Mengjia Wang :"Spin-orbit interactions for steering Bloch surface waves with the optical magnetic field...."

PhD Works of Mengjia WANG : "Spin-orbit interactions for steering Bloch surface waves w1th the opt1cal magnet1c field and for locally controlling light polarization by swirling surface plasmons

Abstract : My   thesis   is   devoted   to   novel   nano-optical phenomena   and   deviees   based   on   spin-orbit interaction (SOl)  of  light.     First,  magnetic spin- field of  light,  is demonstrated with Bloch surface waves.  lt  provides  a  new  manifestation of the magnetic  light  field. Then, we propose and demonstrate the concept of traveling-wave helical plasmonic antenna (TW-HPA), consisting of a narrow helical gold-coated wire non-radiatively fed with a dipolar nano-antenna. By swirling surface plasmons, the TW-HPA combines subwavelength illumination and polarization transformation.   The TW-HPA is demonstrated  to  radiate  on  the  subwavelength scale  almost  perfectly circularly  polarized  optical waves upon illumination with linearly polarized light. With this  subwavelength plasmonic  antenna,  we developed strongly integrated arrays of point-light emissions  of  opposite  handedness  and  tunable intensities. Finally, by coupling two couples of TW­ HPAs of opposite handedness, we obtained new polarization properties so far unattainable.

Evaluation Committee :  M. Emiliano DESCROVI, Professeur, Politecnico di Torino, Rapporteur.
M. Peter BANZER, Professeur, Max Planck Institute for the Science of Light, Rapporteur.
M. Patrice GENEVET, Chargé de Recherche CNRS, CRHEA, Université Côte d'Azur, Examinateur.
Mme. Maria-Pilar BERNAL, Directeur de Recherche CNRS, Femto-ST, UBFC, Examinateur.
M. Thierry GROSJEAN, Chargé de Recherche CNRS, Femto-ST, UBFC, Directeur de thèse.
M. Nicolas MARTIN, Professeur à ENSMM, Co-directeur de thèse.
Et
M. Roland SALUT, Ingénieur, Femto-ST, UBFC, Invité.
M. Miguel A. SUAREZ, Ingénieur, Femto-ST, UBFC, Invité.

Localization : Ampithéâtre J-J Gagnepain, Bâtiment TEMIS, 15B, Avenue des Montboucons, Besançon