  We present an ultrafast single sub-micron particle detection method based on
a half-bowtie coplanar waveguide. The method is capable of resolving the
translocation of these particles at a bandwidth greater than 30MHz. We compare
experimentally the simultaneous use of our radio- frequency technique with
conventional DC based resistive pulse recordings and find that our method has a
throughput that is enhanced by two orders of magnitude. The technique
incorporates a microfluidic circuit and has potential to be employed for
screening nano particles and biopolymers such as DNA at frequencies in excess
of 1 GHz.

Applied Physics