Nanoparticle Layer Deposition for Plasmonic Tuning of Microstructured Optical Fibers

Institute of Photonic Technology (IPHT), PO Box 100 239, 07702 Jena, Germany.
Small (Impact Factor: 8.37). 11/2010; 6(22):2584-9. DOI: 10.1002/smll.201001071
Source: PubMed


Plasmonic nanoparticles with spectral properties in the UV-to-near-IR range have a large potential for the development of innovative optical devices. Similarly, microstructured optical fibers (MOFs) represent a promising platform technology for fully integrated, next-generation plasmonic devices; therefore, the combination of MOFs and plasmonic nanoparticles would open the way for novel applications, especially in sensing applications. In this Full Paper, a cost-effective, innovative nanoparticle layer deposition (NLD) technique is demonstrated for the preparation of well-defined plasmonic layers of selected particles inside the channels of MOFs. This dynamic chemical deposition method utilizes a combination of microfluidics and self-assembled monolayer (SAM) techniques, leading to a longitudinal homogeneous particle density as long as several meters. By using particles with predefined plasmonic properties, such as the resonance wavelength, fibers with particle-adequate spectral characteristics can be prepared. The application of such fibers for refractive-index sensing yields a sensitivity of about 78 nm per refractive index unit (RIU). These novel, plasmonically tuned optical fibers with freely selected, application-tailored optical properties present extensive possibilities for applications in localized surface plasmon resonance (LSPR) sensing.

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    • "In Fig. 5, typical extinction spectra for different Ag triangles and Au spheres are diagrammed. These spectra agree very well with those taken with the same NP in solution [18]. In some cases, a subsidiary peak appeared when the NP were bound onto a surface. "
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