On-chip optical trapping and Raman spectroscopy using a TripleX dual-waveguide trap
| Autor: | Rene Heideman, Jeroen Heldens, Marcel Hoekman, Thijs van Leest, Arne Leinse, Jacob Caro, Martijn Boerkamp |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Scanning electron microscope Physics::Optics Trapping law.invention symbols.namesake raman spectroscopy Planar Optics law Physics::Atomic Physics Coherent anti-Stokes Raman spectroscopy laser trapping Condensed Matter::Quantum Gases business.industry waveguides Atomic and Molecular Physics and Optics integrated optics devices OA-Fund TU Delft Optical tweezers planar symbols Raman spectroscopy business Waveguide Raman scattering |
| Zdroj: | Optics Express, 22 (25), 2014 |
| ISSN: | 1094-4087 |
| Popis: | We present a new approach to the dual-beam geometry for on-chip optical trapping and Raman spectroscopy, using waveguides microfabricated in TripleX technology. Such waveguides are box shaped and consist of SiO2 and Si3N4, so as to provide a low index contrast with respect to the SiO2 claddings and low loss, while retaining the advantages of Si3N4. The waveguides enable both the trapping and Raman functionality with the same dual beams. Polystyrene beads of 1 µm diameter can be easily trapped with the device. In the axial direction discrete trapping positions occur, owing to the intensity pattern of the interfering beams. Trapping events are interpreted on the basis of simulated optical fields and calculated optical forces. The average transverse trap stiffness is 0.8 pN/nm/W, indicating that a strong trap is formed by the beams emitted by the waveguides. Finally, we measure Raman spectra of trapped beads for short integration times (down to 0.25 s), which is very promising for Raman spectroscopy of microbiological cells. |
| Databáze: | OpenAIRE |
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