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Liu X, Yang J, Geng Z, Jia H. Simultaneous measurement of optical rotation dispersion and absorption spectra for chiral substances. Chirality 2020; 32:1072-1079. [PMID: 32329927 DOI: 10.1002/chir.23233] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 04/07/2020] [Accepted: 04/08/2020] [Indexed: 11/10/2022]
Abstract
We present a new method based on optical null methods for simultaneously measuring the optical rotatory dispersion (ORD) and absorption spectra of chiral substances. The optical rotation angle at a specific wavelength can be obtained from the optical nulls of the Malus curves with and without the sample. We use the optical nulls of the two curves as benchmark points and the readings to the right of the benchmark points by a certain angular offset to eliminate the influence of the analyzer on the light intensity and obtain the absorbance of the chiral substance at a specific wavelength. The 4096 pixels of the line scan CCD can measure multiple wavelengths simultaneously so that continuous ORD and absorption spectra can be obtained. The experimental results show that the standard deviation of the specific optical rotation is 0.11 deg mL g-1 dm-1 , the standard deviation of the maximum absorption wavelength is 0.45 nm, and that absorbance of the sample varies linearly with the concentration. This method is helpful for simplifying the experiment and has a profound influence on the analysis of the contents and molecular configurations of chiral substances in the future.
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Affiliation(s)
- Xing Liu
- School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Jinlong Yang
- School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Zhihao Geng
- School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Hongzhi Jia
- School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, China
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Stock C, Siefke T, Hubold M, Gassner C, Brüning R, Zeitner UD. Fully integrated stokes snapshot imaging polarimeter. EPJ WEB OF CONFERENCES 2020. [DOI: 10.1051/epjconf/202023806018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present a new concept for a fully integrated nano-optical snapshot imaging polarimeter. It consists of a nano-optical retarder and polarizer array with various orientations combined with a microlens array and crosstalk module. That facilitates a fast, robust, and compact stokes imaging polarimeter without moving parts for applications at 450 nm wavelength.
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Jiang S, Jia H, Lei Y, Shen X, Cao J, Wang N. Novel method for determination of optical rotatory dispersion spectrum by using line scan CCD. OPTICS EXPRESS 2017; 25:7445-7454. [PMID: 28380866 DOI: 10.1364/oe.25.007445] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A novel method is presented for rapid measurement of optical rotatory dispersion (ORD). Light passes through a polarizer, sample and analyzer, to a transmission grating that disperses the collimated light beam. A step-motor rotating stage controlled by a digital signal processor changes the analyzer orientation. The light power is measured by a charge-coupled device (CCD) after each rotating-stage step. The optical rotation angle for each wavelength is determined from the shift between two Malus curves obtained from each CCD pixel. The ORD spectrum is obtained by transforming the optical rotation angle into specific rotation. The ORD spectrum for a standard quartz tube demonstrates good continuity and agreement with reference data.
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Cao J, Jia H, Shen X, Jiang S. Research of optical rotation measurement system based on centroid algorithm. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:093108. [PMID: 27782570 DOI: 10.1063/1.4962701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
An optical rotation measurement system based on digital signal processor, modulated laser, and step motor rotating stage is established. Centroid algorithm featured fast and simple calculation is introduced to process light signals with or without sample to obtain the optical rotating angle through the step difference between two centroids. The system performance is proved experimentally with standard quartz tubes and glucose solutions. After various measurements, the relative error and precision of the system are determined to 0.4% and 0.004°, which demonstrates the reliable repeatability and high accuracy of whole measurement system.
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Affiliation(s)
- Junjie Cao
- Engineering Research Center of Optical Instruments and Systems, Ministry of Education, Shanghai Key Laboratory of Modern Optical Systems, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, China
| | - Hongzhi Jia
- Engineering Research Center of Optical Instruments and Systems, Ministry of Education, Shanghai Key Laboratory of Modern Optical Systems, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, China
| | - Xinrong Shen
- Engineering Research Center of Optical Instruments and Systems, Ministry of Education, Shanghai Key Laboratory of Modern Optical Systems, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, China
| | - Shixin Jiang
- Engineering Research Center of Optical Instruments and Systems, Ministry of Education, Shanghai Key Laboratory of Modern Optical Systems, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, China
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Yang Z, Jia H. Improving the accuracy of optical rotation measurement based on optical null methods by curve-fitting. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2013; 84:053104. [PMID: 23742529 DOI: 10.1063/1.4804596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
An optical rotation measuring system using optical null methods is set up. The system is based on a step-motor rotating stage structure and a modulated laser, which both are controlled by digital signal processor. By introducing a curve-fitting method, the optical rotation angle is obtained from the step difference between the crossed positions in light signal curves with or without sample. The principle of this method is studied, and the system performance is investigated experimentally. We achieved an accuracy of the order of 10(-3) degree in at least ±45° range, which is an improvement compared with the resolution of 0.01° for step-motor rotation stage.
