Author Affiliations
Abstract
1 Nanjing University, Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid-State Microstructures, Nanjing, China
2 Nanjing University, School of Electronic Sciences and Engineering, Nanjing, China
3 Nanjing University, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, Nanjing, China
Metasurface-based imaging has attracted considerable attention owing to its compactness, multifunctionality, and subwavelength coding capability. With the integration of computational imaging techniques, researchers have actively explored the extended capabilities of metasurfaces, enabling a wide range of imaging methods. We present an overview of the recent progress in metasurface-based imaging techniques, focusing on the perspective of computational imaging. Specifically, we categorize and review existing metasurface-based imaging into three main groups, including (i) conventional metasurface design employing canonical methods, (ii) computation introduced independently in either the imaging process or postprocessing, and (iii) an end-to-end computation-optimized imaging system based upon metasurfaces. We highlight the advantages and challenges associated with each computational metasurface-based imaging technique and discuss the potential and future prospects of the computational boosted metaimager.
metasurface computational imaging inverse problem algorithm Advanced Photonics
2024, 6(1): 014002
红外与激光工程
2022, 51(6): 20220237
国防科技大学 前沿交叉学科学院,湖南 长沙 410073
红外与激光工程
2022, 51(4): 20211103
Author Affiliations
Abstract
1 College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
2 State Key Laboratory of Pulsed Power Laser Technology, Changsha 410073, China
3 Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, China
We demonstrate an all-fiber high-power linearly polarized supercontinuum source with polarization-maintaining photonic crystal fibers (PM-PCFs) as the nonlinear medium. The source exhibits an average output power of 3.8 W with a flat spectrum from 480 nm to 2100 nm at the $-$10 dB level, except for the residual pump peak. The polarization extinction ratio (PER) is measured to be greater than 20 dB at selected sample wavelength points (532 nm, 1064 nm and 1550 nm) at the highest pump power level and greater than 20 dB at all wavelengths from 800 nm to 1500 nm at the low pump power level. We also experimentally study the spectral properties when the pump light propagates along different axes of the PM-PCF. The results show that propagating parallel to the slow axis enables a broader spectrum in the PM-PCF in this case, probably due to matching of the dispersion properties with the pump light, which is qualitatively in accordance with the numerical simulation. To our best knowledge, this is the first demonstration of a watt-level linearly polarized supercontinuum source generated from PM-PCFs in an all-fiber structure.
linear polarization photonic crystal fiber polarization maintaining supercontinuum High Power Laser Science and Engineering
2019, 7(2): 02000e28
Author Affiliations
Abstract
1 Hunan Key Laboratory for Micro-Nano Energy Materials and Devices, School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, China
2 Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
3 SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
We have prepared the graphene/MoS2 heterostructure by a hydrothermal method, and presented its nonlinear absorption parameters and application as a nonlinear optical modulator in the mid-infrared region. Using the nonlinear optical modulator, stable passively Q-switched operation of an Er3+-doped ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAN) fiber laser at ~2.8 μm can be obtained. The Q-switched Er3+-doped ZBLAN fiber laser can yield per-pulse energy up to 2.2 μJ with the corresponding pulse width and pulse repetition rate of 1.9 μs and 45 kHz, respectively. Our results indicate that the graphene/MoS2 heterostructure can be a robust optical modulator for pulsed lasers in the mid-infrared spectral range.
160.4330 Nonlinear optical materials 140.3070 Infrared and far-infrared lasers Chinese Optics Letters
2018, 16(2): 020012
1 江南大学 理学院 光电信息科学与工程系, 无锡 214122
2 江苏省轻工光电工程技术研究中心, 无锡 214122
为了更快速、简便、准确地同时测定多种抗生素混合物, 采用同步荧光光谱结合径向基神经网络的方法, 对3种氟喹诺酮类抗生素(乳酸环丙沙星、乳酸左氧氟沙星、盐酸左氧氟沙星)的同步荧光光谱进行研究。选择3组分浓度均为1.67ng/mL的混合溶液, 测量其3维同步荧光光谱; 分别测量39种不同浓度的混合溶液样本的同步荧光光谱; 选取其中35种作为训练组, 其余4种作为预测组, 将训练组样本对应的光谱数据作为输入, 建立和训练径向基神经网络; 在发射波长与激发波长的差Δλ=194nm条件下, 利用训练好的神经网络对预测组中各组分的浓度进行预测, 得到3种组分浓度预测的平均相对误差分别达到3.59%,3.47%,3.09%。结果表明, 当Δλ设定为194nm时, 3种抗生素的同步荧光峰差异最为明显、区分度高, 该方法能实现对3种抗生素混合物中各组分的同时测定。这为多种抗生素混合物同时测定提供了一种快速、简便、准确的方法。
光谱学 同时测定 同步荧光光谱 径向基神经网络 氟喹诺酮类抗生素 spectroscopy simultaneous determination synchronous fluorescence spectra radial basis function neural network fluoroquinolone antibiotics