Effect of isotope substitution in binary liquids with Thermal-Lens spectroscopy

Bhattacharyya, Indrajit; Kumar, Pardeep; Goswami, Debabrata

doi:10.1016/j.cplett.2014.02.056

Cited by 11 publications

(7 citation statements)

References 33 publications

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“…We present results obtained from the single beam Z-scan study of various binary liquid mixtures of methanol and find parallel correlation in the experimental results from previously obtained two color thermal lens pump-probe Z-scan techniques 49,50 for all the binary mixtures under study (MeOH-DMSO, MeOH-CCl 4 , MeOH-DCM). Although, there is a consistent correlation between the behavior of these binary mixtures using Z-scan and thermal lens technique, there are also certain differences as the methanol proportion increases with respect to their binary constituent for Z-scan as compared to thermal lens pump-probe measurement.…”

Section: Thermo-optical Properties Correlation To Cazs Of the Binary Liquid Mixturesupporting

confidence: 69%

“…Although, there is a consistent correlation between the behavior of these binary mixtures using Z-scan and thermal lens technique, there are also certain differences as the methanol proportion increases with respect to their binary constituent for Z-scan as compared to thermal lens pump-probe measurement. Note that in the thermal lens pump-probe Z-scan experiments, 49,50 the pump beam is centered around 1560 nm. Methanol has a resonant single photon absorption due to vibrational combination band 49,51,52 at 1560 nm.…”

Section: Thermo-optical Properties Correlation To Cazs Of the Binary Liquid Mixturementioning

confidence: 99%

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

2016

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Photo-thermal behavior of binary liquid mixtures has been studied by high repetition rate (HRR) Z-scan technique with femtosecond laser pulses. Changes in the peak-valley difference in transmittance (ΔT) for closed aperture Z-scan experiments are indicative of thermal effects induced by HRR femtosecond laser pulses. We show such indicative results can have a far-reaching impact on molecular properties and intermolecular interactions in binary liquid mixtures. Spectroscopic parameters derived from this experimental technique show that the combined effect of physical and molecular properties of the constituent binary liquids can be related to the components of the binary liquid.

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Section: Thermo-optical Properties Correlation To Cazs Of the Binary Liquid Mixturesupporting

confidence: 69%

Section: Thermo-optical Properties Correlation To Cazs Of the Binary Liquid Mixturementioning

confidence: 99%

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

2016

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“…Thus, FTLS can distinguish between molecules within fluids based on both size and shape ( Kumar et al, 2014 ; Kumar et al, 2014 ). 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 ).…”

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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“…using forces of coherent radiation pressure at benign infrared (IR) wavelength of 1064 nm [1][2][3] have increased the range of precise biomanipulation appliances. While the same advantages remain for benign wavelength operation at 780 nm as trapping laser, this is not true for IR laser trapping at 1560 nm, which has an increased water absorption [4,5]. The strong vibrational combination band of hydroxyl group (OH) at 1560 nm [6] along with the non-radiative relaxation of water leads to a substantial temperature rise.…”

Section: Introductionmentioning

confidence: 99%

Controlling local temperature in water using femtosecond optical tweezer

Mondal

Goswami

2015

Biomed. Opt. Express

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A novel method of directly observing the effect of temperature rise in water at the vicinity of optical trap center is presented. Our approach relies on changed values of corner frequency of the optical trap that, in turn, is realized from its power spectra. Our two color experiment is a unique combination of a non-heating femtosecond trapping laser at 780 nm, coupled to a femtosecond infrared heating laser at 1560 nm, which precisely controls temperature at focal volume of the trap center using low powers (100-800 µW) at high repetition rate. The geometric ray optics model quantitatively supports our experimental data.

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Effect of isotope substitution in binary liquids with Thermal-Lens spectroscopy

Cited by 11 publications

References 33 publications

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

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

Intense femtosecond optical pulse shaping approaches to spatiotemporal control

Controlling local temperature in water using femtosecond optical tweezer

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