Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 9
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

A dual-wavelength optical polarimetric approach has been proposed as a means of elimination of the systematic errors and estimation of the optical anisotropy parameters for a single DKDP crystal. Our HAUP-related polarimeter uses two semiconductor lasers with the neighbouring wavelengths of 635 nm and 650 nm. Based on the temperature dependence analysis of small characteristic azimuths of light polarization with respect to the axis of the sample, we found the parameters of imperfections of polarization system. We acquired eigen waves ellipticities in a DKDP crystal and found perpendicular to the optic axis value of the optical rotatory power. Our results correlate positively with previously measured data for KDP crystals.

Go to article

Authors and Affiliations

Y. Shopa
M. Shopa
N. Ftomyn
Download PDF Download RIS Download Bibtex

Abstract

A novel magneto-optical current sensor (MOCS) with two sensing arms is proposed to improve the temperature stability. One of the arms, with a highly stable permanent magnet attached and orthogonal to the other one, is designed to provide a reference that follows the temperature characteristics of the sensing material. By a normalization operation between two arms, the temperature drift is compensated adaptively and a sensing output proportional to the measured current can be reached. A dual-input and dual-output structure is specially designed for the reference sensing arm to demodulate the DC Faraday rotation angle. This scheme compensates simultaneously two main temperature influence factors, the Verdet constant and linear birefringence. Validation tests were carried out and are discussed.

Go to article

Authors and Affiliations

Jinling Chen
Hongbin Li
Mingming Zhang
Yan Zhang
Download PDF Download RIS Download Bibtex

Abstract

An imaging polarimeter based on the principles of high-accuracy polarimetry well known in crystal optics is proposed. The application of scientific digital cameras for performance light measurements leads to precise data on polarizers quality, i.e., maps of extinction ratio and transmission axis. Processing of numerous images, acquired at various settings in the polarizer-sample-analyser system, allows to determine the two-dimensional distribution of the phase retardation of birefringent plates. Several results of imaging polarimetry experiments on birefringent plates demonstrate the impact of multiple light reflections on the measured phase retardation values. Experimental data for LiNbO 3 and SiO 2 crystal plates have been presented, demonstrating the capabilities of the proposed type of imaging polarimeter in the crystal optics studies. This technique also allows the measurement of the eigen wave ellipticities, associated with the optical activity of crystals.
Go to article

