Now showing items 1-7 of 7

    • Direct observation of ultraslow hyperbolic polariton propagation with negative phase velocity 

      Yoxall, Edward; Schnell, Martin; Nikitin, Alexey Y.; Txoperena, Oihana; Woessner, Achim; Lundeberg, Mark B.; Casanova, Félix; Hueso, Luis E.; Koppens, Frank H. L.; Hillenbrand, Rainer (Nature Publishing Group, 2015-09-14)
      Article
      Restricted access - publisher's policy
      Polaritons with hyperbolic dispersion are key to many emerging photonic technologies, including subdiffraction imaging, sensing and spontaneous emission engineering1, 2, 3, 4, 5, 6, 7, 8. Fundamental to their effective ...
    • Exploring flatland nano-optics with graphene plasmons 

      Woessner, Achim (Universitat Politècnica de Catalunya, 2017-05-11)
      Doctoral thesis
      Open Access
      Plasmons are charge oscillations coupled to electromagnetic radiation. One of their most intriguing properties is their deep subwavelength confinement resulting in strongly enhanced light-matter interaction. Metal plasmons ...
    • Generation of photovoltage in graphene on a femtosecond timescale through efficient carrier heating 

      Tielrooij, K. J.; Piatkowski, L.; Massicotte, M.; Woessner, Achim; Ma, Q.; Lee, Y.; Myhro, K. S.; Lau, C. N.; Jarillo-Herrero, P.; Hulst, N. F. van; Koppens, F. H. L. (Nature, 2015-04-13)
      Article
      Open Access
      Graphene is a promising material for ultrafast and broadband photodetection. Earlier studies have addressed the general operation of graphene-based photothermoelectric devices and the switching speed, which is limited by ...
    • Highly confined low-loss plasmons in graphene–boron nitride heterostructures 

      Woessner, Achim; Lundeberg, Mark B.; Gao, Yuanda; Principi, Alessandro; Alonso-González, Pablo; Carrega, Matteo; Watanabe, Kenji; Taniguchi, Takashi; Vignale, Giovanni; Polini, Marco; Hone, James; Hillenbrand, Rainer; Koppens, Frank H.L. (Nature Publishing Group, 2014-12-22)
      Article
      Open Access
      Graphene plasmons were predicted to possess simultaneous ultrastrong field confinement and very low damping, enabling new classes of devices for deep-subwavelength metamaterials, single-photon nonlinearities, extraordinarily ...
    • Hot-carrier photocurrent effects at graphene–metal interfaces 

      Tielrooij, K. J.; Massicotte, M.; Piatkowski, L.; Woessner, Achim; Ma, Q.; Jarillo-Herrero, P.; Hulst, N. F. van; Koppens, F. H. L. (IOP, 2015-03-02)
      Article
      Open Access
      Photoexcitation of graphene leads to an interesting sequence of phenomena, some of which can be exploited in optoelectronic devices based on graphene. In particular, the efficient and ultrafast generation of an electron ...
    • Plasmonically enhanced light absorption in graphene nanoribbons 

      Woessner, Achim (Universitat Politècnica de Catalunya, 2012-09-06)
      Master thesis
      Open Access
      [ANGLÈS] Light absorption plays a crucial role in both optical detectors and photovoltaics. In order to improve the light absorption properties of materials different measures can be taken. This thesis considers light ...
    • Thermoelectric detection and imaging of 1 propagating graphene plasmons 

      Lundeberg, Mark B.; Gao, Yuanda; Woessner, Achim; Tan, Cheng; Alonso-González, Pablo; Watanabe, Kenji; Taniguchi, Takashi; Hone, James; Hillenbrand, Rainer; Koppens, Koppens (Nature, 2016-09-19)
      Article
      Open Access
      Controlling, detecting and generating propagating plasmons by all-electrical means is at the heart of on-chip nano-optical processing1, 2, 3. Graphene carries long-lived plasmons that are extremely confined and controllable ...