为提高太赫兹光电导天线输出效率，提出了一种基于层级人工等离激元结构的光电导天线的设计方法。层级人工等离激元结构由纳米尺度金属块阵列和微米尺度周期栅格结合而成，理论与仿真结果表明，前者通过人工局域表面等离激元谐振效应可提高光子-电子转换效率，后者则利用人工表面等离激元结构基模的禁带和高阶模式与电流源模式之间的正交性增强了光电导天线的垂直方向性。集成了层级人工等离激元结构的光电导天线结合了两种结构的优点，数值计算结果表明，其输出效率优于分别采用两种结构的方案。相较于未改进的光电导天线，层级人工等离激元结构在较宽频带范围内（0.86~1.51 THz）实现了光电导天线垂直方向辐射功率密度的提高。

光子集成芯片将多种功能器件进行片上集成，具有损耗低、带宽大、抗电磁干扰等优势，是当前光电领域发展的主流方向。集成光学器件的温度稳定性是影响其光学性能的重要因素之一。为了提高集成光学器件温度稳定性，提出了基于氮化硅（Si₃N₄）和长程表面等离激元（Long-Range Surface Plasmon Polariton，LRSPP）波导的温度不敏感结构，对器件性能随温度的漂移进行抑制和补偿。首先，分析了Si₃N₄波导和LRSPP波导对接的模式耦合效率，当满足最佳匹配条件时，可实现耦合效率99.9%以上的高效耦合。对混合波导的温度特性进行了分析，结果表明，当LRSPP波导和Si₃N₄波导的最佳长度比为 0.077，相位不随温度的变化而发生漂移，实现了温度不敏感的波导。当波导不能满足最佳长度比时，对LRSPP波导芯层施加电压实现主动补偿，亦可实现温度不敏感。此外，对LRSPP波导的传输特性进行了测试，测得偏振消光比为64 dB，具有良好的单偏振特性。文中提出的温度不敏感结构具有可主动调谐、损耗低、单偏振、普适性高等优点，能有效地解决Si₃N₄波导性能随温度变化发生漂移的问题，在Si₃N₄基光子集成芯片中具有广泛的应用前景。

为灵活控制波束以增强多目标探测和跟踪功能，研制了基于人工表面等离子体激元（SSPP）的毫米波四波束高扫描率漏波天线（LWA）。根据正弦电抗调制叠加理论，对基片集成波导（SIW）槽缝形成的SSPP结构进行多周期性叠加调控，实现四波束扫描LWA。为改善天线的法向辐射性能，在SIW下表面周期性开槽，消除LWA的阻带效应。对设计的LWA进行加工和测试，结果表明在29 GHz~30.2 GHz的频带内，该天线的四个波束能从-52°连续扫描到+22°，扫描率达到18°/%BW，节约了频谱资源，并提高了多目标探测效率。

纳米激光器在光通信、全息技术、生物医疗成像等领域有着广泛的应用前景。表面等离激元（Surface plasmon polariton， SPP）沿着金属表面传播，基于该特性可制成突破衍射极限的低阈值纳米激光器。它们不但具有小尺寸特征，同时还能激发Purcell效应，表现出更高的自发辐射效率。近年来，金属‐绝缘体‐半导体（MIS）波导结构的SPP激光器因具有超强的模式约束能力被大量报道。本文以基于MIS结构的SPP激光器为主题进行综述。首先，介绍了SPP激光器的工作原理，接着分别介绍了基于MIS波导结构的纳米片型和纳米线型SPP激光器的工作原理。然后，依据增益介质材料的不同，依次介绍了增益介质分别为Ⅱ‐Ⅵ半导体、Ⅲ‐Ⅴ半导体以及钙钛矿的SPP MIS波导激光器研究进展。最后，总结全文，并对基于MIS波导的SPP激光器未来的发展和挑战进行了展望。

On-chip manipulation of the spatiotemporal characteristics of optical signals is important in the transmission and processing of information. However, the simultaneous modulation of on-chip optical pulses, both spatially at the nano-scale and temporally over ultra-fast intervals, is challenging. Here, we propose a spatiotemporal Fourier transform method for on-chip control of the propagation of femtosecond optical pulses and verify this method employing surface plasmon polariton (SPP) pulses on metal surface. An analytical model is built for the method and proved by numerical simulations. By varying space- and frequency-dependent parameters, we demonstrate that the traditional SPP focal spot may be bent into a ring shape, and that the direction of propagation of a curved SPP-Airy beam may be reversed at certain moments to create an S-shaped path. Compared with conventional spatial modulation of SPPs, this method offers potentially a variety of extraordinary effects in SPP modulation especially associated with the temporal domain, thereby providing a new platform for on-chip spatiotemporal manipulation of optical pulses with applications including ultrafast on-chip photonic information processing, ultrafast pulse/beam shaping, and optical computing.On-chip manipulation of the spatiotemporal characteristics of optical signals is important in the transmission and processing of information. However, the simultaneous modulation of on-chip optical pulses, both spatially at the nano-scale and temporally over ultra-fast intervals, is challenging. Here, we propose a spatiotemporal Fourier transform method for on-chip control of the propagation of femtosecond optical pulses and verify this method employing surface plasmon polariton (SPP) pulses on metal surface. An analytical model is built for the method and proved by numerical simulations. By varying space- and frequency-dependent parameters, we demonstrate that the traditional SPP focal spot may be bent into a ring shape, and that the direction of propagation of a curved SPP-Airy beam may be reversed at certain moments to create an S-shaped path. Compared with conventional spatial modulation of SPPs, this method offers potentially a variety of extraordinary effects in SPP modulation especially associated with the temporal domain, thereby providing a new platform for on-chip spatiotemporal manipulation of optical pulses with applications including ultrafast on-chip photonic information processing, ultrafast pulse/beam shaping, and optical computing.

