Design study for transmission improvement of resonant surface plasmons using dielectric diffraction gratings.
A transmission-type surface plasmon resonance configuration with dielectric gratings regularly patterned on a silver film was investigated with the aim of enhancing the diffraction efficiency of radiative surface plasmons. The theoretical work was conducted using rigorous coupled-wave analysis in terms of first order diffraction efficiency and conversion efficiency (CE). The results show that pyramid gratings can produce a higher transmittance compared with other grating profiles. Design optimization of the pyramid grating at a wide range of grating thicknesses and periods resulted in a maximum transmittance that was larger than 77% and a peak CE of about 85%. This study demonstrates the potential of using transmitted surface plasmon waves in various optical devices, such as optical biosensors, optical imaging systems, and polarization filters.
Choi
Seung Ho
SH
Interdisciplinary Program of Bioengineering, Seoul National University, Seoul, South Korea 152-742.
Kim
Sung June
SJ
Byun
Kyung Min
KM
D008962:Models, Theoretical; D055096:Optical Devices / Q000706:statistics & numerical data; D055620:Optical Phenomena; D020349:Surface Plasmon Resonance / Q000295:instrumentation / Q000379:methods* / Q000706:statistics & numerical data