• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.18 no.11
• /
• pp.1048-1055
• /
• 2005

The formula to calculate a variation of optical path length of single crystal by the electric field was derived by this study. The formula was applied to $Bi_{12}SiO_{20}$ single crystal. The results are as follows. In case of the applied electric field in the body diagonal direction and the passing light along the same direction, the variation of optical path length had the largest value. The symmetry of the space distribution of optical path length satisfied $E3C_2\;8C_3$, the set of elements of the symmetry of $Bi_{12}SiO_{20}$ single crystal. The property which gave the largest influence to the variation of optical path length is the strain of length by the Inverse piezoelectric effect. The second influence, is the variation of the refractive index by the electro-optic effect. The variation of optical path length by the inverse piezoelectric effect and by the electro-optic effect have a reverse sign each other.

• Journal of Sensor Science and Technology
• /
• v.10 no.3
• /
• pp.163-172
• /
• 2001

Fiber optic BOTDA (Brillouin Optical Time Domain Analysis) sensor was developed to be able to detect intrusion effect through several ten kilometer optical fiber. Fiber optic BOTDA sensor was constructed with 1 laser diode and 2 electro-optic modulators. The intrusion detection experiment was peformed by the strain inducing set-up installed on an optical table to simulating an intrusion effect. In the result of this experiment, the intrusion effect was well detected as the distance resolution of 3 m through the fiber length of about 4.81 km during 1.5 seconds.

• Proceedings of the Polymer Society of Korea Conference
• /
• 2006.10a
• /
• pp.11-12
• /
• 2006

Incorporation of chromophores into multi-chromophore-containing dendrimers is shown to lead to a significant enhancement in electro-optic activity. These results are reasonably well simulated by pseudo-atomistic Monte Carlo calculations that permit dendrimers to interpenetrate (entangle). Calculations also lead to the correct prediction of material densities. An even greater enhancement in electro-optic activity is observed when such dendrimer materials are doped with a second chromophore. This latter effect may reflect an Ising-lattice-type phenomenon where one chromophore impacts the ordering of the other and vice versa.

• Analytical Science and Technology
• /
• v.6 no.2
• /
• pp.231-238
• /
• 1993

The thermal behavior of binder in multi-layer actuator has an effect on the properties of actuator. Binder burn-out process and thermal degradation mechanism of PNN-PZT/Acrylic binder were analyzed by FTIR, DSC, TGA. Binder was burnt out by two step. In oxygen atomsphere, thermal degradation was activated and final residue was minimized to 5%.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2002.08a
• /
• pp.910-913
• /
• 2002

We have achieved an improved stability of an analog electro-optic effect in FLC/polymer composite films. The optimization of device depends on both the composition of the FLC/polymer mixture and the energy of UV irradiation. This device exhibits continuous gray scales and the mechanical stability against external forces.

• Korean Journal of Optics and Photonics
• /
• v.16 no.4
• /
• pp.376-383
• /
• 2005

We designed and fabricated integrated-optic tunable polarization controllers based on $LiNbO_3$ with the Ti-indiffused waveguide along the y-axis utilizing the electro-optic effect. The device consists of $TE↔TM$ mode converters and TE/TM phase shifters. We analyzed the operation principles of each device utilizing transfer matrices based on a Jones matrix and simulated shifting of the center wavelength by inducing voltage. We confirmed experimentally that the fabricated devices control the tunability of the center wavelength and the input SOP.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.19 no.5
• /
• pp.427-431
• /
• 2006

We have studied electro-optic characteristics of reflective $45^{\circ}$ twisted nematic liquid crystal display which implement the new LC orientation using of in-cell retarder film. For the embodiment of reflective liquid crystal display, essentially the optic compensation films was always needed and attached to the outside of glass substrate. In our study, these optic compensation film were not employed in reflective LC cell. On other hand we have employed the in-cell retarder to substitute the optic compensation film and were able to orient the LC molecules using this in-cell retarder. So we have developed the reflective LC cell that has good optical performances without any additional coating process on the in-cell retarder.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2009.11a
• /
• pp.190-190
• /
• 2009

Liquid crystals (LCs) which utilize the phase above blue phase temperature range are also known to format the optically nanostructured composites devices based on Kerr effect these days. We report electro-optical characteristics of the polymer-stabilized cholestric LCs by using UV curable monomers at the different temperatures such as blue phase temperature range, blue phase-isotropic transition temperature, and isotropic temperature range. The devices exhibit different electro-optic characteristics.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2002.08a
• /
• pp.467-470
• /
• 2002

We report on an analog electro-optic effect in a nonchiral smectic C (NSC) liquid crystal (LC) mode with negative dielectric anisotropy in a transverse electrode configuration. Two-dimensional numerical simulations are executed to evaluate the display performances. The analog gray scales in the NSC LC mode are obtained in a dielectrically driving scheme.

• Korean Journal of Optics and Photonics
• /
• v.19 no.3
• /
• pp.187-192
• /
• 2008

The design and analysis of a novel photonic crystal electro-optic modulator are presented in this paper. The device incorporates an electro-optic (EO) polymer slot waveguide into the center of a silicon photonic crystal waveguide. In this device, strong optical confinement in the EO polymer core and small group velocity from the photonic crystal structure provide a surprise enhancement of the EO effect.