Strong guided mode resonant local field enhanced visible harmonic generation in an azo-polymer resonant waveguide grating

Jian Hung Lin, Chun Yen Tseng, Ching Ting Lee, Jeff F. Young, Hung Chih Kan, Chia Chen Hsu

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Guided mode resonance (GMR) enhanced second- and third-harmonic generation (SHG and THG) is demonstrated in an azo-polymer resonant waveguide grating (RWG), comprised of a poled azo-polymer layer on top of a textured SU8 substrate with a thin intervening layer of TiO2. Strong SHG and THG outputs are observed by matching either incoming fundamental- or out-going harmonic-wavelength to the GMR wavelengths of the azo-polymer RWG. Without the azo-polymer coating, pure TiO2 RWGs, do not generate any detectable SHG using a fundamental beam peak intensity of 2 MW/cm2. Without the textured TiO2 layer, a planar poled azo-polymer layer results in 3650 times less SHG than the full nonlinear RWG structure under identical excitation conditions. Rigorous coupled-wave analysis calculations confirm that this enhancement of the nonlinear conversion is due to strong local electric fields that are generated at the interfaces of the TiO2 and azo-polymer layers when the RWG is excited at resonant wavelengths associated with both SHG and THG conversion processes.

Original languageEnglish
Pages (from-to)2790-2797
Number of pages8
JournalOptics Express
Volume22
Issue number3
DOIs
Publication statusPublished - 2014 Feb 10

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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