Probing Intermolecular Interactions in Binary Liquid Mixtures Using Femtosecond Laser-Induced Self-Defocusing

Maurya, Sandeep Kumar; Das, Dhiman; Goswami, Debabrata

doi:10.1177/0003702816643547

Cited by 5 publications

(3 citation statements)

References 47 publications

(56 reference statements)

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“…Peaks and valleys in reflection spectra display the reflectance and absorbance characteristics [34]. We defined a spectral index, known as peak valley ratio (PVR), using equation ( 13):…”

Section: Spectral Index Methodmentioning

confidence: 99%

Visual characterization of pollution and moisture parameters of the polluted HTV silicone rubber surface with hyperspectral imaging technology

Xia

Ren

Wang

et al. 2023

J. Phys. D: Appl. Phys.

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The application of high temperature vulcanized (HTV) silicone rubber materials in transmission lines insulators has been extensive. However, with the accumulation of pollution and moisture on the surface of HTV silicone rubber, the insulation reliability gradually decreases, which may even lead to flashover. In this paper, hyperspectral imaging technology (HSI) is utilized as a rapid and effective tool for the visual characterization of pollution and moisture parameters of the polluted HTV silicone rubber. Based on the analysis of reflection spectra, it has been determined that the pollution degree has a positive effect and the moisture content has a negative effect on the reflection characteristics of HTV silicone rubber, respectively. Further quantitative analysis of reflectance values at various moisture conditions reveals that exponential relationships can be observed between reflectance values and moisture contents at a certain wavelength. At the same time, linear correlations between reflectance values and pollution degrees (quantified as equivalent salt deposit density, ESDD) at a certain wavelength are also proposed. By integrating the exponential and linear relationships, a double-exponential model is formulated to concurrently characterize the ESDD and moisture content (MC). Furtherly, from the perspective of engineering application, to enhance the model’s robustness, a set of equations combining spectral indexes and spectral shape feature parameters is initially formulated for the calculating of ESDD and MC. Given the synchronous inversion and visualization capabilities of pollution and moisture parameters of the polluted HTV silicone rubber surface, the visual characterization model serves as a valuable tool for protecting against pollution flashover failures and designing power equipment insulation.

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“…Peaks and valleys in reflection spectra display the reflectance and absorbance characteristics [34]. We defined a spectral index, known as peak valley ratio (PVR), using equation ( 13):…”

Section: Spectral Index Methodmentioning

confidence: 99%

Visual characterization of pollution and moisture parameters of the polluted HTV silicone rubber surface with hyperspectral imaging technology

Xia

Ren

Wang

et al. 2023

J. Phys. D: Appl. Phys.

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“…Similarly, the differentiation of isomers and isotopes in fluids is also effectively possible with FTLS ( Bhattacharyya et al, 2014 ; Kumar et al, 2014 ). Additionally, FTLS is also sensitive to changes in intermolecular interactions, which would lead to phase separations ( Goswami et al, 2019 ), interfaces ( Singhal and Goswami, 2020 ), and several other physical interactions ( Maurya et al, 2016 ; Rawat et al, 2021 ). Cumulative thermal processes fall in the domain of weak perturbations that do not require strong absorption or any exact resonant excitation conditions.…”

Section: The Ftls: Transforming Vice To Virtuementioning

confidence: 99%

Intense femtosecond optical pulse shaping approaches to spatiotemporal control

Goswami

2023

Front. Chem.

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For studying any event, measurement can never be enough; “control” is required. This means mere passive tracking of the event is insufficient and being able to manipulate it is necessary. To maximize this capability to exert control and manipulate, both spatial and temporal domains need to be jointly accounted for, which has remained an intractable problem at microscopic scales. Simultaneous control of dynamics and position of an observable event requires a holistic combination of spatial and temporal control principles, which gives rise to the field of spatiotemporal control. For this, we present a novel femtosecond pulse-shaping approach. We explain how to achieve spatiotemporal control by spatially manipulating the system through trapping and subsequently or simultaneously exerting temporal control using shaped femtosecond pulses. By leveraging ultrafast femtosecond lasers, the prospect of having temporal control of molecular dynamics increases, and it becomes possible to circumvent the relaxation processes at microscopic timescales. Optical trapping is an exemplary demonstration of spatial control that results in the immobilization of microscopic objects with radiation pressure from a tightly focused laser beam. Conventional single-beam optical tweezers use continuous-wave (CW) lasers for achieving spatial control through photon fluxes, but these lack temporal control knobs. We use a femtosecond high repetition rate (HRR) pulsed laser to bypass this lack of dynamical control in the time domain for optical trapping studies. From a technological viewpoint, the high photon flux requirement of stable optical tweezers necessitates femtosecond pulse shaping at HRR, which has been a barrier until the recent Megahertz pulse shaping developments. Finally, recognizing the theoretical distinction between tweezers with femtosecond pulses and CW lasers is of paramount interest. Non-linear optical (NLO) interactions must be included prima facie to understand pulsed laser tweezers in areas where they excel, like the two-photon-fluorescence-based detection. We show that our theoretical model can holistically address the common drawback of all tweezers. We are able to mitigate the effects of laser-induced heating by balancing this with femtosecond laser-induced NLO effects. An interesting side-product of HRR femtosecond-laser-induced thermal lens is the development of femtosecond thermal lens spectroscopy (FTLS) and its ability to provide sensitive molecular detection.

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“…3) is analyzed. For instance, Maurya et al [214] used this method in the studies of the photothermal response of binary liquids. They found a correlation between the Z-scan signal and the strength of the hydrogen bonds and other type of interactions that occur between the binary components.…”

Section: Z-scan Thermal Mirror and Other Applicationsmentioning

confidence: 99%

Thermal lensing: outside of the lasing medium

Dobek

2022

Appl. Phys. B

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The thermal lens formed in a thermo-optical material as a result of its inhomogeneous heating, is a well-known phenomenon that has found widespread interest in the last decades, especially in the field of laser engineering and photo-thermal spectroscopy. In recent years, growing interest in the application of thermal lensing in different fields of optics and material studies has been observed. This review summarizes the latest efforts made by the scientific community to develop ways of using the phenomenon of thermal lensing. Its applications in spectroscopy, in laser beam formation and in imaging are described. The advantages and disadvantages of the thermal lensing in regard to these areas along with the potential future applications of the phenomenon are discussed.

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Probing Intermolecular Interactions in Binary Liquid Mixtures Using Femtosecond Laser-Induced Self-Defocusing

Cited by 5 publications

References 47 publications

Visual characterization of pollution and moisture parameters of the polluted HTV silicone rubber surface with hyperspectral imaging technology

Visual characterization of pollution and moisture parameters of the polluted HTV silicone rubber surface with hyperspectral imaging technology

Intense femtosecond optical pulse shaping approaches to spatiotemporal control

Thermal lensing: outside of the lasing medium

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