Physical studies of porphyrin-infiltrated opal crystals

Sabataityte, J.; Šimkienė, I.; Babonas, G.-J.; Rėza, A.; Baran, M.; Szymczak, R.; Vaišnoras, R.; Rastenienė, Loreta; Голубев, В. Г.; Kurdyukov, D. A.

doi:10.1016/j.msec.2006.09.048

Cited by 8 publications

(8 citation statements)

References 15 publications

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“…In the latter case, this effect was determined to be most likely due to the birefringence in the strained sample of the opal crystal. It should be noted that in the spectral region of the stop band, a strong dispersion of apparent optical constants was observed in direct birefringence measurements [7]. The birefringence was of the order of 2×10 -4 for this series of investigated samples.…”

Section: Resultsmentioning

confidence: 52%

Ellipsometric studies of opal crystals

Rėza¹,

Tamasevicius²,

Babonas³

et al. 2008

Phys. Status Solidi (c)

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Spectroscopic ellipsometry investigations have been performed on synthetic opal crystals containing SiO2 spheres having a diameter of D ∼250 nm. The optical features in the spectra of ellipsometric parameters Ψ and Δ were observed in the region of stop band (500‐550 nm). The ellipsometric spectra were separated due to diffraction and specular reflection. The data were interpreted by using effective homogeneous and stacked multi‐layer media models. The average index of refraction of the opal photonic crystal was estimated in the first model and the angle‐resolved spectra were qualitatively described by the second model. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Resultsmentioning

confidence: 52%

Ellipsometric studies of opal crystals

Rėza¹,

Tamasevicius²,

Babonas³

et al. 2008

Phys. Status Solidi (c)

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“…The CD signal increased in series of experimental runs in which the refractive index contrast was increased by immersion of opal sample in hexane-toluene solutions. The CD signal can be related to the linear birefringence of opal crystals [3] the dispersion of which increases significantly approaching the stop band. Due to the birefringence, the circular polarization of incident light transforms into elliptical at the propagation of electromagnetic waves through PC and it is registered as CD signal.…”

Section: Resultsmentioning

confidence: 99%

“…In order to control photonic properties, PCs were infiltrated with different materials. A variety of tunable PCs were prepared using templates with the structure of opals and inverse opals, the voids of which were filled with metals, semiconductors, and organic compounds [2,3]. It was found that photonic band structure of synthetic opal could be controlled by external illumination due to infiltrated photochromic dye aggregates [4].…”

Section: Introductionmentioning

confidence: 99%

Magnetic circular dichroism of opal crystals infiltrated with iron porphyrin

Rėza¹

2008

Lithuanian J. Phys.

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Synthetic opal crystals composed of silica spheres of diameter ∼250 nm were infiltrated with highly concentrated (10 mM) buffered phosphate solution of iron porphyrin (FeTPPS). Magnetic circular dichroism (MCD) in the visible spectral range was investigated on hybrid samples immersed in polar (ethanol) or non-polar (hexane, toluene) solutions and situated in magnetic field. The MCD effect was observed in the spectral region of 550-650 nm in the vicinity of Q-absorption bands of FeTPPS. In 350 mT magnetic field the relative optical transmission change by 2.4·10 −4 was determined at the Q0-band of 0.3 mm thick infiltrated opal sample. The dispersion-like lineshape of MCD spectra corresponded to the A-type term. An average refraction index and refraction index contrast of composite system was controlled by immersion of infiltrated opal samples into various liquids. As a result, the spectral position of the stop band in opal photonic crystal was tuned with respect to FeTPPS absorption bands. When the Q band of FeTPPS was within the stop band of opal, the optical contrast of photonic crystal was changed by external magnetic field due to the MCD effect.

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“…However, in some bulk opal samples the birefringence induced by residual strain was observed [20] leading to the presence of linear birefringence LB. In addition, in opal crystals intrinsic optical anisotropy was detected [21] in the region of the stop band.…”

Section: Methodsmentioning

confidence: 99%

Magnetooptics of opal crystals modified by cobalt nanoparticles

Šimkienė¹,

Rėza²,

Kindurys³

et al. 2010

Lithuanian J. Phys.

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Optical and magnetooptical properties of opal photonic crystals modified by Co nanoparticles have been investigated by modulation spectroscopy technique in the visible spectral range from 400 to 800 nm. The Co nanoparticles of 1 to 8 nm in size were formed by means of chemical reduction reaction inside synthetic opal crystals composed of regularly close-packed SiO2 spheres of diameter 250-300 nm. As it was estimated from the spectral shift of the stop band of photonic crystals, Co nanoparticles occupied up to several percent of void volume in opal crystal lattice. In the Faraday configuration, external magnetic field induced the change in optical transmission normalized to sample thickness 1 cm and magnetic field 1 T equal to 0.10-0.35 for Co-modified opal crystals in the spectral range under consideration. The fabricated hybrid structures can be considered as a possible prototype of magnetophotonic crystals.

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Physical studies of porphyrin-infiltrated opal crystals

Cited by 8 publications

References 15 publications

Ellipsometric studies of opal crystals

Ellipsometric studies of opal crystals

Magnetic circular dichroism of opal crystals infiltrated with iron porphyrin

Magnetooptics of opal crystals modified by cobalt nanoparticles

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