Citation:
Imran M. Ishaq, Antonio Quintela, Stephen W. James, Geoffrey J. Ashwell, José M. Lopez-Higuera and Ralph P. Tatam, Modification of the refractive index response of long period gratings using thin film overlays, Sensors and Actuators B: Chemical, Volume 107, Issue 2, 29 June 2005, Pages 738-741.
Abstract:
The response of a fibre optic long period grating (LPG) to the surrounding
refractive index is shown to be modified by the deposition of a thin film of
thickness of order 100 nm onto the cladding. The LPG becomes sensitive to
surrounding refractive indices greater than that of silica, and exhibits an
enhanced sensitivity to external refractive indices lower than that of silica.
