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Skuja L, Leimane M, Ollier N, Grishchenko A. Paramagnetic Point Defect in Fluorine-Doped Silica Glass: The E^{'}(F) Center. PHYSICAL REVIEW LETTERS 2023; 131:256903. [PMID: 38181348 DOI: 10.1103/physrevlett.131.256903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 11/22/2023] [Indexed: 01/07/2024]
Abstract
Fluorine-doped silica is a key material used in all low-loss and/or radiation-resistant optical fibers. Surprisingly, no fluorine-related radiation-induced point defects have been identified. By using electron paramagnetic resonance, we report the first observation of F-related defects in silica. Their fingerprint is a doublet with 10.5 mT splitting due to hyperfine coupling (hfc) to ^{19}F nuclear spins. An additional 44.4 mT hfc to the ^{29}Si nucleus indicates that this defect belongs to the "E^{'} center" family and has a structure of a fluorine-modified Si dangling bond: 3-coordinated Si atoms with an unpaired electron in an sp^{3} orbital, bonded to a glass network by 2 bridging oxygen atoms and to a F atom.
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Affiliation(s)
- Linards Skuja
- Institute of Solid State Physics, University of Latvia, Riga LV1063, Latvia
| | - Madara Leimane
- Institute of Solid State Physics, University of Latvia, Riga LV1063, Latvia
| | - Nadège Ollier
- Laboratoire des Solides Irradiés (LSI) Ecole Polytechnique, CNRS, CEA\DRF\IRAMIS, Institut Polytechnique de Paris, 91128 PALAISEAU cedex, France
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Jiao Y, Yang Q, Zhu Y, Wang F, Zhang L, Wang M, Wang S, Shao C, Yu C, Hu L. Improved radiation resistance of an Er-doped silica fiber by a preform pretreatment method. OPTICS EXPRESS 2022; 30:6236-6247. [PMID: 35209563 DOI: 10.1364/oe.450445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 01/27/2022] [Indexed: 06/14/2023]
Abstract
We report a novel pretreatment method to improve the radiation resistance of Er-doped fiber (EDF). The processing object of this method is EDF preform, and the pretreatment processing involves three steps: deuterium loading, pre-irradiation, and thermal annealing. The effects of pretreatment conditions on the optical loss, gain performance, and radiation resistance of EDF were systematically studied. The relevant mechanisms were revealed using Fourier transform infrared (FTIR), radiation-induced absorption (RIA), and electron paramagnetic resonance (EPR) spectroscopies. The results show that the pretreatment can not only greatly reduce the hydroxyl content of the EDF core, but it can also effectively improve the radiation resistance of EDF. The online test results show that the gain of the commercial, pristine, and pretreated EDFs were reduced by 19.0, 4.2, and 1.3 dB, respectively, corresponding to a decrease of 68.1, 16.2, and 4.7% after 98 krad X-rays irradiation. The high vacuum experiments show that the pretreatment method can maintain long-term stable high radiation resistance. This work provides a reference for the development of high-performance radiation resistant EDFs for use in the lower, middle, and geosynchronous earth orbit.
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Lo Piccolo GM, Cannas M, Agnello S. Intrinsic Point Defects in Silica for Fiber Optics Applications. MATERIALS (BASEL, SWITZERLAND) 2021; 14:7682. [PMID: 34947277 PMCID: PMC8703837 DOI: 10.3390/ma14247682] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Revised: 12/03/2021] [Accepted: 12/08/2021] [Indexed: 01/22/2023]
Abstract
Due to its unique properties, amorphous silicon dioxide (a-SiO2) or silica is a key material in many technological fields, such as high-power laser systems, telecommunications, and fiber optics. In recent years, major efforts have been made in the development of highly transparent glasses, able to resist ionizing and non-ionizing radiation. However the widespread application of many silica-based technologies, particularly silica optical fibers, is still limited by the radiation-induced formation of point defects, which decrease their durability and transmission efficiency. Although this aspect has been widely investigated, the optical properties of certain defects and the correlation between their formation dynamics and the structure of the pristine glass remains an open issue. For this reason, it is of paramount importance to gain a deeper understanding of the structure-reactivity relationship in a-SiO2 for the prediction of the optical properties of a glass based on its manufacturing parameters, and the realization of more efficient devices. To this end, we here report on the state of the most important intrinsic point defects in pure silica, with a particular emphasis on their main spectroscopic features, their atomic structure, and the effects of their presence on the transmission properties of optical fibers.
