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Sharma A, Gupta SK, Goswami D. Sensitivity Chronicles in Molecular Properties: Unraveling the Nexus of Dual-Beam Z-Scan and Time-Resolved Thermal Lens Spectroscopy. J Phys Chem A 2024; 128:8544-8550. [PMID: 39308265 DOI: 10.1021/acs.jpca.4c04030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2024]
Abstract
Ultrasensitive thermal lens (TL) spectroscopy, where the interplay between conduction and convection is crucial, provides profound insights into molecular behavior. This work focuses on the critical role of molecular convection by using the dual-beam z-scan method and time-resolved TL spectroscopy. We specifically investigated the correlation between the detection iris and the spot size of the pump beam. Additionally, we address detection limitations and their influence on the perception of convection timing. We introduce an experimentally derived ratio optimized for higher sensitivity, enhancing the reliability of TL spectroscopy. This refined approach to TL spectroscopy allows for a deeper exploration of molecular characteristics in liquids.
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Affiliation(s)
- Aman Sharma
- Centre for Lasers and Photonics, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Sumit Kumar Gupta
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Debabrata Goswami
- Centre for Lasers and Photonics, Indian Institute of Technology Kanpur, Kanpur 208016, India
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
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Investigation of Third-Order Optical Susceptibility in ZnO/SnO2/Ag Ternary Composite Nanoparticles. J Inorg Organomet Polym Mater 2021. [DOI: 10.1007/s10904-021-01993-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Ghosh S, Sakshi, Swain BC, Chakraborty R, Tripathy U, Chattopadhyay K. A Novel Tool to Investigate the Early and Late Stages of α-Synuclein Aggregation. ACS Chem Neurosci 2020; 11:1610-1619. [PMID: 32407096 DOI: 10.1021/acschemneuro.0c00068] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The accumulation of an inherently disordered protein α-synuclein (α-syn) aggregates in brain tissue play a pivotal role in the pathology and etiology of Parkinson's disease. Aggregation of α-syn has been found to be complex and heterogeneous, occurring through multitudes of early- and late-stage intermediates. Because of the inherent complexity and large dynamic range (between a few microseconds to several days under in vitro measurement conditions), it is difficult for the conventional biophysical and biochemical techniques to sample the entire time window of α-syn aggregation. Here, for the first time, we introduced the Z-scan technique as a novel tool to investigate different conformations formed in the early and late stage of temperature and mechanical stress-induced α-syn aggregation, in which different species showed its characteristic nonlinear characteristics. A power-dependent study was also performed to observe the changes in the protein nonlinearity. The perceived nonlinearity was accredited to the thermal-lensing effect. A switch in the sign of the refractive nonlinearity was observed for the first time as a signature of the late oligomeric conformation, a prime suspect that triggers cell death associated with neurodegeneration. We validate Z-scan results using a combination of different techniques, like thioflavin-T fluorescence assay, fluorescence correlation spectroscopy, Fourier-transform infrared spectroscopy, and atomic force microscopy. We believe that this simple, inexpensive, and sensitive method can have potential future applications in detecting/monitoring conformations in other essential peptides/proteins related to different neurodegenerative and other human diseases.
