Yang Luo 1†Hongyi Huang 1†Lei Wan 1,2,5,*Weiping Liu 1Zhaohui Li 3,4,6,*
Author Affiliations
1 Department of Electronic Engineering, College of Information Science and Technology, Jinan Universityhttps://ror.org/02xe5ns62, Guangzhou 510632, China
2 International Institute for Innovative Design and Intelligent Manufacturing, Tianjin University, Shaoxing 312000, China
3 Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems, Sun Yat-sen University, Guangzhou 510275, China
4 Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China
5 e-mail: wanlei@jnu.edu.cn
6 e-mail: lzhh88@sysu.edu.cn
Integrated optomechanical crystal (OMC) cavities provide a vital device prototype for highly efficient microwave to optical conversion in quantum information processing. In this work, we propose a novel heterogeneous OMC cavity consisting of a thin-film lithium niobate (TFLN) slab and chalcogenide (ChG) photonic crystal nanobeam coupled by a wavelength-scale mechanical waveguide. The optomechanical coupling rate of the heterogeneous OMC cavity is optimized up to 340 kHz at 1.1197 GHz. Combined with phononic band and power decomposition, 17.38% energy from the loaded RF power is converted into dominant fundamental horizontal shear mode (SH0) in the narrow LN mechanical waveguide. Based on this fraction, as a result, 3.51% power relative to the loaded RF energy is scattered into the fundamental longitudinal mode (L0) facing the TFLN-ChG heterogeneous waveguide. The acoustic breathing mode of the heterogeneous OMC is successfully excited under the driving of the propagating L0 mode in the heterogeneous waveguide, demonstrating the great potentials of the heterogeneous piezo-optomechanical transducer in high-performance photon–phonon interaction fields.
Photonics Research
2023, 11(9): 1509
Author Affiliations
1 State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, College of Electronic Science and Engineering, Changchun 130012, China
2 State Key Laboratory of Superhard Materials, College of Physics, Jilin University, College of Physics, Changchun 130012, China
3 State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Haidian, Department of Precision Instrument, Beijing 100084, China
Strong light-matter interactions in two-dimensional transition metal dichalcogenides (TMDCs) with robust spin-valley degrees of freedom open up the prospect of valleytronic devices. A thorough understanding on the dynamics of the valley polarizations in the strong coupling regime is urgently required. Here, multiple polarized TMDCs-SPPs hybrid systems were constructed by combining monolayer WS2 flakes to linear, circular, and spiral Ag gratings, resulting in linear and circular polarized modulation on the coherent hybrid states, respectively. Particularly, valley polaritons can be tailored asymmetrically by chiral strong coupling regime. Furthermore, the dynamics of the polarized polaritons were directly analyzed by transient absorption (TA) measurement. Both of the linear and circular polarization difference in the TA spectra can be retained for a remarkable long time, leading to a polarized PL even at room temperature. More importantly, in the chiral strong coupled WS2-spiral Ag grating devices, the mechanism of the asymmetrical valley-polarized PL (p σ+ = 14.9% and p σ- = 10.8%) is proved by the opposite valley polarization dynamics in the circularly polarized TA spectra. The multiple polarization modulation in monolayer TMDCs-SPPs strong coupling devices could provide a viable route toward multiple polarization polaritonic devices.
