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This paper presents a polydimethyl-siloxane (PDMS) microlens bonding on a compact disk (CD) microfluidic device that performs an enzyme-linked immunosorbent assay (ELISA) to enhance the sensitivity of bio-detection. The PDMS microlens can be fabricated with ease using soft replica molding method. A commercial software tool (ZEMAX) has been established to analyze the focal length of the microlens....
This paper presents the surface sensing characteristics of bent slot waveguides through a combined effective-index method/modified transfer-matrix method. The effect of waveguide parameters, including waveguide width, slot width, bending radius, and asymmetry coefficient on the waveguide surface sensitivity is investigated. We reveal that bent single-slot waveguides provide higher surface sensitivity...
This paper reports a technique for manipulation of carbon nanotubes (CNTs). A photoconductive layer capable of generating a non-uniform electric field at illuminated sites was used to optically induce dielectrophoretic forces for manipulating CNTs. The light patterns enabled a variety of flexible modes for CNT manipulation since it was possible to dynamically reconfigure the optical patterns. This...
This paper presents the electrical performance on low-dimensional quantum structure photoelectric sensor. The equivalent circuit model for photoelectric sensor with quantum-dot quantum-well hybrid structure was applied. The parasitical parameters can be used to investigate the performance of photoelectric detector. Based on this model, specific readout circuit was designed and simulated. A prototype...
Bending efficiency of three-dimensional bent multiple-slot waveguides are studied applying a combined method of effective-index and modified transfer-matrix methods. The effects of asymmetric structure (in which the widths of inner and outer strips are unequal), asymmetric slots (slots with different widths), and asymmetric middle strips (middle strips with dissimilar widths) on the bending efficiency...
Device consisting of a micro-pattern grating structure with membrane of alternating dielectric materials such as SiO2, Si3N4 and SOG or ITO, is fabricated. Its utilization as a platform for attaching active silane layer such as APTES, further as a sensor after immobilizing of sensing molecules and hybridizing with complimentary molecules is demonstrated. Shifting in peak wavelength is observed when...
We present real-time measurements of sessile contact angle variations by EWOD (electrowetting-on-dielectric) using QCM (quartz crystal microbalance). Different from the conventional contact angle goniometry, the QCM measurement abandons optical components involving in the system and hence has potential to prevent possible optical difficulties, such as blurred images caused by insufficient depth of...
The paper presents a new immunomagnetic-bead-based microfluidic system integrated with an optical detection module for rapid diagnosis of influenza infection. By using the immunomagnetic beads conjugated with influenza-specific antibodies, the developed system can detect influenza viral particles with a high sensitivity and specificity while compared with large-scale systems. The viral particles were...
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