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Zhu H, Xu C, Wang DW, Yakovlev VV, Zhang D. Enhanced Chemical Sensing with Multiorder Coherent Raman Scattering Spectroscopic Dephasing. Anal Chem 2022; 94:8409-8415. [PMID: 35623094 DOI: 10.1021/acs.analchem.2c01060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Molecular vibrational spectroscopy is widely used in various sensing and imaging applications, providing intrinsic information at the molecular level. Nonlinear optical interactions using ultrashort laser pulses facilitate the selective coherent excitation of molecular vibrational modes by focusing energy into specific molecular bonds, boosting the signal level for multiple orders of magnitude. The dephasing of such coherence, which is susceptible to the local molecular environment, however, is often neglected. The unique capability of vibrational dephasing dynamics to serve as a unique probe for complex molecular interactions and the effect of local nano- and microenvironments are beyond the reach of conventional, intensity-based spectroscopy. Here, we developed a novel multiorder coherent Raman spectroscopy platform with a special focus on the temporal evolution of molecular vibrational dephasing, termed as time-resolved coherent Raman scattering (T-CRS) spectroscopy. By utilizing a high dynamic range detection, molecular vibrational dynamics and the environmental effects are demonstrated with multidimensional spectroscopic sensing, which promises a new range of applications in biology, materials, and chemical sciences.
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Affiliation(s)
- Hanlin Zhu
- Interdisciplinary Center for Quantum Information, Zhejiang Province Key Laboratory of Quantum Technology and Device, and Department of Physics, Zhejiang University, Hangzhou, Zhejiang 310028 China
| | - Chenran Xu
- Interdisciplinary Center for Quantum Information, Zhejiang Province Key Laboratory of Quantum Technology and Device, and Department of Physics, Zhejiang University, Hangzhou, Zhejiang 310028 China
| | - Da-Wei Wang
- Interdisciplinary Center for Quantum Information, Zhejiang Province Key Laboratory of Quantum Technology and Device, and Department of Physics, Zhejiang University, Hangzhou, Zhejiang 310028 China
| | - Vladislav V Yakovlev
- Department of Biomedical Engineering, Texas A&M University, College Station, Texas 77843 United States.,Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843 United States.,Department of Electrical and Computer Engineering, Texas A&M University, College Station, Texas 77843 United States
| | - Delong Zhang
- Interdisciplinary Center for Quantum Information, Zhejiang Province Key Laboratory of Quantum Technology and Device, and Department of Physics, Zhejiang University, Hangzhou, Zhejiang 310028 China
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Gorevoy A, Machikhin A, Martynov G, Pozhar V. Computational technique for field-of-view expansion in AOTF-based imagers. OPTICS LETTERS 2022; 47:585-588. [PMID: 35103682 DOI: 10.1364/ol.438374] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Accepted: 12/02/2021] [Indexed: 06/14/2023]
Abstract
A rather narrow field of view (FOV) has always been considered as an essential limitation of spectral imagers based on acousto-optical tunable filters (AOTFs). We demonstrate a computational technique to overcome this constraint. It is based on preliminary precise spectral-angular characterization of beam transformation caused by light diffraction on an acoustic wave and consequent correction of acquired stack of spectral images. This technique is applicable for any geometry of acousto-optic interaction and opens the way for the development of AOTFs with significantly expanded FOV.
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Mantsevich SN, Yushkov KB. Optimization of piezotransducer dimensions for quasicollinear paratellurite AOTF. ULTRASONICS 2021; 112:106335. [PMID: 33395592 DOI: 10.1016/j.ultras.2020.106335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 11/21/2020] [Accepted: 12/02/2020] [Indexed: 06/12/2023]
Abstract
The method of quasicollinear acousto-optic tunable filters (AOTFs) piezoelectric transducer dimensions optimization is presented. The AOTFs with large interaction length apply the bulk acoustic wave (BAW) reflection from the input optical facet. Optimization is based on spectral approach to simulation of the BAW field in anisotropic media and Raman-Nath equations numerically solved for the inhomogeneous acoustic field. It was found that variation of the transducer dimensions can minimize RF power consumption of the AOTF. Comparison of the optimized transducer dimensions with those commonly used in quasicollinear paratellurite AOTFs showed that it is possible to improve the AOTF energy efficiency in about 2 times. It was shown that acoustic field simulation results obtained for one AOTF geometry can be applied to the other geometries but for equivalent frequency providing the same ultrasound beam ray spectrum width. It was also shown that when choosing the quasicollinear AOTF with reflection geometry, one should not rely only on the AO figure of merit value, since the energy efficiency of such AOTF type will be determined by the product of the AO figure of merit and the AOTF efficiency, which takes into account the change in the acoustic beam width in the reflection process. The results aim at improving the design of AOTFs for ultrashort laser pulse shaping.
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Affiliation(s)
- Sergey N Mantsevich
- M.V. Lomonosov Moscow State University, 1 Leninskie Gory, Moscow 119991, Russia.
| | - Konstantin B Yushkov
- National University of Science and Technology MISIS, 4 Leninsky prospekt, Moscow 119049, Russia.
