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Optical detection continues to dominate detection methods in microfluidics due to its noninvasive nature, easy coupling, rapid response, and high sensitivity. In this review, we summarize two aspects of recent developments in optical detection methods on microfluidic chips. The first aspect is free-space (off-chip) detection on the microchip, in which the conventional absorption, fluorescence, chemiluminescence,...
A chip scale optofluidic tunable laser is realized by generating a periodic bubble array within a microfluidic channel. By controlling the periodicity via external pressure the lasing frequency is tuned over a broad range.
In this work we report the performance optimization of an integrated optofluidic ring resonator (ORR) based on liquid core hybrid antiresonant reflecting optical waveguides (h-ARROWs). We show that with an accurate design of each optical elements of the proposed ring, quality factor up to 1.4×104 can be achieved.
The antiresonant reflecting optical waveguide (ARROW) with hollow core and liquid core are one of the most promising technologies in Lab-on-a-Chips and optofluidic research. Motivated by this, in this paper we present the design, simulation and fabrication processes of hollow core ARROW built in Corning glass substrates and utilizing Si3N4/SiO2 PECVD antiresonant reflecting multilayer films on the...
A microfabricated optofluidic ring resonator (μOFRR) sensor for volatile organic compounds (VOC) is described. SiOx optical resonators integrated into a microfluidic pathway were defined lithographically and fabricated via Si micromachining. Whispering gallery mode resonances with quality factors exceeding 104 were excited in devices with diameters of 50–250 μm and wall thicknesses of 1.5–2 μm. Fluidic...
We adapt silicon-on-insulator 100µm-core multimode interferometer waveguides for two-dimensional microparticle trapping and manipulation. The waveguide mode fields in 1550nm wavelengths enable thermal flow assisted optical manipulation of 2.2µm polystyrene microparticles in a thin fluidic cell.
In this paper, we present a new method for designing an optofluidic interferometric sensor to measure the pressure and flow rate based on generated optical ring pattern. This sensor consists of a flexible air gap optical cavity whose curvature depends on the pressure. When illuminated by a monochromatic light, the curved surface generates the interference patterns. In our numerical simulations, we...
We report the implementation of a fully on-chip, lensless, sub-pixel resolving optofluidic microscope (SROFM) based on the super resolution algorithm. The device utilizes microfluidic flow to deliver specimens directly across a complementary metal oxide semiconductor (CMOS) sensor to generate a sequence of low-resolution (LR) projection images, where resolution is limited by the sensor's pixel size...
We demonstrate an optofluidic microscopy scheme which can acquire stereo images, utilizing different angles of illumination for projection imaging with our sub-pixel resolving optofluidic microscope.
We report on the achievement of a continuously tunable photonic molecule from an homoatomic to an heteroatomic condition. A complete control of the local mode tuning of two nominally identical photonic crystal microcavities on slab is obtained by a combination of different techniques. Homoatomic molecules are obtained by compensating the photonic disorder up to the standard condition of zero detuning...
We introduce a novel tuning mechanism for optofluidic devices by embedding pressure driven actuator inside microfluidic chips. Multiple tunable optofluidic devices remotely controlled by the pressure of air or liquid were demonstrated.
By way of hydrophobic coating on the exterior and interior surface of silicon photonic crystal, color of silicon photonic crystal can be changed with a sub-second response time via liquid infiltration and exfiltration.
In this contribution we present the design, fabrication and measurement results of an evanescent liquid-core/ liquid-cladding (L2) waveguide sensor system for on-chip fluorescence spectroscopy. To efficiently excite the sample (fluorescent particles or solutions) in the laminar flow regime a novel hydrodynamic focusing design is realized which positions the analyte in the evanescent field region at...
We demonstrated an optofluidic distributed feedback (DFB) dye laser on a poly(dimethylsiloxane) (PDMS) chip. Single-mode operation was obtained with 0.21 nm linewidth. We achieved nearly 60 nm continuously tunable output by mechanically varying the grating period.
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