论文标题
调整卤化物钙钛矿纳米颗粒中FANO共振的超快响应
Tuning the Ultrafast Response of Fano Resonances in Halide Perovskite Nanoparticles
论文作者
论文摘要
纳米系统的基本光体物理的完全控制频率高达很少，这是可调和超快纳米光子设备和超材料的关键。在这里，我们结合了对卤化物钙钛矿纳米颗粒的光学性质的几何和超快控制，这构成了纳米光子学的突出平台。跨半导体间隙的游离载体的脉冲光注射导致对远场电磁特性的次秒修改，该特性完全由系统的几何形状控制。当调整纳米颗粒尺寸以实现窄带激子和几何控制的MIE共振之间的重叠时，透射率的超快调节与在不同尺寸的纳米颗粒中通常在散装系统中和薄膜中观察到的纳米颗粒中通常观察到的超快调节。化学，几何和超快调整之间的相互作用提供了一个额外的控制参数，并影响纳米 - 安妮纳斯和超快光学开关。
The full control of the fundamental photophysics of nanosystems at frequencies as high as few THz is key for tunable and ultrafast nano-photonic devices and metamaterials. Here we combine geometrical and ultrafast control of the optical properties of halide perovskite nanoparticles, which constitute a prominent platform for nanophotonics. The pulsed photoinjection of free carriers across the semiconducting gap leads to a sub-picosecond modification of the far-field electromagnetic properties that is fully controlled by the geometry of the system. When the nanoparticle size is tuned so as to achieve the overlap between the narrowband excitons and the geometry-controlled Mie resonances, the ultrafast modulation of the transmittivity is completely reversed with respect to what is usually observed in nanoparticles with different sizes, in bulk systems and in thin films. The interplay between chemical, geometrical and ultrafast tuning offers an additional control parameter with impact on nano-antennas and ultrafast optical switches.
