Berlin 2005 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HL: Halbleiterphysik

HL 37: Photonische Kristalle I

HL 37.4: Vortrag

Montag, 7. März 2005, 10:45–11:00, TU P270

Ferroelectric Liquid Crystals as tunable optical stop-band materials — •Wolfgang Haase¹, Vladimir Bezborodov², Valery Lapanik², Fedor Podgornov¹, and Artisom Lapanik¹ — ¹Teschnische Universität Darmstadt, Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Petersenstr. 20, D-64287 Darmstadt, Germany — ²Institute of Applied Physics Problems, Minsk 220064, Belarus

Ferroelectric Liquid Crystals (FLCs) have unique combination of optical and electrooptical properties (fast response time and periodically modulated structure) which makes them attractive for application as tunable stop band materials. As it was showed in our early works, the FLCs was successfully utilised for tuneable laser generation in dye-doped samples at the edge of the photonic band gap and its tunability due to temperature and the electric field was demonstrated. In the present report, we will demonstrate new type of the FLC mixtures with very high birefringence ( around 0.3). These materials are based on phenyl and biphenyl pirimidines and a four ring chiral compound with high optical anisotropy. The combination of these components allowed us to have chiral SmC phase in wide temperature range, vary the helical pitch over the whole optical band as well as greatly increase its birefringence. In addition, these mixtures have excellent alignment properties (both for planar and for homeotropic orientation). The lasing properties of these mixtures doped with laser dyes (DCM, Rhodamine 590) will be discussed.