Contents
2020
Volume: 18 Issue 1
22 Article(s)

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Research Articles
Atomic and Molecular Optics
Coulomb potential influence in the attoclock experimental scheme | Editors' Pick
Zhilei Xiao, Wei Quan, Songpo Xu, Shaogang Yu, Yanlan Wang, Meng Zhao, Mingzheng Wei, Yu Zhou, Xuanyang Lai, Jing Chen, and Xiaojun Liu
Coulomb potential may induce a significant angular offset to the two-dimensional photoelectron momentum distributions for atoms subject to strong elliptically polarized laser fields. In the attoclock experiment, this offset usually cannot be easily disentangled from the contribution of tunneling delay and poses a main obstacle to the precise measurement of tunneling delay. Based on semiclassical calculations, here, we propose a method to extract the equivalent temporal offset induced solely by Coulomb potential (TOCP) in an attoclock experiment. Our calculations indicate that, at constant laser intensity, the TOCP shows distinctive wavelength dependence laws for different model atoms, and the ratio of the target atom’s TOCP to that of H becomes insensitive to wavelength and linearly proportional to (2Ip) 3/2, where Ip is the ionization potential of the target atom. This wavelength and Ip dependence of TOCP can be further applied to extract the Coulomb potential influence. Our work paves the way for an accurate measurement of the tunneling delay in the tunneling ionization of atoms subject to intense elliptically polarized laser fields.
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 010201 (2020)
Biomedical Optics
Tikhonov-regularization-based projecting sparsity pursuit method for fluorescence molecular tomography reconstruction
Jiaju Cheng, and Jianwen Luo
For fluorescence molecular tomography (FMT), image quality could be improved by incorporating a sparsity constraint. The L1 norm regularization method has been proven better than the L2 norm, like Tikhonov regularization. However, the Tikhonov method was found capable of achieving a similar quality at a high iteration cost by adopting a zeroing strategy. By studying the reason, a Tikhonov-regularization-based projecting sparsity pursuit method was proposed that reduces the iterations significantly and achieves good image quality. It was proved in phantom experiments through time-domain FMT that the method could obtain higher accuracy and less oversparsity and is more applicable for heterogeneous-target reconstruction, compared with several regularization methods implemented in this Letter.
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 011701 (2020)
Fiber Optics and Optical Communications
Stimulated Brillouin scattering by the interaction between different-order optical and acoustical modes in an As2Se3 photonic crystal fiber
Weiqing Gao, Liang Chen, Wenhui Jiang, Zhengxiong Zhang, Xiu Zhang, Panyun Gao, Kang Xie, Wei Zhang, Yong Zhou, Meisong Liao, Takenobu Suzuki, and Yasutake Ohishi
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 010602 (2020)
Holography
Real-time color holographic video reconstruction using multiple-graphics processing unit cluster acceleration and three spatial light modulators
Shohei Ikawa, Naoki Takada, Hiromitsu Araki, Hiroaki Niwase, Hiromi Sannomiya, Hirotaka Nakayama, Minoru Oikawa, Yuichiro Mori, Takashi Kakue, Tomoyoshi Shimobaba, and Tomoyoshi Ito
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 010901 (2020)
Image Processing and Machine Vision
An effective interference suppression algorithm for visible light communication system based on DBSCAN
Guojun Lu, and Hongzhan Liu
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 011001 (2020)
Lasers and Laser Optics
Three-level all-fiber laser at 915 nm based on polarization-maintaining Nd3+-doped silica fiber
Yafei Wang, Xingyu Li, Jiamin Wu, Xiulin Peng, Jiangkun Cao, Changsheng Yang, Shanhui Xu, Zhongmin Yang, and Mingying Peng
Nd3+-doped fiber lasers at around 900 nm based on the 4F3/2 → 4I9/2 transition have obtained much research attention since they can be used as the laser sources for generating pure blue fiber lasers through the frequency doubling. Here, an all-fiber laser at 915 nm was realized by polarization-maintaining Nd3+-doped silica fiber. A net gain per unit length of up to 1.0 dB/cm at 915 nm was obtained from a 4.5 cm fiber, which to our best knowledge is the highest gain coefficient reported in this kind of silica fiber. The optical-to-optical conversion efficiency varies with the active fiber length and the reflectivity of the output fiber Bragg grating (FBG), presenting an optimal value of 5.3% at 5.1 cm fiber length and 70% reflectivity of the low reflection FBG. Additionally, the linear distributed Bragg reflector short cavity was constructed to explore its potential in realizing single-frequency 915 nm fiber laser. The measurement result of longitudinal-mode properties shows it is still multi-longitudinal mode laser operation with 40 mm laser cavity. These results indicate that the Nd3+-doped silica fiber could be used to realize all-fiber laser at 915 nm, which presents potential to be the seed source of high-power fiber laser.
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 011401 (2020)
Lasing emission of dye-doped cholesteric liquid crystal microdroplet wrapped by polyglycerol in hollow glass microsphere
Chi Zhang, Dongying Fu, Chunli Xia, Lishuang Yao, Chunlian Lu, Weimin Sun, and Yongjun Liu
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 011402 (2020)
Real-time phase measurement and correction of dynamic multimode beam using a single spatial light modulator
Kun Xie, Wenguang Liu, Qiong Zhou, Zongfu Jiang, Fengjie Xi, and Xiaojun Xu
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 011404 (2020)
Nanophotonics
A controllable coupling structure for silicon microring resonators based on adiabatic elimination | On the Cover
Fenghe Yang, Pengfei Sun, Ruixuan Chen, and Zhiping Zhou
Optical microring resonators are extensively employed in a wide range of physical studies and applications due to the resonance enhancement property. Incorporating coupling control of a microring resonator is necessary in many scenarios, but modifications are essentially added to the resonator and impair the capability of optical enhancement. Here, we propose a flexible coupling structure based on adiabatic elimination that allows low-loss active coupling control without any modifications to the resonators. The self-coupling coefficient can be monotonically or non-monotonically controllable by the proposed coupler, potentially at a high speed. The characteristic of the coupler when implemented in silicon microring resonators is investigated in detail using substantiated analytical theory and experiments. This work provides a general method in coupling control while ensuring the resonance enhancement property, making active coupling control in a resonator-waveguide system feasible.
