Nanoscale consecutive self-assembly of thin-film molecular materials for electrooptic switching. Chemical streamlining and ultrahigh response chromophores

Milko E. Van der Boom, Peiwang Zhu, Guennadi Evmenenko, Joshua E. Malinsky, Wenbin Lin, Pulak Dutta, Tobin Jay Marks*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

A broadly applicable approach to formation of self-assembled organic electrooptic superlattices for high-speed switching is reported. This two-step "one-pot" method involves (i) layer-by-layer covalent self-assembly of intrinsically acentric monolayers of a new high-hyperpolarizability donor-acceptor aminophenylbenzothiazolpyridinium chromophore (β(0.65 eV)calcd = 1620 × 10-30 cm5 esu-1) on hydrophilic substrates and (ii) in-situ chromophore deprotection concurrent with self-limiting "capping"/planarization of each chromophore layer with octachlorotrisiloxane. The resulting organic films are characterized using a combination of physicochemical methodolgies including synchrotron X-ray specular reflectivity, angle-dependent polarized second harmonic generation spectroscopy, optical spectrometry, X-ray photoelectron spectroscopy, and advancing contact angle measurements. The superlattices exhibit very large second-order responses, χ(2) ≈ 370 pm/V, and a large macroscopic electrooptic coefficient, r33 ≈ 120 pm/V, is estimated at λ0 = 1064 nm.

Original languageEnglish (US)
Pages (from-to)3704-3707
Number of pages4
JournalLangmuir
Volume18
Issue number9
DOIs
StatePublished - Apr 30 2002

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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