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Affiliation(s)
- Giuseppe Mattia Lo Piccolo
- Dipartimento di Fisica e Chimica, Università Degli Studi di Palermo, Via Archirafi 36, 90123 Palermo, Italy;
- Dipartimento di Fisica e Astronomia, Università Degli Studi di Catania, Via Santa Sofia 64, 95123 Catania, Italy
| | - Marco Cannas
- Dipartimento di Fisica e Chimica, Università Degli Studi di Palermo, Via Archirafi 36, 90123 Palermo, Italy;
| | - Simonpietro Agnello
- Dipartimento di Fisica e Chimica, Università Degli Studi di Palermo, Via Archirafi 36, 90123 Palermo, Italy;
- ATeN Center, Università Degli Studi di Palermo, Viale delle Scienze Ed. 18, 90128 Palermo, Italy
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4
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Yang L, Vajente G, Fazio M, Ananyeva A, Billingsley G, Markosyan A, Bassiri R, Prasai K, Fejer MM, Chicoine M, Schiettekatte F, Menoni CS. Enhanced medium-range order in vapor-deposited germania glasses at elevated temperatures. SCIENCE ADVANCES 2021; 7:eabh1117. [PMID: 34516775 PMCID: PMC8442899 DOI: 10.1126/sciadv.abh1117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Accepted: 07/21/2021] [Indexed: 06/13/2023]
Abstract
Glasses are nonequilibrium solids with properties highly dependent on their method of preparation. In vapor-deposited molecular glasses, structural organization could be readily tuned with deposition rate and substrate temperature. Here, we show that the atomic arrangement of strong network-forming GeO2 glass is modified at medium range (<2 nm) through vapor deposition at elevated temperatures. Raman spectral signatures distinctively show that the population of six-membered GeO4 rings increases at elevated substrate temperatures. Deposition near the glass transition temperature is more efficient than postgrowth annealing in modifying atomic structure at medium range. The enhanced medium-range organization correlates with reduction of the room temperature internal friction. Identifying the microscopic origin of room temperature internal friction in amorphous oxides is paramount to design the next-generation interference coatings for mirrors of the end test masses of gravitational wave interferometers, in which the room temperature internal friction is a main source of noise limiting their sensitivity.
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Affiliation(s)
- Le Yang
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA
| | - Gabriele Vajente
- LIGO Laboratory, California Institute of Technology, Pasadena, CA 91125, USA
| | - Mariana Fazio
- Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, CO 80523, USA
| | - Alena Ananyeva
- LIGO Laboratory, California Institute of Technology, Pasadena, CA 91125, USA
| | | | - Ashot Markosyan
- Edward L. Ginzton Laboratory, Stanford University, Stanford, CA 94305, USA
| | - Riccardo Bassiri
- Edward L. Ginzton Laboratory, Stanford University, Stanford, CA 94305, USA
| | - Kiran Prasai
- Edward L. Ginzton Laboratory, Stanford University, Stanford, CA 94305, USA
| | - Martin M. Fejer
- Edward L. Ginzton Laboratory, Stanford University, Stanford, CA 94305, USA
| | - Martin Chicoine
- Départment de Physique, Université de Montréal, Québec H3C 3J7, Canada
| | | | - Carmen S. Menoni
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA
- Department of Electrical and Computer Engineering, Colorado State University, Fort Collins, CO 80523, USA
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Surface molecular structure defects and laser-induced damage threshold of fused silica during a manufacturing process. Sci Rep 2017; 7:17870. [PMID: 29259296 PMCID: PMC5736750 DOI: 10.1038/s41598-017-18249-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Accepted: 12/07/2017] [Indexed: 11/13/2022] Open
Abstract
Laser induced damage of fused silica is a serious problem for high power laser systems, and damage precursors are mainly induced by manufacturing processes. In this work, fused silica samples were prepared from a manufacturing process including grinding, polishing and etching procedures. The chemical disorder of the prepared samples was inspected by using fluorescence microscopy and ultra-violet fluorescence spectrometer. The physical disorder was characterized by using Infrared and Raman spectrometer. Laser induced damage thresholds (LIDTs) were measured in R-on-1 mode by 355 nm 6.4 ns laser pulse. Results showed that with the manufacturing processes transforming from grinding to etching, the magnitude of fluorescence point defects reduced while their types did not change, the Si-O-Si bonds of prepared samples were strained and the strained bonds were mitigated. The LIDTs increased with the reducing of fluorescence defects and strained Si-O-Si bonds. However, these structural defects can not be eliminated by the current manufacturing process. Improvements may be needed to eliminate the structural defects for a higher LIDT of fused silica.
