Anisotropic plasmonic Cu nanoparticles in sol-gel oxide nanopillars studied by spectroscopic Mueller matrix ellipsometry

Abstract

Broadened plasmon resonances of Cu nanoparticles in nanopatterned mixed oxide sol-gel nanopillars are shown to be readily detected by spectroscopic Mueller matrix ellipsometry. The plasmonic nanomaterials are obtained by low energy ion sputtering of a CuO sol-gel film. Both s- and p-polarized plasmon resonances are observed in the off-block-diagonal and the block-diagonal Mueller matrix elements as well as in the generalized ellipsometric parameters. The resonant features in all elements correlate with both maximum depolarization and a minimum in the reflected intensity. The spectral position and the polarization character of the plasmon resonances are discussed phenomenologically through effective medium theory.

Dispersion and self-orientation of gold nanoparticles in sol–gel hybrid silica – optical transmission properties

“…parallel to the glass surfaces). [36][37] Indeed, the anisotropic host matrix can also make a small shift in the Frolich/Mie resonance condition [36][37] , but the amplitudes of the peaks in ψ small compared to the cases with particle anisotropy. Note that the attenuation described by α p conveys both a component perpendicular and parallel to the sample surface, and its magnitude is also dependent on path length, both dependent on incidence angle.…”

“…This signal can be either a result of a modulation of the Fresnel coefficients at the interfaces which was measured to be a weak effect through reection ellipsometry, or a result of an anisotropic host matrix. 36,37 Indeed, the anisotropic host matrix can also make a small shi in the Frolich/Mie resonance condition, 36,37 but the amplitudes of the peaks in j are small compared to the cases with particle anisotropy. Interestingly, such an optical anisotropy in the host matrix can be envisaged locally around e.g.…”

Broadband Depolarization via Plasmonic Metasurfaces: Conversion from Purely Polarized to Absolute Unpolarized States

“…A unique feature of plasmonic metasurfaces is that their far-field scattering provides key information regarding their near-field properties, paving the way toward harnessing their polarization properties for device applications. − In addition to optical devices, , depolarization observed in the far-field scattering plays an important role in sensing applications, far-field diagnosis, and in the general functionality of metasurfaces. ,, Previous studies have shown that a metasurface platform based on high-contrast dielectric elliptical nanoposts can provide a high degree of control of polarization and phase with subwavelength spatial resolution . Additionally, the possibility of imposing phase profiles also offers new opportunities for metasurface polarization optics …”

A Three Component Self‐Assembled Epitaxial Nanocomposite Thin Film

“…[15][16][17][18][19] For example, metallic Cu nanopillars or nanoparticles in an oxide matrix have been reported for plasmon resonance studies and for battery electrodes. [20][21][22] The vertical nanocomposite fi lms reported to date comprise two different phases, but additional functionalities and crosscoupling of properties may be possible in nanocomposites with more than two phases. Three-phase oxide nanocomposites consisting of La 2 O 3 , SrO, and Co 2 O 3 were reported previously [ 23,24 ] but there has been no report on three-phase nanocomposites showing a vertically oriented epitaxial growth analogous to that seen in two-phase nanocomposites.…”