2019
2019
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Record 493 of
Title:Reconfigurable snapshot polarimetric imaging technique through spectral-polarization filtering
Author(s):Liang, Jian(1,2); Tian, Xiaobo(2); Ju, Haijuan(1); Wang, Daodang(2); Wu, Heng(2); Ren, Liyong(1,3); Liang, Rongguang(2)Source: Optics Letters Volume: 44 Issue: 18 DOI: 10.1364/OL.44.004574 Published: September 15, 2019Abstract:In this Letter, we propose a simple, low-cost, reconfigurable snapshot polarimetric imaging technique for a color camera to measure polarization properties with spectral-polarization filters. Experimental results demonstrate the unique capabilities, such as obtaining circular or elliptical polarized information in a snapshot, that are not available from commercial polarization cameras and other polarization imaging techniques. ? 2019 Optical Society of AmericaAccession Number: 20193707439974 -
Record 494 of
Title:High performance RF filters via bandwidth scaling with Kerr micro-combs
Author(s):Xu, Xingyuan(1); Tan, Mengxi(1); Wu, Jiayang(1); Nguyen, Thach G.(2); Chu, Sai T.(3); Little, Brent E.(4); Morandotti, Roberto(5,6,7); Mitchell, Arnan(2); Moss, David J.(1)Source: APL Photonics Volume: 4 Issue: 2 DOI: 10.1063/1.5080246 Published: February 1, 2019Abstract:We demonstrate high-resolution photonic RF filters using an RF bandwidth scaling approach based on integrated Kerr optical micro-combs. By employing both an active nonlinear micro-ring resonator (MRR) as a high-quality micro-comb source and a passive high-Q MRR to slice the RF spectra modulated on the shaped comb, a large RF instantaneous bandwidth of 4.64 GHz and a high resolution of 117 MHz are achieved, together with a broad RF operation band covering 3.28-19.4 GHz (L to Ku bands) using thermal tuning. We achieve programmable RF transfer functions including binary-coded notch filters and RF equalizing filters with reconfigurable slopes. Our approach is an attractive solution for RF spectral shaping with high performance and flexibility. ? 2019 Author(s).Accession Number: 20190706501970 -
Record 495 of
Title:Compact low-noise passively mode-locked Er-doped femtosecond all-fiber laser with 2.68 GHz fundamental repetition rate
Author(s):Song, Jiazheng(1,2); Wang, Hushan(1,2); Huang, Xinning(1,2); Hu, Xiaohong(1); Zhang, Ting(1,2); Wang, Yishan(1); Liu, Yuanshan(1); Zhang, Jianguo(1,3)Source: Applied Optics Volume: 58 Issue: 7 DOI: 10.1364/AO.58.001733 Published: March 1, 2019Abstract:A passively mode-locked Er-doped fiber laser with a fundamental repetition rate of 2.68 GHz is reported. The oscillator operating at a central wavelength of 1558.35 nm has a compact, robust structure and low-noise performance. The timing jitter integrated from 30 MHz down to 300 Hz is 82.5 fs, and the timing jitter performance is analyzed based on the theory model. The amplification and compression of the high repetition rate optical pulses are also investigated. After a three-stage amplifier, the average power is boosted to 430 mW. Meanwhile, based on the nonlinear self-phase modulation effect, the spectral bandwidth is broadened from 7.56 to 19.2 nm, and the corresponding pulse width is compressed to 244 fs. ? 2019 Optical Society of America.Accession Number: 20191006584437 -
Record 496 of
Title:Optofluidic in-fiber integrated surface-enhanced Raman spectroscopy detection based on a hollow optical fiber with a suspended core
Author(s):Gao, Danheng(1); Yang, Xinghua(1); Teng, Pingping(1); Liu, Zhihai(1); Yang, Jun(1); Kong, Depeng(2); Zhang, Jianzhong(1); Luo, Meng(1); Li, Zhanao(1); Tian, Fengjun(1); Yuan, Libo(1,3)Source: Optics Letters Volume: 44 Issue: 21 DOI: 10.1364/OL.44.005173 Published: November 1, 2019Abstract:In this Letter, we propose, to the best of our knowledge, the first in-fiber optofluidic Raman surface-enhanced Raman spectroscopy (SERS) sensor based on a microstructured hollow fiber (MHF) with a suspended core. Taking advantage of the unique internal structure, we immobilize silver nanoparticles with an SERS effect in the MHF by chemical bonding. The Raman signal of the microfluidic sample is excited by the excitation light in the suspended core through an evanescent field. Then