Photoinduced diffraction grating in hybrid artificial molecule.
Photoinduced diffraction grating in hybrid artificial molecule.
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DOI：
10.1364/oe.20.001219
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发表时间：
2012-01
期刊：
影响因子：
3.8
通讯作者：
Zhi-Hong Xiao;L. Zheng;Hongzhen Lin
中科院分区：
文献类型：
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作者：
Zhi-Hong Xiao;L. Zheng;Hongzhen Lin
对由半导体量子点（SQD）和金属纳米颗粒（MNP）组成的三能级梯形混合人工分子中的光致衍射光栅进行了理论研究。SQD和MNP通过库仑相互作用耦合。在强耦合场的作用下，探测吸收消失，表明存在电磁感应透明效应。基于这种EIT效应，在驻波耦合场的作用下，可以实现衍射光栅。结果表明，由于MNP的存在，衍射光栅的效率大大提高。此外，可以通过调节SQD和MNP之间的相互作用强度来控制衍射效率。获得了接近纯位相光栅，具有高透过率和高衍射效率，最高可达33%。
Photoinduced diffraction grating is theoretically investigated in a three-level ladder-type hybrid artificial molecule comprised of a semiconductor quantum dot (SQD) and a metal nanoparticle (MNP). The SQD and the MNP are coupled via the Coulomb interaction. The probe absorption vanishes under the action of a strong coupling field, indicating an effect of electromagnetically induced transparency (EIT). Based on this EIT effect, diffraction grating is achievable when a standing-wave coupling field is applied. It turns out that the efficiency of diffraction grating is greatly improved due to the existence of the MNP. Furthermore, the diffraction efficiency can be controlled by tuning the interaction strength between the SQD and the MNP. Nearly pure phase grating is obtained, showing high transmissivity and high diffraction efficiency up to 33%.