Optimized guided mode resonant structure as thermooptic sensor and liquid crystal tunable filter

Applicability of guided mode resonant structures to tunable optical filtering and sensing is demonstrated using nematic liquid crystals.As a sensor,a minimum refractive index detectivity of 10-5 is demonstrated while as a tunable filter,tunability range of few tens of nanometers with 2-nm bandwidth is presented.The optimum design is achieved by maximizing the evanescent field region in the analyte which maximizes the overlap integral.The device can be operated in reflection or transmission modes at normal i...