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Affiliation(s)
- Zhenhao Yang
- Engineering Research Center of Optical Instrument and System, Ministry of Education, Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai 200093, China
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Ghassemi P, Lemaillet P, Germer TA, Shupp JW, Venna SS, Boisvert ME, Flanagan KE, Jordan MH, Ramella-Roman JC. Out-of-plane Stokes imaging polarimeter for early skin cancer diagnosis. JOURNAL OF BIOMEDICAL OPTICS 2012; 17:076014. [PMID: 22894497 PMCID: PMC10716523 DOI: 10.1117/1.jbo.17.7.076014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Revised: 06/01/2012] [Accepted: 06/06/2012] [Indexed: 05/09/2023]
Abstract
Optimal treatment of skin cancer before it metastasizes critically depends on early diagnosis and treatment. Imaging spectroscopy and polarized remittance have been utilized in the past for diagnostic purposes, but valuable information can be also obtained from the analysis of skin roughness. For this purpose, we have developed an out-of-plane hemispherical Stokes imaging polarimeter designed to monitor potential skin neoplasia based on a roughness assessment of the epidermis. The system was utilized to study the rough surface scattering for wax samples and human skin. The scattering by rough skin-simulating phantoms showed behavior that is reasonably described by a facet scattering model. Clinical tests were conducted on patients grouped as follows: benign nevi, melanocytic nevus, melanoma, and normal skin. Images were captured and analyzed, and polarization properties are presented in terms of the principal angle of the polarization ellipse and the degree of polarization. In the former case, there is separation between different groups of patients for some incidence azimuth angles. In the latter, separation between different skin samples for various incidence azimuth angles is observed.
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Affiliation(s)
- Pejhman Ghassemi
- Catholic University of America, Washington, District of Columbia 20064
- Washington Hospital Center, MedStar Health Research Institute, Washington, District of Columbia 20010
| | - Paul Lemaillet
- Catholic University of America, Washington, District of Columbia 20064
| | - Thomas A. Germer
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899
| | - Jeffrey W. Shupp
- Washington Hospital Center, MedStar Health Research Institute, Washington, District of Columbia 20010
| | - Suraj S. Venna
- Washington Hospital Center, MedStar Health Research Institute, Washington, District of Columbia 20010
| | - Marc E. Boisvert
- Washington Hospital Center, MedStar Health Research Institute, Washington, District of Columbia 20010
| | - Katherine E. Flanagan
- Washington Hospital Center, MedStar Health Research Institute, Washington, District of Columbia 20010
| | - Marion H. Jordan
- Washington Hospital Center, MedStar Health Research Institute, Washington, District of Columbia 20010
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Voit F, Hohmann A, Schäfer J, Kienle A. Multiple scattering of polarized light: comparison of Maxwell theory and radiative transfer theory. JOURNAL OF BIOMEDICAL OPTICS 2012; 17:045003. [PMID: 22559677 DOI: 10.1117/1.jbo.17.4.045003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
For many research areas in biomedical optics, information about scattering of polarized light in turbid media is of increasing importance. Scattering simulations within this field are mainly performed on the basis of radiative transfer theory. In this study a polarization sensitive Monte Carlo solution of radiative transfer theory is compared to exact Maxwell solutions for all elements of the scattering Müller matrix. Different scatterer volume concentrations are modeled as a multitude of monodisperse nonabsorbing spheres randomly positioned in a cubic simulation volume which is irradiated with monochromatic incident light. For all Müller matrix elements effects due to dependent scattering and multiple scattering are analysed. The results are in overall good agreement between the two methods with deviations related to dependent scattering being prominent for high volume concentrations and high scattering angles.
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Affiliation(s)
- Florian Voit
- Institut für Lasertechnologien in der Medizin und Meßtechnik, Helmholtzstr. 12, D-89081 Ulm, Germany
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