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The light at the end of the tunnel: Nanophotonics with STM

Prof. Roberto Otero
Facultad de Ciencias UAM, IMDEA Nanociencia
Viernes, 12 Marzo 2021 12:30

Online seminar: "The light at the end of the tunnel: Nanophotonics with STM"

   Dpto. de Física de la Materia Condensada
   Prof. Roberto Otero, Facultad de Ciencias, UAM
   Evento online, MS-TEAMS, “Seminarios del Departamento”

   Light-matter interactions at the nanoscale show a very rich physical
   phenomenology with potential for new and disruptive applications in
   fields as diverse as quantum computation, catalysis or ultrasentive
   biosensors. For example, when light is confined in nanometer-scale
   gaps between two metal surfaces, and individual quantum emitters are
   placed in the gap, the light and matter excitations can become
   inextricably coupled, leading to very interesting effects such as
   Rabi oscillations and splitting, which can be used to generate
   entangled photons for quantum cryptography, or to promote specific
   chemical reactions through the modification of molecular excited
   states. In this context, luminescence excited by injection of a
   tunnel current in the gap between the tip and the sample of a
   Scanning Tunnelling Microscope (STM) is emerging as a promising
   technique, enabling the characterization of the optical properties
   of quantum emitters at solid surfaces even with submolecular
   resolution. However, there is a notable lack of understanding of the
   physical principles that control the luminescence produced by
   tunnelling electrons, which is a severe drawback for this technique
   to become relevant in the field of Nanophotonics.

   In this seminar I will offer an introductory view of the interesting
   new optical phenomena that appear in nanoscale systems, with
   emphasis on those that have been explored by state-of-the-art STM
   luminescence. I will show the enormous successes already achieved by
   this technique, such as measuring Raman signals with intramolecular
   resolution, or measuring the optical response of custom designed
   systems built molecule by molecule; but I will also describe the
   many intriguing mysteries that still remain controversial. I will
   finish by describing our own recent efforts to unravel such
   mysteries, including our realization of the role for
   electronic-structure factors in plasmonic spectra, our measure of
   the temperature dynamics induced by single-electron injection, or
   our recent success to detect optical resonances in single molecules
   adsorbed on metal surfaces.

 Website: https://www.uam.es/Ciencias/Light/1446814764050.htm?language=es&pid=1446741889119&title=Seminario:%20%22The%20light%20at%20the%20end%20of%20the%20tunnel:%20Nanophotonics%20with%20STM%22

LINK (TEAMS): https://teams.microsoft.com/l/team/19%3a06c9091119dd4784a4f85b8f63072f04%40thread.tacv2/conversations?groupId=dbe208af-15b8-45e7-b965-eaa7c4833d33&tenantId=fc6602ef-8e88-4f1d-a206-e14a3bc19af2