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Hari Babu B, Lancry M, Ollier N, El Hamzaoui H, Bouazaoui M, Poumellec B. Radiation hardening of sol gel-derived silica fiber preforms through fictive temperature reduction. APPLIED OPTICS 2016; 55:7455-7461. [PMID: 27661569 DOI: 10.1364/ao.55.007455] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The impact of fictive temperature (Tf) on the evolution of point defects and optical attenuation in non-doped and Er3+-doped sol-gel silica glasses was studied and compared to Suprasil F300 and Infrasil 301 glasses before and after γ-irradiation. To this aim, sol-gel optical fiber preforms have been fabricated by the densification of erbium salt-soaked nanoporous silica xerogels through the polymeric sol-gel technique. These γ-irradiated fiber preforms have been characterized by FTIR, UV-vis-NIR absorption spectroscopy, electron paramagnetic resonance, and photoluminescence measurements. We showed that a decrease in the glass fictive temperature leads to a decrease in the glass disorder and strained bonds. This mainly results in a lower defect generation rate and thus less radiation-induced attenuation in the UV-vis range. Furthermore, it was found that γ-radiation "hardness" is higher in Er3+-doped sol-gel silica compared to un-doped sol-gel silica and standard synthetic silica glasses. The present work demonstrates an effective strategy to improve the radiation resistance of optical fiber preforms and glasses through glass fictive temperature reduction.
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Spallino L, Vaccaro L, Cannas M, Gelardi FM. Luminescence from nearly isolated surface defects in silica nanoparticles. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2015; 27:365301. [PMID: 26302715 DOI: 10.1088/0953-8984/27/36/365301] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A structured emission/excitation pattern, proper of isolated defects, arises in a vacuum from silica nanoparticles. The luminescence, centered around 3.0-3.5 eV, is characterised by a vibronic progression due to the phonon coupling with two localised modes of frequency ∼1370 cm(-1) and ∼360 cm(-1), and decays in about 300 ns at 10 K. On increasing the temperature, the intensity and the lifetime decrease due to the activation of a non-radiative rate from the excited state. Concurrently, the temperature dependence of the lineshape evidences the low coupling with non-localised modes of the matrix (Huang-Rhys factor S ~ 0.2) and the poor influence of the inhomogeneous broadening. These findings outline an uncommon behaviour in the field of the optical properties of defects in amorphous solids, evidencing that the silica surface can allocate luminescent defects almost disentangled from the basal network.
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Affiliation(s)
- L Spallino
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, I-90123 Palermo, Italy
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8
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El-Sayed AM, Watkins MB, Grasser T, Afanas'ev VV, Shluger AL. Hydrogen-induced rupture of strained Si─O bonds in amorphous silicon dioxide. PHYSICAL REVIEW LETTERS 2015; 114:115503. [PMID: 25839289 DOI: 10.1103/physrevlett.114.115503] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2014] [Indexed: 06/04/2023]
Abstract
Using ab initio modeling we demonstrate that H atoms can break strained Si─O bonds in continuous amorphous silicon dioxide (a-SiO(2)) networks, resulting in a new defect consisting of a threefold-coordinated Si atom with an unpaired electron facing a hydroxyl group, adding to the density of dangling bond defects, such as E' centers. The energy barriers to form this defect from interstitial H atoms range between 0.5 and 1.3 eV. This discovery of unexpected reactivity of atomic hydrogen may have significant implications for our understanding of processes in silica glass and nanoscaled silica, e.g., in porous low-permittivity insulators, and strained variants of a-SiO(2).
