Figure 1
From: Ultra-fast cell counters based on microtubular waveguides
(a,b) Scanning electron microscope (SEM) images of (a) a rolled-up coplanar waveguide inside a GaAs/InGaAs microtube and (b) an SU8 channel structure for microfluidic connections to the microtube. Scalebars: 100 μm. (c) Photograph of the soldered microtube chip with microfluidic and SMA connections for connecting to the VNA. (d) Schematic of the VNA measurement circuit. (e) Photograph of the soldered microtube chip with microfluidic and SMA connections for connecting to the lock-in amplifier. (f) Schematic of the lock-in measurement circuit.
