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Figure 3
Second harmonic generation analysis to show polarity formation in micrometer thin crystal plates of 4-bromo-4′-nitrobiphenyl (BNBP) grown from the melt. White dotted line: central area where growth occurred. (a) Linear optical image of the crystal surrounded by a white dotted line. (b) Presence of polarity (dark green) in both the upper and lower sectors. (c) and (d) effect of phase contrast for the lower and upper sector.

IUCrJ
Volume 3| Part 3| May 2016| Pages 219-225
ISSN: 2052-2525
doi:10.1107/S2052252516006709