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Affiliation(s)
- Sumanta Ghosh
- Structural Biology and Bioinformatics Division, Indian Institute of Chemical Biology (CSIR-IICB), 4 Raja S. C. Mullick Road, Kolkata 700032, India
| | - Sakshi
- Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, Jharkhand, India
| | - Bikash Chandra Swain
- Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, Jharkhand, India
| | - Ritobrita Chakraborty
- Structural Biology and Bioinformatics Division, Indian Institute of Chemical Biology (CSIR-IICB), 4 Raja S. C. Mullick Road, Kolkata 700032, India
| | - Umakanta Tripathy
- Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, Jharkhand, India
| | - Krishnananda Chattopadhyay
- Structural Biology and Bioinformatics Division, Indian Institute of Chemical Biology (CSIR-IICB), 4 Raja S. C. Mullick Road, Kolkata 700032, India
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Santos RD, Melo PD, Nunes A, Meneghetti M, Lyra M, Oliveira ID. Electro-optical switching in twisted nematic samples doped with gold nanorods. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111704] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Muhammad S, Hussain S, Chen X, Al-Sehemi AG, Li ZJ, Lai CH, Iqbal J. A dual approach to study the synthesis, crystal structure and nonlinear optical properties of binuclear Pd(II) complex of 3-methyl-5-(trifluoromethyl) pyrazole and its potential quantum chemical analogues. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.05.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Singhal S, Goswami D. Thermal Lens Study of NIR Femtosecond Laser-Induced Convection in Alcohols. ACS OMEGA 2019; 4:1889-1896. [PMID: 31459443 PMCID: PMC6648880 DOI: 10.1021/acsomega.8b02956] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 01/14/2019] [Indexed: 06/10/2023]
Abstract
We use time-resolved thermal lens (TL) experiments to examine the convective heat transfer at microscale in the first eight members of the homologous series of primary alcohols. TL measurements enable a direct study of these primary alcohols without adding any chromophore as a function of varying heat loads created via femtosecond laser pulses at 1560 nm. Convective heat transfer leads to the asymmetrical and reduced thermal gradient, which substantially weakens the TL signal. The inflection in the time profile of the TL signal of methanol at higher powers is attributed to the greater molecular convection in methanol compared to other samples. This inflection dies out with a decrease in laser power. Our results demonstrate that the convection is more prominent at higher laser powers in all samples, and it modifies the trend in the steady-state TL signal of different alcohols with pump laser power. Methanol also has the highest steady-state TL among the primary alcohol series at low laser powers. The maxima in the TL signal are shifted systematically from methanol to ethanol and then to propanol as the laser power increases. Semiempirical analysis of time-resolved TL signal by using the latest theoretical TL model enabled us to extract the coefficient of convective heat transfer in methanol at different laser powers. In addition to that, analysis of other members of alcohol series at the highest (7.3 mW) laser power shows that convection is more facile in short-chain alcohols compared to the long-chain alcohols.
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Affiliation(s)
- Sumit Singhal
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, Uttar Pradesh, India
| | - Debabrata Goswami
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, Uttar Pradesh, India
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Tsalu PV, Kim GW, Hong JW, Ha JW. Homogeneous localized surface plasmon resonance inflection points for enhanced sensitivity and tracking plasmon damping in single gold bipyramids. NANOSCALE 2018; 10:12554-12563. [PMID: 29932189 DOI: 10.1039/c8nr03311k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The most polarizable localized surface plasmon resonance (LSPR) longitudinal mode of anisotropic metallic nanoparticles, such as gold bipyramids (AuBPs), is of high prominence. This optical response has tremendous applications from spectroscopy to photonics and energy devices to sensing. In conventional LSPR-based sensing, broadening and asymmetry in peaks due to chemical and instrument noise hinder obtaining a precise insight on shift positions, accordingly limiting the effectiveness and impact of LSPR sensors. Further, when investigating LSPR properties, utilizing more simplistic frequency dependent dielectric-type models can aberrantly impact the reliability of fundamental properties used for designing and fabricating efficient optical devices. For instance, more approximations can effectively limit screening intra-band and inter-band (IB) electronic transition contributions and other related optical properties. With an aim to find alternative methods to further improve their efficiency, as a first report, we devoted a particular focus on LSPR scattering inflection points (IFs) of single AuBPs. The findings reveal that tracking LSPR IFs exhibit high sensitivity over their counterpart LSPR peak shift locations. In addition, we newly detected IB transition contributions near the resonance energy in the range (1.50 eV-2.00 eV) dominated by intra-band transitions. A small increase in the local RI effectively enhances the LSPR quality factor due to IB transitions. Therefore, while neglecting IB transitions in the range below 2.4 eV can work for local air refractive index (RI), in high local RI media it can be aberrantly underestimated. Demonstrated by the use of the dielectric function based on Kramers-Kronig consistent Lorentz oscillators, our findings are in good agreement with the enhancing RI sensitivity effect. The results of this investigation support the idea that tracking curvature changes of an optical signal can be effectively used for LSPR longitudinal peak RI sensing as well as damping in the local RI environment of a single AuBP.
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Affiliation(s)
- Philippe Vuka Tsalu
- Department of Chemistry, University of Ulsan, 93 Daehak-ro, Nam-gu, Ulsan 44610, Republic of Korea.
