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A Polarization-Insensitive Broadband Metamaterial Absorber at the Optical Regime 被引量:1
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作者 史俊贤 张文超 +5 位作者 许婉 朱青 江夏 李冬冬 闫长春 张道华 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第9期54-57,共4页
We present a polarization-insensitive broadband absorber which has a feature of metal-insulator-metal structures. The top metal layer consists of four-fan-rings-shaped gold. Simulations show that the absorber exhibits... We present a polarization-insensitive broadband absorber which has a feature of metal-insulator-metal structures. The top metal layer consists of four-fan-rings-shaped gold. Simulations show that the absorber exhibits an absorption of nearly unity at the wavelength of 386.1 nm and a relative absorption bandwidth of 0.548, which refers to the ratio of the full absorption bandwidth over an absorption of 0.9 to the central wavelength. Meanwhile, the absorption is nearly independent of the polarized direction of the incident wave. This absorption bandwidth with insensitive polarization is widely reported to date for such metal-insulator-metal structures. Such a structure offers a way of realization of a polarization-insensitive broadband absorber ranging in ultraviolet-to-visible wavelengths. 展开更多
关键词 RAB A Polarization-Insensitive broadband Metamaterial Absorber at the optical Regime
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Research progress of cholesteric liquid crystals with broadband reflection characteristics in application of intelligent optical modulation materials 被引量:1
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作者 张兰英 高延子 +9 位作者 宋平 武晓娟 苑晓 何宝凤 陈兴武 胡望 郭仁炜 丁杭军 肖久梅 杨槐 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第9期13-23,共11页
Cholesteric liquid crystals(CLCs) have recently sparked an enormous amount of interest in the development of soft matter materials due to their unique ability to self-organize into a helical supra-molecular architec... Cholesteric liquid crystals(CLCs) have recently sparked an enormous amount of interest in the development of soft matter materials due to their unique ability to self-organize into a helical supra-molecular architecture and their excellent selective reflection of light based on the Bragg relationship.Nowadays,by the virtue of building the self-organized nanostructures with pitch gradient or non-uniform pitch distribution,extensive work has already been performed to obtain CLC films with a broad reflection band.Based on authors' many years' research experience,this critical review systematically summarizes the physical and optical background of the CLCs with broadband reflection characteristics,methods to obtain broadband reflection of CLCs,as well as the application in the field of intelligent optical modulation materials.Combined with the research status and the advantages in the field,the important basic and applied scientific problems in the research direction are also introduced. 展开更多
关键词 cholesteric liquid crystals soft matter materials broadband reflection characteristics intelligent optical modulation materials
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A High-Efficiency Broadband Superconducting Nanowire Single-Photon Detector with a Composite Optical Structure 被引量:1
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作者 顾敏 康琳 +6 位作者 张蜡宝 赵清源 郏涛 万超 徐睿莹 杨小忠 吴培亨 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第3期145-148,共4页
Superconducting nanowire single-photon detectors (SNSPDs) with a composite optical structure composed of phase-grating and optical cavity structures are designed to enhance both the system detection efficiency and t... Superconducting nanowire single-photon detectors (SNSPDs) with a composite optical structure composed of phase-grating and optical cavity structures are designed to enhance both the system detection efficiency and the response bandwidth. Numerical simulation by the finite-difference time-domain method shows that the photon absorption capacity of SNSPDs with a composite optical structure can be enhanced significantly by adjusting the parameters of the phase-grating and optical cavity structures at multiple frequency bands. The absorption capacity of the superconducting nanowires reaches 70%, 72%, 60.73%, 61.7%, 41.2%, and 46.5% at wavelengths of 684, 850, 732, 924, 1256, and 1426nm, respectively. The use of a composite optical structure reduces the total filling factor of superconducting nanowires to only 0.25, decreases the kinetic inductance of SNSPDs, and improves the count rates. 展开更多
关键词 LENGTH A High-Efficiency broadband Superconducting Nanowire Single-Photon Detector with a Composite optical Structure
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Janus aramid nanofiber aerogel incorporating plasmonic nanoparticles for high-efficiency interfacial solar steam generation
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作者 Hui Zhang Lei Feng +5 位作者 Fengyue Wang Mingze Liu Yingying Zhang Jia Zhu Yanqing Lu Ting Xu 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2023年第5期30-40,共11页