Although tremendous efforts have been devoted to investigating planar single-conductor circuits, it remains challenging to provide tight confinement of electromagnetic field and compatibility with active semi-conductor components such as amplifier, harmonic generator and mixers. Single-conductor spoof surface plasmon polariton (SSPP) structure, which is one of the most promising planar single-conductor transmission media due to the outstanding field confinement, still suffers from the difficulty in integrating with the active semi-conductor components. In this paper, a new kind of odd-mode-metachannel (OMM) that can support odd-mode SSPPs is proposed to perform as the fundamental transmission channel of the single-conductor systems. By introducing zigzag decoration, the OMM can strengthen the field confinement and broaden the bandwidth of odd-mode SSPPs simultaneously. More importantly, the active semi-conductor amplifier chip integration is achieved by utilizing the intrinsic potential difference on OMM, which breaks the major obstacle in implementing the single-conductor systems. As an instance, an amplifier is successfully integrated on the single-conductor OMM, which can realize both loss compensation and signal amplification. Meanwhile, the merits of OMM including crosstalk suppression, low radar cross section (RCS), and flexibility are comprehensively demonstrated. Hence, the proposed OMM and its capability to integrate with the active semi-conductor components may provide a new avenue to future single-conductor conformal systems and smart skins.Although tremendous efforts have been devoted to investigating planar single-conductor circuits, it remains challenging to provide tight confinement of electromagnetic field and compatibility with active semi-conductor components such as amplifier, harmonic generator and mixers. Single-conductor spoof surface plasmon polariton (SSPP) structure, which is one of the most promising planar single-conductor transmission media due to the outstanding field confinement, still suffers from the difficulty in integrating with the active semi-conductor components. In this paper, a new kind of odd-mode-metachannel (OMM) that can support odd-mode SSPPs is proposed to perform as the fundamental transmission channel of the single-conductor systems. By introducing zigzag decoration, the OMM can strengthen the field confinement and broaden the bandwidth of odd-mode SSPPs simultaneously. More importantly, the active semi-conductor amplifier chip integration is achieved by utilizing the intrinsic potential difference on OMM, which breaks the major obstacle in implementing the single-conductor systems. As an instance, an amplifier is successfully integrated on the single-conductor OMM, which can realize both loss compensation and signal amplification. Meanwhile, the merits of OMM including crosstalk suppression, low radar cross section (RCS), and flexibility are comprehensively demonstrated. Hence, the proposed OMM and its capability to integrate with the active semi-conductor components may provide a new avenue to future single-conductor conformal systems and smart skins.

量子表面等离激元近年来发展迅速，引起了极大的关注。而银纳米线由于自身的多种优势成为量子表面等离激元的代表性载体之一，是该领域很多工作中的重要元器件。回顾了近年来基于银纳米线的表面等离激元在量子信息领域中的理论和实验研究进展，主要包括表面等离激元自身和在银纳米线上传输的基本性质，银纳米线与量子发光点的相互作用、构建量子集成表面等离激元回路以及在量子精密传感领域的应用。最后提出了利用银纳米线实现量子表面等离激元应用过程中尚存的困难与挑战，以及可能的解决方法与未来研究方向。

提出了一种由二氧化钒（VO₂）和金属Au构成的吸收带宽可调谐的超材料完美吸收器（MPA）。模拟发现，该MPA的吸收波长覆盖了可见光和近红外光。改变VO₂温度，MPA的吸收带宽可实现0.378 μm的调谐。分析MPA在吸收波长处的磁场分布发现MPA激发了表面等离子激元共振，实现在可见光和近红外光完美吸收。本文提出的MPA可应用于智能设备和热发射器等当中。

We report a feasible method to realize tunable surface plasmon-polariton (SPP) resonance in organic light-emitting devices (OLEDs) by employing corrugated Ag-Al alloy electrodes. The excited SPP resonance induced by the periodic corrugations can be precisely tuned based on the composition ratios of the Ag-Al alloy electrodes. With an appropriate composition ratio of the corrugated alloy electrode, the photons trapped in SPP modes are recovered and extracted effectively. The 25% increasement in luminance and 21% enhancement in current efficiency have been achieved by using the corrugated Ag-Al alloy electrodes in OLEDs.