Supported sol-gel thin-film glasses embodying laser dyes. 1. A new fast method for the preparation of optically clear polysiloxane thin-film glasses

Haruvy, Y.; Webber, S. E.

doi:10.1021/cm00015a027

Cited by 44 publications

(30 citation statements)

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“…However, silica solgels typically demonstrate cracking upon gelation and/or densification reducing the mechanical and optical qualities of the thin film. Non-cracking organically modified silica sol-gel thin films that were shown to encapsulate organic dyes have been demonstrated by Haruvy and Webber [4]. It is well known that methylene blue, an organic dye molecule, exhibits a reversible colour change upon exposure to oxygen [5] as shown in Figure 1(b).…”

Section: School Of Chemistry University Of Southamptonmentioning

confidence: 86%

An integrated bragg grating oxygen sensor using a hydrophobic sol-gel layer doped with an organic dye

Wales

Parker

Gates

et al. 2011

2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)

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Oxygen sensing is required for the understanding of many chemical processes across a diverse set of fields including medicine, environmental science and chemical synthesis. Oxygen sensing can be achieved through the use of electronic sensors. However, there are limitations associated with electronic sensors including susceptibility to electromagnetic interference and presenting a spark risk in flammable environments. Optical fiber and integrated optical chemical sensors overcome these limitations of electrical based sensing methods.It has been previously shown that a planar optical waveguide containing a Bragg grating is an effective method of detecting minute changes in refractive index [1]. The evanescent field of the optical mode within an unclad waveguide containing a Bragg grating interacts with a chemical analyte. This device works by detecting the associated effective index change when the analyte is altered. The change in effective index of the mode is directly proportional to the Bragg wavelength of the grating. Accurate spectral measurement provides high dynamic range with observable changes in the effective refractive index of 10 -6 . The waveguides are fabricated in a flame hydrolysis deposited layer of germanium doped silica. Simultaneous definition of both a channel waveguide and Bragg gratings can be achieved via a process known as Direct Grating Writing. Reference [2] provides a thorough review on the fabrication and development of UV written planar Bragg grating sensors. This work looks at depositing a porous layer onto the surface of these sensors for oxygen detection, as shown in Figure 1 Silica sol-gels are an inorganic porous matrix of a solid glass-like material [3]. Low temperature hydrolysis of tetraalkoxysilanes forms liquid silica sols which can be spin deposited and densified with heat treatment to form thin film layer/s. Silica sol-gel thin films have been widely utilised in sensing applications. However, silica solgels typically demonstrate cracking upon gelation and/or densification reducing the mechanical and optical qualities of the thin film. Non-cracking organically modified silica sol-gel thin films that were shown to encapsulate organic dyes have been demonstrated by Haruvy and Webber [4]. It is well known that methylene blue, an organic dye molecule, exhibits a reversible colour change upon exposure to oxygen [5] as shown in Figure 1(b). This quantitative change in absorption possesses an associated change in refractive index. We will show that methylene blue can be encapsulated within a porous, hydrophobic, non-cracking silica sol-gel. Spin deposition and heat treatment form a layer of the sol-gel several microns thick onto the integrated device to produce a gaseous oxygen sensor.We shall present our latest work combining engineered oxygen sensitive sol-gels with high sensitivity integrated Bragg sensors for distributed oxygen sensing. References1R.M. Parker, J.C. Gates, M.C. Grossel, P.G.R. Smith, "In vacuo measurement of the sensitivity limit of planar Bragg grating se...

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Section: School Of Chemistry University Of Southamptonmentioning

confidence: 86%

An integrated bragg grating oxygen sensor using a hydrophobic sol-gel layer doped with an organic dye

Wales

Parker

Gates

et al. 2011

2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC)

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“…Sol-gel based composites have found applications in numerous fields such as chemo-and biosensors, 150,151 batteries, 152 solid state catalysts, 153 chromatography, 154 optics 155 and recently in medicine. 156,157 The sol-gel materials can be prepared from tetrahydrolyzed silane precursors Si(OR) 4 or functional trialkoxysilanes R n Si(OH) m (n = 1-3, m = 3-1).…”

Section: (Ii) Non-conducting Polymer Depositsmentioning

confidence: 99%

Electrochemical Coating of Medical Implants

Guslitzer-Okner

Mandler

2011

Modern Aspects of Electrochemistry

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“…18,19,20 Examples of other polymer systems investigated are epoxy resins 21,22,23 , polyurethanesand isocyanurates 24,25,26 , sol-gels (inorganic) and organic-inorganic hybrid polymers. [27][28][29][30][31] The poled plasma polymerization process (P4) technology that polymerizes while poling rather than requiring post polymerization poling. This eliminates a poled state that is different than the as polymerized state.…”

Section: Active Materials and Structuresmentioning

confidence: 99%

Monolithic integration of microelectronics and photonics using molecularly engineered materials

Kubacki

2005

SPIE Proceedings

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The monolithic integration of CMOS microelectronics with photonics is inevitable and benefits both technologies. Photonic integration to microelectronics provides such solutions as overcoming microprocessor communication roadblocks through the use of optical interconnection. Microelectronic integration can provide benefits to photonic structures by optimizing electronic signals generated by photonic biosensors for example. Photonic integration must complement, build on, and enhance the existing state of CMOS microelectronic technology. Photonic approaches that ignore the realities of CMOS architectures (such as power and thermal limitations), provide little benefit to the CMOS device performance, are incompatible with CMOS silicon manufacturing processes, or are incapable of achieving levels of long term reliability already well demonstrated by microelectronic devices, give little reason for photonic/microelectronic integration. Practical implementation of photonics on chip, monolithically with CMOS type microelectronic devices, remains in the laboratory.This work presents architectures to integrate photonics and microelectronics that address CMOS fabrication realities, increase performance of both the electronic and optical functions, and retain current levels of reliability. Fabricating these structures with the limited CMOS material set and/or typical photonic materials requires materials to be molecularly engineered to provide required properties. Materials have been investigated that enable economic fabrication of photonic structures for monolithic integration. Low loss self assembled silicon nanocomposite VIPIR ® waveguide structures are combined with long term stable non-linear poled polymers for fabrication of electro-optic active devices. Materials are fabricated using low temperature plasma enhanced chemical vapor deposition (PECVD).

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Supported sol-gel thin-film glasses embodying laser dyes. 1. A new fast method for the preparation of optically clear polysiloxane thin-film glasses

Cited by 44 publications

References 0 publications

An integrated bragg grating oxygen sensor using a hydrophobic sol-gel layer doped with an organic dye

An integrated bragg grating oxygen sensor using a hydrophobic sol-gel layer doped with an organic dye

Electrochemical Coating of Medical Implants

Monolithic integration of microelectronics and photonics using molecularly engineered materials

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