Second harmonic generation in NLO polymers excited by Surface Plasmon enhanced electric field induced by femtosecond optical pulsesA. Sugita, K. Suto, A. Ono, W. Inami and Y. KawataEPJ Web of Conferences, 41 (2013) 09008DOI: https://doi.org/10.1051/epjconf/20134109008