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Published on: July 21, 2018
Bimetallic structure fabricated by laser interference lithography for tuning surface plasmon resonance
C H Liu1, M H Hong, H W Cheung
1Department of Electrical and Computer Engineering, 4 Engineering Drive 3, Singapore 117576.
Optics Express
|July 9, 2008
Summary
This study explores tuning surface plasmon resonance in gold and silver nanostructures. Bimetallic films and dot arrays show blue-shifted spectral peaks due to gold-silver interactions.
Area of Science:
- Materials Science
- Nanotechnology
- Optics
Background:
- Surface plasmon resonance (SPR) is a phenomenon sensitive to the optical properties of nanostructures.
- Bimetallic nanostructures offer tunable optical properties compared to single-metal counterparts.
- Controlling SPR is crucial for applications in sensing, imaging, and optoelectronics.
Purpose of the Study:
- To investigate the tuning of surface plasmon resonance (SPR) in gold and silver bimetallic thin films and nanodot arrays.
- To fabricate and characterize bimetallic nanostructures for optical applications.
- To understand the electromagnetic interactions governing SPR in these bimetallic systems.
Main Methods:
- Fabrication of nanostructures using laser interference lithography.
- Deposition of gold and silver thin films via electron beam evaporation.
- Characterization of surface plasmon behavior using UV-Vis spectroscopy.
- Analysis of bimetallic dot arrays obtained through a lift-off procedure.
Main Results:
- A blue shift in the optical spectral peak was observed for gold thin films coated with silver.
- Bimetallic nanodot arrays exhibited a similar blue shift compared to single gold nanodot arrays.
- The observed spectral shifts are attributed to the interaction between gold and silver atoms.
- Electromagnetic interactions were analyzed using a simplified spring model.
Conclusions:
- Gold and silver bimetallic nanostructures allow for tuning of surface plasmon resonance.
- The interaction between gold and silver is key to achieving the observed spectral shifts.
- The findings provide insights into the design of nanostructures for optical applications.
