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Showing 13 to 24 of 326 entries
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Understanding fundamental processes in poly(9,9-dioctylfluorene) light-emitting diodes via ultrafast electric-field-assisted pump-probe spectroscopy.

Physical review letters

Virgili T, Cerullo G, Lüer L, Lanzani G, Gadermaier C, Bradley DD.
PMID: 12857226
Phys Rev Lett. 2003 Jun 20;90(24):247402. doi: 10.1103/PhysRevLett.90.247402. Epub 2003 Jun 18.

Femtosecond electric-field-assisted pump-probe measurements are a new approach to the study of fundamental processes within organic optoelectronic devices. Here we report a detailed study of organic light-emitting diodes based on poly(9,9-dioctylfluorene), using both temporal and spectral information to investigate...

Intersubband exciton relaxation dynamics in single-walled carbon nanotubes.

Physical review letters

Manzoni C, Gambetta A, Menna E, Meneghetti M, Lanzani G, Cerullo G.
PMID: 16090288
Phys Rev Lett. 2005 May 27;94(20):207401. doi: 10.1103/PhysRevLett.94.207401. Epub 2005 May 23.

We study exciton (EX) dynamics in single-walled carbon nanotubes (SWNTs) included in polymethylmethacrylate by two-color pump-probe experiments with unprecedented temporal resolution. In the semiconducting SWNTs, we resolve the intersubband energy relaxation from the EX2 to the EX1 transition and...

Er:Yb-doped waveguide laser fabricated by femtosecond laser pulses.

Optics letters

Taccheo S, Valle GD, Osellame R, Cerullo G, Chiodo N, Laporta P, Svelto O, Killi A, Morgner U, Lederer M, Kopf D.
PMID: 15552666
Opt Lett. 2004 Nov 15;29(22):2626-8. doi: 10.1364/ol.29.002626.

Laser action is demonstrated in a 20-mm-long waveguide fabricated on an Er:Yb-doped phosphate glass by femtosecond laser pulses. An output power of 1.7 mW with approximately 300 mW of pump power coupled into the waveguide is obtained at 1533.5...

Imaging of Bloch oscillations in erbium-doped curved waveguide arrays.

Optics letters

Chiodo N, Della Valle G, Osellame R, Longhi S, Cerullo G, Ramponi R, Laporta P, Morgner U.
PMID: 16688250
Opt Lett. 2006 Jun 01;31(11):1651-3. doi: 10.1364/ol.31.001651.

We report a direct observation of Bloch-like dynamics of light in curved waveguide arrays manufactured in Er:Yb-doped phosphate glass by femtosecond laser writing. The green upconversion fluorescence emitted by excited erbium ions is exploited to image the flow of...

Sub-8-fs pulses from an ultrabroadband optical parametric amplifier in the visible.

Optics letters

Cerullo G, Nisoli M, Stagira S, De Silvestri S.
PMID: 18087499
Opt Lett. 1998 Aug 15;23(16):1283-5. doi: 10.1364/ol.23.001283.

Pulses with 180-THz bandwidth and 2-microJ energy were generated by a noncollinear optical parametric amplifier in the visible, pumped by the second harmonic of a Ti:sapphire laser. A portion of the amplified pulse spectrum was compressed to 7.2 fs...

Mirror-dispersion-controlled sub-10-fs optical parametric amplifier in the visible.

Optics letters

Cerullo G, Nisoli M, Stagira S, De Silvestri S, Tempea G, Krausz F, Ferencz K.
PMID: 18079855
Opt Lett. 1999 Nov 01;24(21):1529-31. doi: 10.1364/ol.24.001529.

Pulses from an optical parametric amplifier in the visible are compressed to sub-10-fs duration by a delay line made exclusively from chirped dielectric mirrors. We employ what we believe are the first ultrabroadband visible chirped mirrors, which provide negative...

Generation of high-energy self-phase-stabilized pulses by difference-frequency generation followed by optical parametric amplification.

Optics letters

Manzoni C, Vozzi C, Benedetti E, Sansone G, Stagira S, Svelto O, De Silvestri S, Nisoli M, Cerullo G.
PMID: 16602187
Opt Lett. 2006 Apr 01;31(7):963-5. doi: 10.1364/ol.31.000963.

We produce ultrabroadband self-phase-stabilized near-IR pulses by a novel approach where a seed pulse, obtained by difference-frequency generation of a hollow-fiber broadened supercontinuum, is amplified by a two-stage optical parametric amplifier. Energies up to 20 microJ with a pulse...

Single-cycle multiterahertz transients with peak fields above 10 MV/cm.

Optics letters

Junginger F, Sell A, Schubert O, Mayer B, Brida D, Marangoni M, Cerullo G, Leitenstorfer A, Huber R.
PMID: 20680086
Opt Lett. 2010 Aug 01;35(15):2645-7. doi: 10.1364/OL.35.002645.

Phase-locked single-cycle transients with frequency components between 1 and 60THz and peak fields of up to 12MV/cm are generated as the idler wave of a parametric amplifier. To achieve broadband conversion in GaSe nonlinear crystals, we match the group...

Fabrication of binary Fresnel lenses in PMMA by femtosecond laser surface ablation.

Optics express

Vázquez RM, Eaton SM, Ramponi R, Cerullo G, Osellame R.
PMID: 21716392
Opt Express. 2011 Jun 06;19(12):11597-604. doi: 10.1364/OE.19.011597.

We report on the fabrication of binary Fresnel lenses by femtosecond laser surface ablation of poly(methyl methacrylate) (PMMA) substrates. Tight focusing of the laser pulses produced a minimum ablated feature size of 600 nm, enabling the creation of lenses...

A versatile apparatus for time-resolved photoemission spectroscopy via femtosecond pump-probe experiments.

The Review of scientific instruments

Carpene E, Mancini E, Dallera C, Ghiringhelli G, Manzoni C, Cerullo G, De Silvestri S.
PMID: 19485528
Rev Sci Instrum. 2009 May;80(5):055101. doi: 10.1063/1.3125049.

A laser-based system for time-resolved photoemission spectroscopy using up to 6.2 eV photons is presented. The versatility of the laser source permits several combinations of pump and probe photon energies with pulse durations of 50-100 fs. The ultrahigh vacuum...

Fabrication of photonic devices in nanostructured glasses by femtosecond laser pulses.

Optics express

Martinez-Vazquez R, Osellame R, Cerullo G, Ramponi R, Svelto O.
PMID: 19550531
Opt Express. 2007 Oct 01;15(20):12628-35. doi: 10.1364/oe.15.012628.

Focused femtosecond laser pulses have been used to modify the optical properties of glass doped with CdSxSe1-x nanocrystals. Large positive refractive index changes have been observed and exploited for the fabrication of photonic devices. In particular, we report on...

Ultrafast dynamics of exciton fission in polycrystalline pentacene.

Journal of the American Chemical Society

Wilson MW, Rao A, Clark J, Kumar RS, Brida D, Cerullo G, Friend RH.
PMID: 21755937
J Am Chem Soc. 2011 Aug 10;133(31):11830-3. doi: 10.1021/ja201688h. Epub 2011 Jul 14.

We use ultrafast transient absorption spectroscopy with sub-20 fs time resolution and broad spectral coverage to directly probe the process of exciton fission in polycrystalline thin films of pentacene. We observe that the overwhelming majority of initially photogenerated singlet...

Showing 13 to 24 of 326 entries