Tunable Raman Selectivity via Randomization of a Rectangular Pattern of Nanodisks | Zendy

Yoshiaki Nishijima | Zendy; Jacob B. Khurgin | Zendy; Lorenzo Rosa | Zendy; Hideki Fujiwara | Zendy; Saulius Juodkazis | Zendy

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Tunable Raman Selectivity via Randomization of a Rectangular Pattern of Nanodisks

Author(s) -

Yoshiaki Nishijima,

Jacob B. Khurgin,

Lorenzo Rosa,

Hideki Fujiwara,

Saulius Juodkazis

Publication year - 2014

Publication title -

acs photonics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.735

H-Index - 89

ISSN - 2330-4022

DOI - 10.1021/ph500228s

Subject(s) - raman scattering , materials science , raman spectroscopy , polarization (electrochemistry) , optics , extinction ratio , extinction (optical mineralogy) , selectivity , optoelectronics , physics , chemistry , wavelength , biochemistry , catalysis

We show that randomization of a nanodisk array on a rectangular lattice can be used to spectrally tune the surface-enhanced Raman scattering (SERS) intensity and to control the field enhancement. The spectral selectivity of the Raman modes exhibits a nonlinear dependence on the extinction. Randomization of the rectangular pattern brings a favorable increase of SERS intensity via a reduced selectivity and extinction changes at the Stokes band. The extinction dependence for two polarizations on the spacing in the rectangular array is demonstrated. For a given polarizations on the extinction strength depends primarily on the spacing between the nanodisks in the orthogonal direction. Such randomization and polarization control of SERS increases the versatility, e.g., all-optical control, of this important sensing tool

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