Polar alignment of dye molecules in sectors of host lattices revealed by phase sensitive second harmonic generation and scanning pyroelectric microscopy

Hanane Aboulfadl, Matthias Burgener, Jason Benedict, Bart Kahr, Jürg Hulliger

Research output: Contribution to journalArticle

Abstract

Phase sensitive second harmonic generation (PS-SHG) was applied to investigate the effect of polar surface recognition of dye molecules (amaranth and sunset yellow, as well as dimethylaminostyryl-pyridine) in symmetry related sectors of host lattices such as KH 2PO 4 and phthalic acid, respectively. PS-SHG revealed bi-polar states in all cases, meaning that sectors growing in opposite directions feature opposite absolute polarities. Scanning pyroelectric microscopy demonstrated that the dipole moments of amaranth in KH 2PO 4 are pointing towards the growing crystal face. The present work reveals symmetry breaking through anomalous mixed crystal growth to produce physical properties associated with polar axes.

Original languageEnglish (US)
Pages (from-to)4391-4395
Number of pages5
JournalCrystEngComm
Volume14
Issue number13
DOIs
StatePublished - Jul 7 2012

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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