title: Long period grating refractive-index sensor: optimal design for single wavelength interrogation.
abstract: We report the design criteria for the use of long period gratings (LPGs) as refractive-index sensors with output power at a single interrogating wavelength as the measurement parameter. The design gives maximum sensitivity in a given refractive-index range when the interrogating wavelength is fixed. Use of the design criteria is illustrated by the design of refractive-index sensors for specific application to refractive-index variation of a sugar solution with a concentration and detection of mole fraction of xylene in heptane (paraffin).
authors.affiliation: Shaheed Rajguru College of Applied Sciences for Women, University of Delhi, Delhi 110095, India.
authors.forename: Amita
authors.initials: A
authors.lastname: Kapoor
authors.forename: Enakshi K
authors.initials: EK
authors.lastname: Sharma