Publication

Mid-infrared Waveguide Evanescent Field Chemical Sensor for Liquids

Alexandra Anne Labiba Kämpfer-Homsy
2011
Conference Papers

Abstract

Based on a mid-infrared waveguide fabricated from Germanium on Silicon substrates, we present a concept of chemical sensors in aqueous solutions. The sensing scheme is utilizing the evanescent wave in a single-mode waveguide, and the absorption spectrum of chemicals dissolved in liquids. The waveguide is coupled to a singlemode mid-infrared quantum cascade laser [1], and an infrared detector. The wavelength of 5.81 microns is chosen to assure the specifity and sensitivity of the pilot application [2] for the analysis of cocaine analyte, in a water based matrix (saliva). A micro-fluidic system will be used for sample preparations.

Official source

https://infoscience.epfl.ch/entities/publication/38d583ef-6fb6-4b3b-979f-620407e9f4cf

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Alexandra Anne Labiba Kämpfer-Homsy
2011
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/38d583ef-6fb6-4b3b-979f-620407e9f4cf

About this result

Related concepts (32)

Waveguide

A waveguide is a structure that guides waves, such as sound (acoustic waveguide), light (optical waveguide), radio waves (radio-frequency waveguide) or other electromagnetic waves, with minimal loss of energy by restricting the transmission of energy to one direction. Without the physical constraint of a waveguide, wave intensities decrease according to the inverse square law as they expand into three-dimensional space. There are different types of waveguides for different types of waves.

Waveguide (optics)

An optical waveguide is a physical structure that guides electromagnetic waves in the optical spectrum. Common types of optical waveguides include optical fiber waveguides, transparent dielectric waveguides made of plastic and glass, liquid light guides, and liquid waveguides. Optical waveguides are used as components in integrated optical circuits or as the transmission medium in local and long-haul optical communication systems.

Waveguide (radio frequency)

In radio-frequency engineering and communications engineering, waveguide is a hollow metal pipe used to carry radio waves. This type of waveguide is used as a transmission line mostly at microwave frequencies, for such purposes as connecting microwave transmitters and receivers to their antennas, in equipment such as microwave ovens, radar sets, satellite communications, and microwave radio links. The electromagnetic waves in a (metal-pipe) waveguide may be imagined as travelling down the guide in a zig-zag path, being repeatedly reflected between opposite walls of the guide.

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Mid-infrared Waveguide Evanescent Field Chemical Sensor for Liquids

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