Journal
NANO LETTERS
Volume 10, Issue 11, Pages 4450-4455Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl102270p
Keywords
Optical enhancement; surface modes; biosensing; waveguides; particle arrays; optical switching
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Funding
- Spanish MICINN [MAT2007-66050]
- European Commission [FP7-248909, NMP4-SL-2008-213669]
- Fundacio Cellex Barcelona
- ICREA Funding Source: Custom
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We present resonant dielectric structures exhibiting arbitrarily large optical field enhancement, only limited by fabrication imperfections. Three different arrangements are investigated, based upon dielectric waveguides, dielectric particle arrays, and a combination of these two structures. Experimental confirmation of enhancement in a waveguide resonator is achieved by measuring the luminescence of quantum dots dispersed in the hot optical region of the structure. The performance of these systems can be readily controlled by simply changing geometrical parameters, which allows obtaining remarkable values of the intensity enhancement approaching 10(5) relative to the incident intensity over large volumes under feasible experimental conditions. This opens new avenues for all-optical switching and biosensing.
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