scholarly journals Preparation of ultra-broadband antireflective coatings for amplifier blast shields by a sol–gel method

2017 ◽  
Vol 5 ◽  
Author(s):  
Huai Xiong ◽  
Bin Shen ◽  
Zhiya Chen ◽  
Xu Zhang ◽  
Haiyuan Li ◽  
...  
Keyword(s):  
Refractive Index ◽  
Sol Gel ◽  
High Refractive Index ◽  
Dip Coating ◽  
Scratch Resistance ◽  
Fused Silica ◽  
Antireflective Coating ◽  
Antireflective Coatings ◽  
Average Residual ◽  
Low Refractive Index

A type of $\unicode[STIX]{x1D706}/4$–$\unicode[STIX]{x1D706}/4$ ultra-broadband antireflective coating has been developed using modified low refractive silica and high refractive silica layers by a sol–gel dip coating method for amplifier blast shields of the Shen Guang II high power laser facility (SG-II facility). Deposition of the first layer (high refractive index silica) involves baking at $200\,^{\circ }\text{C}$ in the post-treatment step. The second layer (low refractive index, $n=1.20$) uses low refractive index silica sol modified by acid catalysis. Thermal baking at temperatures no less than $500\,^{\circ }\text{C}$ for 60 min offers chemical stability, ethanol scratch resistance, and resistance to washing with water. The average residual reflection of dual-side-coated fused silica glass was less than 1% in the spectral range from 450 to 950 nm. Transmission gain has been evaluated by taking into account angular light, and the results show that the transmission gain increases with increasing light incidence. Even at $60^{\circ }$, the transmission spectrum of the broadband antireflective coating effectively covered the main absorption peak of Nd:glass.

Quantum State in Fabricating Silica Antireflective Coatings

2012 ◽  
Vol 271-272 ◽  
pp. 247-250
Author(s):  
Rui Min Jin ◽  
Zhi Duan Cai ◽  
Li Min Cang ◽  
Tao Yan
Keyword(s):  
Refractive Index ◽  
Quantum State ◽  
Glass Substrate ◽  
Sol Gel ◽  
Sio2 Film ◽  
Quantum States ◽  
Antireflective Coating ◽  
Antireflective Coatings ◽  
Coating Films ◽  
Sol Gel Process

Based on TEOS system and sol-gel process, together with catalysts, Antireflective coating films prepared by sol—gel on glass substrate have been processed by rapid thermal annealing (RTA). the refractive index and thinkness of SiO2 film is exactly controlled. The films are characterized by ellipsometer and SEM respectively. The quantum states in these processions are found and discussed.

scholarly journals Highly Sensitive Sensor Structure Based on Sol-Gel Waveguide Films and Grating Couplers

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1389
Author(s):  
Paweł Karasiński ◽  
Andrzej Kaźmierczak ◽  
Magdalena Zięba ◽  
Cuma Tyszkiewicz ◽  
Katarzyna Wojtasik ◽  
...  
Keyword(s):  
Refractive Index ◽  
Theoretical Analysis ◽  
Sol Gel ◽  
High Refractive Index ◽  
Dip Coating ◽  
Optical Quality ◽  
Single Step ◽  
High Optical Quality ◽  
Grating Couplers ◽  
Sensor Structure

The technologies of optical planar evanescent wave chemical and biochemical sensors require chemically resistant, high refractive index waveguide films having very good optical transmission properties. In this paper we present such two-compound SiOx:TiOy waveguide films fabricated by using the sol-gel method and the dip-coating technique. These films not only have high optical quality and low propagation losses but also an extremely high refractive index of >1.90 (λ = 632.8 nm). Further we demonstrate efficient and simple sensing structures, designed and fabricated based on these films. For this purpose, grating couplers with a period of Λ = 417 nm were fabricated on the interface between a waveguide film and cover using the single-step nanoimprint method. These sensing structures were tested as planar refractometers. The results of the theoretical analysis on the basis of which the structures were designed as well as results of their experimental characterization are presented in this work. Consequently, the relationship between parameters and the sensitivity of investigated sensing structures is discussed. As a result, the profitable properties of the designed grating coupler sensors are verified and excellent consistency between the results of the theoretical analysis and experimental results is achieved.

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.

