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Article
KOR negative photoresist in integrated optics
Tests on Kodak Ortho Resist (KOR) have been made for application to integrated optics. This material is interesting with respect to other photoresists for its high sensitivity over a wide wavelength range. Opt...
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Chapter and Conference Paper
Hollow Waveguides for Long-Wavelength I.R. Radiation
The CO2 laser has been extensively used both in industrial and medical applications; however the provision of a flexible delivery system of the I.R. laser light to a target has been the most difficult problem. Up...
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Chapter
Integrated Optical Signal Processors: Design and Implementation Criteria
A very promising application field for integrated optical (I0) devices is represented by signal processing. In the I0 format it is limited to one-dimensional signals: however, this characteristic is of no cons...
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Chapter and Conference Paper
Spherical Waveguide Multiplexing Device
A wavelength multiplexer is descr ibed, character ized by a re-flection grating coupled to a waveguide spherical geodesic lens. The device, particularly suitable for monomode fibers, can be used also as a tapp...
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Chapter
Introduction to Integrated Optics: Characterisation and Modelling of Optical Waveguides
The first demonstration of the laser in 1960 opened the way to the development of lightwave technology; then the production of low-loss optical fibers in the 70s made guided-wave optical communication systems ...
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Article
Control of Semiconductor Particle Size in Sol-Gel Thin Films
Thin silica and silica-titania films containing CdS and PbS quantum size particles were obtained by separate preparation of the matrix and the colloidal sols and successive mixing. Sulfide particles were obtai...
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Chapter
Optical Tweezers: Laser Manipulation of Microparticles
Although the forces of radiation pressure have been well known to physicists, 1 for a long time it has been difficult to study them in the laboratory due to the presence of temperature gradients causing thermal f...
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Chapter
Microfabrication Technologies for Integrated Optical Devices
Microelectronics and Integrated Optics (10) share most of the microfabrication technologies, in particular micropatterning. Fabrication processes of 10 devices, however, are subject to specific requirements, i...
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Article
Control of semiconductor particle size in sol-gel thin films
Thin silica and silica-titania films containing CdS and PbS quantum size particles were obtained by separate preparation of the matrix and the colloidal sols and successive mixing. Sulfide particles were obtai...
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Article
Fabrication and Characterization of Sol-Gel GeO2-SiO2Erbium-Doped Planar Waveguides
GeO2-SiO2 sol-gel planar waveguides doped with Er were deposited by spinning on silica substrates. P2 O5 or Al2O3 were used as co-dopants to improve erbium dissolution in the GeO2-SiO2 matrix. Multilayer amorp...
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Chapter
Optical Sensors and Microsystems Using Liquid Crystals
An overview of the basic properties of liquid crystals has been presented as an introduction to the subject of design and fabrication processes of optoelectronic LC devices.
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Article
Er-doped silica-based waveguides prepared by different techniques: RF-sputtering, sol-gel and ion-exchange
Erbium-activated silica-based planar waveguides were prepared by three different technological routes: RF-sputtering, sol–gel and ion exchange. Various parameters of preparation were varied in order to optimiz...
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Article
Erbium-Activated Silica-Titania Planar Waveguides
(100 − x)SiO2-(x)TiO2-ErO3/2 planar waveguides, with 7 ≤ x ≤ 20 have been prepared by sol-gel route using the dip-coating technique. The thickness of the films was optimized to support a single propagating mode a...
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Article
Er3+/Yb3+ Co-Activated Silica-Alumina Monolithic Xerogels
Monolithic silica xerogels doped with different concentrations of Er3+, Yb3+ and Al3+ were prepared by sol-gel route. Densification was achieved by thermal treatment in air at 950°C for 120 h with a heating rate ...
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Article
Photoluminescence Spectroscopy of Er3+/Yb3+ Co-Activated Silica-Alumina Monolithic Xerogels
Two Er3+/Yb3+ monolithic silica-alumina xerogels doped with different Yb3+ concentrations were prepared by sol–gel route. The samples were thermally treated in air at 950°C for 120 h, and Raman and UV-visible-NIR...
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Article
Photoluminescence of rare-earth—doped glasses
Rare-earth elements are of interest in several high-tech and environmental application areas, the two major ones concerning magnetic and optical devices. In the latter field, one can exploit the unique photolu...
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Article
Effect of Yb3+ concentration on Er3+ luminescence properties of sol-gelderived silica-alumina xerogels
Er3+ / Yb3+ co-doped silica-alumina monolithic xerogels were prepared with the same concentration on 2 000 Er/Si ppm and 6 000 Al/Si ppm. The Yb/Si content was varied from 0 to 4 000 ppm Densification of the samp...
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Article
Reproducibility of splicer-based long-period fiber gratings for gain equalization
We fabricated long-period fiber gratings (LPFGs) using electric arc discharges. We observed that the fiber becomes slightly tapered due to longitudinal tension during the arc: this effect depends on the arc cu...
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Article
Er3+-activated silica inverse opals synthesized by the solgel method
We present the details of the sol-gel processing used to realize inverse silica opal, where the silica was activated with 0.3 mol% of Er3+ ions. The template (direct opal) was obtained assembling polystyrene sphe...
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Article
Diagnostic techniques for photonic materials based on Raman and Brillouin spectroscopies
The elastic and vibrational properties of a material, bulk or planar waveguide, are studied by Brillouin and Raman spectroscopy to follow the process of nanocrystals growth in glass-ceramics. The nanoparticles...
