The present invention generally relates to systems and methods for mixing and dispensing a sample droplet from a microfluidic system, such as a liquid bridge system. A middle portion of the drive shaft is disposed axially between the upper and lower ends and has a smaller diameter than each of the upper and lower ends. In the first mode, the emission and detection system preferably operates as a subwavelength focusing, wideband, superlens using a near field super gain synthetic aperture continuous wave swept radar. The original full-resolution image is divided into a foveal area and a peripheral area.