Volume: 18 Issue 7
22 Article(s)

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Research Articles
Atomic and Molecular Optics
Biomedical Optics
Three-dimensional tracking of multiple particles in large depth of field using dual-objective bifocal plane imaging
Aiwang Huang, Danni Chen, Heng Li, Dexiang Tang, Bin Yu, Jia Li, and Junle Qu
Tracking moving particles in cells by single particle tracking is an important optical approach widely used in biological research. In order to track multiple particles within a whole cell simultaneously, a parallel tracking approach with large depth of field was put forward. It was based on distorted grating and dual-objective bifocal imaging, making use of the distorted grating to expand the depth of field, dual-objective to gather as many photons as possible, and bifocal plane imaging to realize three-dimensional localization. Simulation of parallel tracking of two particles moving along the z axis demonstrated that even when the two are axially separated by 10 μm, they can both be localized simultaneously with transversal precision better than 5 nm and axial precision better than 20 nm.
Chinese Optics Letters
  • Publication Date: Jun. 11, 2020
  • Vol.18 Issue, 7 071701 (2020)
Diffraction and Gratings
A broadband polarization-independent two-port beam splitter under normal incidence based on encapsulated metal-dielectric reflective grating
Zhengkun Yin, Yunkai Lu, Junjie Yu, and Changhe Zhou
An encapsulated metal-dielectric reflective grating is presented for broadband polarization-independent two-port beam splitting under normal incidence at the central wavelength of 800 nm. Different from traditional two-port grating splitters in the resonant region, this grating splitter is capable of separating light energy into ±1st orders with high efficiency in a broad waveband for both TE and TM polarizations. A unified method is proposed here for designing this grating splitter, which enables one to choose a grating structure quickly to realize an ultrabroad working waveband. The simulation results indicate that a bandwidth of 46.4 nm could be achieved for diffraction efficiency (defined as the ratio of the light energy diffracted only at the first order to the incident light energy) over 46% at the central wavelength of 800 nm. Moreover, the parameters of the grating structure can be flexibly adjusted with wavelengths using the unified method for various other applications, such as augmented reality, optical interconnections for computing, coherent beam combination, and complex vector beam shaping.
Chinese Optics Letters
  • Publication Date: May. 27, 2020
  • Vol.18 Issue, 7 070501 (2020)
Fiber Optics and Optical Communications
DOE effect on BER performance in MSK space uplink chaotic optical communication
Mi Li, Yuan Chen, Yuejiang Song, Cheng Zeng, and Xuping Zhang
With the increasing demand for space optical communication security, space chaotic optical communication has attracted a great amount of attention. Compared with traditional space optical communication, a chaotic optical communication system has a higher bit error rate (BER) for its complex system design. In order to decrease the BER of space chaotic optical communication systems, we introduce two diffractive optical elements (DOEs) at a transmitting terminal (Tx). That is because the commonly used reflective optical antenna at Tx blocks the central part of the transmission beam, which leads to a great amount of power consumption. Introducing the DOEs into the optical subsystem at Tx can reshape the transmission beam from a Gaussian distribution to a hollow Gaussian distribution so that the block of the secondary mirror in the reflective optical antenna can be avoided. In terms of the DOE influence on communication quality, we give a BER model based on a minimum-shift-key (MSK) space uplink chaotic optical communication system to describe the DOE function. Based on the model, we further investigate the effect of the DOEs through analyzing the BER relationship versus basic system parameters based on the BER model. Both different mismatch conditions of chaotic systems and different atmospheric turbulence conditions are considered. These results will be helpful for the scheme design of space uplink chaotic optical communication systems.
Chinese Optics Letters
  • Publication Date: May. 25, 2020
  • Vol.18 Issue, 7 070601 (2020)
Real-time spatiotemporal division multiplexing electroholography for 1,200,000 object points using multiple-graphics processing unit cluster
Hiromi Sannomiya, Naoki Takada, Kohei Suzuki, Tomoya Sakaguchi, Hirotaka Nakayama, Minoru Oikawa, Yuichiro Mori, Takashi Kakue, Tomoyoshi Shimobaba, and Tomoyoshi Ito
Chinese Optics Letters
  • Publication Date: Jun. 15, 2020
  • Vol.18 Issue, 7 070901 (2020)
Imaging Systems
Performance comparison of ghost imaging versus conventional imaging in photon shot noise cases
Zijie Li, Qing Zhao, and Wenlin Gong
The performances of ghost imaging and conventional imaging in photon shot noise cases are investigated. We define an imaging signal-to-noise ratio called SNRtran where only the object’s transmission region is used to evaluate the imaging quality and it can be applied to ghost imaging (GI) with any random pattern. Both the values SNRGItran of GI and SNRCItran of conventional imaging in photon shot noise cases are deduced from a simple statistical analysis. The analytical results, which are backed up by numerical simulations, demonstrate that the value SNRGItran is related to the ratio between the object’s transmission area Ao and the number density of photons illuminating the object plane Io, which is similar to the theoretical results based on the first principle of GI with a Gaussian speckle field deduced by B. I. Erkmen and J. H. Shapiro [in Adv. Opt. Photonics 2, 405–450 (2010)]. In addition, we also show that the value SNRCItran will be larger than SNRGItran when Ao is beyond a threshold value.