the online SERS signal can be coupled back into the core and detected. To demonstrate the feasibility of the device, rhodamine 6G is chosen as the analyte, and high-quality SERS spectra are detected with the limit of detection of 1 × 10?14 M. Furthermore, an online optofluidic test is conducted on ceftriaxone (C18H18N8O7S3) to examine its capabilities in antibiotic sensing. The results show that the LOD of the samples is 10?6 M. Significantly, this Letter provides an integrated optofluidic in-fiber SERS sensor with a micro-channel that can be integrated with chip devices without spatial optical coupling, which has a broad application in medicine and food safety, as well as various aspects of biological in-fiber sensing. ? 2019 Optical Society of America.Accession Number: 20194507634515 -
Record 497 of
Title:Easy method to measure the packaging-induced stress of a semiconductor laser diode by lasing wavelength shifting
Author(s):Zhang, Hongyou(1,2,3); Fu, Tuanwei(3); Zah, Chung-En(3); Liu, Xingsheng(1,2,3,4)Source: Applied Optics Volume: 58 Issue: 24 DOI: 10.1364/AO.58.006672 Published: August 20, 2019Abstract:In this paper, the packaging-induced stresses are theoretically calculated by modeling multilayered structures for different packaging structures. We report a method to measure the packaging-induced stress of a laser diode array (LDA) by comparing the emission wavelength of the single emitter located in the middle of a laser bar before and after packaging. The wavelength is tested under a low duty cycle (50 μs/10 Hz, DC 0.05%) to eliminate the thermal effect to wavelength shifting. Experimental calculation results for the packaging-induced stress of LDAs are in good agreement with the theoretical calculations and simulation results. For a GaAs laser bar, we find the packaging stresses are compression stresses, which make the emission wavelength blue-shift in terms of 1.09 × 10?2 nm∕MPa. We propose a mapping of packaging-induced stress distribution in laser bars on a microscopic scale by considering the emission spectra of each emitter in a laser bar. Compared to single-emitter resolved photo-current or micro-photoluminescence measurements, as proposed by other authors, we offer a much easier tool to test and map the distribution of packaging-induced stress in laser bars. ? 2019 Optical Society of America.Accession Number: 20193407351742 -
Record 498 of
Title:On-line dynamic detection in the column chromatography separation based on an optical fiber surface plasmon resonance sensor
Author(s):Cao, Jiaming(1); Yang, Xinghua(1); Teng, Pingping(1); Liu, Zhihai(1); Yang, Jun(1); Zhang, Jianzhong(1); Zhang, Yu(1); Luo, Meng(1); Gao, Danheng(1); Kong, Depeng(2); Xia, Siyuan(1); Zhao, Enming(1); Yuan, Libo(1,3)Source: Applied Optics Volume: 58 Issue: 21 DOI: 10.1364/AO.58.005774 Published: 2019Abstract:In this design, we introduced a surface plasmon resonance (SPR) fiber-sensing probe into a column chromatography (CC) system to realize on-line dynamic detection in sample separation. The refractive index of the gel around the probe would be adjusted dynamically by the concentration change of the sample during CC separation. To demonstrate the separation and on-line detection process, bovine serum albumin (BSA) and riboflavin-5-phosphate sodium (FMN-Na) are chosen as the analytes in a Sephadex gel filtration chromatography system. The results show that the apparent reversible shift of the SPR spectrum can characterize the separation process. Specifically, the separated BSA with an outflow time of 8 min can cause a resonance wavelength shift of 15.5 nm, and the FMN-Na with an outflow time of 26 min can cause a shift of 8.4 nm. This on-line dynamic detection of SPR spectra has great potential to save time and simplify the analysis process compared to the complex thin layer chromatography detection steps in traditional manual CC. ? 2019 Optical Society of AmericaAccession Number: 20192907217558 -
Record 499 of
Title:A survey on sentiment analysis and opinion mining for social multimedia