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Petrov GI, Arora R, Yakovlev VV. Coherent anti-Stokes Raman scattering imaging of microcalcifications associated with breast cancer. Analyst 2021; 146:1253-1259. [PMID: 33332488 PMCID: PMC8019521 DOI: 10.1039/d0an01962c] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Chemical imaging of calcifications was demonstrated in the depth of a tissue. Using long wavelength excitation, broadband coherent anti-Stokes Raman scattering and hierarchical cluster analysis, imaging and chemical analysis were performed 2 mm below the skin level in a model system. Applications to breast cancer diagnostics and imaging are discussed together with the methods to further extend the depth and improve the spatial resolution of chemical imaging.
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Affiliation(s)
- Georgi I Petrov
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843, USA.
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Jones RR, Hooper DC, Zhang L, Wolverson D, Valev VK. Raman Techniques: Fundamentals and Frontiers. NANOSCALE RESEARCH LETTERS 2019; 14:231. [PMID: 31300945 PMCID: PMC6626094 DOI: 10.1186/s11671-019-3039-2] [Citation(s) in RCA: 213] [Impact Index Per Article: 42.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 06/03/2019] [Indexed: 05/19/2023]
Abstract
Driven by applications in chemical sensing, biological imaging and material characterisation, Raman spectroscopies are attracting growing interest from a variety of scientific disciplines. The Raman effect originates from the inelastic scattering of light, and it can directly probe vibration/rotational-vibration states in molecules and materials. Despite numerous advantages over infrared spectroscopy, spontaneous Raman scattering is very weak, and consequently, a variety of enhanced Raman spectroscopic techniques have emerged. These techniques include stimulated Raman scattering and coherent anti-Stokes Raman scattering, as well as surface- and tip-enhanced Raman scattering spectroscopies. The present review provides the reader with an understanding of the fundamental physics that govern the Raman effect and its advantages, limitations and applications. The review also highlights the key experimental considerations for implementing the main experimental Raman spectroscopic techniques. The relevant data analysis methods and some of the most recent advances related to the Raman effect are finally presented. This review constitutes a practical introduction to the science of Raman spectroscopy; it also highlights recent and promising directions of future research developments.
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Affiliation(s)
- Robin R. Jones
- Turbomachinery Research Centre, University of Bath, Bath, BA2 7AY UK
| | - David C. Hooper
- Centre for Photonics and Photonic Materials, University of Bath, Bath, BA2 7AY UK
- Centre for Nanoscience and Nanotechnology, University of Bath, Bath, BA2 7AY UK
| | - Liwu Zhang
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433 China
| | - Daniel Wolverson
- Centre for Photonics and Photonic Materials, University of Bath, Bath, BA2 7AY UK
- Centre for Nanoscience and Nanotechnology, University of Bath, Bath, BA2 7AY UK
| | - Ventsislav K. Valev
- Centre for Photonics and Photonic Materials, University of Bath, Bath, BA2 7AY UK
- Centre for Nanoscience and Nanotechnology, University of Bath, Bath, BA2 7AY UK
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Troyanova-Wood M, Gobbell C, Meng Z, Gashev AA, Yakovlev VV. Optical assessment of changes in mechanical and chemical properties of adipose tissue in diet-induced obese rats. JOURNAL OF BIOPHOTONICS 2017; 10:1694-1702. [PMID: 28464472 PMCID: PMC5668206 DOI: 10.1002/jbio.201600281] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 01/22/2017] [Accepted: 02/24/2017] [Indexed: 05/15/2023]
Abstract
Obesity is becoming a leading cause of health problems world-wide. Obesity and overweight are associated with the structural and chemical changes in tissues; however, few methods exist that allow for concurrent measurement of these changes. Using Brillouin and Raman microspectroscopy, both the mechanical and chemical differences can be assessed simultaneously. We hypothesized that Brillouin spectroscopy can measure the adipose tissues' stiffness, which increases in obesity. Samples of brown and white adipose tissues obtained from control and diet-induced obese adult rats were analyzed. The results show that both adipose tissues of the obese group exhibit a greater high-frequency longitudinal elastic modulus than the control samples, and that the brown fat is generally stiffer than white adipose. The Raman spectra indicate that the lipids' accumulation in adipose tissue outpaces the fibrosis, and that the high-fat diet has a greater effect on the brown adipose than the white fat. Overall, the powerful combination of Brillouin and Raman microspectroscopies successfully assessed both the mechanical properties and chemical composition of adipose tissue simultaneously for the first time. The results indicate that the adipose tissue experiences an obesity-induced increase in stiffness and lipid content, with the brown adipose tissue undergoing a more pronounced change compared to white adipose.
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Affiliation(s)
- Maria Troyanova-Wood
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, 77843-3120, USA
| | - Cassidy Gobbell
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, 77843-3120, USA
| | - Zhaokai Meng
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, 77843-3120, USA
| | - Anatoliy A. Gashev
- Department of Medical Physiology, College of Medicine, Texas A&M University Health Science Center, Temple, TX, 76504, USA
| | - Vladislav V. Yakovlev
- Department of Biomedical Engineering, Texas A&M University, College Station, TX, 77843-3120, USA
- Corresponding Author:
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