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Showing 1–22 of 22 results
Advanced filters: Author: A. Tredicucci Clear advanced filters

  • Frequency comb synthesizers are important for metrology, but they have been difficult to use as frequency rulers in the terahertz region due to their low power. Consolinoet al. phase-lock a quantum cascade laser to a free-space-propagating terahertz comb, demonstrating that they can overcome this limitation.

    • L. Consolino
    • A. Taschin
    • P. De Natale
    Research
    Nature Communications
    Volume: 3, P: 1-5

  • 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

  • Its high carrier mobility is one of the factors that makes graphene interesting for electronic and photonic applications at terahertz frequencies. Such possibilities are now further supported by the demonstration of an efficient room-temperature graphene detector for terahertz radiation that promises to be considerably faster than competing techniques.

    • L. Vicarelli
    • M. S. Vitiello
    • A. Tredicucci
    Research
    Nature Materials
    Volume: 11, P: 865-871

  • 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

  • This study has developed a time-resolved measurement set-up in which strong light–matter coupling can be switched on in a semiconductor quantum-well structure as fast as within one cycle of light. This makes it possible to monitor directly how a population of bare photons is converted to polaritons, mixed light–matter modes.

    • G. Günter
    • A. A. Anappara
    • R. Huber
    Research
    Nature
    Volume: 458, P: 178-181

  • 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

  • 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

  • Experimental observation of intersubband transitions in van der Waals quantum wells is enabled by high spatial resolution imaging through near-field optical microscopy.

    • Peter Schmidt
    • Fabien Vialla
    • Frank H. L. Koppens
    Research
    Nature Nanotechnology
    Volume: 13, P: 1035-1041

  • Many researchers hope to merge plasmonics and graphene photonics to combine their useful features. The properties and characteristics of plasmons on graphene are reviewed. Prospects for possible future applications are discussed.

    • A. N. Grigorenko
    • M. Polini
    • K. S. Novoselov
    Reviews
    Nature Photonics
    Volume: 6, P: 749-758