An alternative method to obtain direct opal photonic crystal structures

Chiappini, Andrea; Armellini, Cristina; Chiasera, Alessandro; Ferrari, M.; Fortes, L.M.; Gonçalves, M. Clara; Guider, R.; Jestin, Y.; Retoux, R.; Conti, G. Nunzi; Pelli, S.; Almeida, Rui M.; Righini, Giancarlo C.

doi:10.1016/j.jnoncrysol.2009.01.054

Cited by 40 publications

(26 citation statements)

References 26 publications

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“…Furthermore, n titania is the refractive index of titania, n ethanol is the refractive index of different ethanol concentrations, and f is the packing factor (=0.74) of the crystal structure, the results indicate that the structure is a well-ordered 3D face centered cubic order structure [10]. From the work of Zheng's group described in [3], the TiO 2 pore size is 210 nm and the incident angle is 90˝; however, in our work, the TiO 2 pore size is 200 nm, and the incident angle is 20˝.…”

Section: Ethanol Concentration Examined By Ps Opal and Tio 2 Inverse mentioning

confidence: 94%

“…This value is smaller than the diameter of the synthesized PS microspheres (244 nm) used to form the template, which demonstrates that shrinkage occurs during the sintering process. This fact is not surprising given that the PS microspheres are mesoporous and, in the early stages of sintering, probably decrease in size as water vapor is released from the pores [10].…”

Section: Characterization Of the Ps Opal And Tio2 Inverse Opal Structmentioning

confidence: 97%

“…Chiappini et al [10] prepared a large well-ordered polystyrene crystal opal by spin-coating technique in 2009. The effective refractive index and the diameter of the colloid spheres can be estimated from the reflectance measurements at different angles.…”

Section: Introductionmentioning

confidence: 99%

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Photonic Crystal-Based Sensors for Detecting Alcohol Concentration

et al. 2016

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Polystyrene (PS) opal and titania (TiO 2 ) inverse opal films were fabricated by the self-assembly colloidal crystal template technique. Based on Bragg's law, these sensors were used to detect the different concentrations of ethanol solution. The results indicated that TiO 2 inverse opal films were advantageous over PS opal film for detecting the ethanol concentration. TiO 2 inverse opal films sintered at 600˝C retained the highest sensitivity for ethanol concentration identification, since the anatase phase was transformed into the rutile phase, which resulted in an enhancement of the refractive index, i.e., an increase in the amount of the red shift.

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Section: Ethanol Concentration Examined By Ps Opal and Tio 2 Inverse mentioning

confidence: 94%

Section: Characterization Of the Ps Opal And Tio2 Inverse Opal Structmentioning

confidence: 97%

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Photonic Crystal-Based Sensors for Detecting Alcohol Concentration

et al. 2016

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“…Most of these structures have been fabricated spin coating processes. [24][25][26] More recently, gas phase fabrication of p1DPC was demonstrated via glancing angle deposition (GLAD), 27, 28 a PVD technique that allows engineering of different films architectures by exploiting ballistic atomic shadowing of vapor atoms at highly oblique deposition angles. Precise control over individual layer RI and thickness and access to different materials are main advantages of GLAD.…”

mentioning

confidence: 99%

Self-Assembled Hierarchical Nanostructures for High-Efficiency Porous Photonic Crystals

et al. 2014

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The nanoscale modulation of material properties such as porosity and morphology is used in the natural world to mold the flow of light and to obtain structural colors. The ability to mimic these strategies while adding technological functionality has the potential to open up a broad array of applications. Porous photonic crystals are one such technological candidate, but have typically underachieved in terms of available materials, structural and optical quality, compatibility with different substrates (e.g., silicon, flexible organics), and scalability. We report here an alternative fabrication method based on the bottom-up self-assembly of elementary building blocks from the gas phase into high surface area photonic hierarchical nanostructures at room temperature. Periodic refractive index modulation is achieved by stacking layers with different nanoarchitectures. High-efficiency porous Bragg reflectors are successfully fabricated with sub-micrometer thick films on glass, silicon, and flexible substrates. High diffraction efficiency broadband mirrors (R≈1), opto-fluidic switches, and arrays of photonic crystal pixels with size<10 μm are demonstrated. Possible applications in filtering, sensing, electro-optical modulation, solar cells, and photocatalysis are envisioned.

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“…Subsequently, the silica suspensions are centrifuged at 3000 rpm for 30 min and washed with water. The centrifuging/washing procedure is repeated six times and finally the particles are dried at 50°C overnight.Latex spheres are synthesized according to a single-stage polymerization process based on formation and growth of polymeric nuclei dispersed in an emulsion constituted by water, styrene, potassium persulfate (KPS) and sodium dodecyl sulfate (SdS) [30,31].…”

Section: Preparation Of Silica and Polystyrene Nanoparticlesmentioning

confidence: 99%

Hybrid colloidal crystal for photonic application

Chiappini¹,

Armellini²,

Bazzanella

et al. 2011

Integrated Photonics: Materials, Devices, and Applications

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We report on the fabrication and characterization of opal-based photonic crystal heterostructures. These heterostructures are created by using multilayer deposition of silica and polystyrene spheres. In the specific the fabricated structures involved both different lattice constant and dielectric function. Scanning electron microscopy (SEM) and NIR-VIS transmittance and reflectance spectroscopy are used to characterize the systems. The SEM images show good ordering of the two-layer colloidal crystals constituting the heterostructures. The transmittance and reflectance spectra measured from the (111) plane of the heterostructure show that the composite colloidal photonic crystals have double photonic stop bands that matches the stop bands of the individual photonic crystals. This behaviour can be seen as a superposition of the properties of each individual layer.

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An alternative method to obtain direct opal photonic crystal structures

Cited by 40 publications

References 26 publications

Photonic Crystal-Based Sensors for Detecting Alcohol Concentration

Photonic Crystal-Based Sensors for Detecting Alcohol Concentration

Self-Assembled Hierarchical Nanostructures for High-Efficiency Porous Photonic Crystals

Hybrid colloidal crystal for photonic application

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