Randomization of gold nano-brick arrays: A tool for SERS enhancement

Optics Express

Volumn 21, Issue 11, 2013, Pages 13502-13514

  Nishijima, Yoshiaki ^a   Khurgin, Jacob B ^b   Rosa, Lorenzo ^c   Fujiwara, Hideki ^d   Juodkazis, Saulius ^c  

^a YOKOHAMA NATIONAL UNIVERSITY   (Japan)

^b Johns Hopkins University   (United States)

^c SWINBURNE UNIVERSITY OF TECHNOLOGY   (Australia)

^d HOKKAIDO UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

ASPECT RATIO; NANOPARTICLES; RAMAN SPECTROSCOPY; RANDOM PROCESSES; SURFACE SCATTERING;

EXPERIMENTAL OBSERVATION; LONGITUDINAL MODES; PERIODIC PATTERN; PLASMONIC NANOPARTICLE; POLARIZATION-SELECTIVITY; RECTANGULAR PARALLELEPIPEDS; SERS ENHANCEMENT; SURFACE ENHANCED RAMAN SCATTERING (SERS);

BRICK;

EID: 84878877563     PISSN: None     EISSN: 10944087     Source Type: Journal    
DOI: 10.1364/OE.21.013502     Document Type: Article

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33. For example, consider a one-dimensional intensity distribution I1(x), having constant value 1 for 0 < x < 10, and a second distribution I2(x) having value 0.8 for 0 < x < 8 and 1.8 for 8 < x < 10. While the two distributions have the same average I1= I2= 1, I2(x) is clearly less uniform than I1(x). This is reflected in the greater value of the variance estimator I2 2 /-I2-2=1.16 with respect to I2 1 /-I1-2=1. In order to maximize its value the distribution should have a high degree of non-uniformity, which can be slightly increased by mixing nano-bricks with high aspect ratio, while it is the greatest (thus high enhancement) for a random distribution. When R is increased, for the T-mode the non-uniformity is increased and the wavelength decreased, both of which favor an increase in Raman scattering relative to extinction (as the Raman scattering cross-section is proportional to 1/⌊ 4). For the L-mode, both non-uniformity and wavelength increase, thus the two factors compensate each other, reducing the growth of Raman intensity with R.
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