Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

Quantum Fluctuation Properties of Polariton System in Thermal Vacuum State Field

Using the theory of thermal field dynamics (TFD), a model polariton system is investigated and the squeezing properties of the polariton system at finite temperature is discussed. It is shown that when the photon field is initially in a thermal vacuum state and the phonon initially in its lowest energy level state (the vacuum state), the phonon, photon and also the polariton system can exhibit nonclassical behaviour.     

电磁波在铁电材料中的传输理论

本文从波动方程出发,系统地阐明了铁电材料中,电磁波与各种模式的耦合,包括下面三个方面:纵向光学模式与弹性波的耦合;电磁耦子与纵向弹性波的耦合以及表面耦子和B-G波的耦合,给出了每种情况下的耦合波的色散特征和基本模式。     

Recent Progress of Strong Exciton–Photon Coupling in Lead Halide Perovskites

The semiconductor exciton–polariton, arising from the strong coupling between excitons and confined cavity photon modes, is not only of fundamental importance in macroscopic quantum effects but also has wide application prospects in ultralow‐threshold polariton lasers, slowing‐light devices, and quantum light sources. Very recently, metallic halide perovskites have been considered as a great candidate for exciton–polariton devices owing to their low‐cost fabrication, large exciton oscillator strength, and binding energy. Herein, the latest progress in exciton–polaritons and polariton lasers of perovskites are reviewed. Polaritons in planar and nanowires Fabry–Pérot microcavities are discussed with particular reference to material and photophysics. Finally, a perspective on the remaining challenges in perovskite polaritons research is given.     

基于金属/介质/金属光栅的窄带红外发射/吸收结构设计

设计了一种用于窄带红外发射光源和窄带探测器的金属/介质/金属光栅的红外发射/吸收结构.采用有限差分时域(FDTD)方法,模拟了一维Ag/Si3N4/Ag光栅的反射谱.模拟结果表明,此结构对于TE模和TM模都支持很窄的中红外发射/吸收锋,在很宽的角度范围内发射/吸收中心波长处的发射率可以达到98%以上.此结构的独特发射/...     

（英）基于中红外波段的等离子体金属孔天线

研究了周期性金属孔阵列的光学和远场辐射特性,实验发现所有样品在中红外波段都有两个透射峰,当金属孔径或者孔阵的晶格常数变大时,透过峰的中心频率发生红移.在透过率的中心频率附近,周期性的金属孔阵列表现出偶极子阵列的特性,其远场辐射特性随着孔径的减小或者孔阵列晶格常数的增大而增强.     

超薄金属膜V-型槽等离子波导的定向耦合研究

分析了在 1 550 nm 波长下超薄金属膜(金膜厚t=10 nm)V-型槽等离子波导间长程沟道等离激元导模的定向耦合。通过计算不同波导间距下的模式分布,得出了定向耦合器中奇、偶模有效折射率实部和传播长度随波导间距的变化情况,并进一步计算了相邻波导间的耦合长度、最大串扰与波导间距的关系曲线。计算结果表明:在波导间距较小时,耦合长度小于各模式的传播长度,随着波导间距的增加,耦合长度随之增加,最大串扰随之减小。对超薄金属膜V-型槽等离子波导的定向耦研究在集成光路的实际应用中具有重要的价值。     

腔磁子-极化激元系统的研究进展

光电子芯片在人工智能时代的复杂信息转换中扮演着重要角色。通过强耦合的电子-光子态可以实现光电转换的最高效率。利用电子自旋的自由度具有独特的优势。自旋的集体激发可以形成磁子,它具有长寿命和对焦耳热免疫的特性。这些特性可以通过磁子和高速光子之间的强耦合结合起来,形成"腔-磁子极化激元（CMP）"。最近的进展集中在构建高协同性的CMP,控制CMP的辐射和传输,理解CMP的完美吸收机制,以及开发片上CMP原型器件的电调谐维度和逻辑操作功能。这些围绕CMP相干耦合动力学的研究有望推动低损耗光电器件和前沿信息处理技术的发展。