论文标题
ZNSE的激子 - 孔子上的光学谐波生成
Optical harmonic generation on the exciton-polariton in ZnSe
论文作者
论文摘要
我们研究了半导体ZnSe中1S激子孔子上的光学谐波产生。在光学第二（SHG），第三（THG）和第四（FHG）谐波生成光谱中发现了强烈和光谱窄的激子共振。从线性反射率谱中的激子能量从激子能量转移到较高的能量。在THG和FHG光谱中观察到其他共振，并分配为晶体中入射和反向散射光子的组合。测量旋转各向异性图，并通过使用小组理论与微观考虑的对称分析获得有关光学谐波产生的进一步信息，并通过对称性分析获得所涉及的激子状态。
We study optical harmonic generation on the 1S exciton-polariton in the semiconductor ZnSe. Intense and spectrally narrow exciton resonances are found in optical second (SHG), third (THG), and fourth (FHG) harmonic generation spectra. The resonances are shifted to higher energy by 3.2 meV from the exciton energy in the linear reflectivity spectrum. Additional resonances are observed in the THG and FHG spectra and assigned to combinations of incident and backscattered photons in the crystal. Rotational anisotropy diagrams are measured and further information on the origin of the optical harmonic generation and the involved exciton states is obtained by a symmetry analysis using group theory in combination with a microscopic consideration.
