6 March 2013 Second harmonic generation in non-electrically-poled NLO polymers excited by surface plasmon enhanced electric field
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We will report second harmonics generations (SHG) in nonlinear optical (NLO) polymers excited by Surface Plasmon (SP) enhanced fields. The surface plasmon polariton was excited in an attenuated total reflection geometry having the Kretchmann configuration. Here, the NLO interactions occurred in the thin films of the NLO polymers, consisting of Disperse Red 1 as guest chromophores and PMMA as host, coated on Ag thin films. Our experimental results indicated that NLO polymers emitted strong SHG signals in the SP resonance conditions. The SHG intensities from NLO polymer coated Ag films were more than 10 times higher than those of the uncoated Ag films. The measurements were conducted for the polymer films with different thickness between 10 and 100 nm. All of the samples with different polymer thickness exhibited the SHG signals at its SP resonance condition that depends on the film thicknesses. The highest SHG conversion efficiency was recorded from the sample with 40 nm film thicknesses. The p-polarized pump beams gave the highest SHG conversion efficiency while the s-polarized ones gave almost no signals. On the other hand, the polarizations of the SH signals were highly oriented in the direction of the p-polarizations. The SP-enhanced field attracts a lot of interests as light sources for sub-diffraction-limit imaging. The SP can be excited only in the regions lower than surface plasma frequencies peculiar to the metals. The present frequency conversion technologies for the SP enhanced fields in the NLO polymers will extend the frequency regions available for the sub-diffraction-limit imaging.
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Atsushi Sugita, Atsushi Sugita, Kaname Suto, Kaname Suto, Tomoyuki Sato, Tomoyuki Sato, Atsushi Ono, Atsushi Ono, Wataru Inami, Wataru Inami, Yoshimasa Kawata, Yoshimasa Kawata, Shigeru Tasaka, Shigeru Tasaka, "Second harmonic generation in non-electrically-poled NLO polymers excited by surface plasmon enhanced electric field", Proc. SPIE 8622, Organic Photonic Materials and Devices XV, 86220B (6 March 2013); doi: 10.1117/12.2002949; https://doi.org/10.1117/12.2002949

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