Spectroscopic Mueller polarimeter based on liquid crystal devices

Garcia-Caurel, Enric; Martino, A. De; Drévillon, B.

doi:10.1016/j.tsf.2003.12.056

Cited by 106 publications

(63 citation statements)

References 7 publications

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“…Then, Eq. (9) and (10) δS δI q (11) note that the summation of the four δS i of the obtained Stokes vector is equivalent to the EWV. Equation (11) shows the error amplification corresponding to every parameter of the solution vector S in presence of noise in the intensity measurements vector I.…”

Section: Polarimeter Mathematical Description and Optimization Criteriamentioning

confidence: 99%

“…Recently, LC based devices have been also applied in the implementation of polarimeters [11,12]. Some features of liquid crystals, as its birefringence and the possibility of orientating its molecules with an applied voltage, give them the capability to perform as variable waveplates whose retardance varies as the addressed voltage is changed.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimization and performance criteria of a Stokes polarimeter based on two variable retarders

Peinado¹,

Lizana²,

Vidal³

et al. 2010

Opt. Express

109

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Abstract:In this paper we present the analysis, optimization and implementation of several Stokes polarimeter configurations based on a setup including two variable retarders. The polarimeter analysis is based on the Mueller-Stokes formalism, and as a consequence, it is suitable to deal with depolarized light. Complete Stokes polarimeters are optimized by minimizing the amplification of simulated errors into the final solution. Different indicators useful to achieve this aim, as the condition number or the equally weighted variance, are compared in this paper. Moreover, some of the optimized polarimeters are experimentally implemented and it is studied the influence of small deviations from the theoretical ones on the amplification of the Stokes component error. In addition, the benefit of using incomplete polarimeters, when detecting specific ranges of states of polarization, is discussed.

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Section: Polarimeter Mathematical Description and Optimization Criteriamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization and performance criteria of a Stokes polarimeter based on two variable retarders

Peinado¹,

Lizana²,

Vidal³

et al. 2010

Opt. Express

109

View full text Add to dashboard Cite

show abstract

“…The incident light was modulated by using a polarization state generator (PSG), comprising a polarizer and two nematic liquid crystals with fixed axes and variable retardations. [27][28][29][30][31][32] The light backscattered by the sample was analyzed with a polarization state analyzer (PSA), a "mirror image" of the PSG, composed by the same PSG optical elements but placed in reverse order. Using a telescopic set of lenses on the illumination arm, with an iris placed at their common focus, the fiber's output is imaged inside the PSG.…”

Section: Methodsmentioning

confidence: 99%

Multispectral Mueller polarimetric imaging detecting residual cancer and cancer regression after neoadjuvant treatment for colorectal carcinomas

et al. 2013

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Abstract. This work is devoted to a first exploration of Mueller polarimetric imaging for the detection of residual cancer after neoadjuvant treatment for the rectum. Three samples of colorectal carcinomas treated by radiochemotherapy together with one untreated sample are analyzed ex vivo before fixation in formalin by using a multispectral Mueller polarimetric imaging system operated from 500 to 700 nm. The Mueller images, analyzed using the Lu-Chipmann decomposition, show negligible diattenuation and retardation. The nonirradiated rectum exhibits a variation of depolarization with cancer evolution stage. At all wavelengths on irradiated samples, the contrast between the footprint of the initial tumor and surrounding healthy tissue is found to be much smaller for complete tumor regression than when a residual tumor is present, even at volume fractions of the order of 5%. This high sensitivity is attributed to the modification of stromal collagen induced by the cancer. The depolarization contrast between treated cancer and healthy tissue is found to increase monotonously with the volume fraction of residual cancer in the red part of the spectrum. Polarimetric imaging is a promising technique for detecting short-time small residual cancers, which is valuable information for pathological diagnosis and patient management by clinicians.

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“…DeMartino et al [143,144] and Garcia-Caurel et al [145] applied the condition number minimization approach to spectroscopic polarimeters using photoelastic modulators and liquid crystal retarders. Many of these researchers have treated the effect of random detection noise on polarimeter performance.…”

Section: 8: Conclusionmentioning

confidence: 99%

GDx-MM: An Imaging Mueller Matrix Retinal Polarimeter

Twietmeyer

2007

Frontiers in Optics 2007/Laser Science XXIII/Organic Materials and Devices for Displays and Energy Conversion

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Spectroscopic Mueller polarimeter based on liquid crystal devices

Cited by 106 publications

References 7 publications

Optimization and performance criteria of a Stokes polarimeter based on two variable retarders

Optimization and performance criteria of a Stokes polarimeter based on two variable retarders

Multispectral Mueller polarimetric imaging detecting residual cancer and cancer regression after neoadjuvant treatment for colorectal carcinomas

GDx-MM: An Imaging Mueller Matrix Retinal Polarimeter

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