Thin-film-based field penetration engineering for surface plasmon resonance biosensing.
Penetration depth defines the measurable range in evanescent-wave-based sensing techniques such as surface plasmon resonance (SPR). We investigate penetration depth variation implemented with dielectric layers in a SPR sensing structure. The results show that the penetration depth can be controlled to increase or decrease depending on a specific configuration. Effective medium theory was introduced to describe the field penetration in dielectric multilayer designs. Comparison was made with the field penetration of a localized SPR structure based on periodic nanowires. The penetration depth variation in response to environmental changes was also explored.
Yoon
Soon Joon
SJ
School of Electrical and Electronic Engineering, Yonsei University, Seoul, Korea.
Kim
Donghyun
D