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A germanium strip waveguide on a silicon substrate is integrated with a microfluidic chip to detect cocaine in tetrachloroethylene solutions. In the evanescent field of the waveguide, cocaine absorbs the light at 5.8μm, which is emitted from a quantum cascade laser. The lowest measured concentration is 100μg/ml.
Margaux Catherine Marie Duchamp
Lyesse Laloui, Dimitrios Terzis, Filippo Miele, Ariadni Elmaloglou