2020, Articolo in rivista, ENG
Suarez-Forero, D. G.; Riminucci, F.; Ardizzone, V.; De Giorgi, M.; Dominici, L.; Todisco, F.; Lerario, G.; Pfeiffer, L. N.; Gigli, G.; Ballarini, D.; Sanvitto, D.
Exciton-polaritons are mixed light-matter particles offering a versatile solid state platform to study many-body physical effects. In this work, we demonstrate an electrically controlled polariton laser, in a compact, easy-to-fabricate and integrable configuration, based on a semiconductor waveguide. Interestingly, we show that polariton lasing can be achieved in a system without a global minimum in the polariton energy-momentum dispersion. The cavity modes for the laser emission are obtained by adding couples of specifically designed diffraction gratings on top of the planar waveguide, forming an in-plane Fabry-Perot cavity. It is due to the waveguide geometry that we can apply a transverse electric field to finely tune the laser energy and quality factor of the cavity modes. Remarkably, we exploit the system sensitivity to the applied electric field to achieve an electrically controlled population of coherent polaritons. The precise control that can be reached with the manipulation of the grating properties and of the electric field provides strong advantages to this device in terms of miniaturization and integrability, two main features for the future development of coherent sources for polaritonic technologies. (c) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
2019, Articolo in rivista, ENG
Schadler, Kevin G.; Ciancico, Carlotta; Pazzagli, Sofia; Lombardi, Pietro; Bachtold, Adrian; Toninelli, Costanza; Reserbat-Plantey, Antoine; Koppens, Frank H. L.
Solid-state quantum emitters are a mainstay of quantum nanophotonics as integrated single-photon sources (SPS) and optical nanoprobes. Integrating such emitters with active nanophotonic elements is desirable in order to attain efficient control of their optical properties, but it typically degrades the photostability of the emitter itself. Here, we demonstrate a tunable hybrid device that integrates state of the art lifetime-limited single emitters (line width similar to 40 MHz) and 2D materials at subwavelength separation without degradation of the emission properties. Our device's nanoscale dimensions enable ultrabroadband tuning (tuning range >400 GHz) and fast modulation (frequency similar to 100 MHz) of the emission energy, which renders it an integrated, ultracompact tunable SPS. Conversely, this offers a novel approach to optical sensing of 2D material properties using a single emitter as a nanoprobe.