&lt;title&gt;Measurement of 2D birefringence distribution&lt;/title&gt;

Noguchi, Masato; Ishikawa, Tsuyoshi; Ohno, M.; Tachihara, Satoru

doi:10.1117/12.132143

Cited by 10 publications

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“…The analyzer transforms the phase difference between two orthogonal polarization modes into the transmitted intensity map. The earliest 2D retardance mapping techniques were reported in 1992 by Noguchi et al [4] and Otani et al [5]. Noguchi used a PSG with a rotated quarter-wave plate and the left circular analyzer.…”

Section: Introductionmentioning

confidence: 99%

“…The phase retardance of the LC cells could be controlled by the applied electric field, which tilts the optical axis (in an LC, the optical axis is also the director of molecular orientation). Similarly, to the Noguchi's scheme [4], they combined the universal compensator with a left circular analyzer and named the new microscope a Pol-Scope [12,13]. Later Shribak proposed several improved algorithms, which increased sensitivity and reduced the acquisition time of the 2D retardance mapping [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Instantaneous mapping of liquid crystal orientation using a polychromatic polarizing microscope

2022

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Polarizing microscopy brought about many advancements in the science of liquid crystals and other soft materials, including those of biological origin. Recent developments in optics and computer-based analysis enabled a new generation of quantitative polarizing microscopy which produces spatial maps of the optic axis. Unfortunately, most of the available approaches require a long acquisition time of multiple images which are then analyzed to produce the map. We describe a polychromatic polarizing microscope, which allows one to map the patterns of the optical axis in a single-shot exposure, thus enabling a fast temporal resolution. We present a comparative analysis of the new microscope with alternative techniques such as a conventional polarizing optical microscope and MicroImager of Hinds Instruments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Instantaneous mapping of liquid crystal orientation using a polychromatic polarizing microscope

2022

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“…The first techniques were reported by and Noguchi et al [7] and Otani et al [8]. Noguchi used the first PSG configuration and the left circular analyzer.…”

Section: Introductionmentioning

confidence: 99%

Complete polarization state generator with one variable retarder and its application for fast and sensitive measuring of two-dimensional birefringence distribution

Shribak

2011

J. Opt. Soc. Am. A

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The complete polarization state generator, which consists of one rotatable polarizer and one variable retarder with quarter-wave plate, is introduced. The orientation angle of its output polarization ellipse equals to half retardance of the variable retarder, and the ellipticity angle corresponds to the polarizer azimuth. The PSG is employed in the quantitative orientation-independent differential polarization microscope, which uses polarized light states with the same ellipticity and different orientation angles. The image processing algorithms with using three or four frames are described.

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“…Methods have been developed for the measurement of two‐dimensional images of linear birefringence and directions of the fast and slow axes (extinction, ϕ) based on optical modulation (Noguchi et al , 1992; Mei & Oldenbourg, 1994; Oldenbourg & Mei, 1994, 1995; Otani et al , 1994; Bajor, 1995; Glazer et al , 1996; Shribak, 1996; Glazer & Cosier, 1997; Shribak et al , 1999; Yeh et al , 1999; Zhu et al , 1999; Geday et al , 2000; Zhu et al , 2002; Owen & Garman, 2005). Tilting a uniaxial crystal sample has also produced three‐dimensional maps of birefringence and eigenrays (Pajdzik & Glazer, 2006).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous false‐colour imaging of birefringence, extinction and transmittance at camera speed

Kaminsky

Gunn

Sours

et al. 2007

Journal of Microscopy

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SummaryA polarized light imaging technique is introduced that simultaneously captures and unfolds transmittance, fast/slow axes directions and birefringence or linear dichroism from single camera exposures. The technique, based on the rotating polarizer method, is capable of sampling an object through polarizers at four different angles in a single image with the use of an image multiplexer. The range of possible applications is demonstrated with examples from the fields of biology, medicine, forensics and material sciences.

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<title>Measurement of 2D birefringence distribution</title>

Cited by 10 publications

References 0 publications

Instantaneous mapping of liquid crystal orientation using a polychromatic polarizing microscope

Instantaneous mapping of liquid crystal orientation using a polychromatic polarizing microscope

Complete polarization state generator with one variable retarder and its application for fast and sensitive measuring of two-dimensional birefringence distribution

Simultaneous false‐colour imaging of birefringence, extinction and transmittance at camera speed

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