Author(s):Li, Zuhe(1); Fan, Yangyu(2); Jiang, Bin(1); Lei, Tao(3); Liu, Weihua(4)Source: Multimedia Tools and Applications Volume: 78 Issue: 6 DOI: 10.1007/s11042-018-6445-z Published: March 1, 2019Abstract:Social media sentiment analysis (also known as opinion mining) which aims to extract people’s opinions, attitudes and emotions from social networks has become a research hotspot. Conventional sentiment analysis concentrates primarily on the textual content. However, multimedia sentiment analysis has begun to receive attention since visual content such as images and videos is becoming a new medium for self-expression in social networks. In order to provide a reference for the researchers in this active area, we give an overview of this topic and describe the algorithms of sentiment analysis and opinion mining for social multimedia. Having conducted a brief review on textual sentiment analysis for social media, we present a comprehensive survey of visual sentiment analysis on the basis of a thorough investigation of the existing literature. We further give a summary of existing studies on multimodal sentiment analysis which combines multiple media channels. We finally summarize the existing benchmark datasets in this area, and discuss the future research trends and potential directions for multimedia sentiment analysis. This survey covers 100 articles during 2008–2018 and categorizes existing studies according to the approaches they adopt. ? 2018, Springer Science+Business Media, LLC, part of Springer Nature.Accession Number: 20183405717034 -
Record 500 of
Title:Optical properties of an Er3+-doped phosphate glass waveguide formed by single-energy H+ ion implantation
Author(s):Chen, Jing-yi(1); Yan, Sen(1); Zheng, Rui-lin(1); Zhang, Liao-lin(2); Guo, Hai-tao(3); Liu, Chun-xiao(1)Source: Optoelectronics Letters Volume: 15 Issue: 2 DOI: 10.1007/s11801-019-8103-8 Published: March 1, 2019Abstract:In this work, we report the fabrication of an optical waveguide by single-energy H+ ion implantation in the Er3+-doped phosphate glass. The ion implantation conditions are with energy of 0.4 MeV and a fluence of 8.0×1016 ions/cm2. The dark mode spectrum of the waveguide structure was measured by the prism coupling experiment. The refractive index change along with the penetration depth was fitted by using the reflectivity calculation method (RCM). Finally, the calculated near-field light intensity distribution shows superior waveguide properties, which demonstrates its promising potentials for compact optical integrated devices. ? 2019, Tianjin University of Technology and Springer-Verlag GmbH Germany, part of Springer Nature.Accession Number: 20191906898065 -
Record 501 of
Title:Rapid wide-field imaging through scattering media by digital holographic wavefront correction
Author(s):Li, Runze(1,2,3); Peng, Tong(1,2,3); Zhou, Meiling(1,3); Yu, Xianghua(1,2); Gao, Peng(1,2); Min, Junwei(1,2); Yang, Yanlong(1); Lei, Ming(1,2); Yao, Baoli(1,2); Zhang, Chunmin(2); Ye, Tong(4)Source: Applied Optics Volume: 58 Issue: 11 DOI: 10.1364/AO.58.002845 Published: April 10, 2019Abstract:Imaging through scattering media has been a long standing challenge in many disciplines. One of the promising solutions to address the challenge is the wavefront shaping technique, in which the phase distortion due to a scattering medium is corrected by a phase modulation device such as a spatial light modulator (SLM). However, the wide-field imaging speed is limited either by the feedback-based optimization to search the correction phase or by the update rate of SLMs. In this report, we introduce a new method called digital holographic wavefront correction, in which the correction phase is determined by a single-shot off-axis holography. The correction phase establishes the so-called "scattering lens", which allows any objects to be imaged through scattering media; in our case, the "scattering lens" is a digital one established through computational methods. As no SLM is involved in the imaging process, the imaging speed is significantly improved. We have demonstrated that moving objects behind scattering media can be recorded at the speed of 2.8 fps with each frame corrected by the updated correction phase while the image contrast is maintained as high as 0.9. The image speed can potentially reach the video rate if the computing power is sufficiently high. We have also demonstrated that the digital wavefront correction method also works when the light intensity is low, which implicates its potential usefulness in imaging dynamic processes in biological tissues. ? 2019 Optical Society of AmericaAccession Number: 20191606776443 -