Interfacial solar steam generation(ISSG)is a novel and potential solution to global freshwater crisis.Here,based on a facile sol-gel fabrication process,we demonstrate a highly scalable Janus aramid nanofiber aerogel(... Interfacial solar steam generation(ISSG)is a novel and potential solution to global freshwater crisis.Here,based on a facile sol-gel fabrication process,we demonstrate a highly scalable Janus aramid nanofiber aerogel(JANA)as a high-efficiency ISSG device.JANA performs near-perfect broadband optical absorption,rapid photothermal conversion and effective water transportation.Owning to these features,efficient desalination of salty water and purification of municipal sewage are successfully demonstrated using JANA.In addition,benefiting from the mechanical property and chemical stability of constituent aramid nanofibers,JANA not only possesses outstanding flexibility and fire-resistance properties,but its solar steaming efficiency is also free from the influences of elastic deformations and fire treatments.We envision JANA provides a promising platform for mass-production of high-efficiency ISSG devices with supplementary capabilities of convenient transportation and long-term storage,which could further promote the realistic applications of ISSG technology. 展开更多
关键词 plasmonics interfacial solar steam generation broadband optical absorption AEROGEL
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Broadband ultrafast nonlinear optical response of few-layers graphene: toward the mid-infrared regime 被引量:7
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作者 Lili Miao Yaqin Jiang +4 位作者 Shunbin Lu Bingxin Shi Chujun Zhao Han Zhang Shuangchun Wen 《Photonics Research》 SCIE EI 2015年第5期214-219,共6页
Gapless linear energy dispersion of graphene endows it with unique nonlinear optical properties, including broadband nonlinear absorption and giant nonlinear refractive index. Herein, we experimentally observed that f... Gapless linear energy dispersion of graphene endows it with unique nonlinear optical properties, including broadband nonlinear absorption and giant nonlinear refractive index. Herein, we experimentally observed that fewlayers graphene has obvious nonlinear absorption and large nonlinear refraction, as investigated by the Z-scan technique in the mid-infrared(mid-IR) regime. Our study may not only, for the first time to our knowledge, verify the giant nonlinear refractive index of graphene(~10-7cm2∕W) at the mid-IR, which is 7 orders of magnitude larger than other conventional bulk materials, but also provide some new insights for graphene-based mid-IR photonics,potentially leading to the emergence of several new conceptual mid-IR optoelectronics devices. 展开更多
关键词 broadband ultrafast nonlinear optical response of few-layers graphene toward the mid-infrared regime FLG IR mode
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Flexible,robust and highly efficient broadband nonlinear optical materials based on graphene oxide impregnated polymer sheets 被引量:1
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作者 Xiao-Fang Jiang Lakshminarayana Polavarapu +2 位作者 Hai Zhu Rizhao Ma Qing-Hua Xu 《Photonics Research》 SCIE EI 2015年第3期87-91,共5页
We report a simple solution-processed method for the fabrication of low-cost,flexible optical limiting materials based on graphene oxide(GO) impregnated polyvinyl alcohol(PVA) sheets.Such GO–PVA composite sheets disp... We report a simple solution-processed method for the fabrication of low-cost,flexible optical limiting materials based on graphene oxide(GO) impregnated polyvinyl alcohol(PVA) sheets.Such GO–PVA composite sheets display highly efficient broadband optical limiting activities for femtosecond laser pulses at 400,800,and 1400 nm with very low limiting thresholds.Femtosecond pump–probe measurement results revealed that nonlinear absorption played an important role for the observed optical limiting activities.High flexibility and efficient optical limiting activities of these materials allow these composite sheets to be attached to nonplanar optical sensors in order to protect them from light-induced damage. 展开更多
关键词 GO Flexible robust and highly efficient broadband nonlinear optical materials based on graphene oxide impregnated polymer sheets PVA
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Yb^(3+)/Er^(3+)-Codoped Tungsten-Tellurite Glasses for Broadband Optical Amplifier
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作者 Jiacheng Li Hefang Hu Fuxi Gan Shanghai Institute of Optics and Fine mechanics, CAS, P. R. China 《光学学报》 EI CAS CSCD 北大核心 2003年第S1期82-83,共2页
Emission spectra and fluorescence lifetime of Er3+ in Yb3+/Er3+-codoped tungsten-tellurite glasses were measured. Effects of Yb3+concentration on 1.5μm emission intensity and bandwidth of Er3+ were investigated and a... Emission spectra and fluorescence lifetime of Er3+ in Yb3+/Er3+-codoped tungsten-tellurite glasses were measured. Effects of Yb3+concentration on 1.5μm emission intensity and bandwidth of Er3+ were investigated and a FWHM of 81 nm was demonstrated. 展开更多
关键词 for as ER Codoped Tungsten-Tellurite Glasses for broadband optical Amplifier FWHM were YB
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Theoretical study of broadband near-field optical spectrum of twisted bilayer graphene
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作者 Lu Wen Yijun Liu +5 位作者 Guoyu Luo Xinyu Lv Kaiyuan Wang Wang Zhu Lei Wang Zhiqiang Li 《Frontiers of physics》 SCIE CSCD 2022年第4期67-74,共8页
