The sensor is able to tell them apart with distinctive patterns. We have chosen four conventional materials for test: polymer, silicon, aluminum and silver. When objects with different refractive indexes are placed on the surface of the sensor, the evanescent field is disturbed and both the local modal distribution and the coupling condition with the connecting segments are altered, leading to different interference patterns when light from the output facet is captured and focused onto a camera. The array is formed by imbedding layered silicon nitride stripes as waveguide cores in polymer cladding and the top cladding layer is etched open for material sensing. Note: Author names will be searched in the keywords field, also, but that may find papers where the person is mentioned, rather than papers they authored.Īn evanescent field sensor to identify materials by contact has been demonstrated using a 3D coupled waveguide array.Use a comma to separate multiple people: J Smith, RL Jones, Macarthur.
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