Chinese Optics Letters
  • Publication Date: May. 25, 2020
  • Vol.18 Issue, 7 071101 (2020)
Lasers and Laser Optics
25 Gb/s directly modulated ground-state operation of 1.3 μm InAs/GaAs quantum dot lasers up to 75°C
Zhongkai Zhang, Zunren Lü, Xiaoguang Yang, Hongyu Chai, Lei Meng, and Tao Yang
Chinese Optics Letters
  • Publication Date: May. 25, 2020
  • Vol.18 Issue, 7 071401 (2020)
High-repetition-rate pulsed fiber laser based on virtually imaged phased array
Xuanjuan Chen, Yuxin Gao, Jiamin Jiang, Meng Liu, Aiping Luo, Zhichao Luo, and Wencheng Xu
Chinese Optics Letters
  • Publication Date: Jun. 08, 2020
  • Vol.18 Issue, 7 071403 (2020)
Room-temperature synthesis of cyan CsPb(Cl/Br)3/SiO2 nanospheres with LiCl-H2O solution
Peiyuan Cao, Bobo Yang, Yanrong Cao, Fei Zheng, and Jun Zou
There are many strategies to maintain the excellent photoluminescence (PL) characteristics of perovskite quantum dots (QDs). Here, we proposed a facile and effective method to prepare cyan CsPb(Cl/Br)3/SiO2 nanospheres at room temperature. Cubic CsPb(Cl/Br)3 was obtained by adding a LiCl-H2O solution and anion exchange reaction. With (3-aminopropyl)triethoxysilane as an auxiliary agent, a QDs/SiO2 composite was extracted from a sol-gel solution by precipitate-encapsulation method. The transmission electron microscopy images and Fourier transform infrared spectra indicated the QDs were indeed embedded in silica substances. Besides, humidity stability and thermal stability show the composite possesses a great application value. Finally, cyan QDs@SiO2 powder has a high PL quantum yield of up to 84%; the stable cyan fluorescent powder does have great potential to play a key role in commercial full spectrum display.
Chinese Optics Letters
  • Publication Date: Jun. 12, 2020
  • Vol.18 Issue, 7 071601 (2020)
Rectangular dielectric metagrating for high-efficiency diffraction with large-angle deflection | On the Cover
Weiyi Shi, Weimin Deng, Weinan Liu, Zepeng Zhuang, Zhibin Fan, and Jianwen Dong
Chinese Optics Letters
  • Publication Date: Jun. 16, 2020
  • Vol.18 Issue, 7 073601 (2020)
Nonlinear Optics
Spectral analysis of short-wavelength emission by up-conversion in a Tm3+:ZBLAN dual-diode-pumped optical fiber
M. Juárez-Hernández, and E. B. Mejía
Chinese Optics Letters
  • Publication Date: May. 27, 2020
  • Vol.18 Issue, 7 071901 (2020)
Frequency-doubled vortex beam emitter based on nonlinear Cherenkov radiation
Chen Lin, Yan Chen, Xiaoyang Li, Lei Yang, Rui Ni, Gang Zhao, Yong Zhang, Xiaopeng Hu, and Shining Zhu
Chinese Optics Letters
  • Publication Date: Jun. 15, 2020
  • Vol.18 Issue, 7 071902 (2020)
Affirming nonlinear optical coefficient constancy from z-scan measurement | Editors' Pick
Shijia Hua, Kang Du, Heng Wang, Wending Zhang, Ting Mei, and Elhadj Dogheche
Goodness of fit is demonstrated for theoretical calculation of z-scan data based on beams propagating in the nonlinear medium and the Fresnel–Kirchhoff diffraction integral in experiments with high nonlinear refraction and absorption. The constancy of nonlinear optical parameters is achieved regardless of sample thickness and laser intensity, which clarifies the physical significance of optical parameters. We have obtained γ = 2.0 × 10-19 m2/W and β = 5.0 × 10-13 m/W for carbon disulfide excited by a pulsed laser at 800 nm with pulse duration of 35 fs, which are independent of sample thickness and laser intensity. Affirming constancy of the extracted parameters to the incident light intensity may become a practice to verify the goodness of the z-scan experiment.