Bibliography

  1. Tyo, J. , Goldstein, D. L., Chenault, D. B. & Shaw, J. A. Review of passive imaging polarimetry for remote sensing applications. Appl. Opt. 45, 5453–5469 (2006). https://doi.org/10.1364/AO.45.005453
  2. Chipman, R. , Lam, W.-S. T. & Young, G. Polarized Light and Optical Systems (Boca Raton, CRC Press. 2018) https://doi.org/10.1201/9781351129121
  3. Azzam, R. A. Stokes-vector and Mueller-matrix polarimetry [Invited]. J. Opt. Soc. Am. A. 33, 1396–1408 (2016). http://doi.org/10.1364/JOSAA.33.001396
  4. Goldstein, D. Polarized light (3rd ed.) Ch. 5–6 (Boca Raton, CRC press, 2017). https://doi.org/10.1201/b10436
  5. Pezzaniti, J. & Chipman, R. A. Mueller matrix imaging polarimetry. Opt. Eng. 34, 1558–1568 (1995). https://doi.org/10.1117/12.206161
  6. Shribak, M. & Oldenburg, R. Techniques for fast and sensitive measurements of two-dimensional birefringence distributions. Opt. 42, 3009–3017 (2003). https://doi.org/10.1364/AO.42.003009
  7. Shribak, M. Polychromatic polarization microscope: bringing colors to a colorless world. Rep. 5, 17340 (2015). https://doi.org/10.1038/srep17340
  8. Geday, M. , Kaminsky, W., Lewis, J. G. & Glazer, A. M. Images of absolute retardance L·Δn, using the rotating polariser method. J. Microsc. 198, 1–9 (2000). https://doi.org/10.1046/j.1365-2818.2000.00687.x
  9. Oka, K. & Kaneko, T. Compact complete imaging polarimeter using birefringent wedge prisms. Express 11, 1510–1519 (2003). https://doi.org/10.1364/OE.11.001510
  10. Rubin, N. et al. Matrix Fourier optics enables a compact full-Stokes polarization camera. Science 365, 43–52 (2019). https://doi.org/10.1126/science.aax1839
  11. Gottlieb, D. & Arteaga, O. Mueller matrix imaging with a polarization camera: application to microscopy. Express. 29, 34723–34734 (2021). https://doi.org/10.1364/OE.439529
  12. Sasagawa, K. et al. Image sensor pixel with on-chip high extinction ratio polarizer based on 65-nm standard CMOS technology. Express. 21, 11132–11140 (2013). https://doi.org/10.1364/OE.21.011132
  13. Hagen, N. , Shibata, S. & Otani, Y. Calibration and performance assessment of microgrid polarization cameras. Opt. Eng. 58, 082408 (2019). https://doi.org/10.1117/1.OE.58.8.082408
  14. Kaminsky, W., Claborn, K. & Kahr, B. Polarimetric imaging of crystals. Chem. Rev. 33, 514–525 (2004). http://doi.org/10.1039/b201314m
  15. Takanabe, A., Koshima, H. & Asahi, T. Fast-type high-accuracy universal polarimeter using charge-coupled device spectrometer. AIP Adv. 7, 025209 (2017). https://doi.org/10.1063/1.4977440
  16. Op Amp Applications Handbook (ed. Yung, W. G.) (Analog Devices, 2002). http://www.miedema.dyndns.org/co/2018/Op_Amp_Applications_Handbook-Walt-Jung_2005.pdf
  17. Kobayashi, J. & Uesu, Y. A new optical method and apparatus HAUP for measuring simultaneously optical activity and birefringence of crystals. I. Principles and construction. Appl. Crystallogr. 16, 204–211 (1983). https://doi.org/10.1107/S0021889883010262
  18. Hernández-Rodríguez, C., Gomez-Garrido, P. & Veintemillas, S. Systematic errors in the high-accuracy universal polarimeter: application to the determining temperature-dependent optical anisotropy of KDC and KDP crystals. Appl. Crystallogr. 33, 938–946 (2000). http://doi.org/10.1107/S0021889800003605
  19. Stangner, T., Zhang, H., Dahlberg, T., Wiklund, K. & Andersson, M. Step-by-step guide to reduce spatial coherence of laser light using a rotating ground glass diffuser. Opt. 56, 5427–5435 (2017). https://doi.org/10.1364/AO.56.005427
  20. Bennett, J. Polarization. in Handbook of Optics (eds. Bass, M., Van Stryland, E .W., Wolfe, W. L. & Williams, D.R.) vol. 1, Ch 5 (McGraw-Hill, 1995).
  21. Bennett, J. Polarizers. in Handbook of Optics (eds. Bass, M., Van Stryland, E. W., Wolfe, W. L. & Williams, D. R.) vol. 2, Ch. 3 (McGraw-Hill, 1995).
  22. Zhou, K., Simpson, G., Chen, X., Zhang, L. & Bennion, I. High extinction ratio in-fiber polarizers based on 45° tilted fiber Bragg gratings. Lett. 30, 1285–1287 (2005). https://doi.org/10.1364/OL.30.001285
  23. Ratajczyk, F. Generalized Malus law. Appl. 9, 281–283 (1979). https://opticaapplicata.pwr.edu.pl/files/pdf/1979/no4/optappl_904p281.pdf
  24. Takubo, Y., Takeda, N., Huang, J. , Muroo, K. & Yamamoto, M. Precise measurement of the extinction ratio of a polarization analyser Meas. Sci. Technol. 9, 20–23 (1998). https://doi.org/10.1088/0957-0233/9/1/004
  25. Mei, H.-H., Chen, Sh.-J. & Ni, W.-T. Suspension of the fiber mode-cleaner launcher and measurement of the high extinction-ratio (10−9) ellipsometer for the Q & A experiment. Phys. Conf. Ser. 32, 236–243 (2006). https://doi.org/10.1088/1742-6596/32/1/035
  26. Shopa, Y., Shopa, M. & Ftomyn, N. Dual-wavelength laser polarimeter and its performance capabilities. Opto-Electron. Rev. 25, 6–9 (2017). http://doi.org/10.1016/j.opelre.2017.01.001
  27. Yariv, A. & Yeh, P. Optical Waves in Crystals: Propagation and Control of Laser Radiation. (Wiley, 2002).
  28. Shopa, M., Ftomyn, N. & Shopa, Y. Dual-wavelength polarimeter application in investigations of the optical activity of a langasite crystal. Opt. Soc. Am. A 34, 943–948 (2017). https://doi.org/10.1364/JOSAA.34.000943
  29. Shopa, M. & Ftomyn, N. Application of two-dimensional intensity maps in high-accuracy polarimetry. Opt. Soc. Am. A 36, 485–491 (2019). https://doi.org/10.1364/josaa.36.000485
  30. Hernández-Rodríguez, C. & Gomez-Garrido, P. Optical anisotropy of quartz in the presence of temperature-dependent multiple reflections using a high-accuracy universal polarimeter. Phys. D 33, 2985–2994 (2000). https://doi.org/10.1088/0022-3727/33/22/318
  31. Konstantinova, A. , Evdishchenko, E. A. & Imangazieva, K. B. Manifestation of optical activity in crystals of different symmetry classes. Crystallogr. Rep. 51, 998–1008 (2006). https://doi.org/10.1134/S1063774506060113
  32. Crystal polarizers, Thorlabs, Inc. https://www.thorlabs.com/navigation.cfm?guide_id=2458 (2022).
  33. Shribak, M., Otani, Y. & Yoshizawa, T. Return-path polarimeter for two-dimensional birefringence distribution measurement. SPIE. 3754, 144–149 (1999). https://doi.org/10.1117/12.366325
  34. Noguchi, M., Ishikawa, T., Ohno, M. & Tachihara, S. Measurement of 2D birefringence distribution. SPIE. 1720, 367–378 (1992). https://doi.org/10.1117/12.132143
  35. Otani, Y., Shimada, T., Yoshizawa, T. & Umeda, N. Two-dimensional birefringence measurement using the phase shifting technique. Eng. 33, 1604–1609 (1994). https://doi.org/10.1117/12.168435
Go to article

