19 October 2004 Exceptional linear and nonlinear optical properties of low-symmetry metal nanoparticle arrays
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Recent interest in the study of metal nanoparticles and related structures has greatly increased. Technologies such as electron beam lithography facilitate the fabrication of such subwavelength structures. Much research has focused on the linear optical properties of high-symmetry particles, such as ellipsoids and spheroids. However, we focus on both the linear and nonlinear optical responses of low-symmetry L-shaped nanoparticles. We show that these nanoparticle arrays are exceptionally sensitive to polarization. Small asymmetries in the particle shapes lead to large deviations in the primary extinction directions from expected locations. The structural asymmetries may also induce optical activity. We present results of detailed polarization analysis through second-harmonic generation experiments that are based on symmetry arguments regarding the second-order susceptibility tensor. The results confirm that the structural deviations from the ideal shape lead to further breakdown in the symmetry properties of the arrays.
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Brian K. Canfield, Brian K. Canfield, Sami Kujala, Sami Kujala, Konstantins Jefimovs, Konstantins Jefimovs, Tuomas Vallius, Tuomas Vallius, Jari Turunen, Jari Turunen, Martti Kauranen, Martti Kauranen, "Exceptional linear and nonlinear optical properties of low-symmetry metal nanoparticle arrays", Proc. SPIE 5512, Plasmonics: Metallic Nanostructures and Their Optical Properties II, (19 October 2004); doi: 10.1117/12.555762; https://doi.org/10.1117/12.555762

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