Title :
Long-wavelength optical properties in an ionic-type phononic crystal
Author :
Nai-ben Ming ; Yan-qing Lu
Author_Institution :
Nat. Lab. of Solid State Microstructures, Nanjing Univ., China
Abstract :
We discuss the long wavelength optical properties of a LiNbO/sub 3/ (LN) ferroelectric superlattice composed of laminar domains with spontaneous polarization perpendicular to domain walls. This periodic elastic medium is a one-dimensional (1D) phononic crystal with ferroelectric domains and piezoelectric coefficients as the modulation parameter. In such a superlattice, the boundaries of neighboring domains are charged periodically. The domain boundary can be viewed not only as the concentration of mass but also as the charge center. This phononic crystal can thus be viewed as a 1D diatom chain with positive and negative "ions" connected periodically, similar to a real ionic crystal. Therefore; this kind of superlattice is termed an ionic-type photonic crystal.
Keywords :
eigenvalues and eigenfunctions; electric domain walls; electric domains; ferroelectric materials; lithium compounds; periodic structures; photonic band gap; polaritons; superlattices; 1D diatom chain; LiNbO/sub 3/; dielectric constant; domain walls; eigenfrequencies; ferroelectric superlattice; ionic-type phononic crystal; ionic-type photonic crystal; laminar domains; long wavelength optical properties; negative domains; one-dimensional phononic crystal; periodic elastic medium; photon phonon interaction; piezoelectric coefficients; polariton dispersion curve; polariton mode; positive domains; spontaneous polarization; vibration mode; Crystal microstructure; Dielectric constant; Electromagnetic wave absorption; Ferroelectric materials; Frequency; Optical refraction; Optical superlattices; Optical variables control; Phonons; Photonic crystals;
Conference_Titel :
Lasers and Electro-Optics, 2001. CLEO/Pacific Rim 2001. The 4th Pacific Rim Conference on
Conference_Location :
Chiba, Japan
Print_ISBN :
0-7803-6738-3
DOI :
10.1109/CLEOPR.2001.967755
