Modification of the refractive index response of long period gratings using thin film overlays

Modification of the refractive index response of long period gratings using thin film overlays Imran M. Ishaq, Antonio Quintela, Stephen W. James, Geoffrey J. Ashwell, José M. López- Higuera, Ralph Tatam Sensors and Actuators B Chemical, Vol.107, Nº 2, pp 738-741, 29/06/2005 ISSN: 0925-4005