Chinese Optics Letters
  • Publication Date: Jun. 11, 2020
  • Vol.18 Issue, 7 071903 (2020)
Optical Design and Fabrication
Dynamic aberrations correction of Roll-Nod conformal seeker based on the diffraction surface and anamorphic asphere surface
Yunqiang Zhang, Jun Chang, Fanyang Dang, Xiaodong Bai, and Guoqing Pan
Traditional optical domes are spherical, which have a large air resistance coefficient. In order to reduce the coefficient of air resistance, conformal optical technology was proposed, which used a streamlined design of the outer surface of the dome. However, conformal domes generate dynamic aberrations varying significantly with look angles in the field of regard (FOR). Thus, correcting the dynamic aberrations is the core task of conformal optics. This Letter presented a correcting method of dynamic aberrations based on the diffraction surface and anamorphic asphere surface. This method is derived from the arch corrector and can only be used on the Roll-Nod gimbal. For the seeker with a Roll-Nod gimbal, the arch corrector is replaced with a diffractive surface superimposed on the inner surface of the conformal dome. To correct astigmatism, which is the main aberration that needs to be corrected, anamorphic asphere surfaces are used in the imaging system. Compared with the arch corrector, this method can reduce the size of the correction element while retaining sufficient design freedom. Design results show that this method can well correct the dynamic aberrations in a larger FOR. With a simpler form in structure, this method can improve the reliability of conformal optical systems and promote the application of conformal optical technology.
Chinese Optics Letters
  • Publication Date: May. 26, 2020
  • Vol.18 Issue, 7 072201 (2020)
Optical Sensing, Measurements, and Metrology
Demodulation of the multi-peak fiber Bragg grating sensor based on partial wavelength scan
Pan Dai, Yu Zhou, Leilei Wang, Shangjing Liu, Xuping Zhang, and Xiangfei Chen
Chinese Optics Letters
  • Publication Date: Jun. 15, 2020
  • Vol.18 Issue, 7 071201 (2020)
Multi-channel polarized low-coherence interference synchronous demodulation system based on a matrix charge-coupled device
Shuang Wang, Jie Zhou, Junfeng Jiang, Kun Liu, Qun Han, Yanan Duan, Rundong Wang, and Tiegen Liu
A multi-channel synchronous demodulation system of a polarized low-coherence interferometer (PLCI) based on a matrix charge-coupled-device (CCD) is proposed and demonstrated. By using special designs, the system allows the signals from different channels to be received and demodulated synchronously. Multichannel air pressure experiments were implemented to verify the effectiveness of the proposed system. The experiment results showed that the Fabry–Perot (F–P) sensors could be demodulated synchronously with a high tolerance for light sources and sensors, which indicated that any sensor and light source that can be demodulated by PLCI were allowed to be employed, leading to a wide application in the field of multichannel synchronous measurement.
Chinese Optics Letters
  • Publication Date: Jun. 12, 2020
  • Vol.18 Issue, 7 071202 (2020)
Ultra-high resolution microwave photonic radar with post-bandwidth synthesis
Cong Ma, Hao Chen, Xingwei Ye, Xiangchuan Wang, and Shilong Pan
Chinese Optics Letters
  • Publication Date: May. 25, 2020
  • Vol.18 Issue, 7 072501 (2020)
Plasmonics and Metamaterials
Effective medium theory of checkboard structures in the long-wavelength limit
Zhanlei Hao, Yawen Zhuang, Ying Chen, Yineng Liu, and Huanyang Chen
Chinese Optics Letters
  • Publication Date: May. 27, 2020
  • Vol.18 Issue, 7 072401 (2020)
Ultrafast Optics
THz generation from water wedge excited by dual-color pulse
Min Li, Zhenyu Li, Junyi Nan, Yu Xia, Mingyang He, Feng Wang, Wenhui Lu, Shuai Yuan, and Heping Zeng
Chinese Optics Letters
  • Publication Date: Jun. 09, 2020
  • Vol.18 Issue, 7 073201 (2020)