ABSTRACT

Semiconductor Microring....................................................... 275 8.3 Polarization Switching Dynamics of Thin-Film

Ferroelectric Capacitors...................................................................... 275 8.3.1 Background............................................................................. 275 8.3.2 Pulse Method and Simulation ................................................ 276 8.3.3 Experiment and Results.......................................................... 281

8.3.3.1 Experiment ............................................................... 281 8.3.3.2 Experimental Results ............................................... 284

8.3.4 Summary on the Polarization Switching Dynamics of Ferroelectric Thin-Film Capacitors ................................... 287

8.4 Polymer High-Speed Photoconductive Effect in Thin Films ............ 289 8.4.1 Background............................................................................. 289 8.4.2 Experiment.............................................................................. 290

8.4.2.1 Sampling Oscilloscope Measurement...................... 290 8.4.2.2 Photoconductive Sampling Using

BAMH-PPV Switches .............................................. 297 8.4.2.3 Result of Photoconductive Sampling

Measurements........................................................... 298 8.4.3 Experimental Results and Discussions................................... 299 8.4.4 Summary on Polymer High-Speed Photoconductive

Effect in Thin Films ............................................................... 301 8.5 Conclusion .......................................................................................... 302 Acknowledgment ......................................................................................... 302 References.................................................................................................... 302

The plasma or free carrier state in a semiconductor has received considerable

attention in the past, owing to its applications in microwave control compon-

ents. Essentially, both the dielectric and conductive properties of the plasma

in a semiconductor can be used to control the transmission and propagation of

an electromagnetic wave. Optical carrier injection can be achieved easily by

single-photon absorption if the photon energy is larger than the bandgap

energy of the material. The phenomenon that causes the transformation of

material property is referred to as the photoconductivity effect. A photocon-

ductivity effect that is initiated by ultrashort optical pulses is referred to as the

ultrafast photoconductivity effect [1].