Second-harmonic generation in pure p-nitroaniline and in composites with polystyrene by flash evaporation

Youngmo Hwang, Bruce A. Garetz, Yoshiyuki Okamoto

Research output: Contribution to journalArticle

Abstract

A new metastable phase of p-nitroaniline has been formed by flash evaporation from a toluene solution. This phase generates extremely strong second-harmonic radiation at 532 nm when illuminated with a near-infrared laser beam at 1064 nm. This observation is surprising since the stable crystalline phase exhibits no second harmonic and suggests that the new structure lacks a center of symmetry. The second-harmonic intensity decays over several days for the pure compound but remains unchanged over 3 months for the composite with polystyrene. Such nonlinear-optical materials are important for optoelectronic devices such as electro-optic modulators and switches used in telecommunications.

Original languageEnglish (US)
Pages (from-to)487-489
Number of pages3
JournalOptics Letters
Volume17
Issue number7
DOIs
StatePublished - Apr 1992

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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