Optical properties of an ionic-type phononic crystal
An ionic-type phononic crystal composed of two ferroelectric media with opposite spontaneous polarization aligned periodically in a superlattice structure was studied theoretically and experimentally. The coupling between vibrations of the superlattice and the electromagnetic waves results in various long-wavelength optical properties, such as microwave absorption, dielectric abnormality, and polariton excitation, that exist originally in ionic crystals. The results show that this artificial crystal structure can be used to simulate the microscopic physical processes in real crystals.
Lu
Y
National Laboratory of Solid State Microstructures, Department of Electronic Science and Engineering, Nanjing University, Nanjing 210093, People's Republic of China.
Zhu
Y
Chen
Y
Zhu
S
Ming
N
Feng
YJ