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A surface plasmon resonance spectrometer using a super-period metal nanohole array.
1Department of Electrical and Computer Engineering, University of Alabama in Huntsville, Huntsville, AL 35899, USA.
Optics Express
|October 6, 2012
Summary
Super-period nanohole arrays enable surface plasmon resonance (SPR) spectroscopy. This novel SPR spectrometer utilizes first-order diffraction for enhanced measurement capabilities.
Area of Science:
- Nanophotonics
- Plasmonics
- Spectroscopy
Background:
- Super-period nanohole arrays combine subwavelength and grating periods.
- These arrays support local surface plasmon resonance (LSPR) and diffraction phenomena.
Purpose of the Study:
- To investigate surface plasmon resonance (SPR) in super-period nanohole arrays.
- To demonstrate a novel SPR spectrometer utilizing these arrays.
Main Methods:
- Fabrication of super-period metal nanohole array gratings.
- Characterization of SPR using zeroth-order transmission and first-order diffraction.
Main Results:
- SPR can be measured in both zeroth-order transmission and first-order diffraction.
- First-order diffraction SPR peaks exhibit a slight blue-shift compared to zeroth-order peaks.
Conclusions:
- Super-period nanohole arrays offer versatile SPR measurement modes.
- The ability to measure SPR in diffracted orders expands spectroscopic applications.
