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Kirjasto - Tampereen teknillinen yliopisto

Browsing Research publications by Issue Date

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  • Wang, Fu Xiang; Rodriguez, Francisco J.; Albers, Willem M.; Ahorinta, Risto; Sipe, J.E.; Kauranen, Martti (2009)
    We use two-beam second-harmonic generation to separate the surface (electric dipole origin) and bulk (magnetic dipole and electric quadrupole origin) contributions to the second-order nonlinear optical response of an ...
  • Volkov, S.N.; Dolgaleva, Ksenia; Boyd, Robert W.; Jefimovs, Konstantins; Turunen, Jari; Svirko, Yuri; Canfield, Brian K.; Kauranen, Martti (2009)
    We prepare diffractive planar arrays of metal nanoparticles that are chiral because of either the shape of individual particles (“molecular” chirality) or the orientation of achiral particles in the array (“structural” ...
  • Priimägi, Arri; Shevchenko, Andriy; Kaivola, Matti; Rodriguez, Francisco J.; Kauranen, Martti; Rochon, Paul (2010)
    We present a novel materials concept for optical inscription of stable birefringent optical elements into guest–host type polymers by making use of chromophore aggregation. The method is based on photoalignment of azobenzene ...
  • Wang, Fu Xiang; Siltanen, Mikael; Kauranen, Martti (2007)
    Second-harmonic generation from surfaces and thin films can be described by up to three nonlinear expansion coefficients, which are associated with the quadratic combinations of the p- and s-polarized components of the ...
  • Kujala, Sami; Canfield, Brian K.; Kauranen, Martti; Svirko, Yuri; Turunen, Jari (2007)
    We provide experimental evidence of higher multipole (magnetic dipole and electric quadrupole) radiation in second-harmonic (SH) generation from arrays of metal nanoparticles. Fundamental differences in the radiative ...
  • Rao, Satish; Huttunen, Mikko J.; Kontio, Juha M.; Mäkitalo, Jouni; Viljanen, Milla-Riina; Simonen, Janne; Kauranen, Martti; Petrov, Dmitri (2010)
    We present two silver nanocones separated by 450 nm, well beyond the typical gap spacing of coupled nanoantennas, and connected by a metal bridge to facilitate plasmonic coupling between them. The tip-enhanced Raman ...
  • Kujala, Sami; Canfield, Brian K.; Kauranen, Martti; Svirko, Yuri; Turunen, Jari (2008)
    We present a multipolar tensor analysis of second-harmonic radiation from arrays of noncentrosymmetric L-shaped gold nanoparticles. Our approach is based on the fundamental differences in the radiative properties of electric ...
  • Saari, A.; Genty, G.; Siltanen, M.; Karvinen, P.; Vahimaa, P.; Kuittinen, M.; Kauranen, M. (2010)
    We demonstrate a purely dielectric resonant waveguide structure that enhances the efficiency of second-harmonic generation by a factor of at least 5500 compared to a flat reference surface in the same geometry. We also ...
  • Husu, Hannu; Mäkitalo, Jouni; Laukkanen, Janne; Kuittinen, Markku; Kauranen, Martti (2010)
    We present an extensive experimental and theoretical study of the particle plasmon resonances of L-shaped gold nanoparticles. For the small characteristic size of the particles, we observe more higher-order resonances than ...
  • Siltanen, Mikael; Leivo, Samuli; Voima, Pauliina; Kauranen, Martti; Karvinen, Petri; Vahimaa, Pasi; Kuittinen, Markku (2007)
    The authors demonstrate that a dielectric resonant waveguide grating can enhance optical second-harmonic generation by a factor of 550 compared to a similar flat surface. Their structure, which consists of purely dielectric ...
  • Canfield, Brian K.; Kujala, Sami; Laiho, Kaisa; Jefimovs, Konstantins; Turunen, Jari; Kauranen, Martti (2006)
    The symmetry of metal nanostructures may be broken by their overall features or small-scale defects. To separate the roles of these two mechanisms in chiral symmetry breaking, we prepare gold nanostructures with chirality ...
  • Cattaneo, Stefano; Kauranen, Martti (2005)
    We show that bulk and surface contributions in second-order surface nonlinear optics of isotropic materials can be identified unambiguously in a single measurement by their polarization signatures. The signatures follow ...
  • Cattaneo, Stefano; Kauranen, Martti (2003)
    We measure the susceptibility components of a poled polymer film by second-harmonic generation with two beams at the fundamental frequency. The technique allows the consistency of experimental data and the validity of the ...
  • Canfield, Brian K.; Husu, Hannu; Kontio, Juha; Viheriälä, Jukka; Rytkönen, Tuomo; Niemi, Tapio; Chandler, Eric; Hrin, Alex; Squier, Jeff A.; Kauranen, Martti (2008)
    We use second- and third-harmonic-generation microscopy to address the tensorial nonlinear responses of individual particles in an array of cylindrical gold nanodots. The responses in both orders exhibit widely-variable, ...
  • Wang, Fu Xiang; Rodriguez, Francisco J.; Albers, Willem M.; Kauranen, Martti (2010)
    Gold films of 20 and 150 nm nominal thickness were characterized by two-beam second-harmonic generation to address their second-order nonlinear optical responses of surface (dipolar) and bulk (higher multipolar) origin. ...
  • Syrjälä, Ville; Valkama, Mikko (2010)
    This article addresses the analysis and digital signal processing (DSP)-based mitigation of phase noise and sampling clock jitter in orthogonal frequency division multiplexing (OFDM) radios. In the phase noise studies, the ...
  • Syrjälä, Ville; Valkama, Mikko (2010)
    This paper addresses the sampling jitter estimation and cancellation task in direct RF sub-sampling type radios. The proposed jitter estimation method is based on carefully injecting or superimposing an additional known ...
  • Rezaei, Mehdi; Bouazizi, Imed; Gabbouj, Moncef (2009)
    A novel technique for implementing statistical multiplexing (StatMux) of broadcast services over Digital Video Broadcasting for Handhelds (DVB-H) channels is proposed. DVB-H uses a time-sliced transmission scheme to reduce ...
  • Rezaei, Mehdi; Bouazizi, Imed; Gabbouj, Moncef (2009)
    Digital video broadcast-terrestrial 2 (DVB-T2) is the successor of DVB-T standard that allows a two-dimensional multiplexing of broadcast services in time and frequency domains. It introduces an optional time-frequency ...
  • Vuorela, Timo; Catte, Andrea; Niemelä, Perttu S.; Hall, Anette; Hyvönen, Marja T.; Marrink, Siewert-Jan; Karttunen, Mikko; Vattulainen, Ilpo (2010)
    We study the structure and dynamics of spherical high density lipoprotein (HDL) particles through coarse-grained multi-microsecond molecular dynamics simulations. We simulate both a lipid droplet without the apolipoprotein ...