近日，吉林大学李爱军团队研究了自生相干下量子点-分子体系涡旋光诱导的二维不对称衍射。相关论文于2025年12月16日发表在《物理评论A》杂志上。

量子点分子凭借其源于量子限制效应与隧穿效应的独特光电性质，不仅在先进光子学应用中展现出巨大潜力，还具备纳米尺度的本征优势，这对集成微型器件的发展至关重要。

研究组提出一种通过在量子点分子系统中引入自发产生相干效应与双隧穿通道，实现高强度二维非对称电磁诱导衍射光栅的方案。理论分析表明，自发产生相干效应的存在能显著增强高阶衍射的强度与效率。进一步通过调控涡旋光束的轨道角动量与束腰参数，研究组不仅放大了非对称衍射的差异性并提升三阶衍射峰效率，还能仅通过反转轨道角动量方向实现衍射峰位置与对称位置的无损耗空间互换。

此外，调节量子点间隧穿强度可使最大三阶衍射强度提升三个数量级，达到对称位置观测值的十倍以上。这些结果充分发挥了量子点分子的纳米尺度优势与可调控特性，为紧凑型光子器件的实现提供了坚实基础，并为光学衍射神经网络及电磁诱导量子全息术等潜在应用开辟了新路径。

附：英文原文

Title: Two-dimensional asymmetric diffraction induced by vortex light in quantum-dot-molecule systems under spontaneously generated coherence

Author: Yiming Xu, Yiming Zhang, Shenwei Li, Leyu Li, Zhiwei Men, Aijun Li

Issue&Volume: 2025/12/16

Abstract: Quantum dot molecules (QDMs), with their unique optoelectronic properties derived from quantum confinement and tunneling effects, are not only promising for advanced photonic applications but also provide the intrinsic advantage of nanoscale dimensions, which is critical for integrated miniaturized devices. In this work, we propose a scheme to realize a high-intensity two-dimensional asymmetric electromagnetically induced diffraction grating in a QDMs system by incorporating spontaneously generated coherence (SGC) and dual tunneling channels. Our theoretical analysis shows that the presence of SGC markedly enhances the intensity and efficiency of higher-order diffractions. Furthermore, by adjusting the orbital angular momentum and beam waist of vortex beams, we not only amplify the disparity in asymmetric diffraction and enhance the efficiency of the third-order diffraction peak, but also enable a lossless spatial interchange between the diffraction peak positions and those at symmetric positions solely by reversing the orbital angular momentum direction. Additionally, tuning the interdot tunneling strength increases the maximum third-order diffraction intensity by three orders of magnitude, reaching an intensity that is more than ten times higher than the third-order diffraction intensity observed at symmetric positions. These results, which fully leverage the nanoscale advantage and tunable characteristics of QDMs, offer a solid foundation for the implementation of compact photonic devices and pave the way for potential applications in optical diffractive neural networks and electromagnetically induced quantum holography.

DOI: 10.1103/c662-qdr7

Source: https://journals.aps.org/pra/abstract/10.1103/c662-qdr7