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Showing 1–16 of 16 results
Advanced filters: Author: Alessandro Tredicucci Clear advanced filters

  • The integration of an optically pumped switch in a quantum cascade laser device yields a semiconductor terahertz amplifier that promises to extend the capabilities of time-domain spectroscopy.

    • Alessandro Tredicucci
    • Aldo Di Carlo
    News & Views
    Nature Photonics
    Volume: 3, P: 681-682

  • Electron relaxation time in semiconductor quantum dots, for terahertz transition energies, can be slowed down to the nanosecond range — a very encouraging result for the development of quantum-dot-based quantum cascade lasers.

    • Alessandro Tredicucci
    News & Views
    Nature Materials
    Volume: 8, P: 775-776

  • Applications of microdisk lasers are intrinsically limited by their planar and isotropic emission. Now, by implementing appropriate diffraction gratings along the disk circumference, scientists present a vertically emitting terahertz quantum-cascade microdisk laser, shedding light on the fabrication of arrays of single-mode, highly collimated and powerful terahertz sources.

    • Lukas Mahler
    • Alessandro Tredicucci
    • David A. Ritchie
    Research
    Nature Photonics
    Volume: 3, P: 46-49

  • Researchers provide experimental evidence of intrinsic linewidths approaching the quantum limit in a GaAs/AlGaAs quantum cascade laser emitting at 2.5 THz. Despite the expected dominant broadening effect induced by thermal photons, the measured intrinsic linewidth is 90 Hz — even narrower than that of a semiconductor laser working at significantly shorter wavelengths.

    • Miriam S. Vitiello
    • Luigi Consolino
    • Paolo De Natale
    Research
    Nature Photonics
    Volume: 6, P: 525-528

  • Researchers have constructed a terahertz quantum cascade laser using quasi-periodic distributed feedback gratings based on the Fibonacci sequence. Features that go beyond traditional distributed feedback lasers are demonstrated, such as directional output independent of the emission frequency and multicolour operation.

    • Lukas Mahler
    • Alessandro Tredicucci
    • Diederik S. Wiersma
    Research
    Nature Photonics
    Volume: 4, P: 165-169

  • Graphene shows promise for saturable absorption, a key property for ultrafast lasing, yet graphene saturable absorbers operating in the terahertz region suffer from low absorption modulation. Here, the authors report terahertz saturable absorbers based on inkjet printed graphene with 80% transparency modulation.

    • Vezio Bianchi
    • Tian Carey
    • Miriam S. Vitiello
    ResearchOpen Access
    Nature Communications
    Volume: 8, P: 1-9

  • Various vertical surface emitting, terahertz quantum-cascade lasers have been proposed recently but these suffer from power cancellations in the far-field and limited extraction efficiencies. Here, Vitiello et al.circumvent these issues using two-dimensional photonic quasi-crystalline resonators.

    • Miriam Serena Vitiello
    • Michele Nobile
    • A. Giles Davies
    ResearchOpen Access
    Nature Communications
    Volume: 5, P: 1-8

  • Known examples of negative refraction in metamaterials do not distinguish between positive and negative angles of incidence. Here, the authors show that it is possible to break this symmetry using an asymmetric unit cell, and demonstrate it using a mechanical metamaterial working at GHz frequencies.

    • Simone Zanotto
    • Giorgio Biasiol
    • Alessandro Pitanti
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-8