We theoretically study the broadband near-field optical spectrum of twisted bilayer graphene(TBG)at various twist angles near the magic angle using two different models.The spectrum at low Fermi energy is characterize... We theoretically study the broadband near-field optical spectrum of twisted bilayer graphene(TBG)at various twist angles near the magic angle using two different models.The spectrum at low Fermi energy is characterized by a series of peaks that are almost at the same energies as the peaks in the far-field optical conductivity of TBG.When the Fermi energy is near a van Hove singularity,an additional strong peak appears at finite energy in the near-field spectrum,which has no counterpart in the optical conductivity.Based on a detailed calculation of the plasmon dispersion,we show that these spectroscopic features are associated with interband and intraband plasmons,which can provide critical information about the local band structure and plasmonic excitations in TBG.The near-field peaks evolve systematically with the twist angle,so they can serve as fingerprints for identifying the spatial dependent twist angle in TBG samples.Our findings pave the way for future experimental studies of the novel optical properties of TBG in the nanoscale. 展开更多
关键词 twisted bilayer graphene SNOM broadband near-field optical spectrum optical conductivity magic angle
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Designing broadband fiber optic parametric amplifier based on near-zero single ZDW PCF with ultra-flat nature 被引量:1
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作者 Partha Sona Maji Ritwick Das 《Chinese Optics Letters》 SCIE EI CAS CSCD 2017年第7期31-35,共5页
We propose a broadband fiber optic parametric amplifier(FOPA) based on a near-zero ultra-flat dispersion profile with a single zero-dispersion wavelength(ZDW) by using a selective liquid infiltration technique.The... We propose a broadband fiber optic parametric amplifier(FOPA) based on a near-zero ultra-flat dispersion profile with a single zero-dispersion wavelength(ZDW) by using a selective liquid infiltration technique.The amplifier gain and bandwidth is investigated for a variety of fiber lengths, pump power, and operating wavelengths. It is observed that sufficient peak gains and broader bandwidths can be achieved with a small negative anomalous dispersion(β2≤ 0) and a positive value of the 4th-order dispersion parameter(t β4)around the pump. We can optimize an FOPA with a bandwidth of more than 220 nm around the communications wavelength. 展开更多
关键词 amplifier broadband optic parametric bandwidth infiltration anomalous optimize matching gains
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Ultra-broadband access enabled by fiber optics(Invited Paper)
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作者 Frank Effenberger 《Chinese Optics Letters》 SCIE EI CAS CSCD 2016年第12期17-20,共4页
The advent of low loss optical fiber has consistently led us to the ultra-broadband era, where bandwidths exceeding 1 Gb/s are commonplace. This Review reviews the early history of fiber access, pointing out some of t... The advent of low loss optical fiber has consistently led us to the ultra-broadband era, where bandwidths exceeding 1 Gb/s are commonplace. This Review reviews the early history of fiber access, pointing out some of the lasting design choices and signature features of fiber access. The progress of the various passive optical network technologies is also reviewed, and some views regarding the future trends of fiber in the access. 展开更多
关键词 broadband consistently optics pointing signature lasting exceeding deployment bandwidth enabled
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Highly nonlinear bored core hexagonal photonic crystal fiber(BC-HPCF)with ultra-high negative dispersion for fiber optic transmission system
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作者 Md.Mostafa FARUK Nazifa Tabassum KHAN Shovasis Kumar BISWAS 《Frontiers of Optoelectronics》 EI CSCD 2020年第4期433-440,共8页
In this paper,we propose a bored core hexagonal photonic crystal fiber(BC-HPCF)which obtains ultra-high negative dispersion and large nonlinearity simultaneously.The aim of the proposed design is to achieve the desire... In this paper,we propose a bored core hexagonal photonic crystal fiber(BC-HPCF)which obtains ultra-high negative dispersion and large nonlinearity simultaneously.The aim of the proposed design is to achieve the desired optical properties by using circular air holes only to make the fiber simple and manufacturable.To investigate the light guiding properties of the proposed BC-HPCF,finite element method(FEM)with circular perfectly matched boundary layer(PML)is used.According to numerical simulation,it is possible to obtain a large value of negative dispersion of-2102 ps·nm^(-1)•km^(-1)and large value of nonlinearity of 111.6 W^(-1)·km^(-1)at optimum wavelength of 1550 nm.In addition,±2%deviation in optical characteristics is evaluated and reported in order to study the practical feasibility of the proposed BC-HPCF.The large negative dispersion and high nonlinearity of our proposed design make it a strong candidate for optical broadband communication,super continuum generation,and sensing. 展开更多
关键词 photonic crystal fiber(PCF) dispersion NONLINEARITY optical broadband communication
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