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15 Result(s)

within G. C. Righini Remove this filter Optics, Lasers, Photonics, Optical Devices Remove this filter

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  1. Article

    Open Access

    Sol–gel-derived photonic structures handling erbium ions luminescence

    The sol–gel technique is a very flexible, relatively simple, and low-cost method to fabricate many different innovative photonic structures characterized by specific functionalities. During synthesis, starting...

    A. Lukowiak, A. Chiappini, A. Chiasera, D. Ristic… in Optical and Quantum Electronics (2015)

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  2. No Access

    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...

    I. Cacciari, M. Brenci, R. Falciai, G. Nunzi Conti, S. Pelli… in Optoelectronics Letters (2007)

  3. No Access

    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...

    A. Chiappini, C. Armellini, A. Chiasera, Y. Jestin, M. Ferrari… in Optoelectronics Letters (2007)

  4. No Access

    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...

    M. Mattarelli, S. Caponi, A. Chiappini, M. Montagna, E. Moser… in Optoelectronics Letters (2007)

  5. No Access

    Article

    Assessment of nanocomposite photonic systems with the X-ray photoelectron spectroscopy

    The chemical compositions of Ag-Er co-doped phosphate and silicate glasses were investigated with X-ray photoelectron spectroscopy with the purpose to identify the chemical state of silver. The analysis of the...

    L. Minati, G. Speranza, M. Anderle, M. Ferrari, A. Chiasera… in Optoelectronics Letters (2007)

  6. No Access

    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...

    K. Tran Ngoc, H. Pham Thanh, C. Nguyen Duc, C. Armellini… in Optoelectronics Letters (2006)

  7. No Access

    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...

    G.C. Righini, S. Pelli, M. Ferrari, C. Armellini… in Optical and Quantum Electronics (2002)

  8. No Access

    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.

    L. Sirleto, G. Abbate, G. C. Righini, E. Santamato in Optical Sensors and Microsystems (2000)

  9. No Access

    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...

    G. C. Righini in Diffractive Optics and Optical Microsystems (1997)

  10. No Access

    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...

    G. C Righini, M. A. Forastiere in Diffractive Optics and Optical Microsystems (1997)

  11. No Access

    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 ...

    S. Pelli, G. C. Righini in Advances in Integrated Optics (1994)

  12. No Access

    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...

    V. Russo, S. Sottini, G. C. Righini, S. Trigari in Integrated Optics (1985)

  13. No Access

    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...

    M. Brenci, R. Falciai, G. C. Righini, V. Russo, A. M. Scheggi… in Optical Waveguide Sciences (1983)

  14. No Access

    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...

    G. C. Righini in Integrated Optics (1983)

  15. No Access

    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...

    G. -C. Righini, V. Russo, S. Sottini in Optical and Quantum Electronics (1975)