Near-infrared high refractive-index three-dimensional inverse woodpile photonic crystals generated by a sol-gel process

2007 ◽  
Vol 102 (9) ◽  
pp. 096102 ◽  
Author(s):  
Baohua Jia ◽  
Shuhui Wu ◽  
Jiafang Li ◽  
Min Gu
Keyword(s):  
Refractive Index ◽  
Photonic Crystals ◽  
Near Infrared ◽  
Sol Gel ◽  
Three Dimensional ◽  
High Refractive Index ◽  
Sol Gel Process

A facile method for fabrication of titanium-doped hybrid materials with high refractive index

RSC Advances ◽  
2014 ◽  
Vol 4 (27) ◽  
pp. 13909-13918 ◽  
Author(s):  
Xibing Zhan ◽  
Qingyu Xing ◽  
Huijuan Liu ◽  
Junying Zhang ◽  
Jue Cheng ◽  
...  
Keyword(s):  
Refractive Index ◽  
Hybrid Materials ◽  
Sol Gel ◽  
High Refractive Index ◽  
Sol Gel Process ◽  
Facile Route

This paper presents a facile route to prepare a series of high refractive index and homogeneous hybrid resins with titanium in the backbone by a non-hydrolytic sol–gel process.

Anti-reflection and anti-static (AR/AS) coatings made by TiO2 sol-gel process with poly(3,4-ethylenedioxy thiophene)

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Won Jung Kim ◽  
Tae Young Kim ◽  
Chin Su Park ◽  
Jong Eun Kim ◽  
Tae Hee Lee ◽  
...  
Keyword(s):  
Refractive Index ◽  
Sol Gel ◽  
Nir Spectroscopy ◽  
High Refractive Index ◽  
Conducting Layer ◽  
Uv Curable ◽  
Sol Gel Process ◽  
Refractive Index Layer ◽  
Poly Ethylene ◽  
Low Refractive Index

AbstractIn this study, we designed a two-layer hybrid Anti-Reflection/Anti-Static (AR/AS) thin film. Two kinds of UV-curable fluorinated compounds were synthesized as low refractive index materials, and a TiO2 sol combined with a conducting polymer, poly(3,4-ethylenedioxythiophene) was made by the sol-gel process for use as a high refractive index material as well as a conducting layer. In order to determine the most optimized AR/AS system, the spectral properties were simulated with the refractive index of each layer. According to the simulated results, a high refractive index layer was deposited on the hard coated poly(ethylene terephthalate) (PET) substrate by the spin coating technique, and a low refractive index layer was spin coated on the low refractive index layer. The reflectance and transmittance were measured by UV-VIS-NIR spectroscopy. It was found that the measured reflectance and the maximum transmittance of the AR/AS film were 0.71 %R at a wavelength of 550 nm and 93 %T in the wavelength range between 400 and 700 nm, respectively. The surface resistance of the AR/AS film was 108.6 ohms.

scholarly journals Mode Sensitivity Exploration of Silica–Titania Waveguide for Refractive Index Sensing Applications

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7452
Author(s):  
Muhammad A. Butt ◽  
Andrzej Kaźmierczak ◽  
Cuma Tyszkiewicz ◽  
Paweł Karasiński ◽  
Ryszard Piramidowicz
Keyword(s):  
Refractive Index ◽  
High Performance ◽  
Near Infrared ◽  
Sol Gel ◽  
Cost Effective ◽  
Dip Coating ◽  
Infrared Wavelength ◽  
Refractive Index Sensing ◽  
Sensing Applications ◽  
Coating Method

In this paper, a novel and cost-effective photonic platform based on silica–titania material is discussed. The silica–titania thin films were grown utilizing the sol–gel dip-coating method and characterized with the help of the prism-insertion technique. Afterwards, the mode sensitivity analysis of the silica–titania ridge waveguide is investigated via the finite element method. Silica–titania waveguide systems are highly attractive due to their ease of development, low fabrication cost, low propagation losses and operation in both visible and near-infrared wavelength ranges. Finally, a ring resonator (RR) sensor device was modelled for refractive index sensing applications, offering a sensitivity of 230 nm/RIU, a figure of merit (FOM) of 418.2 RIU−1, and Q-factor of 2247.5 at the improved geometric parameters. We believe that the abovementioned integrated photonics platform is highly suitable for high-performance and economically reasonable optical sensing devices.

Nanocopying as a Means of 3D Nanofabrication: Scope and Prospects

2003 ◽  
Vol 56 (10) ◽  
pp. 1001 ◽  
Author(s):  
Toyoki Kunitake ◽  
Shigenori Fujikawa
Keyword(s):  
Sol Gel ◽  
Three Dimensional ◽  
Advantages And Disadvantages ◽  
Sol Gel Process ◽  
Nanometer Regime

The use of nanosized templates to fabricate three-dimensional architectures in the nanometer regime is still a largely unexplored field of nanotechnology. Positive and negative copying of molecules and nano-sized objects by the surface sol–gel process is useful for this purpose. The authors here give account of the techniques available to date, along with their advantages and disadvantages, is outlined.

scholarly journals Anodic Alumina Photonic Crystals as Refractive Index Sensors for Controlling the Composition of Liquid Mixtures

2019 ◽  
Vol 10 (2) ◽  
pp. 147-154 ◽  
Author(s):  
Matin Ashurov ◽  
Vladimir Gorelik ◽  
Kirill Napolskii ◽  
Sergey Klimonsky
Keyword(s):  
Refractive Index ◽  
Photonic Crystals ◽  
Stop Band ◽  
Analytical Signal ◽  
Liquid Mixtures ◽  
High Refractive Index ◽  
Anodic Alumina ◽  
Refractive Index Sensitivity ◽  
Water Glycerol ◽  
Refractive Index Sensors

Abstract Photonic crystals based on anodic aluminum oxide films are examined as refractive index sensors for controlling the composition of water-alcohol liquid mixtures. The position of the reflectance maximum corresponding to the first photonic stop band is used as the analytical signal. Impregnation of a photonic crystal with water-ethanol and water-glycerol mixtures results in a redshift of the reflectance maximum. A fairly high refractive index sensitivity, sufficient to determine the composition of water-ethanol and water-glycerol mixtures with an accuracy of about 1 wt.%, is observed. The detailed dependencies of the analytical signal on the composition of mixtures are experimentally investigated and compared with numerical calculations. Prospects and limitations of the refractive index sensors based on anodic alumina photonic crystals are discussed.

scholarly journals Sodium Alginate Cross-Linkable Planar 1D Photonic Crystals as a Promising Tool for Pb2+ Detection in Water

Chemosensors ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 37 ◽  
Author(s):  
Andrea Dodero ◽  
Paola Lova ◽  
Silvia Vicini ◽  
Maila Castellano ◽  
Davide Comoretto
Keyword(s):  
Refractive Index ◽  
Photonic Crystals ◽  
Sodium Alginate ◽  
Spectral Response ◽  
High Refractive Index ◽  
Polluted Water ◽  
Ionic Exchange ◽  
Promising Tool ◽  
Rural Environments ◽  
First Time

Due to its high toxicity, Pb2+ pollution is a serious threat for human health and environments. However, in situ real-time detection of Pb2+ pollution is difficult and laboratory instruments are usually required. Then, the possibility to monitor water quality without laboratory instruments could lead to the extensive assessment of polluted water sources, especially in rural environments and developing countries where large lead concentrations are often found in surface water. Consequently, new simple colorimetric sensors are highly interesting in the field. In this work we report for the first time disposable polymer planar 1D photonic crystals made of poly (N-vinylcarbazole) as high refractive index medium and sodium alginate as low refractive index and active medium for the detection of Pb2+ in water. The detection relies on the ionic exchange occurring into the alginate matrix. This process effectively induces a physical cross-linking phenomenon, which inhibits water solubilization of the polymer. In turn, this affects the spectral response of the planar 1D photonic crystals modifying its color.

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