Light polarization states of a cholesteric liquid crystal probed with optical ellipsometry

Therézio, Eralci M.; Silva, Silésia F.C. da; Dalkiranis, Gustavo G.; Filho, Paulo Alliprandini; Santos, George C.; Ely, Fernando; Bechtold, Ivan H.; Marletta, Alexandre

doi:10.1016/j.optmat.2015.07.010

Cited by 11 publications

(13 citation statements)

References 31 publications

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“…Moreover, it is also possible to obtain the dissymmetry factor g the circularly polarized light emission degree and the anisotropy factor r, it is associated with molecular ordering of the polymer chains [22,43]. These factors are obtained from the Stokes parameters in Eqs.…”

Section: Emission Ellipsometry (Ee)mentioning

confidence: 99%

“…However, for EtNBF10 ilm thickness, we observe, in Figure 4b signiicant variation for the S 1 /S 0 and S 2 /S 0 parameters. In principle, the ilms grown using electrochemical techniques have not molecular order [40], but they may have partially polarized emission when the excitation light is linearly polarized [9,24,40,43]. Another important observation is that the inversion signal of the S 1 /S 0 curve occurs simultaneously with the reversal of S 2 /S 0 curve.…”

Section: Emission Ellipsometry In P3ddtmentioning

confidence: 99%

“…(6)) that may be correlated with the direction of the polymer chains and the dissymmetry factor g (Eq. (5)) associated with the emission of the circularly polarized light [22,40,43]. The parameters P, r and g are obtained directly from Stokes parameter values [22,43].…”

Section: Emission Ellipsometry In P3ddtmentioning

confidence: 99%

“…(5)) associated with the emission of the circularly polarized light [22,40,43]. The parameters P, r and g are obtained directly from Stokes parameter values [22,43]. Figures 5a and 7a show the polarization degree parameters for the EtNBF10 ilm in the function of the emission wavelength, presenting maximum at 495 and 630 nm.…”

Section: Emission Ellipsometry In P3ddtmentioning

confidence: 99%

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Electrochemical Deposition of P3AT Films Used as a Probe of Optical Properties in Polymeric System

Sá¹,

Basílio²,

Santana³

et al. 2017

Modern Technologies for Creating the Thin-Film Systems and Coatings

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Poly(3-alkylthiophene) (P3ATs) have been extensively used in photovoltaic devices such as a p-type organic Semiconductors. However, several electronic properties of P3ATs present energy transfer inter-and intra-chains that have direct consequences on the performance of optoelectronic devices. Traditionally electrochemical techniques, such as cyclic voltammetry, chronoamperometry and chronocoulometry, have been applied to process polymer thin ilms and unconventional spectroscopy techniques are used to characterize the electronic properties. In the present work, we used an innovative technique called ellipsometry emission to investigate the optical properties of P3AT ilms. We propose a new approach to study the electrochemical synthesize and unintentional doping processes of polymeric systems. We showed a strong correlation between the electrochemical synthesis and the optical properties controlling the ilm growth conditions for P3ATs. The results obtained in the present study can be potentially utilized for applications in organic devices, mainly in photovoltaic cells when the ilm deposition and the optical properties control are relevant.

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Section: Emission Ellipsometry (Ee)mentioning

confidence: 99%

Section: Emission Ellipsometry In P3ddtmentioning

confidence: 99%

Section: Emission Ellipsometry In P3ddtmentioning

confidence: 99%

Section: Emission Ellipsometry In P3ddtmentioning

confidence: 99%

See 2 more Smart Citations

Electrochemical Deposition of P3AT Films Used as a Probe of Optical Properties in Polymeric System

Sá¹,

Basílio²,

Santana³

et al. 2017

Modern Technologies for Creating the Thin-Film Systems and Coatings

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“…In addition, it is possible to obtain full information regarding molecular organization [2,12], anisotropy [10], and asymmetry [13] factors in photoluminescent materials. All these studies and several applications in diverse materials lead to the development of a new method for Raman Optical Activity studies, named ellipsometric Raman spectroscopy (ERS) [14,15].…”

Section: Introductionmentioning

confidence: 99%

Achromatic Ellipsometry: Theory and Applications

Therézio¹,

Dalkiranis²,

Vieira³

et al. 2017

Ellipsometry - Principles and Techniques for Materials Characterization

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In the present chapter, the theory and some applications of Achromatic Ellipsometry, including transmittance, absorbance, and emission, are presented. The new methodology introduced here comprises the calculation of Stokes parameters using Fourier series analysis. Light polarization was determined by calculating the polarization degree, anisotropy, asymmetry parameters, and rotational and ellipsometry angles. The nematic liquid crystal E7™ doped with 4,7-bis{2-[4-(4-decylpiperazin-1-yl) phenyl]ethynyl}-[2,1,3]-benzothiadiazole (5A) within twisted and parallel structures, was used to illustrate the applications for this technique, that has been shown to be an innovative and versatile tool to correlate the photophysics with materials structure.

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