High-Sensitivity Selective Optical Chemosensor Based On Photonic Crystal Lattice Deformation Anisotropy
The use of photonic crystals as sensors is based on the change of their spectral characteristics on exposure to various analytes. A new approach based on a recently discovered asymmetry in deformation of the photonic crystals lattice allowed to create cheap, high-sensitive and fast chemosensors which do not require spectral instruments. This effect shows itself most strongly in gaseous ammonia. The sensitivity of such a sensor is several parts per million (ppm), while the response to an increase in concentration is less than 200 ms.