DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click
HERE to register or log in.
Accession Number:
ADA279988
Title:
Development of Ferroelectric Liquid Crystals with Enhanced Nonlinear Optical Properties.
Descriptive Note:
Final rept. 15 Jul 93-15 Apr 94,
Corporate Author:
DISPLAYTECH INC BOULDER CO
Report Date:
1994-04-24
Pagination or Media Count:
26.0
Abstract:
During our Phase I research, we advanced materials synthesis and evaluation techniques needed to develop ferroelectric liquid crystals into a useful second-order nonlinear optical material. We developed a technique for determining the second-order nonlinear susceptibility by measuring the electro- optic coefficient r22 at 633 nm, using modulation frequencies between 100 KHz- 100 MHz. We evaluated two specially synthesized FLCs by measuring their r22 coefficients previously existing MX-5679 and recently synthesized W-399, both based on a nitrobenzene hyperpolarizable moiety. Results show an increasing r22 with increasing spontaneous polarization. We also partially evaluated a new FLC material, W-371, with an ortho-situated nitroaniline hyperpolarizable moiety. Since the liquid crystalline and the linear and nonlinear materials parameters FLCs have a temperature dependence, we examined existing FLC polymers for a FLC to glass phase and discovered a polymericFLC system that potentially could be used to reduce temperature dependent materials properties. Our FLC synthesis efforts concentrated on synthesis of Hoffman-LaRoche compounds roche 1 and roche 2. Unfortunately, we were unable to duplicate their synthesis and instead developed an alternative core that could yield FLCs with a higher second-order nonlinear susceptibility. Ferroelectric liquid crystal, Second-order nonlinear optical material.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE
