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Tunable and low bending loss of liquid-core fiber

Chinese optics Letters 2010年第1期8卷 14-17页

作者：戴芬芬许永豪陈险峰 Department of Physics the State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication SystemsShanghai Jiao Tong University

The liquid-core fiber with relatively high refractive index difference between the core and cladding is proven to be bending insensitive. The single mode condition and bending loss of the fiber with a mixture of toluene and chloroform as its core material are studied. The results show that the bending loss of this fiber is not only much smaller than the conventional silica single mode fiber but also can be tuned by the temperature and liquid mixture ratio. This kind of fiber may find its potential applications in all-optical network.

关键词： Coremaking fiber optic networks Liquids Refractive index Silica Single mode fibers Toluene

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Nonlinear optics in subwavelength plasmonic nanostructures

Nonlinear optics in subwavelength plasmonic nanostructures

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2011 Conference on Lasers and Electro-optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011

作者： Panoiu, Nicolae C. Biris, Claudiu C. Ye, Fangwei Cao, Lina Osgood Jr., Richard M. Department of Electronic and Electrical Engineering University College London Torrington Place London WC1E 7JE United Kingdom Department of Physics State Key Lab. on Fiber Optic Loc. Area Commun. Networks and Advanced Optical Communication Systems Shanghai Jiao Tong University Shanghai 200240 China Department of Applied Physics and Applied Mathematics Columbia University New York NY 10027 United States

ISBN: (纸本)9781457705335

In the last decade, the advances in integrated optics and photonic nano-devices have been greatly accelerated by the availability of high performance computing platforms and powerful numerical methods for device simulation and computer-aided design. Thus, high fabrication costs of complex photonic nano-devices make it imperative to have access to high-performance computational tools, which can greatly accelerate the device design process and reduce the design-fabrication-testing cycle. In this connection, in this talk we briefly review and compare several numerical methods that are commonly used to model the nonlinear optical properties of plasmonic nano-structures and, subsequently, by using specific examples, we illustrate how these methods can be employed to design and characterize active plasmonic nano-structures with unique optical properties. Examples of such nonlinear effects in plasmonic nanostructures include nonlinear excitation of plasmon modes in plasmonic cavities [1,2], formation of subwavelength plasmonic solitons [3] and plasmonic vortices [4] in plasmonic arrays, and nonlinear wave scattering by defects of metallic surfaces [5]. © 2011 IEEE.

关键词： Plasmonics

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Nonlinear optics in subwavelength plasmonic nanostructures

Nonlinear optics in subwavelength plasmonic nanostructures

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Conference on Lasers and Electro-optics Europe (CLEO EUROPE)

作者： Nicolae C. Panoiu Claudiu C. Biris Fangwei Ye Lina Cao Richard M. Osgood Department of Electronic and Electrical Engineering University College London London UK Department of Physics The State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems Shanghai Jiaotong University Shanghai China Department of Applied Physics and Applied Mathematics Columbia University New York NY USA

ISBN: (纸本)9781457705328

In the last decade, the advances in integrated optics and photonic nano-devices have been greatly accelerated by the availability of high performance computing platforms and powerful numerical methods for device simulation and computer-aided design. Thus, high fabrication costs of complex photonic nano-devices make it imperative to have access to high-performance computational tools, which can greatly accelerate the device design process and reduce the design-fabrication-testing cycle. In this connection, in this talk we briefly review and compare several numerical methods that are commonly used to model the nonlinear optical properties of plasmonic nano-structures and, subsequently, by using specific examples, we illustrate how these methods can be employed to design and characterize active plasmonic nano-structures with unique optical properties. Examples of such nonlinear effects in plasmonic nanostructures include nonlinear excitation of plasmon modes in plasmonic cavities, formation of subwavelength plasmonic solitons and plasmonic vortices in plasmonic arrays, and nonlinear wave scattering by defects of metallic surfaces.

关键词： Computer aided design Nonlinear effects Nonlinear optics optical properties Solitons Subwavelength nanostructures

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Quantum reflection as the reflection of subwaves

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Chinese Physics B 2010年第9期19卷 349-353页

作者：袁文殷澄王贤平曹庄琪 Department of Physics the State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication SystemsShanghai Jiao Tong University Institute of Physics and Communication and Electronics Jiangxi Normal University

This paper studies quantum reflection with recent research on reflection coefficient. Based on the analytical transfer matrix method, a novel explanation for this phenomenon is proposed that quantum reflection is the reflection of subwaves, which originate inherently from the inhomogeneity of the fields and is always neglected in the semiclassical regime. Comparison with exact formula and the numerical calculations for different potentials has confirmed the reliability and the validity of the proposed theory.

关键词： quantum reflection cold atom analytical transfer matrix method

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Polarization-based all-optical logic gates employing electro-optic effect in periodically poled LiNbO3

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Zhongguo Jiguang/Chinese Journal of Lasers 2011年第SUPPL. 1期38卷 s117001-1-s117001-4页

作者： Zhang, Yinxing Chen, Yuping Chen, Xianfeng State Key Lab. on Fiber Optic Local Area Commun. Networks and Advanced Optical Communication Syst. Department of Physics Shanghai Jiao Tong University Shanghai 200240 China

A simple approach based on polarization to process binary all-optical logic signal with validation is proposed, by electro-optic Pokels effect. In experiment, we choose optical signal with two orthogonal linear polarization states to present logic 1 and 0. This approach can alter the polarization state of input optical signal about 90° on the polarization plane based on electro-optic modulation of periodically poled lithium niobate (PPLN). optical signal can be switched between the two orthogonal polarization states, and polarization direction will be not changed without external applied electric field. Therefore, it can realize controllable-NOT function. If we choose external applied electric field to present logic 1 and 0, it can realize NOR and XNOR functions. In this approach, digital logic signal is carried on the polarization state of optical signal. The dissipation of intensity of optical signal is very small in this process, so this approach is more advantageous for multiply cascaded systems, comparing with traditional approach, in which digital logic signal is carried on the intensity of optical signal.

