Twist-Grain-Boundary Structure in the $B4$ Phase of a Bent-Core Molecular System Identified by Second Harmonic Generation Circular Dichroism Measurement

Twist-Grain-Boundary Structure in the $B 4$ Phase of a Bent-Core Molecular System Identified by Second Harmonic Generation Circular Dichroism Measurement

Fumito Araoka, N. Y. Ha, Yoshitaka Kinoshita, Byougchoo Park, J. W. Wu, and Hideo Takezoe

Phys. Rev. Lett. 94, 137801 – Published 7 April 2005

Abstract

Second harmonic generation circular dichroism (SHG CD) measurements are performed on the $B 4$ phase of a bent-core molecular system. Numerical analysis of SHG CD incorporating magnetic-dipole as well as electric-dipole interaction shows that the $B 4$ phase is in a twist-grain-boundary structure with the helical axis along the bent direction of the molecules. The result is extremely important in the sense that achiral molecules are spontaneously optically resolved, i.e., deracemization, the chiral domains of which give rise to huge chiral nonlinear optical effect.

Received 27 April 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.137801

Authors & Affiliations

Fumito Araoka¹, N. Y. Ha², Yoshitaka Kinoshita¹, Byougchoo Park^1,†, J. W. Wu², and Hideo Takezoe^1,*

¹Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
²Department of Physics, Ewha Womans University, Seoul 120-750, Korea

^*Email address: htakezoe@o.cc.titech.ac.jp Electronic address: http://www.op.titech.ac.jp/gs/takezoe/index.html
^†Present address: Department of Electrophysics, Kwangwoon University, Seoul 139-701, Korea.

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Vol. 94, Iss. 13 — 8 April 2005

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