Determination of unknown input polarisation using a twisted nematic liquid crystal display with fixed components

Blakeney, Susan; Day, SE; Stewart, J. N.

doi:10.1016/s0030-4018(02)02115-6

Cited by 22 publications

(17 citation statements)

References 6 publications

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“…This case is finally similar to that of twisted-nematic liquid crystals considered by Blakeney 17 . Clearly, this may lead to issues if we consider a broadband usage.…”

Section: Use Of a Retarder With Tunable Fast Axis Orientation As A Posupporting

confidence: 84%

Stokes imaging polarimetry using a single ferroelectric liquid crystal modulator

2010

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We already implemented an imaging polarimeter able to capture at high-speed the full information about linear polarization of a monochromatic light beam (namely its first three Stokes parameters). The polarizing element was a single ferroelectric liquid crystal cell, acting as a half-wave plate (therefore as a polarization rotator) at its design wavelength. In this paper, we report the improvement of our system in order to grab the full Stokes information, including the fourth Stokes parameter. The procedure consists in two operations. First, optimally controlling our polarization component with an additional fourth voltage level. Second, shifting the wavelength operation in order to get benefit of the device chromatic behavior: away from its design wavelength, the device does not behave as a half-wave plate any longer, and with proper level control, the system matrix of our polarization state analyzer (consisting of the liquid crystal cell and of a fixed linear polarizer) can reach rank 4. Therefore, elliptical polarization can be fully analyzed, as it could be with a nematic liquid crystal device, but at a much higher frame rate. Results of operation at 200 fps are provided.

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“…This case is finally similar to that of twisted-nematic liquid crystals considered by Blakeney 17 . Clearly, this may lead to issues if we consider a broadband usage.…”

Section: Use Of a Retarder With Tunable Fast Axis Orientation As A Posupporting

confidence: 84%

Stokes imaging polarimetry using a single ferroelectric liquid crystal modulator

2010

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“…Recently proposed polarimetry techniques utilize polarization-or intensity-modulated input light, optical heterodyne detection, advanced electronics, and post-measurement data processing with lock-in detection techniques to determine the polarization rotation with higher sensitivity (Goldstein, 1992;Chou et al, 1997;Berezhna et al, 2001;Blakeney et al, 2002).…”

Section: Method: the Rotating Polarization Polarimetermentioning

confidence: 99%

Astrobiological Polarimeter

et al. 2008

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Chirality is an excellent indicator of life, but naturally occurring astrobiological (as well as terrestrial) samples nearly always exhibit massive depolarizing light scattering, which renders conventional polarimeters useless. For astrobiological applications, we instead consider a novel polarimeter originally developed for non-invasive human-glucose measurement. It involves deliberately rotating in time the plane of polarization of a linearly polarized beam and detecting the shift in the plane of the rotating linearly polarized component of the transmitted light from a chiral sample relative to the input polarization plane. We find that this polarimeter can operate in 3 orders of magnitude more depolarizing scattering than conventional polarimeters. Furthermore, it can also be designed to be lightweight, compact, and energy efficient.

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“…Polarimeters based on modulating the input polarization (i.e. the optical phase) generally dither the instantaneous linear polarization by a few degrees about a mean linear polarization [28][29][30][31] . The signal amplitudes measured at various harmonics of the modulation frequency are then used to determine the sample-induced polarization rotation.…”

Section: Conventional Polarimetersmentioning

confidence: 99%

Astrobiological polarimeter

Kothari

Jafarpour

Thaler

et al. 2007

Instruments, Methods, and Missions for Astrobiology X

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Chirality is an excellent indicator of life, but naturally occurring terrestrial and extra-terrestrial samples nearly always exhibit massive depolarizing light scattering (DLS). This problem bears a striking resemblance to that of developing a chirality-based non-invasive glucose monitor for diabetics. Both applications require a lightweight, compact, efficient, and robust polarimeter that can operate despite significant DLS. So for astrobiological applications, we developed a polarimeter that was inspired from a polarimetry technique previously investigated for non-invasive in-vivo glucose-sensing. Our polarimeter involves continuously rotating the plane of linear polarization of a laser beam to probe a sample with DLS, and analyzing its transmission with a fixed analyzer to obtain a sinusoidal voltage signal. We lock-in detect this signal using a reference signal from an analogous set up without any sample. With milk as a scatterer, we find that this polarimeter detects chirality in the presence of three orders of magnitude more DLS than conventional polarimeters. It can accurately measure 0.1° of polarization rotation in the presence of 15% milk.

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Determination of unknown input polarisation using a twisted nematic liquid crystal display with fixed components

Cited by 22 publications

References 6 publications

Stokes imaging polarimetry using a single ferroelectric liquid crystal modulator

Stokes imaging polarimetry using a single ferroelectric liquid crystal modulator

Astrobiological Polarimeter

Astrobiological polarimeter

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