PHYS brown bag seminar: Bose-Einstein condensation in a plasmonic lattice

2018-02-16 12:00:00 2018-02-16 13:00:00 Europe/Helsinki PHYS brown bag seminar: Bose-Einstein condensation in a plasmonic lattice Topic presented by Antti Moilanen (Quantum Dynamics group). Join us for science and pizza in the Nanotalo lobby! http://physics.aalto.fi/en/midcom-permalink-1e7fd254c4387befd2511e7af2e6d222de88e4b8e4b Puumiehenkuja 2, 02150, Espoo

Topic presented by Antti Moilanen (Quantum Dynamics group). Join us for science and pizza in the Nanotalo lobby!

16.02.2018 / 12:00 - 13:00
Nanotalo Lobby, Puumiehenkuja 2, 02150, Espoo, FI

Bose-Einstein condensation is a remarkable manifestation of quantum statistics and macroscopic quantum coherence. Superconductivity and superfluidity have their origin in Bose-Einstein condensation. Ultracold quantum gases have provided condensates close to the original ideas of Bose and Einstein, while condensation of polaritons and magnons have introduced novel concepts of non-equilibrium condensation. 

We demonstrate a Bose-Einstein condensate (BEC) of surface plasmon polaritons in lattice modes of a metal nanoparticle array. Interaction of the nanoscale-confined surface plasmons with a room-temperature bath of dye molecules enables thermalization and condensation in picoseconds. The ultrafast thermalization and condensation dynamics are revealed by an experiment that exploits thermalization under propagation and the open cavity character of the system. A crossover from BEC to usual lasing is realized by tailoring the band structure.