Author Affiliations
Abstract
The editor-in-chief of Photonics Research announces the journal’s 10-year anniversary, which takes place in 2023 and reports on new initiatives for the journal.
Photonics Research
2023, 11(5): ED1
基于人工智能目标识别，设计了一款分辨率高、视场角宽的近距离车载前视天塞型镜头。利用ZEMAX软件，通过控制场曲、畸变等几何像差进行参数优化设计，当设计的镜头像方空间数为3.4，焦距为6 mm，最大视场角为50°，景深为10 m时，得到空间频率107 lp/mm处的全视场调制传递函数均高于0.65，畸变小于0.305%，满足设计要求。最后对镜头的各项公差进行蒙特卡罗分析，结果表明，公差均在可加工范围内，适合常规生产加工和装配。
光学设计 车载镜头 调制传递函数 景深 公差分析 激光与光电子学进展
2022, 59(17): 1722001
Author Affiliations
Abstract
Department of Electrical and Systems Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, USA
Professor Marlan Scully discusses his career in quantum optics with the Editor-in-Chief of Photonics Research, Prof. Lan Yang.
Photonics Research
2022, 10(1): 01000256
Author Affiliations
Abstract
1 Department of Automation, Tsinghua University, Beijing 100084, China
2 Beijing Academy of Quantum Information Sciences, Beijing 100193, China
3 Department of Electrical and Systems Engineering, Washington University, St. Louis, Missouri 63130, USA
4 Institute of Microelectronics, Tsinghua University, Beijing 100084, China
5 Center for Quantum Information Science and Technology, BNRist, Beijing 100084, China
6 e-mail: yuxiliu@mail.tsinghua.edu.cn
7 e-mail: jing-zhang@mail.tsinghua.edu.cn
Synchronization has great impacts in various fields such as self-clocking, communication, and neural networks. Here, we present a mechanism of synchronization for two mechanical modes in two coupled optomechanical resonators with a parity-time ()-symmetric structure. It is shown that the degree of synchronization between the two far-off-resonant mechanical modes can be increased by decreasing the coupling strength between the two optomechanical resonators due to the large amplification of optomechanical interaction near the exceptional point. Additionally, when we consider the stochastic noises in the optomechanical resonators by working near the exceptional point, we find that more noises can enhance the degree of synchronization of the system under a particular parameter regime. Our results open up a new dimension of research for -symmetric systems and synchronization.
Photonics Research
2021, 9(11): 11002152
为了提高光子晶体光纤的非线性系数，降低色散斜率和制作难度，提出了一种硅纳米纤芯光子晶体光纤，其纤芯和包层空气孔都为圆形。利用平面波展开法进行仿真，研究了硅纳米纤芯直径、包层空气孔直径、晶格常数三个参量分别对色散和非线性系数的影响。通过优化，最终得到零色散波长在1550 nm处，具有高非线性、低色散斜率的光子晶体光纤。1550 nm处光纤的色散斜率低至0.251 ps·nm-2·km-1，非线性系数高达1.0×105 W-1·km-1，限制损耗为0.39 dB/km。此外，该光纤结构简单、制作方便，在较小的工艺误差下仍能保持较好的性能。
光纤光学 光子晶体光纤 非线性 色散 色散斜率 硅纳米晶 激光与光电子学进展
2021, 58(5): 0506004
1 商洛学院 化学工程与现代材料学院, 陕西 商洛 726000
2 南昌大学 材料科学与工程学院, 江西 南昌 330031
3 南昌大学 国家硅基LED工程技术研究中心, 江西 南昌 330047
4 安徽工业大学 数理科学与工程学院, 安徽 马鞍山 243032
利用MOCVD在Al2O3(0001)衬底上制备InGaN/GaN MQW结构蓝光LED外延片。以400 mW中心波长405 nm半导体激光器作为激发光源, 采用自主搭建的100～330 K低温PL谱测量装置, 以及350～610 K高温PL测量装置, 测量不同温度下PL谱。通过Gaussian分峰拟合研究了InGaN/GaN MQW主发光峰、声子伴线峰、n-GaN黄带峰峰值能量、相对强度、FWHM在100～610 K范围的温度依赖性。研究结果表明：在100～330 K温度范围内, 外延片主发光峰及其声子伴线峰值能量与FWHM温度依赖性, 分别呈现S与W形变化; 载流子的完全热化分布温度约为150 K, 局域载流子从非热化到热化分布的转变温度为170～190 K; 350～610 K高温范围内, InGaN/GaN MQW主发光峰峰值能量随温度变化满足Varshni经验公式, 可在MOCVD外延生长掺In过程中, 通过特意降温在线测PL谱, 实时推算掺In量, 在线监测外延片生长。以上结果可为外延片的PL发光机理研究、高温在线PL谱测量设备开发、掺In量的实时监测等提供参考。
多量子阱 发光二极管 外延 光致发光 GaN GaN MQW LED epitaxial photoluminesecence
Author Affiliations
Abstract
1 Department of Electrical and Systems Engineering, Washington University, St. Louis, Missouri 63130, USA
2 Department of Automation, Tsinghua University, Beijing 100084, China
3 Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA
We present a study of single nanoparticle detection using parity-time (PT) symmetric whispering-gallery mode (WGM) resonators. Our theoretical model and numerical simulations show that, with balanced gain and loss, the PT-symmetric WGM nanoparticle sensor, tailored to operate at PT phase transition points (also called exceptional points), exhibits significant enhancement in frequency splitting when compared with a single WGM nanoparticle sensor subject to the same perturbation. The presence of gain in the PT-symmetric system leads to narrower linewidth, which helps to resolve smaller changes in frequency splitting and improve the detection limit of nanoparticle sensing. Furthermore, we also provide a general method for detecting multiple nanoparticles entering the mode volume of a PT-symmetric WGM sensor one by one. Our study shows the feasibility of PT-symmetric WGM resonators for ultrasensitive single nanoparticle and biomolecule sensing.
