Yu-Chi Chang

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Related publications (4)

Droplet-based Liquid-Liquid Extraction and On-Chip IR-Waveguide-Spectroscopy Detection of Cocaine in Human Saliva

Nico de Rooij, Hans Peter Herzig, Yu-Chi Chang, Peter Van der Wal, Philip Wägli, Lubos Hvozdara

We present a portable microsystem to quantitatively detect cocaine in human saliva. The chip combines a simple microfluidic method for multiphase liquid-liquid extraction to transfer cocaine from IR-light absorbing saliva to an IRtransparent solvent with t ...

2012

Design, Fabrication and Characterization of Mid-Infrared Strip Waveguide for Laser Spectroscopy in Liquid Environments

Yu-Chi Chang

Optical sensors based on the interaction between molecular vibrations and mid infrared radiations attracted high attentions in the last decades. In this study, we present the development of a waveguide evanescent field sensor based on the absorption spectr ...

EPFL2012

Demonstration of superprism effect in silicon pillar 2-D photonic crystal infiltrated with liquid crystals

Pierre-Yves Baroni, Hans Peter Herzig, Yu-Chi Chang, Vincent Paeder

Superprism-based deflection of an optical beam is observed in a photonic crystal composed of a triangular lattice of pillars infiltrated with a liquid crystal. The device is based on a Silicon-on-insulator substrate and operates in the telecommunications b ...

2011

Single Mode Mid-infrared Waveguide for Evanescent Sensor Scheme in Liquids

Hans Peter Herzig, Yu-Chi Chang, Vincent Paeder, Philip Wägli, Lubos Hvozdara

A Si/Ge based, single mode, mid-infrared optical waveguide, is used as an evanescent sensor in liquid matrix. The selectivity is achieved by the use of quantum cascade lasers (QCLs) tuned to the maximum absorption of a given analyte. The cocaine detection ...

2011

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