Interference effects in high-order harmonics from colloidal perovskite nanocrystals excited by an elliptically polarized laser
Interference effects in high-order harmonics from colloidal perovskite nanocrystals excited by an elliptically polarized laser
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椭圆偏振激光激发胶体钙钛矿纳米晶的高次谐波干涉效应
DOI：
10.1103/physrevmaterials.5.016001
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发表时间：
2021-01
影响因子：
3.4
通讯作者：
Kotaro Nakagawa;H. Hirori;Yasuyuki Sanari;F. Sekiguchi;R. Sato;M. Saruyama;T. Teranishi;Y. Kanemitsu
中科院分区：
文献类型：
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作者：
Kotaro Nakagawa;H. Hirori;Yasuyuki Sanari;F. Sekiguchi;R. Sato;M. Saruyama;T. Teranishi;Y. Kanemitsu
卤化物钙钛矿纳米晶体可以通过改变纳米晶体的组成和尺寸在很大的波长范围内调节其高效发光，因此是一种适合于光子器件的材料。在这里，我们报道了溶液处理的钙钛矿纳米晶薄膜在强中红外激光激发下的高次谐波产生。我们观测到了高达13次的谐波，这是远高于带隙能量的紫外光。利用椭圆偏振激光，分析了样品结构对五次谐波强度的影响。研究还发现，薄膜中纳米晶取向的随机性导致了由于不同相纳米晶发射的谐波之间的干扰而导致的谐波强度的降低。我们从纳米晶体薄膜中观察到的高次谐波为强度调制器的发展开辟了一条道路，这种强度调制器可以通过改变激发椭圆度来简单地调谐。
Halide perovskite nanocrystals are suitable materials for photonic devices because their highly efficient luminescence can be tuned over a wide wavelength range by changing the nanocrystal composition and size. Here, we report on the high-order harmonic generation in a solution-processed perovskite ${\mathrm{CsPbBr}}_{3}$ nanocrystal film that is excited by a strong midinfrared laser. We observe harmonics up to the 13th order, which is ultraviolet light well above the band-gap energy. By using elliptically polarized laser light, we analyze the influence of the sample structure on the intensity of the 5th harmonic. It is also found that the randomness in the orientation of the nanocrystals in the film induces a reduction in the harmonic intensities due to the interference among the harmonics emitted from nanocrystals with different phases. Our observation of high-order harmonics from nanocrystal films opens a way towards the development of an intensity modulator that can be tuned simply by changing the excitation ellipticity.