Effect of permanent dipole moments perpendicular to the molecular long axis on the terahertz absorption in liquid crystals

被引:4
作者
Tanaka, S. [1 ]
Okada, Y. [1 ]
Yamamoto, K. [2 ]
Takanishi, Y. [1 ]
Tani, M. [2 ]
Ishikawa, K. [1 ]
Hangyo, M. [2 ]
Takezoe, H. [1 ]
机构
[1] Tokyo Inst Technol, Dept Organ & Polymer Mat, Meguro Ku, Okayama, Tokyo 1528552, Japan
[2] Osaka Univ, Inst Laser Engn, Suita, Osaka 5650871, Japan
来源
EMERGING LIQUID CRYSTAL TECHNOLOGIES II | 2007年 / 6487卷
关键词
terahertz; time-domain spectroscopy; fourier transform far-infrared; liquid crystals; dipole moment; molecular dynamics;
D O I
10.1117/12.709109
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
We have measured the terahertz (THz) absorption spectra of MBBA (4-Methoxybenzylidene-4 '-n-butylaniline) and its homologues by using THz time-domain and polarized fourier transform far-infrared (FT-IR) spectroscopy, and observed the absorption peak due to the permanent dipole moments perpendicular to the molecular long axis. In addition, we also measured the THz absorption spectra of CCN47 (4 '-trans-butyl-4-cyano-4-trans-heptyl-1,1 '-bicyclohexane) which has a large permanent moment perpendicular to the long axis, by using polarized far-infrared FT-IR spectroscopy. The relation between the vibration modes and the absorption in the THz region is discussed.
引用
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页数:7
相关论文
共 7 条
[1]  
HSIEH CF, 2006 ANN M ROC TLCS
[2]  
*JASCO INC, PROD MAN
[3]  
NISHIZAWA J, 2005, BASIC APPL TERAHERTZ
[4]   Terahertz phonon modes of an intermolecular network of hydrogen bonds in an anhydrous β-D-glucopyranose crystal [J].
Saito, Shigeki ;
Inerbaev, Talgat M. ;
Mizuseki, Hiroshi ;
Igarashi, Nobuaki ;
Note, Ryunosuke ;
Kawazoe, Yoshiyuki .
CHEMICAL PHYSICS LETTERS, 2006, 423 (4-6) :439-444
[5]  
*TLCS COLL WOOST C, FUND FT IR
[6]   Terahertz time-domain spectroscopy studies of the optical constants of the nematic liquid crystal 5CB [J].
Tsai, TR ;
Chen, CY ;
Pan, CL ;
Pan, RP ;
Zhang, XC .
APPLIED OPTICS, 2003, 42 (13) :2372-2376
[7]  
*W COAST AN SERV, TECHN NOT