On Chip Waveguides

On-Chip Waveguides, Fig. 3 Structures of (a) planar and (b) channel waveguides... 

Alternatively, microfluidic systems can be designed to take advantage of the evanescent field by immobilizing analyte-sensitive fluorescent dye on the surface of the on-chip waveguide. In this configuration, the evanescent energy field... 

On-Chip Waveguides, Fig. 4 Schematic illustrating typical placement of on-chip optical waveguides in a microfluidic system... 

On-chip waveguides can be fabricated from different types of core materials. Traditionally glass has been a popular choice, but recently polymers have gained popularity due to lower costs and excellent transmittance characteristics [4]. Furthermore, polymeric waveguides can now be easily integrated with microfluidic devices, which are now commonly made in polymers. 

A common and simple approach to creating cladding around a polymer core is to sandwich it between two substrates. These substrates form cladding on top and bottom surfaces of the waveguide. Side cladding layers are formed by microchannels filled with air. This approach, schematically illustrated in Fig. 6, can be used to fabricate on-chip waveguides in a variety of polymers. 

On-Chip Waveguides, Fig. 7 Fabrication of polymer core waveguides using two polymer materials... 

On-Chip Waveguides, Fig. 10 (a) PDMS capillary electrophoresis chip with on-chip waveguides, (b) Top view of the optical detection site, illustrating the... 

Fabrication of waveguides on-chip is important in microfluidic devices, since optical detection is used for many applications. While microfluidics has made it possible to integrate many fluidic casts on a single chip, most optical components such as light sources and sensors remain off-chip. On-chip waveguides provide an interface between these off-chip optical components and on-chip microfluidics. With the drive towards portable microfluidic systems for point-of-care diagnostics or on-site analysis, it is highly... 

Contopanagos H, Zacharatos F, Nassiopoulou AG (2008a) RF characterization and isolation properties of mesoporous Si by on-chip waveguide measurements. Solid State Electron 52 1730-1734... 

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