Measurement of the optical activity of anisotropic samples by transmission Mueller matrix ellipsometry

Arteaga, Oriol; Canillas, A.

doi:10.1051/epjconf/20100503001

Cited by 12 publications

(16 citation statements)

References 13 publications

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“…The Dual-PEM Mueller matrix polarimeter instrument and the data analysis were essentially the same as those reported previously [ 18 ]. The instrument used to measure the Mueller matrices of CLM cell system is a two-modulator generalized ellipsometer (2-MGE) [ 19 , 20 ].…”

Section: Methodsmentioning

confidence: 99%

Chiroptical Measurement of Chiral Aggregates at Liquid-Liquid Interface in Centrifugal Liquid Membrane Cell by Mueller Matrix and Conventional Circular Dichroism Methods

et al. 2011

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The centrifugal liquid membrane (CLM) cell has been utilized for chiroptical studies of liquid-liquid interfaces with a conventional circular dichroism (CD) spectropolarimeter. These studies required the characterization of optical properties of the rotating cylindrical CLM glass cell, which was used under the high speed rotation. In the present study, we have measured the circular and linear dichroism (CD and LD) spectra and the circular and linear birefringence (CB and LB) spectra of the CLM cell itself as well as those of porphyrine aggregates formed at the liquid-liquid interface in the CLM cell, applying Mueller matrix measurement method. From the results, it was confirmed that the CLM-CD spectra of the interfacial porphyrin aggregates observed by a conventional CD spectropolarimeter should be correct irrespective of LD and LB signals in the CLM cell.

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Section: Methodsmentioning

confidence: 99%

Chiroptical Measurement of Chiral Aggregates at Liquid-Liquid Interface in Centrifugal Liquid Membrane Cell by Mueller Matrix and Conventional Circular Dichroism Methods

et al. 2011

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“…The corresponding treatment was exact in the sense that the full dielectric tensor function was obtained, but simplified by the assumption of normal incidence, a condition that is naturally not fulfilled in Variable Angle Spectroscopic ellipsometry. While it took until 2010 before corresponding analytic formula for non‐normal incidence were derived, progress was nevertheless made, e. g. concerning obtaining the principal dielectric components, and the separation of the influence of linear and circular birefringence and dichroism . The first exact quantitative analysis of monoclinic crystals under non‐normal light incidence was then performed nearly simultaneously with NIR‐VIS‐UV ellipsometry and IR reflectance spectroscopy in 2011 and 2012 ,.…”

Section: Introductionmentioning

confidence: 99%

“…While it took until 2010 before corresponding analytic formula for non-normal incidence were derived, [13] progress was nevertheless made, e. g. concerning obtaining the principal dielectric components [14,15] and the separation of the influence of linear and circular birefringence and dichroism. [16] The first exact quantitative analysis of monoclinic crystals under non-normal light incidence was then performed nearly simultaneously with NIR-VIS-UV ellipsometry and IR reflectance spectroscopy in 2011 and 2012. [17,18] The later immediately followed the first quantitative analysis of triclinic crystals in 2013.…”

Section: Introductionmentioning

confidence: 99%

Employing Theories Far beyond Their Limits – Linear Dichroism Theory

Mayerhöfer

2018

ChemPhysChem

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Using linear polarized light, it is possible in case of ordered structures, such as stretched polymers or single crystals, to determine the orientation of the transition moments of electronic and vibrational transitions. This not only helps to resolve overlapping bands, but also assigning the symmetry species of the transitions and to elucidate the structure. To perform spectral evaluation quantitatively, a sometimes "Linear Dichroism Theory" called approach is very often used. This approach links the relative orientation of the transition moment and polarization direction to the quantity absorbance. This linkage is highly questionable for several reasons. First of all, absorbance is a quantity that is by its definition not compatible with Maxwell's equations. Furthermore, absorbance seems not to be the quantity which is generally compatible with linear dichroism theory. In addition, linear dichroism theory disregards that it is not only the angle between transition moment and polarization direction, but also the angle between sample surface and transition moment, that influences band shape and intensity. Accordingly, the often invoked "magic angle" has never existed and the orientation distribution influences spectra to a much higher degree than if linear dichroism theory would hold strictly. A last point that is completely ignored by linear dichroism theory is the fact that partially oriented or randomly-oriented samples usually consist of ordered domains. It is their size relative to the wavelength of light that can also greatly influence a spectrum. All these findings can help to elucidate orientation to a much higher degree by optical methods than currently thought possible by the users of linear dichroism theory. Hence, it is the goal of this contribution to point out these shortcomings of linear dichroism theory to its users to stimulate efforts to overcome the long-lasting stagnation of this important field.

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“…For instance, numerous works have been mostly dedicated to characterizing material media (thin film, dielectric materials, metasurfaces, etc. ), converting experimental polarimeters into ellipsometers [ 8 , 9 , 10 ]. Advances in the remote sensing research field have allowed Mueller polarimeters to focus on the target detection of micro-/nano-particles in a turbid or highly scattering medium [ 11 , 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Circular Intensity Differential Scattering for Label-Free Chromatin Characterization: A Review for Optical Microscopy

2020

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Circular Intensity Differential Scattering (CIDS) provides a differential measurement of the circular right and left polarized light and has been proven to be a gold standard label-free technique to study the molecular conformation of complex biopolymers, such as chromatin. In early works, it has been shown that the scattering component of the CIDS signal gives information from the long-range chiral organization on a scale down to 1/10th–1/20th of the excitation wavelength, leading to information related to the structure and orientation of biopolymers in situ at the nanoscale. In this paper, we review the typical methods and technologies employed for measuring this signal coming from complex macro-molecules ordering. Additionally, we include a general description of the experimental architectures employed for spectroscopic CIDS measurements, angular or spectral, and of the most recent advances in the field of optical imaging microscopy, allowing a visualization of the chromatin organization in situ.

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Measurement of the optical activity of anisotropic samples by transmission Mueller matrix ellipsometry

Abstract: Abstract. In this work we review some of the approaches we have developed to study the optical activity in anisotropic samples. They all are based in the spectroscopic measurement of the normalized Mueller matrices of the samples.

Cited by 12 publications

References 13 publications

Chiroptical Measurement of Chiral Aggregates at Liquid-Liquid Interface in Centrifugal Liquid Membrane Cell by Mueller Matrix and Conventional Circular Dichroism Methods

Chiroptical Measurement of Chiral Aggregates at Liquid-Liquid Interface in Centrifugal Liquid Membrane Cell by Mueller Matrix and Conventional Circular Dichroism Methods

Employing Theories Far beyond Their Limits – Linear Dichroism Theory

Circular Intensity Differential Scattering for Label-Free Chromatin Characterization: A Review for Optical Microscopy

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