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).
© 2009 Optical Society of America
Original Manuscript: June 16, 2009
Revised Manuscript: September 12, 2009
Manuscript Accepted: September 13, 2009
Published: October 7, 2009
Amita Kapoor and Enakshi K. Sharma, "Long period grating refractive-index sensor: optimal design for single wavelength interrogation," Appl. Opt. 48, G88-G94 (2009)