2022, 3(1): 5
1 上海师范大学 信息与机电工程学院,上海 200234
2 清华大学 材料学院,北京 100084
3 无锡市好达电子股份有限公司,江苏 无锡 214124
声表面波(SAW)器件 非线性 测量系统 谐波信号 产生机制 surface acoustic wave (SAW) device nonlinearity measurement system harmonic signals generation mechanism 
2022, 44(5): 682
闫磊 1,2,*石峰 1,2单聪 3程宏昌 1,2[ ... ]张晓辉 1,2
1 微光夜视技术重点实验室,陕西西安 710065
2 昆明物理研究所,云南昆明 650223
3 陆军装备部驻西安地区军代局驻西安地区第八军事代表室,陕西西安 710065
极限分辨力 铝镓氮光阴极 像增强器 limiting resolution, AlGaN photocathode, image int 
2020, 42(8): 729
Author Affiliations
1 School of Physics, State Key Laboratory for Mesoscopic Physics, Academy for Advanced Interdisciplinary Studies, and Nano-optoelectronics Frontier Center of Ministry of Education, Peking University, Beijing 100871, China
2 Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
3 Department of Materials Science and NanoEngineering, Rice University, 6100 Main Street, Houston, TX 77005, USA
4 Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
Manipulation of light-matter interaction is critical in modern physics, especially in the strong coupling regime, where the generated half-light, half-matter bosonic quasiparticles as polaritons are important for fundamental quantum science and applications of optoelectronics and nonlinear optics. Two-dimensional transition metal dichalcogenides (TMDs) are ideal platforms to investigate the strong coupling because of their huge exciton binding energy and large absorption coefficients. Further studies on strong exciton-plasmon coupling by combining TMDs with metallic nanostructures have generated broad interests in recent years. However, because of the huge plasmon radiative damping, the observation of strong coupling is significantly limited at room temperature. Here, we demonstrate that a large Rabi splitting (~300 meV) can be achieved at ambient conditions in the strong coupling regime by embedding Ag-WS2 heterostructure in an optical microcavity. The generated quasiparticle with part-plasmon, part-exciton and part-light is analyzed with Hopfield coefficients that are calculated by using three-coupled oscillator model. The resulted plasmon-exciton polaritonic hybrid states can efficiently enlarge the obtained Rabi splitting, which paves the way for the practical applications of polaritonic devices based on ultrathin materials.
Rabi splitting strong coupling transition metal dichalcogenides optical microcavity surface plasmons 
Opto-Electronic Advances
2019, 2(5): 190008
西南民族大学 化学与环境保护工程学院, 四川 成都 610041
