[Best Poster]

Title:
Phase of the second order nonlinear susceptibility at the interface of indium tin oxide/organic semiconductor


Speaker(s):
Muhammad Samir Ullah^1,3, Siti Zulaikha Ngah Demon⁴, Kazuki Matsumoto¹, Khuat Thi Thu Hien¹, Goro Mizutani¹ and Harvey Rutt<sup>2

1</sup>School of Materials Science, Japan Advanced Institute of Science and Technology, Ishikawa 923-1292, Japan
²School of Electronics and Computer Science, University of Southampton, Southampton, SO17 1BJ,U.K.
³Department of Physics, Bangladesh University of Engineering and Technology, Dhaka 1000, Bangladesh
⁴Department of Physics, Center of Defence Foundation Studies, National Defense University of Malaysia, Kuala Lumpur, 53 000, Malaysia

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Abstract:
We have studied the phase of the second order nonlinear susceptibility at the interface of organic semiconductor with the indium tin oxide (ITO) through the nonlinear optical interferometry technique. In order to produce second harmonic generation (SHG) interference pattern, we used an α-SiO₂ (0001) crystal as the nonlinear optical reference SHG source. The variation of the phase delay between two SHG sources produces an interference pattern in air from which phase of the second order nonlinear optical susceptibility can measured. The phase shift was computed at the interface of ITO/organic semiconductor with respect to the phase of the bare ITO.