Tunable optical properties of conducting polymers infiltrated in synthetic opal as photonic crystal

Yoshino, Katsumi; Satoh, Shigenori; Shimoda, Yuki; Kajii, Hirotake; Tamura, T.; Kawagishi, Yoshiaki; Matsui, Tatsunosuke; Hidayat, Rahmat; Fujii, Akihiko

doi:10.1016/s0379-6779(00)00797-9

Cited by 12 publications

(3 citation statements)

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“…The inverse opal structure enables easy detection of index variations by Δn = 0.02 and has a tentative sensitivity limit of Δn ~ 10 -3 , or of the same order of magnitude as that of optical sensors based on 2D photonic crystal microcavities [7] and photonic crystal fibers [9]. Although this result lags behind the ~ 10 -5 sensitivity inferred for opal sensors exploiting superprism effect [8] and colloidal tunable photonic crystals [22], these approaches require somewhat more complicated optical measurement schemes or sample preparation procedures. Silica inverse opal PhCs described in the present study does not require complicated fabrication procedures or optical measurement schemes, and yet can provide a substantial sensitivity.…”

Section: Discussionmentioning

confidence: 99%

Inverse silica opal photonic crystals for optical sensing applications

Nishijima¹,

Ueno²,

Juodkazis³

et al. 2007

Opt. Express

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This work reports fabrication of inverse silica opal photonic crystal structures from direct polystyrene micro sphere opals using low-temperature sol-gel infiltration of silica, and examines performance of these photonic crystals as environmental refractive index sensors. Sensitivity of the spectral position and optical attenuation of photonic stop gaps is found to allow detection of the index changes by the amount of ~10(-3). The high value of sensitivity, which is comparable with those of other optical sensing techniques, along with simplicity of the optical detection setup required for sensing, and the low-temperature, energy-efficient fabrication process make inverse silica opals attractive systems for optical sensing applications.

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Section: Discussionmentioning

confidence: 99%

Inverse silica opal photonic crystals for optical sensing applications

Nishijima¹,

Ueno²,

Juodkazis³

et al. 2007

Opt. Express

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“…A colloidal crystal formed on a planar substrate usually adapts a face-centered cubic (fcc) structure with the (111) plane parallel to the substrate and interacts strongly with light following Bragg's law: where n eff is the effective refractive index from dielectric mixing, d is the interlayer spacing, n and φ are respectively the refractive index and the volume fraction of each component phase, ψ is the angle between the incident beam and the sample normal, and D is the diameter of the colloidal template. Colloidal crystals have been successfully utilized to template the growth of mesostructured semiconductors, ,, metals, − and various polymers, − including hydrogels. ,− …”

Section: Introductionmentioning

confidence: 99%

Glucose-Sensitive Inverse Opal Hydrogels: Analysis of Optical Diffraction Response

2004

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A glucose-sensitive inverse opal hydrogel was synthesized through photopolymerization of 2-hydroxyethyl methacrylate and 3-acrylamidophenylboronic acid within the interstitial space of a dried poly(styrene) colloidal crystal template, followed by template removal. Charged complex formation between the phenylboronic acid functional group and the 1,2-cis-diol glucose resulted in reversible swelling of the inverse opal hydrogel, which was observed through shifts in the optical diffraction wavelength. The hydrogel was sensitive to glucose at physiological concentrations and ionic strength. The effects of phenylboronic acid concentration, ionic strength, and buffer pH on the equilibrium hydrogel swelling were also studied. The kinetics of hydrogel swelling was also examined, and it was found that the rate of diffraction shift matched well with diffusion-limited kinetics. Additionally, the diffraction response was compared with simulations using the scalar wave approximation and transfer matrix method.

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“…22,23 An early attempt of electrochemical tuning was presented on a sterically packed silica opal infiltrated with a conducting polymer. 24 This latter system exhibited only a modest change in optical properties and did not demonstrate a cyclic response. The current effort presented here focuses on the electrochemical tuning of electrostatically stabilized crystalline colloidal arrays composed of coreshell particles that have been hydrogel-encapsulated and integrated into a self-contained device.…”

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confidence: 95%