Record 502 of
Title:Effect of glass composition on the physical properties and luminescence of Pr3+ ion-doped chalcogenide glasses
Author(s):Ma, Chengcheng(1); Guo, Haitao(2); Xu, Yinsheng(1,2); Wu, Zhihao(1); Li, Mingming(1); Jia, Xiaomeng(1); Nie, Qiuhua(1)Source: Journal of the American Ceramic Society Volume: 102 Issue: 11 DOI: 10.1111/jace.16592 Published: November 1, 2019Abstract:In this work, Pr3+ ion-doped Ge20Ga15?xSbxSe65 (x?=?0, 5, 10, in mol%), Ge20Sb15?yInySe65 (y?=?5, 10, in mol%), Ge20Ga15?zInzSe65 (z?=?0, 5, 10, in mol%), and Ge20Ga5Sb10Se60I5 glasses were prepared. The structural units, thermal properties, and optical properties of these glasses were analyzed. In addition, a comprehensive comparison study of the effects of metal ions (Sb, Ga, and In), S/Se ratio, and I content on the mid-infrared (MIR) luminescence of Pr3+ ions was conducted. Under a 1.55-μm laser pump, 0.2?mol% of Pr3+ ion-doped chalcogenide glasses performed strong photoluminescence in the wavelength range of 3.5-5.5?μm. Results indicated that the Sb-containing glass performed the strongest emission intensity among the studied glasses. Moreover, halogen element I can reduce the phonon energy of the matrix, which is beneficial to the luminescence of Pr3+ ions and provide significant possibilities for developing MIR lasers and amplifiers. ? 2019 The American Ceramic SocietyAccession Number: 20193607409158 -
Record 503 of
Title:Study on the performance of double filtering based on an acousto-optic tunable filter
Author(s):Zhang, Xiaofa(1); Zhang, Chunguang(1); Chen, Yaqi(1); Wang, Hao(1,2); Sheng, Zhenfei(1); Huang, Xi(1); Tan, Zhiwei(1); Qiu, Weijie(1); Wang, Pengchong(1,2); Zheng, Ruoling(1); Zeng, Xueqing(1); Lai, Rongcheng(1); Yu, Jiaying(1)Source: Physica Scripta Volume: 94 Issue: 11 DOI: 10.1088/1402-4896/ab2061 Published: August 1, 2019Abstract:The performance parameters of an acousto-optic tunable filter (AOTF) determine its application range. In order to further expand the application field of the AOTF, a system is built based on a single crystal. In this system, the difference between single filtering and double filtering with a single crystal tellurium dioxide (TeO2), including spectral bandwidth and side lobe, is studied using a broadband light source. The experimental results indicate that single crystal double filtering has the advantages of a narrow spectral bandwidth and side lobe suppression. In addition, the diffraction efficiency of single crystal double filtering is measured experimentally. ? 2019 IOP Publishing Ltd.Accession Number: 20194507644963 -
Record 504 of
Title:Initial structure of large aperture diffractive telescope
Author(s):Zhao, Wei(1,3,5); Liu, Hua(2,3); Lu, Zi-Feng(2,3); Lu, Zhen-Wu(4); Wang, Xin(1)Source: Chinese Optics Volume: 12 Issue: 6 DOI: 10.3788/CO.20191206.1395 Published: December 1, 2019Abstract:When taking the film diffractive optical elements as main lens, large aperture diffractive telescope has the characteristics such as low mass density(surface mass density can reach 0.1 kg/m2), loose surface shape tolerance(surface accuracy requirements are the magnitude of centimeter) and low launch costs. In this paper, the imaging theory and the configuration of diffractive telescope are discussed. Then, the calculation process of the initial structure of this optical system is derived. A prototype system with 300-mm aperture, 2-m focal length and working wavelength from 0.58 μm to 0.68 μm is designed and star image test and resolution board test are carried out. The test result of star image is close to diffraction limit, which is agree well with the design result. The work in this paper can provide theory foundation and initial model for diffractive telescope designer, and can help them to reduce design time and increase imaging quality. ? 2019, China Science Publishing & Media LTD. All right reserved.Accession Number: 20200508118887