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Affiliation(s)
- Al-Moatasem El-Sayed
- Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Matthew B Watkins
- Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Tibor Grasser
- Institute for Microelectronics, Technische Universität Wien, A-1040 Vienna, Austria
| | - Valery V Afanas'ev
- Department of Physics, University of Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
| | - Alexander L Shluger
- Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, Gower Street, London WC1E 6BT, United Kingdom
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Stone JM, Wadsworth WJ, Knight JC. 1064 nm laser-induced defects in pure SiO₂ fibers. OPTICS LETTERS 2013; 38:2717-2719. [PMID: 23903121 DOI: 10.1364/ol.38.002717] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We investigate evidence of the formation of nonbridging oxygen hole centers in pure silica photonic crystal fibers from 5 ps 1064 nm pulses. The formation of the defects is attributed to the breaking of stressed silicon-oxygen bonds in the glass matrix through a many-photon process. We compare the photodarkening induced by the 1064 nm pump with photodarkening induced by short wavelength light in a 1064 nm pumped supercontinuum extending to 400 nm. It is shown that the higher peak power at the pump wavelength makes it a more significant cause of photodarkening when compared to the shorter wavelength light generated in the fiber.
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Affiliation(s)
- J M Stone
- Centre for Photonics and Photonic Materials, Department of Physics, University of Bath, Bath, UK.
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10
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Matsuda S, Miura M, Matsuda T, Ueda M, Satoh Y, Hashimoto KY. Correlation between propagation loss and silicon dioxide film properties for surface acoustic wave devices. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2013; 60:993-997. [PMID: 23661134 DOI: 10.1109/tuffc.2013.2657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The correlation between the propagation loss and SiO2 film properties has been studied for temperature-compensated SAW devices using the SiO2/LiNbO3 structure. The SAW devices were prepared under different deposition temperatures for SiO2 film. Although they possessed excellent temperature coefficient of elasticity characteristics, devices prepared at lower temperature showed lower Q-factors. The SiO2 films were also deposited on a Si substrate under the same deposition conditions used for the SAW device preparation. Optical characterization was performed with Fourier transform infrared spectroscopy (FT-IR), spectrometer measurement, and Raman spectroscopy. IR absorbance spectra were almost same in the FT-IR measurement. However, optical attenuation in the UV region decreased with the deposition temperature in the spectrometer measurement. The optical attenuation is caused by the increase of the extinction coefficient in the SiO2 layer, and its optical wavelength dependence indicated that observed excess attenuation is caused by Rayleigh scattering. The Raman scattering also decreased with the deposition temperature in the Raman spectroscopy. The scattering is caused by the distortion of the SiO2 network. These results indicate that the Rayleigh scattering caused by the distortion of the SiO2 network is the main contributor to the excess SAW propagation loss in this case.
