External electro-optic sampling utilizing an asymmetric Fabry-Perot film of poled electro-optical polymer

External electro-optic sampling has been first demonstrated using a poled e lectro-optical polymer asymmetric Fabry-Perot film, placed freely on the in dium-tin oxide coplanar waveguide transmission line and used as an electro- optic probe tip. Only one laser beam is required due to the fact that the a symmetric Fabry-Perot him is utilized to convert the phase modulation to am plitude modulation. A 1.2 GHz microwave signal is sampled, and the voltage sensitivity of about 2mV/root Hz is obtained. The results are promising for technical applications in high-speed electronic devices and monolithic mic rowave integrated circuits research.