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  • Book
    Wang F, Popa D, Sun Z, Hasan T, Torrisi F, Ferrari ACet al., 2010,

    Characterization of dynamic nonlinear absorption of carbon nanotube saturable absorber

    , ISBN: 9781557528896

    Dynamic nonlinear absorption of composite-type single-wall carbon nanotube saturable absorbers is characterized using both femtosecond and picosecond pump pulses. Results are compared with numerical simulations based on two commonly used saturable absorber models. © 2010 Optical Society of America.
  • Conference paper
    Hasan T, Torrisi F, Sun Z, Popa D, Nicolosi V, Privitera G, Bonaccorso F, Ferrari ACet al., 2010,

    Solution-phase exfoliation of graphite for ultrafast photonics

    , Pages: 2953-2957, ISSN: 0370-1972
  • Journal article
    Popa D, Sun Z, Torrisi F, Hasan T, Wang F, Ferrari ACet al., 2010,

    Sub 200 fs pulse generation from a graphene mode-locked fiber laser

    , APPL PHYS LETT, Vol: 97, ISSN: 0003-6951
  • Journal article
    Sun ZP, Popa D, Hasan T, Torrisi F, Wang FQ, Kelleher EJR, Travers JC, Nicolosi V, Ferrari ACet al., 2010,

    A stable, wideband tunable, near transform-limited, graphene-mode-locked, ultrafast laser

    , NANO RES, Vol: 3, Pages: 653-660, ISSN: 1998-0124
  • Journal article
    Sun Z, Hasan T, Torrisi F, Popa D, Privitera G, Wang F, Bonaccorso F, Basko DM, Ferrari ACet al., 2010,

    Graphene mode-locked ultrafast laser.

    , ACS Nano, Vol: 4, Pages: 803-810, ISSN: 1936-086X

    Graphene is at the center of a significant research effort. Near-ballistic transport at room temperature and high mobility make it a potential material for nanoelectronics. Its electronic and mechanical properties are also ideal for micro- and nanomechanical systems, thin-film transistors, and transparent and conductive composites and electrodes. Here we exploit the optoelectronic properties of graphene to realize an ultrafast laser. A graphene-polymer composite is fabricated using wet-chemistry techniques. Pauli blocking following intense illumination results in saturable absorption, independent of wavelength. This is used to passively mode-lock an erbium-doped fiber laser working at 1559 nm, with a 5.24 nm spectral bandwidth and approximately 460 fs pulse duration, paving the way to graphene-based photonics.
  • Conference paper
    Popa D, Sun Z, Torrisi F, Hasan T, Wang F, Ferrari ACet al., 2010,

    Generation of 63-nJ pulses from a fiber oscillator mode-locked by nanotubes
  • Conference paper
    Sun Z, Hasan T, Popa D, Torrisi F, Wang F, Bonaccorso F, Ferrari ACet al., 2010,

    Ultrafast Fiber Laser Mode-locked by Graphene Based Saturable Absorber
  • Conference paper
    Wang F, Popa D, Sun Z, Hasan T, Torrisi F, Ferrari ACet al., 2010,

    Characterization of Dynamic Nonlinear Absorption of Carbon Nanotube Saturable Absorber
  • Journal article
    La Fata P, Torrisi F, Lombardo S, Nicotra G, Puglisi R, Rimini Eet al., 2009,

    Amorphous to fcc-polycrystal transition in Ge2Sb2Te5 thin films studied by electrical measurements: Data analysis and comparison with direct microscopy observations

    , JOURNAL OF APPLIED PHYSICS, Vol: 105, ISSN: 0021-8979
  • Journal article
    La Fata P, Puglisi R, Lombardo S, Bongiorno Cet al., 2008,

    Nano-patterning with Block Copolymers

    , SUPERLATTICES AND MICROSTRUCTURES, Vol: 44, Pages: 693-698, ISSN: 0749-6036
  • Journal article
    Geyer T, Torrisi FD, Morari M, 2008,

    Optimal complexity reduction of polyhedral piecewise affine systems

    , AUTOMATICA, Vol: 44, Pages: 1728-1740, ISSN: 0005-1098
  • Journal article
    Sciacca E, Lombardo S, Mazzillo M, Condorelli G, Sanfilippo D, Contissa A, Belluso M, Torrisi F, Billotta S, Campisi Aet al., 2006,

    Arrays of geiger mode avalanche photodiodes

    , IEEE Photonics Technology Letters, Vol: 18, Pages: 1633-1635, ISSN: 1041-1135

    Following our previous work which has led us to fabricate single pixels of geiger mode avalanche photodiodes (GMAPs), we present in this letter the results regarding the fabrication and characterization of a bidimensional array of GMAPs. Low dark count rates and very good uniformity over the sensor are reported. High quantum efficiency in the visible range has been measured. Measurements indicate that not all the nominal active area is effectively sensitive. We have some preliminary evidence that no crosstalk effects are present in our device. Notwithstanding this, in view of a near future shrinking of all dead regions, an optical trench process has been developed and is illustrated here. Possible future trends are highlighted. © 2006 IEEE.
  • Journal article
    Potocnik B, Bemporad A, Torrisi FD, Music G, Zupancic Bet al., 2004,

    Hybrid modelling and optimal control of a Multiproduct Batch Plant

    , CONTROL ENGINEERING PRACTICE, Vol: 12, Pages: 1127-1137, ISSN: 0967-0661
  • Journal article
    Grieder P, Borrelli F, Torrisi F, Morari Met al., 2004,

    Computcation of the constrained infinite time linear quadratic regulator

    , AUTOMATICA, Vol: 40, Pages: 701-708, ISSN: 0005-1098
  • Journal article
    Torrisi FD, Bemporad A, 2004,

    HYSDEL - A tool for generating computational hybrid models for analysis and synthesis problems

    , IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, Vol: 12, Pages: 235-249, ISSN: 1063-6536
  • Journal article
    Bemporad A, Filippi C, Torrisi FD, 2004,

    Inner and outer approximations of polytopes using boxes

    , COMPUTATIONAL GEOMETRY-THEORY AND APPLICATIONS, Vol: 27, Pages: 151-178, ISSN: 0925-7721
  • Conference paper
    Geyer T, Torrisi FD, Morari M, 2004,

    Optimal complexity reduction of piecewise affine models based on hyperplane arrangements

    , American Control Conference, Publisher: IEEE, Pages: 1190-1195, ISSN: 0743-1619
  • Conference paper
    Liscidini A, Brandolini M, Rossi P, Torrisi F, Svelto Fet al., 2004,

    Design methodology of feedback-LNAs for GHz applications

    , BIPOLAR/BiCMOS Circuits and Technology Meeting, Publisher: IEEE, Pages: 253-256, ISSN: 1088-9299
  • Conference paper
    Bonfanti A, Levantino S, Pellerano S, Samori C, Lacaita AL, Torrisi Fet al., 2003,

    A voltage-controlled oscillator for IEEE 802.11a and HiperLAN2 application

    , 29th European Solid-State Circuits Conference, Publisher: IEEE, Pages: 695-698
  • Conference paper
    Grieder P, Borrelli F, Torrisi F, Morari Met al., 2003,

    Computation of the constrained infinite time linear quadratic regulator

    , Annual American Control Conference (ACC 2003), Publisher: IEEE, Pages: 4711-4716, ISSN: 0743-1619

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Dr Felice Torrisi
Senior Lecturer in Chemistry of Two-Dimensional Materials

401A
Molecular Sciences Research Hub
White City Campus

f.torrisi@imperial.ac.uk
+44 (0)20 7594 5818