Nonlinear optical study of chiral surfaces

Herman I. Yee; Jeff D. Byers; Janice M. Hicks

doi:10.1117/12.180843

21 July 1994 Nonlinear optical study of chiral surfaces

Herman I. Yee, Jeff D. Byers, Janice M. Hicks

Proceedings Volume 2125, Laser Techniques for Surface Science; (1994) https://doi.org/10.1117/12.180843
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

In analogy to the linear optical method optical rotatory dispersion (ORD) which is sensitive to chirality, a surface second harmonic generation (SHG) experiment with plane polarized light is conducted to study a monolayer of chiral molecules at various interfaces. The R- and S- enantiomers of 2,2'-dihydroxy- 1,1'-binaphthyl (BN) adsorbed at the air/water, air/quartz, and liquid/liquid interfaces are studied. Using p-polarized fundamental radiation, the polarization of the SHG signal is rotated by a value (Phi) according to the surface chirality. The rotations are large: tens of degrees from a monolayer of material. R-BN and S-BN give (Phi) values of the same magnitude but opposite signs. The orientation, spectral and concentration dependences of the SHG rotation are explained in terms of the electric dipole-allowed second order nonlinear tensor. The experiments show that while SHG-ORD has origins quite distinct from ordinary ORD, it can be utilized to measure chiral structures of surfaces.

Citation Download Citation

Herman I. Yee, Jeff D. Byers, and Janice M. Hicks "Nonlinear optical study of chiral surfaces", Proc. SPIE 2125, Laser Techniques for Surface Science, (21 July 1994); https://doi.org/10.1117/12.180843

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