| Autor: |
Yan Jun Liu, Bala Krishna Juluri, Timothy J. Bunning, Yanhui Zhao, Mengqian Lu, Tony Jun Huang |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
Journal of applied physics. 112(11) |
| ISSN: |
0021-8979 |
| Popis: |
We have developed a simple, high-throughput, and cost-effective method to fabricate one-dimensional and two-dimensional periodically corrugated silver films over centimeter scale areas. This fabrication uses a single-step holographic patterning technique with laser intensities as low as 88.8 mW/cm(2) to deposit silver nanoparticles directly from solution to create gratings with periodicities of 570 nm. A dip in the transmission spectrum for these samples is observed due to certain visible wavelengths coupling to surface plasmon polaritons (SPPs) and the peak wavelength of this dip has a linear relationship with the surrounding material's refractive index (RI) with a sensitivity of 553.4 nm/RIU. The figure of merit (the ratio of refractive index sensitivity to the full width at half maximum (FWHM)) is typically in the range of 12-23. Our technique enables single-step fabrication of uniform, sub-wavelength periodic metal structures over a large area with low cost. Such sub-wavelength periodic metal structures are promising candidates as disposable sensors in applications such as affordable environmental monitoring systems and point-of-care diagnostics. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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