We report for the first time an electrically pumped vertical cavity surface emitting laser (VCSEL) with a microfluidic channel as an integral part of the laser cavity to form a photonic biosensor. This paper demonstrates the dependence of threshold current and slope efficiency of the laser diode on the refractive index of the fluid in the channel.
A microfluidic passive cavity interferometer based biosensor was developed in this work. Polystyrene microspheres were used to test the device performance. Measured transmission spectra of single microspheres were compared to the modeled results.
A fluidic cavity vertical-cavity surface-emitting laser (VCSEL) is presented for the detection of biological agents via introducing the analytic biofluid into the high finesse laser cavity. The optical properties of the fluid as modified by the biological cells they contain are sensed by monitoring the output optical intensity and wavelength of the laser. As a preliminary study, our first generation electrically pumped GaAs/AlGaAs based fluidic cavity VCSEL is described, with emphasis on the system design and techniques for the system construction. The device shows a strong spontaneous emission and a considerable wavelength shift when DI water is capillarily fed into the fluidic cavity.
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