Admittance loci design method for multilayer surface plasmon resonance devices

Chii Wann Lin*, Kuo-Ping Chen, Min Chi Su, Tzu-Chien Hsiao, Sue Sheng Lee, Shiming Lin, Xue jing Shi, Chih Kung Lee

*Corresponding author for this work

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

Dielectric mirror types of multilayer structures have been applied to enhance the performance of surface plasmon resonance (SPR) devices. It demands a more robust design method than traditional Fresnel's equations. An admittance locus is a kind of optical thin film design method which has been extensively used for high performance optical coatings. We have applied this method for the design of multilayer SPR devices, including symmetric (glass|Au(40 nm)-[TiO2(20 nm)-SiO2(20 nm)]4-Au(30 nm)) and asymmetric (glass|Ag(50 nm)-[TiO2(20 nm)-SiO2(20 nm)]4-Au(20 nm)) structure. It provides a much necessary guidance for the choices of suitable optical materials, thickness, and number of layers for the intended SPR performance. With a 633 nm light source and a BK7 coupling prism under water, one can shift the resonant angle toward the critical angle and have smaller half maximum band widths (HMBW) at (64°, 2°) and (61.52°, 0.25°) for symmetric and asymmetric designs, respectively.

Original languageEnglish
Pages (from-to)219-229
Number of pages11
JournalSensors and Actuators, B: Chemical
Volume117
Issue number1
DOIs
StatePublished - 12 Sep 2006

Keywords

  • Admittance loci
  • Biosensor
  • Dielectric mirror
  • Surface plasmon resonance

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