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Optics Letters

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  • Vol. 25, Iss. 15 — Aug. 1, 2000
  • pp: 1107–1109

Atomic-force microscope observation and molecular-scale flattening of the single-crystal surface of 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST)

H. Nanjo, P. Qian, N. Sanada, T. M. Suzuki, H. Takahashi, H. Ito, and K. Komatsu  »View Author Affiliations


Optics Letters, Vol. 25, Issue 15, pp. 1107-1109 (2000)
http://dx.doi.org/10.1364/OL.25.001107


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Abstract

The surface of an organic electro-optic crystal tends to be covered with a degenerate rough layer, which may cause light scattering or unfavorable transmission of light. We demonstrate a novel method of removing this layer and flattening the (001) surface of a 4-dimethylamino- N -methyl-4-stilbazolium tosylate (DAST) crystal on a molecular scale by applying suitable force on the tip of an atomic-force microscope (AFM). When the loading force on the AFM tip is kept near 10 nN, the DAST molecules can be removed layer by layer. This method produced a large, flat terrace of 250,000 nm2 , and the molecular-scale flatness of this area was confirmed by AFM observation.

© 2000 Optical Society of America

OCIS Codes
(000.2170) General : Equipment and techniques
(190.4400) Nonlinear optics : Nonlinear optics, materials
(240.4350) Optics at surfaces : Nonlinear optics at surfaces
(240.5450) Optics at surfaces : Polishing
(240.5770) Optics at surfaces : Roughness
(240.6700) Optics at surfaces : Surfaces

Citation
H. Nanjo, P. Qian, N. Sanada, T. M. Suzuki, H. Takahashi, H. Ito, and K. Komatsu, "Atomic-force microscope observation and molecular-scale flattening of the single-crystal surface of 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST)," Opt. Lett. 25, 1107-1109 (2000)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-25-15-1107


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