Photosensitive point defects in optical glasses: Science and applications

Potter, B. G.; Simmons-Potter, K.

doi:10.1016/s0168-583x(99)00864-2

Cited by 21 publications

(13 citation statements)

References 43 publications

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“…21 O efeito fotossensível em vidros germanosilicatos consiste essencialmente na perturbação do índice de refração da ordem de 10 -3 sob irradiação com luz ultravioleta, tipicamente entre 190 e 340 nm. 22 A origem do mecanismo eletrônico responsável do efeito fotossensível foi amplamente investigada após a descoberta de K. O. Hill, mas é ainda controversa devido à complexidade e diversidade dos possíveis mecanismos envolvidos. 22 Entretanto, de maneira geral, acredita-se que a fotossensibilidade dos vidros germanosilicatos com radiação eletromagnética de energia menor que o bandgap típico desses vidros (6-9 eV) é devida à presença de defeitos pontuais na rede vítrea SiO 2 -GeO 2 .…”

Section: Figura 2 Imagens Do Vidro Fotossensível Com As Partes Escurunclassified

“…22 A origem do mecanismo eletrônico responsável do efeito fotossensível foi amplamente investigada após a descoberta de K. O. Hill, mas é ainda controversa devido à complexidade e diversidade dos possíveis mecanismos envolvidos. 22 Entretanto, de maneira geral, acredita-se que a fotossensibilidade dos vidros germanosilicatos com radiação eletromagnética de energia menor que o bandgap típico desses vidros (6-9 eV) é devida à presença de defeitos pontuais na rede vítrea SiO 2 -GeO 2 . O modelo mais amplamente aceito é baseado na presença de defeitos pontuais devido às vacâncias de oxigênios ao redor do germânio e também devido às vacâncias de germânio, resultando em níveis eletrônicos dentro do bandgap do material entre 5 e 6 eV.…”

Section: Figura 2 Imagens Do Vidro Fotossensível Com As Partes Escurunclassified

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Glassy Materials and Light: Part 1

et al. 2016

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publicado na web em 05/02/2016 GLASSY MATERIALS AND LIGHT: PART 1. 2015 is the Year of Light, according to UNESCO. Chemistry has a close relationship with light and one of the materials that allows such synergy is glass. Depending on the chemical composition of the glass, it is possible to achieve technological applications for the whole range of wavelengths extending from the region of the microwave to gamma rays. This diversity of applications opens a large range of research where chemistry, as a central science, overlaps the fields of physics, engineering, medicine, etc., generating a huge amount of knowledge and technological products used for humanity. This review article aimed at discussing some families of glasses, illustrating some applications. Due to the extension of the theme, and all points raised, we thought it would be good to divide the article into two parts. In the first part we focus on the properties of heavy metal oxide glasses, fluoride glasses and chalcogenide glasses. In the second part we emphasize the properties of glassy thin films prepared by sol-gel methodology and some applications, of both glasses as the films in photonics, and more attention was given to the nonlinear properties and uses of photonic fibers.

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Glassy Materials and Light: Part 1

et al. 2016

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“…Then the GeB co-doped PSF's attenuation @630nm is muchhigher than the high Ge dope PSF's. This means the Boron dope into the fiber increase the Si-O defect content then increase the fiber's photosensitivity [10].…”

Section: Table 1 the Data Compare Between High Ge Doped Psf And Geb mentioning

confidence: 99%

Study of doping process influence the fiber's photosensitivity

Tian

Luo

Wang

et al. 2009

2009 14th OptoElectronics and Communications Conference

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This study indicate that the Fluorine doped would influence the fiber's photosensitivity. The Boron doped would increase it distinctly when the dope content reach 5%. Then it would get the saturation on about 30%. Introduction The discovery of photoinduced, refractive index grating formation within the Ge-doped core of a silica optical fiber by Hill et al. [1] in 1978 which began an intense period of research activity in the area of photosensitive defects in optical fiber. Fiber gratings written into photosensitive fiber by UV holographic techniques are attracting considerable attention due to their broad range of potential application in photonic devices and optical communications such as dispersion compensation, and sensors [2]. Photosensitive fibers are based material for writing optical fiber grating. Germanosilicate glass fibers have a well known photoinduced refractive index change initiated by UV light at wavelengths near 240nm and this phenomenon has been used to form reflection gratings at telecommunication wavelengths [3]. Based on the PCVD process, the fiber's refractive index profile and the doping content can be controlled accurately. In fiber making process, the Ge,B and F are doped into the fiber. The absorption band located near 242 nm [4] is connected to defect centers in the germanosilicate matrix. The fiber's attenuation @630nm could be used to speculate the fiber's defect content. Change the fiber's doping content, the fiber's photosensitivity could be changed obviously.

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“…For example, photosensitive Bragg gratings, written directly into the core of optical fiber, are now a widely established technology with broad impact in telecommunications and active photonic systems [1]. More recently, photosensitive materials strategies have been applied in planar architectures for integrated photonic systems [2][3][4]. In both cases, a fundamental understanding of the photophysics involved, coupled with advances in materials selection and processing, is necessary to optimize the photoinduced refractive index change attained and the subsequent optical performance of these devices.…”

Section: Introductionmentioning

confidence: 99%

Photoprogrammable molecular hybrid materials for write-as-needed optical devices

Potter

Simmons-Potter

Chandra

et al. 2006

Journal of Non-Crystalline Solids

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The application of photosensitive materials to provide immediately configurable optical device functionality in integrated photonic systems has motivated an examination of the unique materials requirements associated with this alternative operational mode. In this case, a reliable photoinduced index change is needed when photopatterning under non-laboratory conditions utilizing compact, integrable optical sources. Molecular hybrid thin films, based on inorganic, Group IVA linear-chain polymers, are investigated in terms of excitation (writing) wavelength tuning through molecular modification and the influence of environmental conditions and thermal history on the photosensitive response observed. In general, a significant photoinduced refractive index change (with magnitude greater than 10 À2 at 632.8 nm) is found to be retained as the lowest energy absorption band (associated with the Group IVA conjugated backbone structure) is shifted with changes in side-group identity and backbone composition. In addition, the photosensitive response of a representative polysilane composition (poly[(methyl)(phenyl)silylene]) is observed to be strongly dependent on the local atmospheric composition during photoexposure, a key issue in the effective in-situ patterning of optical structures.

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Photosensitive point defects in optical glasses: Science and applications

Cited by 21 publications

References 43 publications

Glassy Materials and Light: Part 1

Glassy Materials and Light: Part 1

Study of doping process influence the fiber's photosensitivity

Photoprogrammable molecular hybrid materials for write-as-needed optical devices

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