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Plasmonics

, Volume 12, Issue 3, pp 655–661 | Cite as

Extraordinary Transmission Characteristics of Subwavelength Nanoholes with Rectangular Lattice

  • Arif E. Cetin
  • Martin Dršata
  • Yasa Ekşioğlu
  • Jiří PetráčekEmail author
Article

Abstract

We investigate the extraordinary optical transmission (EOT) properties of nanohole arrays with a rectangular lattice for label-free refractive index sensing applications. We show that the deviation within the periodicities along the two axes at the nanohole plane leads to more advantageous spectral quality of EOT signal compared to the conventional square lattice geometries. We introduce a way to further improve the sensitivity of the aperture system by carefully choosing the periodicities. We introduce nanohole arrays with a rectangular lattice supporting EOT signals with larger figure-of-merit values as well as enabling much stronger light transmission. We also model a nanohole system covered with a thin dielectric layer, mimicking biomolecules captured on the gold surface, in order to show its biosensing capability. We also show that certain deviation amounts between periodicities create spectral splitting within the EOT signal leading to larger spectral shifts in the presence of a thin dielectric film.

Keywords

Plasmonics Nanoholes Extraordinary optical transmission Rectangular lattice Label-free biosensing 

Notes

Acknowledgments

J. Petráček acknowledges the support of the Ministry of Education, Youth, and Sports of the Czech Republic (project LD14008).

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Koch Institute for Integrative Cancer ResearchMassachusetts Institute of TechnologyCambridgeUSA
  2. 2.Faculty of Mechanical Engineering, Institute of Physical EngineeringBrno University of TechnologyBrnoCzech Republic
  3. 3.Department of Electrical and Electronics EngineeringIstanbul Kemerburgaz UniversityIstanbulTurkey
  4. 4.CEITEC - Central European Institute of TechnologyBrno University of TechnologyBrnoCzech Republic

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