在反应温度为200 ℃、反应时间为8 h的温和条件下, 采用水热法合成了近红外到近红外的Mn2+掺杂NaYF4 ∶Yb3+/Tm3+上转换荧光纳米粒子, 再以两亲性聚合物C18PMH-mPEG作为亲水性配体修饰到上转换荧光纳米粒子表面, 得到具有水溶性的上转换荧光纳米粒子。然后在980 nm近红外光源激发下, 测量了上转换荧光纳米粒子的荧光发射光谱, 在(800±10) nm附近, 观察到了较强的单近红外光发射(3H4 →3H6)。对样品进行细胞毒性实验, 结果表明制得的水溶性Mn2+掺杂NaYF4 ∶Yb3+/Tm3+纳米粒子具有良好的生物相容性。并进一步在小鼠体内进行了近红外成像, 表明其在生物成像领域将会具有一定的应用前景。
水热法 上转换 纳米粒子 生物成像 hydrothermal Yb3+/Tm3+ Yb3+/Tm3+ upconversion nanoparticles bioimaging 
2018, 39(10): 1371
1 Institute of Electronics, Chinese Academy of Science, Beijing 100190, China
2 Computer and Information Engineering, Beijing Technology and Business University, Beijing 100048, China
Field Programmable Gate Array Fast Fourier Transform multi-channel parallelmode variable-length reconfigurable architecture 
2017, 15(3): 469
1 中国科学院 上海光学精密机械研究所 中国科学院强激光材料重点实验室,上海 201800
2 中国科学院大学,北京 100049
针对晶体表面的损伤特性,采用小光斑扫描激光预处理技术预辐照DKDP晶体元件,并采用表面损伤自动探测系统实时分析每个脉冲辐照后晶体表面的损伤情况,比较预处理和未预处理区域的损伤点密度确定表面预处理效果,并进一步模拟分析表面各类缺陷在纳秒强激光辐照下的动态过程,解释激光预处理对精抛表面提升作用的微观机制并分析它对粗抛表面提升不明显的原因。实验结果表明,激光预处理技术对粗抛表面的提升作用并不明显,但是可以大幅度抑制精抛表面的损伤点密度。在本文的实验条件下,晶体表面的抗激光损伤能力可以提升约60%。比较体材料和精抛表面的预处理效果发现: 当体材料的抗破坏能力通过预处理提升后,精抛表面的抗激光损伤能力也会提升,由此可见精抛表面的激光预处理效果与体材料性能相关。
激光损伤 激光预处理 损伤阈值 预处理效果 氘化磷酸二氢钾(DKDP) laser damage laser conditioning damage threshold laser conditioning effects dopted deuterium KDP (DKDP) 
光学 精密工程
2017, 25(8): 1987
1 江西理工大学 冶金与化学工程学院, 江西 赣州 341000
2 国家离子型稀土资源高效开发利用工程技术研究中心, 江西 赣州 341000
采用高温固相法制备了LiGd(WyMo1-y)2O8-x/2Fx∶0.4Eu3+ (x=0~1,y=0~1)系列白光LED用红色荧光粉。通过扫描电子显微镜、X射线衍射仪、红外光谱仪、荧光光谱仪对荧光粉的形貌、结构、光学性能进行了表征。结果表明, Eu3+、F-和WO2-4的掺杂没有改变LiGd(MoO4)2的四方晶系白钨矿结构; F-和WO2-4最佳掺杂量分别为x=0.6, y=0.4。在396 nm激发下, LiGd(W0.4Mo0.6)2O7.7F0.6∶0.4Eu3+的发光强度比未掺杂样品提高了60%, 量子效率可达66.23 %。当温度升高至100 ℃时, 样品的发射强度降为25 ℃时的76.6%。在460 nm激发下, 样品的最强窄带发射峰位于617 nm处, 归属于5D0→7F2跃迁, 色坐标为(0.649 9, 0.346 3)。5D0能级的荧光寿命曲线遵循单指数规律衰减, 随着F-掺杂浓度的增加, 5D0能级的荧光寿命不断增加, 归因于低声子能量的F-掺入有效减小了能量的无辐射跃迁概率。所制备的LiGd(W0.4Mo0.6)2O7.7F0.6∶0.4Eu3+荧光粉有望应用于白光LED。
发光 红色荧光粉 白光LED 高温固相法 luminescence red phosphor white LEDs solid state reaction 
2016, 37(10): 1203
1 中国科学院大学, 北京 100049
2 中国科学院长春光学精密机械与物理研究所, 吉林 长春 130033
传递辐射计是实现卫星遥感仪器在轨光谱辐射定标传递的核心设备, 也是地面实验室高精度光谱定标系统的关键。 介绍了不同机构研制的覆盖350~700, 700~2 500 nm谱段的多个传递辐射计的结构组成、 工作原理及辐射定标基准传递方式, 及其异同点的比对, 再通过它们在不同谱段的定标过程中所应用的关键技术的分析, 说明每种技术的优缺点和所能达到的精度, 及其应用条件。 文中通过对国际上标准计量机构采用的光谱辐亮度基准定标传递过程的介绍, 突出了传递辐射计系统的重要作用, 再结合其对光谱仪等遥感器定标光源的定标监测应用, 说明了传递辐射计在航天辐射定标领域的不可或缺性。 最后, 通过国内设计的新型传递辐射计的介绍, 对传递辐射计未来研究的发展方向和关键问题进行了展望, 并对传递辐射计搭配低温辐射计组成的未来实现可溯源国际单位制在轨基准定标传递系统所存在的研究难点予以预测分析。
传递辐射计 光谱辐射基准传递链 光源定标监测 可溯源SI在轨定标 Transfer radiometer Traceability chain for spectral radiance standard Monitoring calibration of source SI-traceability calibration on-orbit 
2016, 36(9): 2984

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