Dynamic amplification of light signals in photorefractive ferroelectric liquid crystalline mixtures.
نویسندگان
چکیده
The photorefractive effect in photoconductive ferroelectric liquid crystals that contain photoconductive chiral compounds was investigated. Terthiophene compounds with chiral structures were chosen as the photoconductive chiral compounds, and they were mixed with an achiral smectic C liquid crystal. The mixtures exhibit the ferroelectric chiral smectic C phase. The photorefractivity of the mixtures was investigated by two-beam coupling experiments. It was found that the ferroelectric liquid crystals containing the photoconductive chiral compound exhibit a large gain coefficient of over 1200 cm(-1) and a fast response time of 1 ms. Real-time dynamic amplification of an optical image signal of over 30 fps using the photorefractive ferroelectric liquid crystal was demonstrated.
منابع مشابه
Experimental Investigations into Interactions and Collective Behavior in Protein / Polymer Mixtures and Granular Rods
Experimental Investigations into Interactions and Collective Behavior in Protein/Polymer Mixtures and Granular Rods A dissertation presented to the Faculty of the Graduate School of Arts and Sciences of Brandeis University, Waltham, Massachusetts by Joshua David Bloustine Interactions and collective behavior are studied for two examples of protein/polymer mixtures and for dynamic and static ens...
متن کاملAntiferroelectric dielectric relaxation processes and the interlayer interaction in antiferroelectric liquid crystals
Antiphase relaxation process of antiferroelectric phase is investigated in binary mixtures of antiferroelectric and ferroelectric liquid crystalline compounds. It is found that the frequency of the antiphase mode ranges from 2 to 4 MHz, being one of the fastest collective processes reported so far. This can be exploited in a photonic switch with a submicrosecond response time. However, the freq...
متن کاملSecond-harmonic light generation in pyroelectric liquid-crystal polymers
Pyroelectric liquid-crystal polymers were prepared by photopolymerization of binary mixtures of two monomers that exhibit a smectic C* phase: A2c, 49-$(R)-(2)-2-[(10-acryloyloxy)decyl]oxy%-3-nitrophenyl 4-{48[(11-acryloyloxy)undecyloxy]phenyl%benzoate and A1b, 49-((R)-(1)-2-octyloxy)-39-nitro phenyl 4-(48-@(11acryloyloxy)undecyloxy]phenyl) benzoate. Both liquid-crystal monomers have a NO2 subst...
متن کاملDetermination of the size distribution of monodesperse and bidisperse mixtures of spherical particles in the nanometer and submicron size range by applying cumulant analysis and contin algorithm in dynamic light scattering
Determination of particle size is one of the major needs in the industry and biotechnology. Dynamic light scattering (DLS) is a widely used technique for determining size distribution of spherical particle in nanometer and submicron size range. In this method, there are different algorithms for determining the size and size distribution of particles, which are selected according to the required...
متن کاملSpatial soliton pairs in an unbiased photovoltaic-photorefractive crystal circuit
: Optical separate spatial dark and bright soliton pairs in steady-state case in one dimension, for a series circuit consisting of two-photon photorefractive (PR) crystal are investigated. Each crystal can be supported the spatial soliton, and at least one must be photovoltaic. The two solitons are known collectively as separate spatial soliton pairs with dark–dark, bright–dark and bright–brigh...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Faraday discussions
دوره 174 شماره
صفحات -
تاریخ انتشار 2014