Study on low-refractive-index sol-gel SiO2 antireflective coatings

2016 ◽  
Vol 14 (8) ◽  
pp. 083101-83103 ◽  
Author(s):  
Bin Shen Bin Shen ◽  
Haiyuan Li Haiyuan Li ◽  
Huai Xiong Huai Xiong ◽  
Xu Zhang Xu Zhang ◽  
and Yongxing Tang and Yongxing Tang
Keyword(s):  
Refractive Index ◽  
Sol Gel ◽  
Antireflective Coatings ◽  
Low Refractive Index

scholarly journals One-step fabrication of high refractive index inorganic nanostructures

2021 ◽  
Author(s):  
E. Zanchetta ◽  
G. Della Giustina ◽  
A. Gandin ◽  
V. Auzelyte ◽  
G. Brusatin
Keyword(s):  
Refractive Index ◽  
Nanoimprint Lithography ◽  
Low Cost ◽  
Sol Gel ◽  
Uv Curing ◽  
High Refractive Index ◽  
Planar Waveguides ◽  
Ex Situ ◽  
Antireflective Coatings

AbstractDirect printing of spin-on functional films is probably the most efficient method to develop low-cost novel photonic nanodevices, such as diffraction gratings, planar waveguides, nano- lasers, and antireflective coatings. For these applications high refractive index transparent materials are demanded; however, this class of materials generally requires inorganic oxides, well known for their hardness, typical of ceramic materials, and so incompatible with a soft character of printable resins. Herein, inorganic high refractive index TiO2 micro- and nano- structures, with unusual depth up to 600 nm and aspect ratio larger than 5, are obtained by combining thermal nanoimprint lithography (NIL) with UV curing. To achieve printed patterns, a hybrid organic-inorganic spin-on film is deposited at low-temperature by sol–gel processing. Two distinct bottom-up synthetic approaches are used, called in situ and ex situ, using titanium isopropoxide (90%) or TiO2 anatase nanoparticles (70%), respectively, and adding a silica sol modified by organic moieties. The two syntheses were optimized to obtain, after patterning by thermal imprint, amorphous or crystalline titania crack-free micro- and nano- patterns for in situ and ex situ, respectively. The further UV irradiation converts imprinted films to totally inorganic patterns, through the titania photocatalytic effect, allowing refractive indexes up to 1.82 at 632 nm to be achieved. This novel strategy of combining thermal imprint with UV exposure allows inorganic deep patterns to be fabricated without a calcination step, which is generally needed for inorganic resists processing. Eventually, a thermal treatment only at 300 °C can be applied to achieve a final refractive index of 2 at 632 nm.

Sol–Gel Preparation of Hydrophobic Silica Antireflective Coatings with Low Refractive Index by Base/Acid Two-Step Catalysis

2014 ◽  
Vol 6 (14) ◽  
pp. 11470-11475 ◽  
Author(s):  
Shuang Cai ◽  
Yulu Zhang ◽  
Hongli Zhang ◽  
Hongwei Yan ◽  
Haibing Lv ◽  
...  
Keyword(s):  
Refractive Index ◽  
Sol Gel ◽  
Antireflective Coatings ◽  
Hydrophobic Silica ◽  
Gel Preparation ◽  
Low Refractive Index

Effect of Different Temperatures on Fabricating Silica Antireflective Coatings

2012 ◽  
Vol 271-272 ◽  
pp. 251-254
Author(s):  
Li Na Zhang ◽  
Rui Min Jin
Keyword(s):  
Refractive Index ◽  
Thermal Annealing ◽  
Glass Substrate ◽  
Sol Gel ◽  
Sio2 Film ◽  
Antireflective Coating ◽  
Antireflective Coatings ◽  
Coating Films ◽  
Sol Gel Process ◽  
Different Temperatures

Based on TEOS system and sol-gel process, together with catalysts, Antireflective coating films prepared by sol—gel on glass substrate have been processed by furnace thermal annealing (FA). the refractive index and thinkness of SiO2 film is exactly controlled. The films are characterized by ellipsometer and SEM respectively. The effect of different temperatures in these processions are found and discussed

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.

Waveguide Capillary Cell for Low-Refractive-Index Liquids

1997 ◽  
Vol 51 (10) ◽  
pp. 1554-1558 ◽  
Author(s):  
Robert Altkorn ◽  
Ilia Koev ◽  
Amos Gottlieb
Keyword(s):  
Refractive Index ◽  
Thin Layer ◽  
Reflection Loss ◽  
Total Internal Reflection ◽  
Visible Region ◽  
Fused Silica ◽  
Internal Reflection ◽  
Silica Tube ◽  
Transparent Liquid ◽  
Low Refractive Index

We describe a waveguide capillary cell based on a fused-silica tube coated externally with a thin layer of a low-refractive-index ( n = 1.31) fluoropolymer. When filled with a transparent liquid of refractive index greater than that of the fluoropolymer, the cell is capable of transmitting light through total internal reflection. Loss below 1 dB/m is demonstrated throughout much of the visible region for a 530-μm-i.d., 660-μm-o.d. cell filled with water.

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