced by the intense laser beam modifies the momentum transfer collision frequency of plasma carriers and consequently the Raman susceptibility of the semiconductor magneto-plasma, which subsequently enhances Re⁡( χ_R) and Im⁡( χ_R), (ii) shifts the enhanced Re⁡( χ_R) and Im⁡( χ_R) towards smaller values of applied magnetic field, and (iii) broadens the applied magnetic field regime at which change of sign of Re⁡( χ_R) and Im⁡( χ_R) are observed. The analysis leads to better understanding of Raman nonlinearity of semiconductor plasma and suggests an idea of development of Raman nonlinearity based optoelectronic devices. HIGHLIGHTS Effects of carrier heating on the real and imaginary parts of Raman susceptibility of weakly-polar semiconductor magneto-plasmas are investigated We observed alteration of sign of real and imaginary parts of Raman susceptibility around resonances Carrier heating induced by the intense laser beam: Enhances real and imaginary parts of Raman susceptibility, Shifts the enhanced real and imaginary parts of Raman susceptibility towards smaller values of applied magnetic field, and Broadens the applied magnetic field regime at which sign alteration of real and imaginary parts of Raman susceptibility are observed. GRAPHICAL ABSTRACT

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Carrier Heating on Raman Susceptibility of Weakly-Polar Semiconductor Magneto-Plasmas

Gopal¹,

Sharma

Singh

2022

Trends Sci

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“…The substrates are expensive and can have compatibility issues with certain analytes. Besides this, the SERS technique is also not appropriate for carrying out volumetric imaging [105]. In this context, SRS microscopy has superiority over existing techniques.…”

Section: Stimulated Raman Scattering (Srs) Microscopymentioning

confidence: 99%

Single-Particle Analysis of Atmospheric Aerosols: Applications of Raman Spectroscopy

et al. 2022

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Atmospheric aerosols, produced as a consequence of different anthropogenic and natural processes, impart significant control over the global energy budget, climate, and human–environmental health. Their size varies across the nano–micrometer scale. Based on their origin, they may be classified into primary or secondary aerosols. Biomass burning, incomplete combustion of fossil fuels, volcanic eruptions, and traffic-related and wind-driven suspensions contribute to primary aerosol emissions. In contrast, gas-to-particle conversion within the atmosphere leads to secondary particle production. The study of atmospheric aerosols is vital to the field of atmospheric research. The dynamic nature (highly variable concentration composition and size with space and time) of aerosols makes them difficult to investigate. Today, aerosol research involves the application of various spectrometric and spectroscopic techniques. The single-particle analysis of aerosols is yet a challenge. In this review, the merits and demerits of various offline and online techniques used for aerosol research are discussed in a nutshell. Mass spectrometric techniques fail in distinguishing certain species. However, Raman spectroscopy’s emergence for the compositional analysis of aerosols resolves most of the present characterization challenges. This review focuses on Raman spectroscopy applications, the merits of this technique, and its immense scope for the measurement of various types of aerosols and their properties. Surface-enhanced Raman spectroscopy (SERS) has an advantage over conventional micro-Raman spectroscopy (MRS). The review depicts the dominance of SERS, specifically in the context of the measurement of ambient atmospheric aerosols. This review discusses two important components, namely laboratory simulation and ambient aerosol studies.

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“…However, because of the small scattering cross-section of spontaneous Raman, micro-Raman imaging usually takes hours to generate a high-resolution image in a sample-scanning manner, which has limited its capability in studying the phase transitions of ice. Stimulated Raman scattering (SRS) microscopy has been rapidly evolved as a unique chemical imaging modality with ∼10 5 enhancement of Raman signal intensity, while retaining the spectral resolution to realize molecular specific imaging with high speed. , Exploiting these advantages, SRS microscopy has demonstrated broad applications in many research branches, including label-free tissue histology, lipid metabolism, drug delivery, material sciences, analytical chemistry, environmental sciences, etc. − Although there have been previous studies of water with coherent Raman scattering (CRS) microscopy, − imaging ice at low temperatures was seldom reported. Moreover, CRS imaging of crystals with polarization-controlled excitation and polarization-sensitive detections have shown potentials to explore crystal structures and symmetries , …”

Section: Introductionmentioning

confidence: 99%

Imaging Low-Temperature Phases of Ice with Polarization-Resolved Hyperspectral Stimulated Raman Scattering Microscopy

Chen

Liu

2023

J. Phys. Chem. B

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Water freezes into various phases of ice under different cryogenic temperatures and pressure conditions, such as ice Ih and ice XI at normal pressure. Vibrational imaging with high spectral, spatial, and polarization resolutions could provide detailed information on ice, including the phases and crystal orientations at the microscopic level. Here, we report in situ stimulated Raman scattering (SRS) imaging of ice to analyze the vibrational spectral changes of the OH stretching modes associated with the phase transition between ice Ih and ice XI. In addition, polarization-resolved measurements were performed to reveal the microcrystal orientations of the two phases of ice, with the spatial-dependent anisotropy pattern indicating the inhomogeneous distribution of their orientations. Furthermore, the angular patterns were theoretically explained by third-order nonlinear optics with the known crystal symmetries of the ice phases. Our work may provide new opportunities to investigate many intriguing physical chemistry properties of ice under low-temperature conditions.

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Emerging applications of stimulated Raman scattering microscopy in materials science

Cited by 29 publications

References 94 publications

Effects of Carrier Heating on Raman Susceptibility of Weakly-Polar Semiconductor Magneto-Plasmas

Effects of Carrier Heating on Raman Susceptibility of Weakly-Polar Semiconductor Magneto-Plasmas

Single-Particle Analysis of Atmospheric Aerosols: Applications of Raman Spectroscopy

Imaging Low-Temperature Phases of Ice with Polarization-Resolved Hyperspectral Stimulated Raman Scattering Microscopy

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