Journal
NANO LETTERS
Volume 16, Issue 8, Pages 5143-5151Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b02076
Keywords
All-dielectric nanophotonics; silicon resonators; optical antenna; fluorescence enhancement; Mie scattering
Categories
Funding
- French Government program Investissements d'Avenir [ANR-11-IDEX-0001-02]
- European Commission [FP7-ICT-2011-7, 288263]
- ERC [StG 278242]
- Erasmus Mundus Doctorate Program Europhotonics [159224-1-2009-1-FR-ERA MUNDUS-EMJD]
- Spanish Ministry of Economy and Competitiveness [SEV-2015-0522, FIS2014-56107-R]
- Fundacion Privada Cellex
- ICREA Funding Source: Custom
Ask authors/readers for more resources
Plasmonic antennas have a profound impact on nanophotonics as they provide efficient means to manipulate light and enhance light matter interactions at the nanoscale. However, the large absorption losses found in metals can severely limit the plasmonic applications in the visible spectral range. Here, we demonstrate the effectiveness of an alternative approach using all-dielectric nanoantennas based on silicon dimers to enhance the fluorescence detection of single molecules. The silicon antenna design is optimized to confine the near-field intensity in the 20 nm nanogap and reach a 270-fold fluorescence enhancement in a nanoscale volume of lambda(3)/1800 with dielectric materials only. Our conclusions are assessed by combining polarization resolved optical spectroscopy of individual antennas, scanning electron microscopy, numerical simulations, fluorescence lifetime measurements, fluorescence burst analysis, and fluorescence correlation spectroscopy. This work demonstrates that all-silicon nanoantennas are a valid alternative to plasmonic devices for enhanced single molecule fluorescence sensing, with the additional key advantages of reduced nonradiative quenching, negligible heat generation, cost-efficiency, and complementary metal oxide semiconductor (CMOS) compatibility.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available