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Pan W, Zhong W, Zhang D, Liu C. Theoretical Study of the Reactions of 2-Chlorophenol over the Dehydrated and Hydroxylated Silica Clusters. J Phys Chem A 2011; 116:430-6. [DOI: 10.1021/jp208571d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Wenxiao Pan
- Key Lab of Colloid and Interface Chemistry, Ministry of Education, Institute of Theoretical Chemistry, Shandong University, Jinan, 250100, People's Republic of China
| | - Wenhui Zhong
- Key Lab of Colloid and Interface Chemistry, Ministry of Education, Institute of Theoretical Chemistry, Shandong University, Jinan, 250100, People's Republic of China
| | - Dongju Zhang
- Key Lab of Colloid and Interface Chemistry, Ministry of Education, Institute of Theoretical Chemistry, Shandong University, Jinan, 250100, People's Republic of China
| | - Chengbu Liu
- Key Lab of Colloid and Interface Chemistry, Ministry of Education, Institute of Theoretical Chemistry, Shandong University, Jinan, 250100, People's Republic of China
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Li CH, Ju X, Jiang XD, Huang J, Zhou XD, Zheng Z, Wu WD, Zheng WG, Li ZX, Wang BY, Yu XH. High resolution characterization of modifications in fused silica after exposure to low fluence 355 nm laser at different repetition frequencies. OPTICS EXPRESS 2011; 19:6439-6449. [PMID: 21451672 DOI: 10.1364/oe.19.006439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We report on the characterization of modifications in fused silica after exposure to low fluence (2 J/cm2) 355 nm laser at repetition frequencies of 1 Hz, 5 Hz and 10 Hz. Synchrotron based XRF spectroscopy is employed to study concentration variation of metal inclusions in the surface layer. Positron annihilation lifetime spectroscopy is used to probe atomic size defects variation in bulk silica. FT-IR is used to characterize changes of bond length and angle of Si-O-Si covalent bond of irradiated silica. Compared to the basic frequency, the big loss of cerium and iron concentration, the size enlargement of vacancy cluster and the decrease of Si-O-Si covalent bond length after 10 Hz laser irradiation are illustrated by our data. These tiny modifications provide important data to investigate laser damage mechanism.
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Affiliation(s)
- C H Li
- Department of Physics, University of Science and Technology Beijing, Beijing 100083, China
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13
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Zhang SL, Zhang YH, Huang SP, Wang P, Tian HP. Molecular Dynamics Simulations of Silica Nanotube: Structural and Vibrational Properties Under Different Temperatures. CHINESE J CHEM PHYS 2010. [DOI: 10.1088/1674-0068/23/05/497-503] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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14
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Vaccaro L, Cannas M. The structural disorder of a silica network probed by site selective luminescence of the nonbridging oxygen hole centre. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:235801. [PMID: 21393769 DOI: 10.1088/0953-8984/22/23/235801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We studied the inhomogeneous distribution of the luminescence band associated with the nonbridging oxygen hole centre in silica through site selective excitation/detection of the zero phonon line by a tunable laser source. Defects induced in the bulk of synthetic samples by γ and β exposure exhibit an increase of the inhomogeneous width from 0.071 to 0.086 eV on increasing the irradiation dose from 2 × 10(6) to 5 × 10(9) Gy. We also investigated two defect variants stabilized at the surface of the silica nanoparticles, (≡ Si-O)3 Si–O* and (≡ Si-O)2(H-O)Si-O*, whose inhomogeneous width was measured to be 0.042 eV and 0.060 eV, respectively. These results can be accounted for by the structural disorder around the defect, and specific causes of its variation can be pointed out, such as the network modification induced by irradiation or the structural alteration near the SiO(4) coordination sphere.
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Affiliation(s)
- L Vaccaro
- Dipartimento di Scienze Fisiche ed Astronomiche, Università di Palermo, Via Archirafi 36, I-90123 Palermo, Italy.
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Kadono K, Itakura N, Akai T, Yamashita M, Yazawa T. Formation of color centers in a soda-lime silicate glass by excimer laser irradiation. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:045901. [PMID: 21386324 DOI: 10.1088/0953-8984/22/4/045901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We have investigated defect generation in soda-lime silicate and iron-doped soda-lime silicate glasses by excimer laser irradiation in order to apply coloration due to radiation-induced defects as a coloring technique for practical glass products. The laser irradiation generated various kinds of defects, i.e., non-bridging oxygen hole centers (NBOHCs), E' centers, and trapped electron centers, as does x-ray and γ-ray irradiation. The amounts of generated NBOHCs, monitored by the absorption intensity, increased at first with the irradiation time for both the ArF and XeF lasers, and eventually became saturated. The saturated values for the ArF laser irradiation were almost the same regardless of the laser intensity, whereas those for the XeF laser irradiation were dependent on the intensity; a higher intensity generated a larger amount of NBOHCs. From the comparison of the energies of the photon and the absorption edge of the soda-lime silicate glasses, the defect generation reactions were expected to be one-photon and two-photon processes for the ArF and XeF lasers, respectively. In order to explain the defect generation behavior, we used a simple kinetic model in which the NBOHCs are reversibly generated and annihilated through the photo-reaction. The model includes a stretched exponential function, which is often observed for reactions occurring in amorphous materials. The dependences of the amounts of the generated NBOHCs on the irradiation time and intensity of the laser pulses derived from the model were consistent with the experimental results.
