Czaplicki Robert, Kiviniemi Antti, Laukkanen Janne, Lehtolahti Joonas, Kuittinen Markku, Kauranen Martti
Opt Lett. 2016 Jun 15;41(12):2684-7. doi: 10.1364/OL.41.002684.
We investigate the role of surface-lattice resonances (SLRs) in second-harmonic generation (SHG) from arrays of metal nanoparticles. The SLRs affect the generated signal when the sample is rotated away from normal incidence. The adjustment of the incident angle tunes the SLRs to the fundamental wavelength for SHG and improves the quality of the resonance for better resonance enhancement of SHG. Compared to normal incidence, an enhancement by a factor of 10 is observed. However, at certain incident angles, the enhancement is interrupted by diffraction anomalies, which redirect light into the substrate, increasing radiation damping and compromising the quality of the resonance.
我们研究了表面晶格共振（SLRs）在金属纳米颗粒阵列二次谐波产生（SHG）中的作用。当样品从正入射旋转时，表面晶格共振会影响产生的信号。调整入射角可将表面晶格共振调谐到二次谐波产生的基波波长，并改善共振质量，以实现更好的二次谐波产生共振增强。与正入射相比，观察到增强了10倍。然而，在某些入射角下，增强会被衍射异常中断，衍射异常会将光重定向到基底中，增加辐射阻尼并损害共振质量。
