Modelling of diffractive structures in photorefractive Er/Yb–co-doped glass waveguides

Forastiere, Michele A.; Righini, Giancarlo C.; Brenci, M.; Pelli, S.; Ferraris, Monica; Milanese, Daniel

doi:10.1016/s0143-8166(01)00104-x

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…The enhancement of n by the hydrogen-loading is generally in the order of 10 −3 [2][3][4]12,13,[22][23][24]. The refractive index change ( n) by the UV irradiation for the asdeposited annealed at various temperatures and the hydrogenloaded samples are shown in figure 5.…”

Section: Resultsmentioning

confidence: 99%

Photosensitivity of 20GeO₂ : 80SiO₂hydrogen-loaded and non-hydrogen-loaded thin films

Rajni¹,

Pita²,

Ho³

et al. 2006

J. Phys. D: Appl. Phys.

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Photosensitive materials offer great potential for passive and active optical devices in communication, data manipulation and storage. We prepared photosensitive germanosilicate (20GeO2 : 80SiO2) inorganic thin films by the sol–gel method. These films were annealed at various temperatures in the range of 700–900 °C. The films annealed at 900 °C were found to be fully densified and were porous when annealed below 900 °C. The UV KrF laser (248 nm) has been used to induce refractive index change (Δn). We have studied the Fourier transform infra-red (FTIR) spectroscopy and the refractive index changes of the hydrogen-loaded and as-deposited samples before and after UV illumination. For the porous samples, the −OH absorption band around 3400 cm−1 increases with hydrogen-loading and decreases with UV radiation. The hydrogen-loading has induced absorption around 500–600 cm−1 for all our samples (both porous and dense samples) and that indicates the formation of Si–H bonds. The Si–H absorption bands disappeared after UV illumination. We observed the high Δn of about 0.0094 for the as-deposited dense film annealed at 900 °C and value enhanced to 0.0096 after H2-loading. For our samples, the large induced refractive index change is explained in terms of the formation of the oxygen related defects upon UV exposure. This is related to the induced absorption band around 620–740 cm−1 in the FTIR spectra.

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Section: Resultsmentioning

confidence: 99%

Photosensitivity of 20GeO₂ : 80SiO₂hydrogen-loaded and non-hydrogen-loaded thin films

Rajni¹,

Pita²,

Ho³

et al. 2006

J. Phys. D: Appl. Phys.

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“…The whole component would show zero loss at the output. Previous work was devoted on the optimization of the S-ErYb glass, leading to an active and photosensitive glass [11] suitable for the lossless splitter. In this paper the research activity was first focused on the fabrication of a suitable glass to host the splitter, then on direct bonding, which is the key process for the fabrication of the final device.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and direct bonding of photosensitive multicomponent silicate glasses for lossless planar waveguide splitters

Chen

Milanese

Chen

et al. 2008

Journal of Non-Crystalline Solids

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“…The upconversion phenomena was firstly explained in 1960's [28], and although a huge number of works have been devoted to UC processes [28,29], today many distinct applications such as visible range lasers [30], energy converter for solar cells [31][32][33], displays [34] and biological markers [35][36][37], among others are very actively studied. Most of the works investigating UC are related to halide crystals [29], glasses and glass ceramics, particularly oxyfluorides, phosphates, germanates and tellurides bulks and fibers [38][39][40][41][42][43][44]. Only a very few investigations are related to films and planar waveguides [45][46][47].…”

mentioning

confidence: 99%

Near infrared emission and multicolor tunability of enhanced upconversion emission from Er 3+ –Yb 3+ co-doped Nb 2 O 5 nanocrystals embedded in silica-based nanocomposite and planar waveguides for photonics

Aquino

Ferrari

Maia

et al. 2016

Journal of Luminescence

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This work reports on the Yb 3 þ ion addition effect on the near infrared emission and infrared-to-visible up conversion from planar waveguides based on Er 3 þ-Yb 3 þ co-doped Nb 2 O 5 nanocrystals embedded in SiO 2-based nanocomposite prepared by a sol-gel process with controlled crystallization in situ. Planar waveguides and xerogels containing Si/Nb molar ratio of 90:10 up to 50:50 were prepared. Spherical-like orthorhombic or monoclinic Nb 2 O 5 nanocrystals were grown in the amorphous SiO 2-based host depending on the niobium content and annealing temperature, resulting in transparent glass ceramics. Crystallization process was intensely affected by rare earth content increase. Enhancement and broadening of the NIR emission has been achieved depending on the rare earth content, niobium content and annealing temperature. Effective Yb 3 þ-Er 3 þ energy transfer and a high-intensity broad band emission in the near infrared region assigned to the Er 3 þ ions 4 I 13/2-4 I 15/2 transition, and longer 4 I 13/2 lifetimes were observed for samples containing orthorhombic Nb 2 O 5 nanocrystals. Intense green and red emissions were registered for all Er 3 þ-Yb 3 þ co-doped waveguides under 980 nm excitation, assigned to 2 H 11/2-4 I 15/2 (525 nm), 4 S 3/2-4 I 15/2 (545nm) and 4 F 9/2-4 I 15/2 (670 nm) transitions, respectively. Different relative green and red intensities emissions were observed, depending upon niobium oxide content and the laser power. Upconversion dynamics were determined by the photons number, evidencing that ESA or ETU mechanisms are probably occurring. The 1931 CIE chromaticity diagrams indicated interesting color tunability based on the waveguides composition and pump power. The nanocomposite waveguides are promising materials for photonic applications as optical amplifiers and WDM devices operating in the S, C, and L telecommunication bands; and as upconverter materials for visible upconversion lasers, biomedical applications, energy conversion for solar cells and others.

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Modelling of diffractive structures in photorefractive Er/Yb–co-doped glass waveguides

Cited by 4 publications

References 15 publications

Photosensitivity of 20GeO₂ : 80SiO₂hydrogen-loaded and non-hydrogen-loaded thin films

Photosensitivity of 20GeO₂ : 80SiO₂hydrogen-loaded and non-hydrogen-loaded thin films

Fabrication and direct bonding of photosensitive multicomponent silicate glasses for lossless planar waveguide splitters

Near infrared emission and multicolor tunability of enhanced upconversion emission from Er 3+ –Yb 3+ co-doped Nb 2 O 5 nanocrystals embedded in silica-based nanocomposite and planar waveguides for photonics

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Modelling of diffractive structures in photorefractive Er/Yb–co-doped glass waveguides

Cited by 4 publications

References 15 publications

Photosensitivity of 20GeO2 : 80SiO2hydrogen-loaded and non-hydrogen-loaded thin films

Photosensitivity of 20GeO2 : 80SiO2hydrogen-loaded and non-hydrogen-loaded thin films

Fabrication and direct bonding of photosensitive multicomponent silicate glasses for lossless planar waveguide splitters

Near infrared emission and multicolor tunability of enhanced upconversion emission from Er 3+ –Yb 3+ co-doped Nb 2 O 5 nanocrystals embedded in silica-based nanocomposite and planar waveguides for photonics

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Photosensitivity of 20GeO₂ : 80SiO₂hydrogen-loaded and non-hydrogen-loaded thin films

Photosensitivity of 20GeO₂ : 80SiO₂hydrogen-loaded and non-hydrogen-loaded thin films