Tunable plasmonic resonances in Si-Au slanted columnar heterostructure thin films

Ufuk Kılıç, Alyssa Mock, René Feder, Derek Sekora, Matthew Hilfiker, Rafał Korlacki, Eva Schubert, Christos Argyropoulos, Mathias Schubert

Research output: Contribution to journalArticle

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Abstract

We report on fabrication of spatially-coherent columnar plasmonic nanostructure superlattice-type thin films with high porosity and strong optical anisotropy using glancing angle deposition. Subsequent and repeated depositions of silicon and gold lead to nanometer-dimension subcolumns with controlled lengths. We perform generalized spectroscopic ellipsometry measurements and finite element method computations to elucidate the strongly anisotropic optical properties of the highly-porous Si-Au slanted columnar heterostructures. The occurrence of a strongly localized plasmonic mode with displacement pattern reminiscent of a dark quadrupole mode is observed in the vicinity of the gold subcolumns. We demonstrate tuning of this quadrupole-like mode frequency within the near-infrared spectral range by varying the geometry of Si-Au slanted columnar heterostructures. In addition, coupled-plasmon-like and inter-band transition-like modes occur in the visible and ultra-violet spectral regions, respectively. We elucidate an example for the potential use of Si-Au slanted columnar heterostructures as a highly porous plasmonic sensor with optical read out sensitivity to few parts-per-million solvent levels in water.

Original languageEnglish (US)
Article number71
JournalScientific Reports
Volume9
Issue number1
DOIs
StatePublished - Dec 1 2019

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Gold
Nanostructures
Porosity
Anisotropy
Silicon
Water

ASJC Scopus subject areas

  • General

Cite this

Tunable plasmonic resonances in Si-Au slanted columnar heterostructure thin films. / Kılıç, Ufuk; Mock, Alyssa; Feder, René; Sekora, Derek; Hilfiker, Matthew; Korlacki, Rafał; Schubert, Eva; Argyropoulos, Christos; Schubert, Mathias.

In: Scientific Reports, Vol. 9, No. 1, 71, 01.12.2019.

Research output: Contribution to journalArticle

Kılıç, U, Mock, A, Feder, R, Sekora, D, Hilfiker, M, Korlacki, R, Schubert, E, Argyropoulos, C & Schubert, M 2019, 'Tunable plasmonic resonances in Si-Au slanted columnar heterostructure thin films', Scientific Reports, vol. 9, no. 1, 71. https://doi.org/10.1038/s41598-018-37153-x
Kılıç U, Mock A, Feder R, Sekora D, Hilfiker M, Korlacki R et al. Tunable plasmonic resonances in Si-Au slanted columnar heterostructure thin films. Scientific Reports. 2019 Dec 1;9(1). 71. https://doi.org/10.1038/s41598-018-37153-x
Kılıç, Ufuk ; Mock, Alyssa ; Feder, René ; Sekora, Derek ; Hilfiker, Matthew ; Korlacki, Rafał ; Schubert, Eva ; Argyropoulos, Christos ; Schubert, Mathias. / Tunable plasmonic resonances in Si-Au slanted columnar heterostructure thin films. In: Scientific Reports. 2019 ; Vol. 9, No. 1.
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