Various types of nonbridging oxygen hole center in high-purity silica glass

Munekuni, Shuji; Yamanaka, Toshihisa; Shimogaichi, Yasushi; Tohmon, Ryoichi; Ohki, Yoshimichi; Nagasawa, Kaya; Hama, Yoshimasa

doi:10.1063/1.346719

Cited by 227 publications

(128 citation statements)

References 9 publications

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“…There has been considerable debate in the literature over the origin of the 1.9 and 2 eV luminescence bands in silica, 34,35 but the current model suggests that they are due to emission from nonbridging oxygen hole centers ͑NBOHCs͒ 34 Such defects are usually associated with the radiolysis of hydroxyl groups or the cleavage of strained silicon-oxygen bonds by irradiation:…”

Section: Discussionmentioning

confidence: 99%

The origin of photoluminescence from thin films of silicon-rich silica

Kenyon

Trwoga

Pitt

et al. 1996

Journal of Applied Physics

205

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We have carried out a study of the photoluminescence properties of silicon-rich silica. A series of films grown using plasma enhanced chemical vapor deposition over a range of growth conditions were annealed under argon at selected temperatures. Photoluminescence spectra were measured for each film at room temperature and for selected films at cryogenic temperatures. The photoluminescence spectra exhibit two bands. Fourier transform infrared and electron spin resonance spectroscopies were used to investigate bonding and defect states within the films. The data obtained strongly suggest the presence of two luminescence mechanisms which exhibit different dependencies on film growth conditions and postprocessing. We make assignments of the two mechanisms as ͑1͒ defect luminescence associated with oxygen vacancies and ͑2͒ radiative recombination of electron-hole pairs confined within nanometer-size silicon clusters ͑''quantum confinement''͒.

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Section: Discussionmentioning

confidence: 99%

The origin of photoluminescence from thin films of silicon-rich silica

Kenyon

Trwoga

Pitt

et al. 1996

Journal of Applied Physics

205

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“…These optical transitions correspond to three spectral regions: ͑i͒ from 1.85 eV ͑670 nm͒ to 2.0 eV ͑620 nm͒, ͑ii͒ at about 2.2 eV ͑564 nm͒, and ͑iii͒ from 2.4 eV ͑517 nm͒ to 2.8 eV ͑443 nm͒. [27][28][29] The peak positions of the emission bands obtained from the MLs ͑full symbols͒ and the silica layers ͑open symbols͒ have been plotted in Fig. 7 as a function of the annealing temperature, T A .…”

Section: B Annealing Treatmentmentioning

confidence: 99%

Silicon-rich SiO2/SiO2 multilayers: A promising material for the third generation of solar cell

Gourbilleau

Ternon

Maestre

et al. 2009

Journal of Applied Physics

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Method for fabricating third generation photovoltaic cells based on Si quantum dots using ion implantation into SiO2 J. Appl. Phys. 109, 084337 (2011) Si-rich-SiO 2 ͑SRSO͒ / SiO 2 multilayers ͑MLs͒ have been grown by reactive magnetron sputtering. The presence of silicon nanoclusters ͑Si-ncls͒ within the SRSO sublayer and annealing temperature influence optical absorption as well as photoluminescence. The optimized annealing temperature has been found to be 1100°C, which allows the recovery of defects and thus enhances photoluminescence. Four MLs with Si-ncl size ranging from 1.5 to 8 nm have been annealed using the optimized conditions and then studied by transmission measurements. Optical absorption has been modeled so that a size effect in the linear absorption coefficient ␣ ͑in cm −1 ͒ has been evidenced and correlated with TEM observations. It is demonstrated that amorphous Si-ncl absorption is fourfold higher than that of crystalline Si-ncls.

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“…[46] Figure 3a shows the measured resonant spectrum of a micro tube before trapping a microsphere. Because of the ultrathin tube wall, only transversemagnetic (TM) modes (defined as optical electric field parallel to the tube axis) can be clearly observed, which are labeled by azimuthal mode number M = 58-74 in the resonant spectrum.…”

Section: Fabrication and Characterizationsmentioning

confidence: 99%

Strong Coupling in a Photonic Molecule Formed by Trapping a Microsphere in a Microtube Cavity

Wang

Yin

et al. 2017

Advanced Optical Materials

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role for the efficient intercavity coupling. However, the evanescent field is relatively weak in the reported photonic mole cules because most of the optical field is strongly confined within the coupled cavities (e.g., microdisks, [4,8,11,18] micro toroids, [19] microspheres, [3] microrods, [5,20] and microfibers [7] ). As such, one needs a deliberate control on both the cavity geometries and the intercavity coupling gap to ensure a good spectral match and efficient evanescent coupling between the coupled cavities. [18] Moreover, dynamic tuning of the intercavity coupling strength has been investigated in recent years, which were carried out by advanced and sophisticated techniques such as strain tuning, [21,22] acoustooptic control, [23] and precise micromanipulation techniques. [3] To extend and promote the research in the field of photonic molecules, it is of high interest to design novel photonic molecules extending from adjacent solid microcavities to thinwalled hollow cavities which possess intense evanescent field facilitating intercavity coupling and provide novel strategy for tuning of the coupling strength.Microtube cavities, which are formed by selfrolling of pre strained nanomembranes, feature unique properties such as hollowcore structures and ultrathin cavity walls (≈100-300 nm) for the study of lightmatter interactions and the integration of "labinatube" systems. [24][25][26][27] These key merits enable extensive applications ranging from optofluidic sensing, [28][29][30][31] single cell analysis, [32] dynamic molecular process detection, [33] photon plasmon coupling, [34] to optical spin-orbit coupling.[35] To combine with other media/objects, luminescent quantum dots, [36,37] quantum wells, [38] and organic molecules [39] have been enwrapped into the microtube wall by the rolling up process, which couple photoluminescence (PL) light to the microtube cavities to support whisperinggallery mode (WGM) resonances. [37,40] In this context, a design and demonstration of photonic molecule based on microtube cavity is of fundamental interest for the study of strong optical coupling and the promo tion of its potential applications.Herein, we report a novel design of photonic molecule by trapping a microsphere cavity into the hollow core of a rolled up microtube cavity. We focus on studying the WGM coupling between the trapped microsphere and microtube cavity with a significant difference of cavity sizes, which is in contrast to pre vious reports where the two externally adjacent microcavities possess highly similar sizes [11,12,41] or slightly mismatched sizes (less than two times). [4][5][6][7]18,[42][43][44] Periodic modulations on A photonic molecule formed by trapping a microsphere cavity into a hollow microtube cavity is demonstrated, which provides a novel design over conventional photonic molecules comprised of solid-core whispering gallery mode microcavities with externally tangent configuration. Periodic spectral modulations of mode intensity, resonant mode shift, and quality factor are observed...

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Various types of nonbridging oxygen hole center in high-purity silica glass

Cited by 227 publications

References 9 publications

The origin of photoluminescence from thin films of silicon-rich silica

The origin of photoluminescence from thin films of silicon-rich silica

Silicon-rich SiO2/SiO2 multilayers: A promising material for the third generation of solar cell

Strong Coupling in a Photonic Molecule Formed by Trapping a Microsphere in a Microtube Cavity

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