LARGE AND STABLE 2ND-HARMONIC GENERATION IN A CRYSTALLINE PHASE OF A FERROELECTRIC LIQUID-CRYSTAL

被引:12
|
作者
SPRUNT, S [1 ]
NACIRI, J [1 ]
RATNA, BR [1 ]
SHASHIDHAR, R [1 ]
BIHARI, B [1 ]
KUMAR, J [1 ]
TRIPATHY, SK [1 ]
机构
[1] UNIV LOWELL,DEPT CHEM,CTR ADV MAT,LOWELL,MA 01854
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D O I
10.1063/1.113648
中图分类号
O59 [应用物理学];
学科分类号
摘要
Second harmonic generation (SHG) has been studied in a nitro-substituted ferroelectric liquid crystal cooled from the smectic-C* into a three-dimensional crystalline (K) phase in an applied electric field. The SHG efficiency in the K phase is found to be deff≳4.5 pm/V, about 25 times the value in the SmC* phase, and, unlike the SmC* case, remains constant in zero field for ≳25 h. A quantitative analysis of the polarization dependence of the SHG reveals that the dominant d coefficients contributing to the measured signal differ for the two phases, and that the orientation of the liquid-crystal director in the K phase is modulated in one dimension.© 1995 American Institute of Physics.
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页码:1443 / 1445
页数:3
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