title: Polarization-based refractive index sensor using dual asymmetric long-period gratings in ridge waveguides.
abstract: We propose a sensor scheme operating in the wavelength band of 1460-1530 nm (S band) that utilizes two orthogonally polarized eigenmodes in a ridge-waveguide geometry by employing a pair of nonidentical asymmetric long-period gratings. Numerical simulations show a high sensitivity ~4900 nm/RIU (refractive index unit) over the refractive index range 1.33-1.34 exhibiting a relative resonance shift of 1 pm for an index change of ~10(-7). Such high resolution sensors enable detection of minute changes with potential applications to various biochemical industries.
authors.affiliation: Department of Physics, Indian Institute of Technology Delhi, New Delhi, India. ruchigarg19@gmail.com
authors.forename: Ruchi
authors.initials: R
authors.lastname: Garg
authors.forename: K
authors.initials: K
authors.lastname: Thyagarajan