Browsing Luonnontieteiden, metsätieteiden ja tekniikan tiedekunta by Author "Friberg, Ari T"

Now showing items 21-39 of 39

    • Polarimetric nonregularity of evanescent waves 

      Norrman, Andreas; Gil, Jose J; Friberg, Ari T; Setälä, Tero (The Optical Society of America, 2019)
      Three-dimensional polarization states of random light can be classified into regular and nonregular according to the structure of the related 3×3 polarization matrix. Here we show that any purely evanescent wave excited ...
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    • Polarimetric purity and the concept of degree of polarization 

      Gil, Jose J; Norrman, Andreas; Friberg, Ari T; Setälä, Tero (American Physical Society (APS), 2018)
      The concept of degree of polarization for electromagnetic waves, in its general three-dimensional version, is revisited in the light of the implications of the recent findings on the structure of polarimetric purity and ...
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    • Polarization dependent beaming properties of a plasmonic lattice laser 

      Asamoah, Benjamin O; Partanen, Henri; Mohamed, Sughra; Heikkinen, Janne; Halder, Atri; Koivurova, Matias; Necada, Marek; Setälä, Tero; Turunen, Jari; Friberg, Ari T; Hakala, Tommi K (IOP Publishing, 2021)
      We study beaming properties of laser light produced by a plasmonic lattice overlaid with organic fluorescent molecules. The crossover from spontaneous emission regime to stimulated emission regime is observed in response ...
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    • Polarization modulation by surface plasmons in Young's double-slit setup 

      Leinonen, Aleksi; Saastamoinen, Kimmo; Pesonen, Henri; Wu, Gaofeng; Visser, Taco D; Turunen, Jari; Friberg, Ari T (American Physical Society (APS), 2021)
      A simple phenomenological model, justified by rigorous electromagnetic analysis, is used to examine far-field polarization modulation introduced by a metallic screen with two subwavelength slits in uniform, partially ...
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    • Probing coherence Stokes parameters of three-component light with nanoscatterers 

      Guo, Mengwen; Norrman, Andreas; Friberg, Ari T; Setälä, Tero (The Optical Society of America, 2022)
      We establish a method to determine the spectral coherence Stokes parameters of a random three-component optical field via scattering by two dipolar nanoparticles. We show that measuring the intensity and polarization-state ...

    • Probing the Electromagnetic Degree of Coherence of Light Beams with Nanoscatterers 

      Saastamoinen, Kimmo; Partanen, Henri; Friberg, Ari T; Setälä, Tero (American Chemical Society (ACS), 2020)
      Highly nonparaxial electromagnetic fields are increasingly met in modern nanophotonics. Their characterization is vital, but the traditional beam-field methods are not applicable. In this work we demonstrate a novel technique ...
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    • Scattering of partially coherent surface plasmon polariton fields by metallic nanostripe 

      Daniel, Salman; Saastamoinen, Kimmo; Ponomarenko, Sergey A; Friberg, Ari T (Springer Nature, 2019)
      Background Surface plasmon polaritons (SPPs) are electromagnetic waves that propagate at a metal-dielectric interface. Until recently, monochromatic, fully coherent SPPs have mainly been considered. Methods We investigate ...
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    • Sets of orthogonal three-dimensional polarization states and their physical interpretation 

      Gil, Jose J; San Jose, Ignacio; Norrman, Andreas; Friberg, Ari T; Setälä, Tero (American Physical Society (APS), 2019)
      The spectral and characteristic decompositions of the polarization matrix provide fruitful frameworks for the physical interpretation of three-dimensional (3D) partially polarized light fields. The decompositions are ...
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    • Spatial coherence effects in second-harmonic generation of scalar light fields 

      Pesonen, Henri; Halder, Atri; Huusko, Juha-Matti; Friberg, Ari T; Setälä, Tero; Turunen, Jari (IOP Publishing, 2021)
      We consider the spectral spatial coherence characteristics of scalar light fields in second-harmonic generation in an optically non-linear medium. Specifically, we take the fundamental-frequency (incident) field to be a ...
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    • Spatial coherence of light measured by nanoscattering 