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Silva RS, de Melo PB, Omena L, Nunes AM, da Silva MGA, Meneghetti MR, de Oliveira IN. Temperature dependence of the nonlinear optical response of smectic liquid crystals containing gold nanorods. Phys Rev E 2017; 96:062703. [PMID: 29347296 DOI: 10.1103/physreve.96.062703] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Indexed: 06/07/2023]
Abstract
The present study is devoted to the investigation of the nonlinear optical properties of a smectic liquid crystal doped with gold nanorods. Using the Z-scan technique, we investigate the changes in the optical birefringence of a homeotropic sample upon laser exposure, considering the configurations of normal and oblique incidence. Our results reveal that the birefringence variations may be governed by distinct physical mechanisms, depending on the relative angle between the far-field director and the wave vector of the excitation laser beam. In particular, we observe that the position dependence of the far-field transmittance exhibits different behaviors as the incidence angle is changed, indicating that distortions in the beam wavefront may be associated with the thermal lens phenomenon or an optically induced reorientation of the nematic director. The temperature dependence of the nonlinear refractive and absorptive coefficients is investigated close to the smectic-A-nematic phase transition. A detailed analysis of the interplay between smectic order and plasmon resonance is performed, thus unveiling the capability of plasmonic liquid crystal to be used in optical devices.
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Affiliation(s)
- R S Silva
- Instituto de Física, Universidade Federal de Alagoas, 57072-970 Maceió, Alagoas, Brazil
| | - P B de Melo
- Instituto de Física, Universidade Federal de Alagoas, 57072-970 Maceió, Alagoas, Brazil
| | - L Omena
- Instituto de Física, Universidade Federal de Alagoas, 57072-970 Maceió, Alagoas, Brazil
| | - A M Nunes
- Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, 57072-970 Maceió, Alagoas, Brazil
| | - M G A da Silva
- Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, 57072-970 Maceió, Alagoas, Brazil
| | - M R Meneghetti
- Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, 57072-970 Maceió, Alagoas, Brazil
| | - I N de Oliveira
- Instituto de Física, Universidade Federal de Alagoas, 57072-970 Maceió, Alagoas, Brazil
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Kurochkin O, Murugesan YK, Bennett TP, D'Alessandro G, Reznikov Y, Tang BJ, Mehl GH, Kaczmarek M. Thermal optical non-linearity of nematic mesophase enhanced by gold nanoparticles--an experimental and numerical investigation. Phys Chem Chem Phys 2016; 18:11503-12. [PMID: 27063912 DOI: 10.1039/c6cp00116e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work the mechanisms leading to the enhancement of optical nonlinearity of nematic liquid crystalline material through localized heating by doping the liquid crystals (LCs) with gold nanoparticles (GNPs) are investigated. We present some experimental and theoretical results on the effect of voltage and nanoparticle concentration on the nonlinear response of GNP-LC suspensions. The optical nonlinearity of these systems is characterized by diffraction measurements and the second order nonlinear refractive index, n2, is used to compare systems with different configurations and operating conditions. A theoretical model based on heat diffusion that takes into account the intensity and finite size of the incident beam, the nanoparticle concentration dependent absorbance of GNP doped LC systems and the presence of bounding substrates is developed and validated. We use the model to discuss the possibilities of further enhancing the optical nonlinearity.
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Affiliation(s)
- O Kurochkin
- Institute of Physics of National Academy of Sciences of Ukraine, Kyiv 03028, Ukraine
| | - Y K Murugesan
- School of Mathematics, University of Southampton, Southampton, SO17 1BJ, UK
| | - T P Bennett
- School of Mathematics, University of Southampton, Southampton, SO17 1BJ, UK
| | - G D'Alessandro
- School of Mathematics, University of Southampton, Southampton, SO17 1BJ, UK
| | - Y Reznikov
- Institute of Physics of National Academy of Sciences of Ukraine, Kyiv 03028, Ukraine
| | - B J Tang
- Department of Chemistry, University of Hull, Hull, HU6 7RX, UK
| | - G H Mehl
- Department of Chemistry, University of Hull, Hull, HU6 7RX, UK
| | - M Kaczmarek
- School of Physics, University of Southampton, Southampton, SO17 1BJ, UK.
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