Form birefringence of oxidized porous silicon

Golovan, L. A.; Ivanov, Dimitri A.; Melnikov, V.A.; Timoshenko, V. Yu.; Желтиков, А. М.; Кашкаров, П. К.; Petrov, Georgi I.; Yakovlev, Vladislav V.

doi:10.1063/1.2212534

Cited by 18 publications

(7 citation statements)

References 23 publications

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“…Indeed, form birefringence applications transcend the biological field, even being used to study the characteristics and properties of man-made devices (Beche and Gaviot, 2003;Hamza et al, 2004;O et al, 2004;Neale et al, 2005;Pang et al, 2005;Vasanthan, 2005;Golovan et al, 2006). Furthermore, Beche and Gaviot (2003), when defining form birefringence (''In optics, an anisotropy property on the permittivity tensor, called form birefringence.…”

Section: General Aspects Of the Birefringent Imagesmentioning

confidence: 99%

Structural organization of collagen fibers in chordae tendineae as assessed by optical anisotropic properties and Fast Fourier transform

Vidal

Mello

2009

Journal of Structural Biology

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The structural and supraorganizational arrangement of the chordae tendineae components is very important for a better understanding of their morphophysiological relationships. This study aims to evaluate the degree of statistical variability of the distribution and orientation of collagen fibers and their undulations (crimps), in porcine chordae tendineae. Polarization microscopy, in association with image analysis, was used for the analysis of birefringent images and detection of surface plots, Fast Fourier transforms, and form birefringence curve profiles. A marked variability in the collagen fiber's twisted and intertwined orientation was found not only along the long axis of the chordae tendineae but also in their 3-D structure, including that of the crimp structures. Crimp was demonstrated to not represent a homogeneous distribution of bands; the best methods to quantify its variability were the Fast Fourier transform and the line profile extended along the long axis of the chordae tendineae. Collagen fiber rings, considered to possibly protecting the integrity of the chordae tendineae, were observed to wrap around them. A statistically helical structure is assumed for the supraorganization of the collagen fibers in the chordae tendineae, which is suggested here to be a chiral body.

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Section: General Aspects Of the Birefringent Imagesmentioning

confidence: 99%

Structural organization of collagen fibers in chordae tendineae as assessed by optical anisotropic properties and Fast Fourier transform

Vidal

Mello

2009

Journal of Structural Biology

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“…The orientation of pores formed in crystalline silicon result in a strong Δ F thereby enhancing the nonlinear-optical interactions (Golovan et al 2006). Other examples have been found in the search for form birefringence modeling for sensors in porous silicon fi lms (O et al 2004).…”

mentioning

confidence: 99%

“…Because even mechanical properties depend on molecular order, birefringence and infrared dichroism are used to measure such orientation (Vasanthan 2005). Studies that employed the principles of form birefringence in structural fabrication established the relation between nanostructure and properties of porous silicon and form birefringence (Bêche and Gaviot 2003, O et al 2004, Neale et al 2005, Vasanthan 2005, Golovan et al 2006, Tsai et al 2006. Verbiest et al (1998) demonstrated a strong enhancement of nonlinear optical properties through supramolecular chirality, determined by interaction of the electric fi eld of light waves with molecules in a medium of propagation, which results in optical phenomena such as birefringence.…”

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confidence: 99%

Form birefringence as applied to biopolymer and inorganic material supraorganization

2010

Biotechnic & Histochemistry

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I review here form, or textural, birefringence (Δ(F)) in the context of advances in the field, as well as with regard to findings and applications in the physics of photonic devices, fibers maintaining polarization, photonic crystal fibers, and in biopolymers present in extracellular matrices and the myelin sheath. Some advantages of applying knowledge of Δ(F) to biological fields involving biopolymers, especially collagen fibers, are considered in more detail. Tendon and cartilage collagen fibers have been regarded as a model of dense, highly aggregated biopolymers with preferential orientations. Owing to their supramolecular organization, such materials may be used to study molecular order by using anisotropic optical properties, especially Δ(F). Differences between collagen type I- and collagen type II-rich structures, and similarities between collagen crimp and second harmonic generation images are reported. Based on data reported here, it is possible to deduce that collagen type I supramolecular organization has nonlinear optical properties and that tendon segments can conduct red laser light. With respect to nerve fibers, the detection and measurements of Δ(F) have allowed the myelin sheath to be considered a smectic liquid crystal.

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“…During the last few years birefringence caused by form‐anisotropy of 2D nanostructures has been studied intensively both experimentally and theoretically for different systems in a wide spectral range. Artificial birefringence has been reported for porous silicon 1, porous alumina 2, 3, oxidized porous silicon 4, and porous GaP 5 in the visible and near infrared spectral regions. Also an artificial birefringence of stacked hollow acrylic pipes in a triangular array 6 in the microwave region has been demonstrated.…”

Section: Introductionmentioning

confidence: 97%

Form‐anisotropy of 2D nanostructures: Modeling approaches comparison

Lutich

Gaponik

Eychmüller

et al. 2009

Physica Status Solidi (a)

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For the first time different effective medium approximations that are widely used for effective refractive index and form‐anisotropy simulations in 2D nanostructures are compared to the plane‐wave expansion approach from the point of view of the refractive indices and form‐birefringence simulation accuracy. Applicability criteria (porosity and refractive index contrast regions) for the different effective medium models are analyzed on the basis of the comparison to the results obtained by means of the plane‐wave expansion approach. It is shown that simplified approaches at certain structural parameters lead to unacceptable inaccuracy of the form‐birefringence calculations whereas they give reasonably rough estimates of the effective refractive index.

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Form birefringence of oxidized porous silicon

Cited by 18 publications

References 23 publications

Structural organization of collagen fibers in chordae tendineae as assessed by optical anisotropic properties and Fast Fourier transform

Structural organization of collagen fibers in chordae tendineae as assessed by optical anisotropic properties and Fast Fourier transform

Form birefringence as applied to biopolymer and inorganic material supraorganization

Form‐anisotropy of 2D nanostructures: Modeling approaches comparison

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