Figure 2From: Improvement of photon extraction efficiency of GaN-based LED using micro and nano complex polymer structures Three-dimensional atomic force microscopy image (inset is a 2 dimensional image) of a micro- and nanoscale complex structure of (a) the N-faced GaN surface, (b) replicated polydimethylsiloxane stamp, and (c) surface of light-emitting diode device after the nanoimprint lithography process.Back to article page