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 013601 (2020)
Nonlinear Optics
Wavelength-dependent nonlinear absorption of gold nanocages
Shuang Chen, Suying Yang, Yan Huang, Weiyan Jiao, Guanghua Fan, and Yachen Gao
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 011901 (2020)
Nonlinear optical switching and all-figures of merit in Bi2S3-xSex/PMMA nanocomposite films investigated by Z scan under visible CW laser
M. Y. Shubar, H. L. Saadon, and Saeed J. Abbas
Bi2S3-xSex/poly(methyl methacrylate) (PMMA) nanocomposite films were prepared using microwave assisted synthesis with different compositions of x. Crystal structure, surface morphology, and optical properties were investigated to characterize the prepared nanocomposite films. The crystallinity and optical band gap of the prepared Bi2S3-xSex/PMMA were affected by x. The prepared samples showed a blue shift in the absorption edge. The laser power dependent nonlinear refraction and absorption of Bi2S3-xSex/PMMA nanocomposite films were investigated by using the Z-scan technique. The optical nonlinearity of the nanocomposite films exhibited switchover from negative nonlinear refraction to positive nonlinear refraction to negative nonlinear refraction effects, and from saturable absorption to reverse saturable absorption to saturable absorption with an increase and decrease in the composition. An interesting all-optical figure of merit was reported to assess the nanocomposite films for a practical device. It was calculated that the device all-figures of merit were based on the nonlinear response, which is important for the all-optical switching device. The results demonstrate that the optimized all-optical figures of merit can be achieved by adjusting the composition and input laser power, which can be used for the design of different all-photonic devices, and the results of nonlinear switching behavior can open new possibilities for using the nanocomposite films in laser Q-switching and mode-locking.
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 011902 (2020)
Optical Design and Fabrication
Experimental generation of Kagome lattices using metasurface of integrated convex lens | Editors' Pick
Zhenhua Li, Chuanfu Cheng, Hanping Liu, Dawei Li, Shicai Xu, Huilan Liu, Junye Zhang, and Suzhen Zhang
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 012201 (2020)
Optical Sensing, Measurements, and Metrology
Blind identification of occurrence of multi-modality in laser-feedback-based self-mixing sensor
Muhammad Usman, Usman Zabit, Olivier D. Bernal, and Gulistan Raja
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 011201 (2020)
Optics in Computing and Optical Data Storage
Optical tape for high capacity three-dimensional optical data storage
Xupeng Yuan, Miao Zhao, Xinjun Guo, Yao Li, Zongsong Gan, and Hao Ruan
In this Letter, a new approach of optical tape for high capacity multilayer data storage is proposed. We show that a length of 5 cm and width of 2 cm of soft and transparent optical tape can be used for two-photon three-dimensional bit data storage. We successfully demonstrate writing and reading of six layers of data storage with a transverse bit separation of 2 μm and an axial separation of 2.5 μm in a tetraphenylethylene-doped photobleaching polymer. The fluorescence intensity is insensitive to the storage depth of the photopolymer matrix. Thus, the optical tape that we put forward in the experiment can help people realize true large data storage in the future, like magnetic tape. This method significantly paves a novel way for solving big data storage problems.
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 012001 (2020)
Optoelectronics
Bias-free operational monolithic symmetric-connected photodiode array
Dan Yang, Yongqing Huang, Tao Liu, Xiaokai Ma, Xiaofeng Duan, Kai Liu, and Xiaomin Ren
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 012501 (2020)
Stability optimization of channel-interleaved photonic analog-to-digital converter by extracting of dual-output photonic demultiplexing
Kangjia Zheng, Weiwen Zou, Lei Yu, Na Qian, and Jianping Chen
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 012502 (2020)
Thin Films and Optics At Surfaces
Controllable annulus micro-/nanostructures on copper fabricated by femtosecond laser with spatial doughnut distribution
Biwei Wu, Cong Wang, Zhi Luo, Junhui Li, Shu Man, Kaiwen Ding, and Ji’an Duan
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 013101 (2020)
A reconfigurable terahertz polarization converter based on metal–graphene hybrid metasurface
Junxiang Huang, Tao Fu, Haiou Li, Zhaoyu Shou, and Xi Gao
A metal–graphene hybrid metasurface polarization converter is designed in this Letter. The unit cell of the hybrid metasurface is composed of a butterfly-shaped structure whose branches are connected by multi-layer graphene sheets. The proposed device can be reconfigured from linear-to-circular polarization to cross-polarization by changing the Fermi energy of graphene. The simulation results show that for three-layer graphene, the device acts as a linear-to-circular polarization converter when EF = 0 eV and switches to a cross-polarization converter when EF = 0.5 eV. Compared with single-layer graphene, the device with three-layer graphene can maintain the cross-polarization conversion performance under low Fermi energy. Furthermore, two equivalent circuits in the x and y directions are developed to understand the working mechanism of the device.
Chinese Optics Letters
  • Publication Date: Jan. 10, 2020
  • Vol. 18 Issue 1 013102 (2020)