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Affiliation(s)
- Kohei Kadono
- Division of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, Japan.
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Messina F, Cannas M, Boscaino R. Generation of defects in amorphous SiO(2) assisted by two-step absorption on impurity sites. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2008; 20:275210. [PMID: 21694371 DOI: 10.1088/0953-8984/20/27/275210] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Generation of the Si dangling bond defect in amorphous SiO(2) (E' centre) induced by tunable pulsed UV laser radiation was investigated by in situ optical absorption measurements. The defect generation efficiency peaks when the photon energy equals ∼5.1 eV, it depends quadratically on laser intensity and is correlated with the native linear absorption due to Ge impurities. We propose a model in which the generation of E' is assisted by a two-step absorption process occurring on Ge impurity sites.
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Affiliation(s)
- F Messina
- Dipartimento di Scienze Fisiche ed Astronomiche, Università di Palermo, Via Archirafi 36, I-90123 Palermo, Italy
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Kajihara K, Hirano M, Skuja L, Hosono H. Formation of Intrinsic Point Defects in Fluorine-doped Synthetic SiO2Glass by60Co γ-ray Irradiation. CHEM LETT 2007. [DOI: 10.1246/cl.2007.266] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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18
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Hosono H, Kamiya T, Hirano M. Function Cultivation of Transparent Oxides Utilizing Built-In Nanostructure. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2006. [DOI: 10.1246/bcsj.79.1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Saitoh A, Murata S, Matsuishi S, Oto M, Miura T, Hirano M, Hosono H. Elucidation of Phosphorus Co-doping Effect on Photoluminescence in Ce3+-activated SiO2Glasses: Determination of Solvation Shell Structure by Pulsed EPR. CHEM LETT 2005. [DOI: 10.1246/cl.2005.1116] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Kamioka H, Hiramatsu H, Hayashi K, Hirano M, Hosono H. Photonic materials utilizing naturally occurring nanostructures. J Photochem Photobiol A Chem 2004. [DOI: 10.1016/j.jphotochem.2004.04.033] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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22
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Fois E, Gamba A, Tabacchi G, Coluccia S, Martra G. Ab Initio Study of Defect Sites at the Inner Surfaces of Mesoporous Silicas. J Phys Chem B 2003. [DOI: 10.1021/jp036182b] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- E. Fois
- Dipartimento di Scienze CFM, Universita' dell'Insubria, and INSTM, UdR Como, Via Lucini 3, I-22100 Como, Italy, and Dipartimento di Chimica IFM, Universita' di Torino, and INSTM, UdR Universita' Torino, via Giuria 7 I-10125 Torino, Italy
| | - A. Gamba
- Dipartimento di Scienze CFM, Universita' dell'Insubria, and INSTM, UdR Como, Via Lucini 3, I-22100 Como, Italy, and Dipartimento di Chimica IFM, Universita' di Torino, and INSTM, UdR Universita' Torino, via Giuria 7 I-10125 Torino, Italy
| | - G. Tabacchi
- Dipartimento di Scienze CFM, Universita' dell'Insubria, and INSTM, UdR Como, Via Lucini 3, I-22100 Como, Italy, and Dipartimento di Chimica IFM, Universita' di Torino, and INSTM, UdR Universita' Torino, via Giuria 7 I-10125 Torino, Italy
| | - S. Coluccia
- Dipartimento di Scienze CFM, Universita' dell'Insubria, and INSTM, UdR Como, Via Lucini 3, I-22100 Como, Italy, and Dipartimento di Chimica IFM, Universita' di Torino, and INSTM, UdR Universita' Torino, via Giuria 7 I-10125 Torino, Italy
| | - G. Martra
- Dipartimento di Scienze CFM, Universita' dell'Insubria, and INSTM, UdR Como, Via Lucini 3, I-22100 Como, Italy, and Dipartimento di Chimica IFM, Universita' di Torino, and INSTM, UdR Universita' Torino, via Giuria 7 I-10125 Torino, Italy
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23
