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A germanium (Ge) strip waveguide on a silicon (Si) substrate is integrated with a microfluidic chip to detect cocaine in tetrachloroethylene (PCE) solutions. In the evanescent field of the waveguide, cocaine absorbs the light near 5.8 mm, which is emitted from a quantum cascade laser. This device is ideal for (bio-)chemical sensing applications.
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Yu-Chi Chang, Nico de Rooij, Joab Di Francesco, Hans Peter Herzig, Lubos Hvozdara, Vincent Paeder, Peter Van der Wal, Philip Wägli
Yu-Chi Chang, Nico de Rooij, Hans Peter Herzig, Lubos Hvozdara, Philip Wägli