Appl. Phys. Lett. 102, 203304 (2013).
Arunandan Kumar, Priyanka Tyagi, Ritu Srivastava, D. S. Mehta, M. N. Kamalasanan.
Center for Organic Electronics, National Physical Laboratory (Council of Scientific and Industrial Research), Dr. K. S. Krishnan Road, New Delhi 110012, India and
Instrument Design Development Center, Indian Institute of Technology Delhi, Hauz Khas New Delhi, 110016, India
Abstract
The energy transfer process between surface plasmons and excitons was studied by varying the filling fraction of gold (Au) nano-clusters (NCs) and by placing a spacer of different thickness between Au NC and organic semiconductor layer. The intensity enhancement has occurred for 10%-50% filling fractions and 4-14 nm spacer thicknesses. Energy transfermechanism was found to switch from Forster type to surface type by increase in filling fraction. Transverse electric field for Au NCs was simulated and we observed that for filling fraction <30%, Au NCs behave like 1-dimensional dipole and for >60%, they behave like 2-dimensional dipoles.
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