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Updated: Jun 2, 2026
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Fabrication of Periodic Gold Nanocup Arrays Using Colloidal Lithography
Published on: September 2, 2017
High sensitivity plasmonic index sensor using slablike gold nanoring arrays.
Chia-Yang Tsai1, Shao-Ping Lu, Jyun-Wei Lin
1Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Rm. 415, CPT Building, 1001 Ta-Hsueh Road, Hsinchu 300, Taiwan.
Applied Physics Letters
|May 12, 2011
Summary
We studied gold nanorings and found their sensitivity to refractive index changes can be tuned by adjusting ring width. A high sensitivity of 691 nm/RIU was achieved for 199 nm nanorings.
Area of Science:
- Plasmonics
- Nanophotonics
- Optical materials
Background:
- Plasmonic nanostructures offer unique optical properties.
- Sensing applications require high sensitivity to refractive index changes.
Purpose of the Study:
- To investigate the index sensing characteristics of gold nanoring arrays.
- To explore the effect of ring width on plasmonic modes and sensitivity.
Main Methods:
- Fabrication of square lattice slablike gold nanorings (NRs) with varying widths.
- Optical extinction spectroscopy to analyze plasmonic modes.
- Experimental determination of refractive index sensitivity.
Main Results:
- Gold NR arrays showed two extinction peaks (antibonding and bonding modes).
- Observed redshift and blueshift in modes with increasing ring width.
- Demonstrated tunable sensitivity of the bonding mode by varying ring width.
Conclusions:
- The refractive index sensitivity of gold nanorings is controllable via ring width.
- Achieved a high sensitivity of 691 nm/RIU for nanorings with 199 nm average width.