      Saastamoinen, Kimmo; Leppänen, Lasse-Petteri; Vartiainen, Ismo; Friberg, Ari T; Setälä, Tero (The Optical Society, 2018)
      As complex random electromagnetic fields are increasingly exploited in advanced photonics, the measurement of their statistical properties emerges as a crucial technical issue. For spatial coherence, we employ dipole ...
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    • Spectral invariance and scaling law for nonstationary optical fields 

      Ding, Chaoliang; Koivurova, Matias; Setälä, Tero; Turunen, Jari; Friberg, Ari T (American Physical Society (APS), 2020)
      We develop a scaling law for a class of statistically nonstationary scalar optical fields, which ensures spectral invariance on their propagation into the far zone of a planar source. The invariance involves the constraint ...
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    • Spectral measurement of coherence Stokes parameters of random broadband light beams 

      Partanen, Henri; Friberg, Ari T; Setälä, Tero; Turunen, Jari (Optical Society of America, 2019)
      We introduce a spectrally resolved Young’s interferometer based on a digital micromirror device, a grating spectrometer, and a set of polarization-modulation elements to measure the spectral coherence (two-point) Stokes ...
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    • Spectral scale transformations of nonstationary optical fields 

      Laatikainen, Jyrki; Koivurova, Matias; Turunen, Jari; Setälä, Tero; Friberg, Ari T (American Physical Society, 2022)
      The notions of cross-spectral purity and spectral invariance of light impose specific structures for the field coherence. Such concepts were originally introduced for stationary light and recently extended to nonstationary ...

    • Spin density in partially coherent surface-plasmon-polariton vortex fields 

      Chen, Yahong; Norrman, Andreas; Ponomarenko, Sergey A; Friberg, Ari T (American Physical Society, 2021)
      We examine the spin angular momentum (SAM) density associated with the recently introduced [Phys. Rev. A 100, 053833 (2019)], partially coherent surface-plasmon-polariton (SPP) vortex fields at a metal-air interface. We ...
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    • Spin of random stationary light 

      Gil, Jose J; Norrman, Andreas; Friberg, Ari T; Setälä, Tero (American Physical Society, 2023)
      We develop a theoretical foundation for the spin angular momentum (SAM) of random, statistically stationary polychromatic light fields within the framework of classical optical coherence theory. The formulation is valid ...

    • Structure of transverse spin in focused random light 

      Chen, Yahong; Wang, Fei; Dong, Zhen; Cai, Yangjian; Norrman, Andreas; Gil, José J; Friberg, Ari T; Setälä, Tero (American Physical Society (APS), 2021)
      We analyze the spin structure of weakly and tightly focused random light beams in view of the characteristic decomposition of the 3×3 polarization matrix. We take the incident beam to be a mixture of mutually uncorrelated, ...
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    • Temporal phase-contrast ghost imaging 

      Hannonen, Antti; Shevchenko, Andriy; Friberg, Ari T; Setälä, Tero (American Physical Society (APS), 2020)
      We introduce a phase-contrast ghost-imaging scheme for the characterization of temporal phase objects in terms of intensity correlations at two photodetectors. The technique is analogous to Zernike's phase-contrast imaging ...
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    • Two-point polarization correlations of random paraxial and nonparaxial electromagnetic fields 

      Guo, Mengwen; Mao, Haidan; Zhao, Daomu; Friberg, Ari T; Setälä, Tero (American Physical Society (APS), 2021)
      We investigate the two-point polarization correlation properties of random, statistically stationary, two-dimensional (2D) and three-dimensional (3D) electromagnetic fields. To this end two specific mutual polarization ...
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    • Young's interference experiment with electromagnetic narrowband light 

      Partanen, Henri; Hoenders, Bernhard J; Friberg, Ari T; Setälä, Tero (The Optical Society of America, 2018)
      We consider electromagnetic spectral spatial coherence of random stationary light beams of arbitrary spectral width. We demonstrate that the normalized spectral coherence (or two-point) Stokes parameters and the electromagnetic ...
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