Fedorov Vladimir V, Bolshakov Alexey, Sergaeva Olga, Neplokh Vladimir, Markina Daria, Bruyere Stephanie, Saerens Grégoire, Petrov Mihail I, Grange Rachel, Timofeeva Maria, Makarov Sergey V, Mukhin Ivan S
Alferov University (formerly St. Petersburg Academic University), Khlopina 8/3, 194021, St. Petersburg, Russia.
Peter the Great St. Petersburg Polytechnic University, Politekhnicheskaya 29, 195251, St. Petersburg, Russia.
ACS Nano. 2020 Aug 25;14(8):10624-10632. doi: 10.1021/acsnano.0c04872. Epub 2020 Aug 12.
Engineering of nonlinear optical response in nanostructures is one of the key topics in nanophotonics, as it allows for broad frequency conversion at the nanoscale. Nevertheless, the application of the developed designs is limited by either high cost of their manufacturing or low conversion efficiencies. This paper reports on the efficient second-harmonic generation in a free-standing GaP nanowire array encapsulated in a polymer membrane. Light coupling with optical resonances and field confinement in the nanowires together with high nonlinearity of GaP material yield a strong second-harmonic signal and efficient near-infrared (800-1200 nm) to visible upconversion. The fabricated nanowire-based membranes demonstrate high flexibility and semitransparency for the incident infrared radiation, allowing utilizing them for infrared imaging, which can be easily integrated into different optical schemes without disturbing the visualized beam.
纳米结构中非线性光学响应的工程设计是纳米光子学的关键课题之一，因为它能够在纳米尺度上实现广泛的频率转换。然而，已开发设计的应用受到其制造成本高或转换效率低的限制。本文报道了在封装于聚合物膜中的独立GaP纳米线阵列中实现的高效二次谐波产生。光与纳米线中的光学共振耦合以及场限制，再加上GaP材料的高非线性，产生了强烈的二次谐波信号以及从近红外（800 - 1200 nm）到可见光的高效上转换。所制备的基于纳米线的膜对入射红外辐射表现出高柔韧性和半透明性，使其可用于红外成像，并且能够轻松集成到不同的光学方案中而不干扰可视化光束。
