Optical anisotropy of synthetic opals

Rėza, A.; Šimkienė, I.; Vaišnoras, R.; López, Cefe; Golmayo, D.; Babonas, J.

doi:10.1016/j.photonics.2010.10.003

Cited by 4 publications

(4 citation statements)

References 29 publications

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“…For nonoptically active systems a null CD signal should be expected, but due to their particular compact fcc periodic structure, photonic crystals can indeed exhibit a significant CD near the stop-band frequencies, especially at off-normal incidence. 32,33 Here we show that this effect can be quite large even at normal incidence. Indeed, we see in Figure 4 that the CD spectrum of the opal infiltrated with 8 nm Ni nanoparticles is significantly large around the stop band.…”

Section: Resultsmentioning

confidence: 56%

“…Following the commonly used approach, we performed CD experiments by recording the intensity of the light transmitted though the opals (see inset of Figure ) while sweeping the wavelengths in the absence of any magnetic field. For nonoptically active systems a null CD signal should be expected, but due to their particular compact fcc periodic structure, photonic crystals can indeed exhibit a significant CD near the stop-band frequencies, especially at off-normal incidence. , Here we show that this effect can be quite large even at normal incidence. Indeed, we see in Figure that the CD spectrum of the opal infiltrated with 8 nm Ni nanoparticles is significantly large around the stop band.…”

Section: Resultsmentioning

confidence: 59%

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Magnetophotonic Response of Three-Dimensional Opals

et al. 2011

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Three-dimensional magnetophotonic crystals (3D-MPCs) are being postulated as appropriate platforms to tailor the magneto-optical spectral response of magnetic materials and to incorporate this functionality in a new generation of optical devices. By infiltrating self-assembled inverse opal structures with monodisperse nickel nanoparticles we have fabricated 3D-MPCs that show a sizable enhancement of the magneto-optical signal at frequencies around the stop-band edges of the photonic crystals. We have established a proper methodology to disentangle the intrinsic magneto-optical spectra from the nonmagnetic optical activity of the 3D-MPCs. The results of the optical and magneto-optical characterization are consistent with a homogeneous magnetic infiltration of the opal structure that gives rise to both a red-shift of the optical bandgap and a modification of the magneto-optical spectral response due to photonic bandgap effects. The results of our investigation demonstrate the potential of 3D-MPCs fabricated following the approach outlined here and offer opportunities to adapt the magneto-optical spectral response at optical frequencies by appropriate design of the opal structure or magnetic field strength.

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Section: Resultsmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 59%

Magnetophotonic Response of Three-Dimensional Opals

et al. 2011

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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. As a result, in magnetic field, the bulk opal crystal should correspond to a gyro-anisotropic structure [22], the polarization properties of which become quite complicated.…”

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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“…A problem in evaluating the magneto-optical response of opal-based MPCs is an optical activity that stems from their structures, which has been pointed out recently. 12,14,20 Anisotropy appears both intrinsically due to the symmetry in opal structure and extrinsically due to internal strains during the fabrication. The anisotropy causes optical birefringence and dichroism, which overlap the magneto-optical response in the measurement.…”

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confidence: 99%

Modified Faraday rotation in a three-dimensional magnetophotonic opal crystal consisting of maghemite/silica composite spheres

Murai

Yao

Nakamura

et al. 2012

Applied Physics Letters

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We have prepared a three-dimensional magnetophotonic crystal and observed modulated Faraday rotation around its photonic band gap. The magnetophotonic crystal was prepared by the self-assembly of highly monodispersed silica spheres, which were heavily impregnated with maghemite (c À Fe 2 O 3 ) nanoparticles. The slab sample with a thickness of 10 lm shows a clear photonic band gap centered at k ¼ 620 nm in optical transmittance. Faraday rotation is notably modified inside the photonic band gap. V

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Optical anisotropy of synthetic opals

Cited by 4 publications

References 29 publications

Magnetophotonic Response of Three-Dimensional Opals

Magnetophotonic Response of Three-Dimensional Opals

Magnetooptics of opal crystals modified by cobalt nanoparticles

Modified Faraday rotation in a three-dimensional magnetophotonic opal crystal consisting of maghemite/silica composite spheres

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