, Volume 8, Issue 2, pp 385–390

Free-Space Plasmonic Filter with Dual-Resonance Wavelength Using Asymmetric T-Shaped Metallic Array


DOI: 10.1007/s11468-012-9402-0

Cite this article as:
Wang, CM. & Yu, CJ. Plasmonics (2013) 8: 385. doi:10.1007/s11468-012-9402-0


In this study, we propose a plasmonic free-space filter with dual resonance wavelength by using an asymmetric T-shaped array. The structure under the T-shaped structure forms two metal/insulator/metal cavities with different cavity length. Each cavity supports a specific resonance wavelength. A notch filter for second harmonic generation Nd:YAG laser is also proposed. The filter offers two resonance dips and low sideband. In addition, the filter properties are based on the localized surface plasmon. Therefore, the angle tolerance is extremely high. This makes the proposed structure easy to align. The proposed structure can be used in dual wavelength biosensing detection and dual wavelength thermal emission applications.


Surface plasmons Subwavelength structures Optical filter 

Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.Department of Opto-electronic EngineeringNational Dong Hwa UniversityHualienTaiwan

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