【摘 要】
:
Metasurfaces and structured light have rapidly advanced over the past few years, from being paradigms to forming functional devices and tailoring special light beams for wide emerging applications. Here, we focus on harnessing metasurfaces for structured
【机 构】
:
WuhanNationalLaboratoryforOptoelectronics,SchoolofOpticalandElectronicInformation,HuazhongUniversity
【出 处】
:
ChineseOpticsLetters
论文部分内容阅读
Metasurfaces and structured light have rapidly advanced over the past few years, from being paradigms to forming functional devices and tailoring special light beams for wide emerging applications. Here, we focus on harnessing metasurfaces for structured light manipulation. We review recent advances in shaping structured light by metasurfaces on different platforms (metal, silica, silicon, and fiber). Structured light manipulation based on plasmonic metasurfaces, reflection-enhanced plasmonic metasurfaces, metasurfaces on fiber facets, dielectric metasurfaces, and sub-wavelength structures on silicon are presented, showing impressive performance. Future trends, challenges, perspectives, and opportunities are also discussed.
其他文献
This paper presents the fabrication, characterization and numerical simulation of poly-3-hexylthiophene (P3HT)-based bottom-gate bottom-contact (BGBC) organic thin film transistors (OTFTs). The simulation is based on a drift diffusion charge transport mod
以聚酰亚胺薄膜为靶子,用高电导硅作为衬底,KrF准分子激光器作为辐射光源,利用脉冲激光沉积技术制备出了类石墨薄膜,并以该薄膜为阴极对其进行了场致电子发射特性测试。当阴阳极之间产生放电即发生电形成过程之后,该薄膜的阈值电场从最初的16.9V/μm降到10.8V/μm。当电场为20V/μm时,薄膜场发射的电流密度达到了0.4mA/cm2,发射点密度达到10~3/cm2利用XPS,Raman光谱及扫描电子显微镜对该薄膜的微结构进行了测试分析。
齿侧间隙会影响齿轮传动式望远镜的指向和跟踪精度。采用多电机驱动,通过施加偏置力矩能消除齿隙影响。以双电机驱动为例,建立动力学的数学模型,考虑齿隙非线性,齿轮传动链刚度的周期时变性,随机风扰力矩以及电机齿槽力矩的作用,以最小化偏置力矩为目标函数,齿轮不脱离啮合为约束条件,进行优化设计,获得了各驱动力矩下,全速度范围内的最优偏置力矩,并分析了传动系统的转动惯量、刚度及阻尼等参数,对偏置力矩设计的影响,得到了偏置力矩的变化规律。
离散余弦变换(DCT)应用于图像压缩与编码具有实现简单、压缩效率高等优点,但是无法与快速、高效的嵌入式零块编码算法相结合。提出一种新的基于嵌入式零块编码的离散余弦变换系数分布模型,通过系数聚类使离散余弦变换后的图像系数能够具有小波变换后图像系数的分布特点。在编码过程中,对嵌入式零块编码中的四叉树分割框架进行了优化。实验结果表明,新算法不仅降低了嵌入式零块编码的编码复杂度,而且在相同输出码率条件下,峰值信噪比(SNR)高于联合图像专家组(JPEG)图像压缩标准。
分析了无透镜傅里叶变换全息图数字再现时零级衍射斑对再现像的影响,提出了用全息数字相减及数字重现来消除零级斑实现无零级数字全息再现的方法,给出了计算机模拟实验结果,并对再现结果作了分析。
对微纳光纤耦合器(OMC)光吸收致热引起的全光强度调控特性进行了理论分析和实验研究。理论分析结果显示,OMC全光强度调控器件的调制响应效率与OMC腰区长度、抽运光在OMC腰区的损耗系数及抽运调制光强成正比,而与OMC腰区耦合光纤的半径成反比。通过实验将强度调制的980 nm抽运光注入OMC以加热其腰区,实现了对OMC传输的1550 nm工作光的全光调控功能。在百微瓦量级的调控光功率作用下,OMC全光强度调控器件即可实现整周期、大调制深度的强度调制,且在较小调制光功率下,调制响应信号幅度与调制信号幅度呈线性
A hyperspectral imaging system is developed to detect dichlorvos residue on the surface of navel orange. After acquiring hyperspectral images of 400 navel oranges, the actual content of dichlorvos residue is measured by gas chromatography. Optimal wavelen
五月三十一日,在亚特兰大举行的国际量子电子学会议上,国内二个主要的同位素分离实验室的报告使UK中激光引发的化学研究作为一个专门性的课题显露头角。