Authors and Affiliations

Mykola Shopa
1
ORCID: ORCID
Serhiy Kobyakov
2
ORCID: ORCID
Yaroslav Shopa
2
ORCID: ORCID

  1. Institute of Physics and Applied Computer Science, Gdańsk University of Technology, 11/12 Gabriela Narutowicza St., 80-233 Gdańsk, Poland
  2. Faculty of Mathematics and Natural Sciences, Cardinal Stefan Wyszyński University in Warsaw, 5 Dewajtis St., 01-815 Warsaw, Poland
Download PDF Download RIS Download Bibtex

Abstract

In the present work TiO2 nanoparticles (NPs) have been dispersed into three different nematic liquid crystals (2020, 1823A and 1550C) in different concentration. The value of the birefringence (Δn) has been calculated by the transmitted intensity method at a 632.8 nm wavelength. NLC 2020 used in the present study is a high birefringent material (Δn = 0.44), NLC 1550C is a low birefringent material (Δn = 0.067) and NLC 1823A is a mid birefringent material (Δn = 0.14). An increased value of birefringence has been found after dispersion of TiO2 NPs in all three NLCs but this increment depends upon the concentration of the dopant material, temperature range and chemical character of the mixtures. It is suggested that this LC materials can be applicable in making of phase shifters, compensators and many more photonic devices.

Go to article

Authors and Affiliations

G. Pathak
R. Katiyar
K. Agrahari
A. Srivastava
R. Dabrowski
K. Garbat
R. Manohar
Download PDF Download RIS Download Bibtex

Abstract

In the present investigation optical, electro-optical and dielectric properties have been measured for nematic liquid crystal (NLC) material 1550C which consists of 4’-(trans, trans-4-alkylbicyclohexyl) carbonates and 4’-(4-(trans,trans-4-alkyl)-4-cyanobicyclohexane, dispersed with fluorescent dye (Benzo 2,1,3 Thiadiazole) in two different concentrations. Photoluminescence has been enhanced for a dye dispersed system which is the key finding of this investigation. UV absorbance study has also been performed and found to be increased for composite system. Enhanced birefringence after dispersion of dye into pure NLC is also a prominent result of this investigation. Relative permittivity, threshold voltage and dielectric anisotropy have also been measured and found to be increased. The outcome of the present work may be very useful in the construction of liquid crystal displays (LCDs).

Go to article

Authors and Affiliations

G. Pathak
K. Agrahari
A. Roy
A. Srivastava
O. Strzezysz
K. Garbat
R. Manohar
Download PDF Download RIS Download Bibtex

Abstract

The aim of this work was to induce permanent birefringence both in typical liquid crystal cells and photonic crystal fibers (PCFs) by photo-polymerization. For this purpose three different liquid crystalline materials, namely E7, 5CB, and 6CHBT were combined with a mixture of RM257 monomer and a UV sensitive initiator with the percentage weight less than 10%. Due to the photo-polymerization process it was possible to achieve polymer-stabilized liquid crystal orientation inside LC cells and micro-sized cylindrical glass tubes. In particular, periodic change in spatial molecular orientation was achieved by selective photo-polymerization. Successful results obtained in these simple geometries allowed for the experimental procedure to be repeated in PCFs leading to locally-induced permanent birefringence in PCFs.