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Malki A, Humbert G, Ouerdane Y, Boukhenter A, Boudrioua A. Investigation of the writing mechanism of electric-arc-induced long-period fiber gratings. APPLIED OPTICS 2003; 42:3776-3779. [PMID: 12868814 DOI: 10.1364/ao.42.003776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The mechanism for inscription of electric-arc-induced long-period gratings in SMF28 fiber was studied. The refractive-index profiles of irradiated fiber samples were measured, and their structures were investigated by Raman and luminescence spectroscopy. Slight geometrical deformations of the irradiated fiber were measured. A significant change in the Raman spectrum range from 200 to 700 cm(-1) caused by the electric arc is reported. The results show a decrease in the intensity of this band, indicating a modification, such as densification, of the glass structure. No modification of the fictive temperature was measured. A large increase in the red luminescence band was also observed and attests to the creation of defects in the fiber network structure.
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Affiliation(s)
- Abdelrafik Malki
- Laboratoire d'Electronique Micro-technologies et Instrumentation, Institut Universitaire de Technologie de Rouen, Rue Lavoisier 76821, Mont Saint Aignan, France.
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24
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Lazzeri M, Mauri F. First-principles calculation of vibrational Raman spectra in large systems: signature of small rings in crystalline SiO2. PHYSICAL REVIEW LETTERS 2003; 90:036401. [PMID: 12570512 DOI: 10.1103/physrevlett.90.036401] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2002] [Indexed: 05/24/2023]
Abstract
We present an approach for the efficient calculation of vibrational Raman intensities in periodic systems within density functional theory. The Raman intensities are computed from the second order derivative of the electronic density matrix with respect to a uniform electric field. In contrast to previous approaches, the computational effort required by our method for the evaluation of the intensities is negligible compared to that required for the calculation of vibrational frequencies. As a first application, we study the signature of 3- and 4-membered rings in the Raman spectra of several polymorphs of SiO2, including a zeolite (H-ZSM-18) having 102 atoms per unit cell.
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Affiliation(s)
- Michele Lazzeri
- Laboratoire de Minéralogie Cristallographie de Paris, 4 Place Jussieu, 75252 Paris cedex 05, France
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25
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Kajihara K, Skuja L, Hirano M, Hosono H. Diffusion and reactions of hydrogen in F2-laser-irradiated SiO2 glass. PHYSICAL REVIEW LETTERS 2002; 89:135507. [PMID: 12225039 DOI: 10.1103/physrevlett.89.135507] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2002] [Indexed: 05/23/2023]
Abstract
The diffusion and reactions of hydrogenous species generated by single-pulsed F2 laser photolysis of SiO-H bond in SiO2 glass were studied in situ between 10 and 330 K. Experimental evidence indicates that atomic hydrogen (H0) becomes mobile even at temperatures as low as approximately 30 K. A sizable number of H0 dimerize by a diffusion-limited reaction into molecular hydrogen (H2) that may migrate above approximately 200 K. Activation energies for the diffusion, inherently scattered due to the structural disorder in glass, are separated into three bands centered at approximately 0.1 eV for free H0, approximately 0.2 eV presumably for shallow-trapped H0, and approximately 0.4 eV for H2.
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Affiliation(s)
- Koichi Kajihara
- Transparent Electro-Active Materials Project, ERATO, Japan Science and Technology Corporation, KSP C-1232, 3-2-1 Sakado, Takatsu-ku, Kawasaki 213-0012, Japan
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