Sensors Coupled resonators Resonators Photonics Research
2018, 6(5): 05000A23
Author Affiliations
Abstract
1 Department of Electrical and Systems Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, USA
2 Department of Electrical Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA
Conventionally, metallic nanostructures are used for surface-enhanced Raman spectroscopy (SERS), but recently there has been increasing interest in the enhancement of Raman scattering from dielectric substrates due to their improved stability and biocompatibility compared with metallic substrates. Here, we report the observation of enhanced Raman scattering from rhodamine 6G molecules coated on silica microspheres. We excite the whispering gallery modes (WGMs) supported in the microspheres with a tapered fiber coupler for efficient WGM excitation, and the Raman enhancement can be attributed to the WGM mechanism. Strong resonance enhancement in pump laser intensity and modified Raman emission from the Purcell effect in the microsphere resonator are observed from the experiment and compared with theoretical results. A total Raman enhancement factor of 1.4×104 is observed, with contribution mostly from the enhancement in pump laser intensity. Our results show that, with an efficient pumping scheme, dielectric microspheres are a viable alternative to metallic SERS substrates.
Spectroscopy, Raman Surface-enhanced Raman scattering Resonators Photonics Research
2018, 6(5): 05000346
1 集美大学理学院, 福建 厦门 361021
2 福州大学物理与信息工程学院, 福建 福州 350002
在单圆孔电极液晶透镜基础上进行结构改进,形成双层非对称新型液晶透镜。结合几何光学和液晶理论,利用Zemax模拟并优化该双层结构液晶透镜参数。由Zemax分析可知,在相同的低驱动电压(2.5Vrms~20Vrms范围),0°、3.5°、5°视场角中,双层结构透镜相比于单层结构透镜,可获得更宽的调焦范围,短焦焦距f从19.6172 mm缩小到9.9059 mm;像差显著减小;该光学调制传递函数(MTF)为0.6时,径向分辨率从12.06 lp/mm提高到21.02 lp/mm,提高近一倍,图像解像力和清晰度显著提高,并且高频部分MTF由0.1增加到0.3。最后,实验验证了20Vrms时,双层结构液晶透镜的衍射光斑最小。
光学设计 3D显示 液晶透镜 连续变焦
1 集美大学 理学院, 福建 厦门 361021
2 福州大学 物理与信息工程学院, 福建 福州 350116
液晶透镜是自由3D显示的新器件, 其原理是利用基于向列相液晶指向矢随外加电场作用发生变化的光电特性。本文提出一种简易准确的透镜参数设计和优化方案。以单圆孔结构的液晶透镜为例, 利用光学软件ZEMAX和焦距缩放法对圆孔结构的液晶透镜的参数加以设计并优化。分析液晶透镜的像差, 评价成像质量。结果表明, 优化后的液晶透镜的像差明显减小, 3.5°视场下, 弥散斑均方根半径RMS值由248.118 μm减小到62.192 μm, 为原来的25.1%; 光学调制传递函数MTF值明显改善。最后实验测试验证了液晶透镜阵列的衍射光斑亮度及清晰度均显著提高。
液晶透镜 调制传递函数(MTF) 光学设计 像质评价 liquidcrystal lens modulation transfer function(MTF) optical design image evaluation