Go to article

Authors and Affiliations

M.S. Chychłowski
S. Ertman
K. Rutkowska
O. Strzeżysz
R. Dąbrowski
T.R. Woliński
Download PDF Download RIS Download Bibtex

Abstract

PCFs (Photonic Crystal Fibers) with ‘T’ – shaped core have been proposed in this paper. ‘T’ –shaped core PCF structures have been analyzed using two different background materials: silica and lead silicate. A total of 3600 rotation at an interval of 900 has been introduced in the design of PCF structures. PCF structures A, B, C and D with rotation of 00, 900, 1800 and 2700 have silica as wafer. Similarly PCF structures E, F, G and H with similar rotation have lead silicate as background material. Numerical investigations shows structures ‘D’, ‘F’, ‘G’ and ‘H’ to have anomalous dispersion. PCF structures ‘F’, ‘G’, and ‘H’ have reported birefringence of the order of 10-2. Besides, other PCF structures report birefringence of the order of 10-3. Ultra low confinement loss has been observed in all the investigated PCF structures. Moreover, splice loss observed by the structure is very low. Large mode area has been shown by all the designed PCF structures.

Go to article

Authors and Affiliations

Pranaw Kumar
Amrit Tripathy
Jibendu Sekhar Roy
Download PDF Download RIS Download Bibtex

Abstract

In the paper, an extended analysis of the polarization properties of a liquid crystal cell with a biconically tapered single-mode telecommunication optical fiber was presented. These properties are a result of a sample geometry and used LC materials. They were analyzed by using two theoretical models based on the matrix decomposition methods, i.e., polar and singular-value one. By measuring Mueller matrices, information about losses, depolarization, dichroism and birefringence was obtained. In the experiment two types of tested samples filled with well-known 6CHBT and E7 liquid crystals were prepared and all optical parameters were shown as the voltage dependence. The tested samples have dichroic properties and for both models calculated PDL is similar and it increases from 2.6 to 6.6 dB for E7 and from 0.4 to 2.7 dB for 6CHBT with voltage changes within the range of 40 – 190 V. Optical losses simultaneously decrease from 30 dB to 27 dB and from 36 dB to 28 dB, respectively. The birefringence properties cannot be directly comparable due to differences between both applied models but voltage fluctuations of these parameters are not significant. These results confirm expected dichroic properties of designed device and complete knowledge about its working principles. Moreover, presented analysis validates usefulness of the singular-value decomposition model applied to dichroic optical fiber elements.

Go to article

Authors and Affiliations

P. Marć
K. Stasiewicz
J. Korec
L.R. Jaroszewicz
ORCID: ORCID
P. Kula
Download PDF Download RIS Download Bibtex

Abstract

A new technique of Mueller-matrix mapping of the birefringent structure of biological preparations of human organs tissues is suggested. The algorithms of reconstruction of average values and magnitude of fluctuations of the phase (birefringence) and amplitude (dichroism) of optically anisotropic structure of myocardium and connective tissue component of the vaginal wall histological section are proposed. The magnitudes and ranges of changes in the statistical moments of the 1st-4th order that characterize the distribution of average values and magnitude of fluctuations of birefringence and dichroism of the myocardium and connective tissue of the vaginal tissues histological sections were determined. Joint studies of distributions of the characteristics of phase and amplitude of the anisotropy of myocardium and connective tissue component of the vaginal wall tissues of different states were performed. The cases of various necrotic changes in the myocardium and pathological conditions of the vagina wall (prolapse of the genitals) are examined. Balanced accuracy of the method of Mueller-matrix polarization-phase and diffuse tomography of optically anisotropic polycrystalline networks in the differentiation of necrotic and pathological changes in human organs is determined.

Go to article

Authors and Affiliations

L. Trifonyuk
W. Baranowski
V. Ushenko
O. Olar
A. Dubolazov
Yu. Ushenko
B. Bodnar
O. Vanchulyak
L. Kushnerik
M. Sakhnovskiy

This page uses 'cookies'. Learn more