Journal article
Photonic crystal fiber long-period gratings for biochemical sensing
Fibers & Nonlinear Optics, Department of Photonics Engineering, Technical University of Denmark1
Department of Photonics Engineering, Technical University of Denmark2
Micro Array Technology, Department of Micro- and Nanotechnology, Technical University of Denmark3
Department of Micro- and Nanotechnology, Technical University of Denmark4
We present experimental results showing that long-period gratings in photonic crystal fibers can be used as sensitive biochemical sensors. A layer of biomolecules was immobilized on the sides of the holes of the photonic crystal fiber and by observing the shift in the resonant wavelength of a long-period grating it was possible to measure the thickness of the layer.
The long-period gratings were inscribed in a large-mode area silica photonic crystal fiber with a CO2 laser. The thicknesses of a monolayer of poly-L-lysine and double-stranded DNA was measured using the device. We find that the grating has a sensitivity of approximately 1.4nm/1nm in terms of the shift in resonance wavelength in nm per nm thickness of biomolecule layer.
Language: | English |
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Year: | 2006 |
Pages: | 8224-8231 |
ISSN: | 10944087 |
Types: | Journal article |
DOI: | 10.1364/OE.14.008224 |
ORCIDs: | Dufva, Hans Martin and Bang, Ole |