TY - JOUR
T1 - Tuning of Plasmon Resonance Through Gold Slit Arrays with Y-Shaped Channels
AU - Wu , Jin-Jun
AU - Li , Hong-Jian
AU - Zeng , Yong
AU - Peng , Xiao
AU - Liu , Zhi-Min
AU - Cao , Guang-Tao
JO - Journal of Atomic and Molecular Sciences
VL - 4
SP - 344
EP - 352
PY - 2012
DA - 2012/03
SN - 3
DO - http://doi.org/10.4208/jams.102711.112911a
UR - https://global-sci.org/intro/article_detail/jams/8214.html
KW - Y-shape channel slit array, optical transmission, surface plasmon resonance, localized waveguide resonance.
AB - <p style="text-align: justify;">We propose gold slit arrays with Y-shaped channels and investigate their transmission properties numacially. Results indicate that the surface plasmon resonance peak value keeps unchanged and the localized waveguide resonance peak red-shifts and falls obviously when the entrance slit width narrows. However when the entrance slit becomes extremely small the surface plasmon resonance peak red-shifts and falls sharply. Furthermore as the slit length increases, firstly the surface plasmon resonance peak splits into two peaks, the right peak value rise and they slowly converged into one single peak. To understand its physical origin, surface plasmon resonance and Fabry-Perot cavity resonance theories are suggested. We simulate their electric field distributions and find the electric fields become stronger as the slit become narrower or the dielectric constant become smaller. The results may be useful for the design of frequency-selective sensor and optical devices in the future.</p>