关键词： Electric fields

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Third-Order Nonlinear optical Properties of a Series of Polythiophenes

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Chinese Physics Letters 2010年第7期27卷 101-104页

作者：张小强王长顺陆国元贺廷超 Department of Physics the State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems Shanghai Jiao Tong University Shanghai 200240 Department of Chemistry Nanjing University Nanjing 210093

The third-order nonlinear optical properties of a series of polythiophenes are investigated with the Z-scan method under picosecond pulse laser irradiation at 532nm. The copolymers exhibit a good nonlinear response： large nonlinear refraction coefficients without nonlinear absorption. The signs of nonlinear refraction coefficients are positive, which are opposite to the negative signs of the polythiophene reported before. The mechanism accounting for the process of nonlinear refraction under pulse laser excitation is analyzed from the viewpoint of the electrondonor/acceptor units of polythiophenes. Moreover, changes of nonlinearity according to the lengths of main chains in polythiophene molecules are discussed.

关键词： NONLINEAR optics optical properties POLYTHIOPHENES ULTRASHORT laser pulses COPOLYMERS REFRACTION (optics) NUCLEAR excitation RADIATION measurements

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Infrared laser induced lateral photovoltaic effect observed in Cu 2O nanoscale film

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optics Express 2010年第9期18卷 9113-9118页

作者： Du, Liang Wang, Hui Department of Physics State Key Lab. on Fiber Optic Loc. Area Commun. Networks and Adv. Optical Communication Systems Shanghai Jiao Tong University 800 Dongchuan Rd. Shanghai 200240 China

The large infrared lateral photovoltaic effect (LPE) based on semiconductor structures has been a challenge for a long time because the light in this region is hard to be absorbed. In this study, we report an unusual infrared laser induced LPE observed in sputtered Cu2O thin films. The maximum open-circuit lateral photovoltage can reach up to a remarkable value of 30.6mV under irradiation of Ti: Sapphire laser emitting 100 fs pulses at 2000 nm with pulse energy of 50 μJ. Temperature gradient induced by infrared laser is introduced to interpret this infrared induced LPV effect. The high position sensitivity reaching 15.3mV/mm and easier fabrication techniques suggests this oxidized film a potential candidate for the novel infrared photodetectors. ©2010 optical Society of America.

关键词： Photovoltaic effects

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Generation of isolated sub-100-as pulses with 30-fs lasers

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Physical Review A 2010年第1期82卷 013827-013827页

作者： Songsong Tang Xianfeng Chen Department of Physics State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems Shanghai Jiao Tong University 800 Dong Chuan Road Shanghai 200240 China

We propose a scheme to generate isolated sub-100-as pulses with 30-fs lasers. Our model is based on high-order harmonic generation from a helium atom irradiated by a two-color femtosecond laser field, in which the driving and the control fields are linearly polarized and the polarization angle between them is π/4. By mixing the polarization gating technique and optimization of two-color lasers, we destroy the symmetry of the driving field from two directions and realize quantum path control with multicycle lasers.

关键词： Polarization

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Differentiated Protection Services with Failure Probability Guarantee for Workflow-Based Applications

Differentiated Protection Services with Failure Probability ...

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Asia communications and Photonics Conference and Exhibition(2010亚洲光纤通信与光弹博览会及研讨会 ACP 2010)

作者： Yaoquan Zhong Wei Guo Weiqiang Sun Yaohui Jin Weisheng Hu State Key Lab on Fiber-Optical Local Area Network and Advanced Optical Communication Systems Shanghai Jiao Tong University ShanghaiP.R.China 200240 China

ISBN: (纸本)9780819485571;0819485578

This paper introduces the concept of failure probability to measure the security level of communication tasks with different protection modes. Based on failure probability analysis, we develop three differentiated protection services provisioning strategies which can provide security level guarantee and network-resource optimization for workflow-based applications in optical grid.

关键词： differentiated protection services workflow-based application failure probability guarantee optical grid Legal Services server software web applications Differentiation differentiated batholith failure probability Heuristic algorithms Connections

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Formation of domain reversal by direct irradiation with femtosecond laser in lithium niobate

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Chinese optics Letters 2009年第2期7卷 169-172页

作者：朱海生陈险峰陈洪云邓学伟 Department of Physics the State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems Shanghai Jiao Tong University

We propose that domain inversion can be directly induced by femtosecond laser both theoretically and experimentally, which opens a path to achieve three-dimensional （3D） nonlinear crystal with a period in sub-micron-scale. A simulation of domain inversion is modeled by considering the temporal distribution of femtosecond pulses. The calculation results clarify that the domain inversions can happen within or after the interaction with the laser pulse, and the response time of domain inversion is in the picosecond level depending on the intensity and the materials. The domain reversal windows of lithium niobate by femtosecond laser are observed which agrees with theoretical predictions qualitatively.

关键词： Electromagnetic pulse Laser windows Lasers Lithium Niobium compounds Three dimensional Ultrashort pulses

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