Open AccessLocal enhanced site in surface enhanced infrared absorption with gold nano particle array by Rigorous coupled-wave analysis
Author(s) -
Daichi Mitobe,
Y. Suzuki,
Toru Shimada
Publication year - 2020
Publication title -
journal of physics communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.407
H-Index - 17
ISSN - 2399-6528
DOI - 10.1088/2399-6528/abc9d6
Subject(s) - infrared , plasmon , materials science , absorption (acoustics) , oscillation (cell signaling) , surface plasmon , adsorption , infrared spectroscopy , particle (ecology) , metal particle , nano , localized surface plasmon , nanoparticle , optics , optoelectronics , nanotechnology , chemistry , physics , composite material , biochemistry , organic chemistry , oceanography , geology
Surface enhanced infrared absorption (SEIRA) is a phenomenon by which infrared absorption of molecules adsorbed onto metal evaporated films is greatly enhanced. To clarify the enhancement mechanism in the evaporated films, we simulated the distribution of the enhancement field between Au nano-square columns by rigorous coupled wave analysis (RCWA). No maximum enhancement was observed on the particle surface. This result demonstrates that the first layer effect is not dominant for the increase in this system of columns. Furthermore, the enhanced field oscillates periodically between the particles. This periodic oscillation is not plasmon behavior seen in the visible region. Results indicate the existence of enhancement mechanisms other than plasmons and indicate the possibility that the interference effect enhances infrared absorption.