Robustness of plasmonic angular momentum confinement in cross resonant optical antennas

Using a combination of photoemission electron microscopy and numerical simulations, we investigated the angular moment transfer in strongly enhanced optical near-fields of artificially fabricated optical antennas. The polarization dependence of the optical near-field enhancement has been measured in a maximum symmetric geometry, i.e., excitation by a normal incident planar wave. Finite-difference time-domain simulations for the realistic antenna geometries as determined by high-resolution electron microscopy reveal a very good agreement with experimental data. The agreement confirms that the geometrical asymmetries and inhomogeneities due to the nanoscale fabrication process preserve the circular polarization in the gap regions with strong near-field enhancement.

[1]  Multimode plasmon excitation and in situ analysis in top-down fabricated nanocircuits. , 2013, Physical review letters.

[2]  G. Schönhense.  Circular Dichroism and Spin Polarization in Photoemission from Adsorbates and Non-Magnetic Solids , 1990 .

[3]  G. Schönhense,et al.  Near field of strongly coupled plasmons: uncovering dark modes. , 2012, Nano letters.

[4]  G. Schönhense,et al.  Spin-polarized photoelectrons resonantly excited by circularly polarized light from a fractional Ag film on GaAs(100) , 2013 .

[5]  H. Misawa,et al.  Direct imaging of the near field and dynamics of surface plasmon resonance on gold nanostructures using photoemission electron microscopy , 2013, Light: Science & Applications.

[6]  K. Aulenbacher,et al.  Measurement of strange quark contributions to the vector form factors of the proton at Q2 = 0.22 (GeV / c)2. , 2009, Physical review letters.

[7]  Emil Prodan,et al.  Plasmon Hybridization in Nanoparticle Dimers , 2004 .

[8]  Gordon S. Kino,et al.  Gap-Dependent Optical Coupling of Single “Bowtie” Nanoantennas Resonant in the Visible , 2004 .

[9]  G. Schönhense,et al.  Manipulating near field polarization beyond the diffraction limit , 2011 .

[10]  Michael Bauer,et al.  Adaptive subwavelength control of nano-optical fields , 2007, Nature.

[11]  P. Schuck,et al.  Elucidating heterogeneity in nanoplasmonic structures using nonlinear photon localization microscopy , 2014 .

[12]  K. Kajikawa,et al.  Evaluation of gap distance between gold nanospheres and a gold substrate by absorption spectroscopy , 2009 .

[13]  C. Ropers,et al.  Field-driven photoemission from nanostructures quenches the quiver motion , 2012, Nature.

[14]  M Finazzi,et al.  Cross resonant optical antenna. , 2009, Physical review letters.

[15]  Lukas Novotny,et al.  Principles of Nano-Optics by Lukas Novotny , 2006 .

[16]  T. Rasing,et al.  All-optical magnetic recording with circularly polarized light. , 2007, Physical review letters.

[17]  F. Meyer Zu Heringdorf,et al.  Normal-Incidence Photoemission Electron Microscopy (NI-PEEM) for Imaging Surface Plasmon Polaritons , 2014, Plasmonics.

[18]  P. Nordlander,et al.  Plasmonic structure and electromagnetic field enhancements in the metallic nanoparticle-film system , 2006 .

[19]  U. Fano.  Spin Orientation of Photoelectrons Ejected by Circularly Polarized Light , 1969 .

[20]  R. W. Christy,et al.  Optical Constants of the Noble Metals , 1972 .

[21]  N. Buckanie,et al.  Interaction of light and surface plasmon polaritons in Ag islands studied by nonlinear photoemission microscopy. , 2013, Ultramicroscopy.

[22]  Leiming Wang,et al.  Focusing surface plasmon polariton wave packets in space and time , 2013 .

[23]  G. Schönhense,et al.  Time-resolved two photon photoemission electron microscopy , 2002 .

[24]  R. Könenkamp,et al.  Direct coupling of photonic modes and surface plasmon polaritons observed in 2-photon PEEM. , 2013, Optics express.

[25]  P. Nordlander,et al.  A Hybridization Model for the Plasmon Response of Complex Nanostructures , 2003, Science.

[26]  F. Krausz,et al.  Controlled near-field enhanced electron acceleration from dielectric nanospheres with intense few-cycle laser fields , 2011 .

[27]  Ichirou Yamaguchi,et al.  Optical Absorption Study of the Surface Plasmon Resonance in Gold Nanoparticles Immobilized onto a Gold Substrate by Self-Assembly Technique , 2003 .

[28]  Urs Sennhauser,et al.  Atomically flat single-crystalline gold nanostructures for plasmonic nanocircuitry. , 2010, Nature communications.

[29]  Zhijun Sun,et al.  Femtosecond imaging of surface plasmon dynamics in a nanostructured silver film. , 2005, Nano letters.