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Quantum dot lasing from a waterproof and stretchable polymer film

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Light(Science & Applications) 2022年第10期11卷 2435-2443页

作者： Mohammad Mohammadimasoudi Pieter Geiregat Frederik Van Acker Jeroen Beeckman Zeger Hens Tangi Aubert Kristiaan Neyts nano-bio-photonics lab Faculty of New Sciences and TechnologiesUniversity of TehranTehranIran Liquid Crystals and photonics Group ELIS DepartmentGhent UniversityTechnologiepark-Zwijnaarde 1269052 ZwijnaardeBelgium Physics and Chemistry of nanostructures Department of ChemistryGhent UniversityGhentBelgium Center for nano-and biophotonics(NB-photonics) Ghent UniversityTechnologiepark-Zwijnaarde 1269052 ZwijnaardeBelgium

Colloidal quantum dots(QDs)are excellent optical gain materials that combine high material gain,a strong absorption of pump light,stability under strong light exposure and a suitability for solution-based *** integration of QDs in laser cavities that fully exploit the potential of these emerging optical materials remains,however,a *** this work,we report on a vertical cavity surface emitting laser,which consists of a thin film of QDs embedded between two layers of polymerized chiral liquid *** directed,circularly polarized defect mode lasing under nanosecond-pulsed excitation is demonstrated within the photonic band gap of the chiral liquid *** and long-term narrow-linewidth lasing of an exfoliated free-standing,flexible film under water is obtained at room ***,we show that the lasing wavelength of this flexible cavity shifts under influence of pressure,strain or *** such,the combination of solution processable and stable inorganic QDs with high chiral liquid crystal reflectivity and effective polymer encapsulation leads to a flexible device with long operational lifetime,that can be immersed in different protic solvents to act as a sensor.

关键词： lasing film polymer

Effects of Pumping Sizes on THz Radiation Based on Ultrashort Light Pulse Optical Rectification for High Spatial Resolution T-Ray Imaging

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Chinese Physics Letters 2008年第12期25卷 4262-4265页

作者：徐世祥戴小明杨晓华李景镇 State Key laboratory of Precision Spectroscopy and Department of Physics East China Normal University Shanghai 200062 Shenzhen Key lab of Micro-nano photonics Department Shenzhen University Shenzhen 518060

We present our experimental studies on the effects of the pumping sizes on THz radiation based on ultrashort light pulse optical rectification for high spatial resolution T-Ray imaging. Our experiments show that high spatial resolution T-ray imaging requires both thin THz emitter and sample, and rigorous tolerance of the gap between the sample and the emitter, as well as small pumping size which usually much smaller compared with THz wavelength. Such a small pumping size results in dramatic decrease of the THz wave power, which originates from strong diffraction of THz wave, the depolarization of the focused tightly pumping beam, the spatial filtering of the emitter exit-surface, and the strong phase-mismatching between the pumping and the high spatial Fourier components of the THz signal, rather than two-photon absorption.

关键词： field emission molybdenum dioxide enhancement factor

Highly Directional Emission from a Subwavelength Slit in Metal-Dielectric Layered Films

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Chinese Physics Letters 2006年第5期23卷 1207-1210页

作者：李祖斌田建国周文远刘智波臧维平张春平 The MOE Key lab of Advanced Technique & Fabrication for Weak-Light Nonlinear photonics Materials and Tianjin Key Lab of Photonics Materials & Technology for Information Science Nankai University Tianjin 300457

The directional light emission from a single subwavelength slit surrounded by periodic grooves in layered films consisting of Ag and transparent dielectric is analysed numerically by the finite difference time domain method. The results show that the transmission through this structure is strongly confined by the modulation of the dielectric film with grooves on the output side. The role of evanescent waves in this phenomenon is discussed. It is the re-diffraction of the evanescent waves （that are generated by the diffraction of the subwavelength slit） caused by the grooves on the dielectric film that leads to the directional transmission. Some suggestions are given to obtain beaming light with high transmittance.

关键词： ENHANCED MICROWAVE TRANSMISSION APERTURE RADIATION LIGHT

Modeling of All-Optical Even and Odd Parity Generator Circuits Using Metal-Insulator-Metal Plasmonic Waveguides

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Photonic Sensors 2017年第2期7卷 182-192页

作者： Lokendra SINGH Amna BEDI Santosh KUMAR photonics lab Department of Electronics and Communication Engineering DIT University Dehradun-248009 India

Plasmonic metal-insulator-metal （MIM） waveguides sustain excellent property of confining the surface plasmons up to a deep subwavelength scale. In this paper, linear and S-shaped MIM waveguides are cascaded together to design the model of Mach-Zehnder interferometer （MZI）. Nonlinear material has been used for switching of light across its output ports. The structures of even and odd parity generators are projected by cascading the MZIs. Parity generator and checker circuit are used for error correction and detection in an optical communication system. Study and analysis of proposed designs are carried out by using the MATlab simulation and finite-difference- time-domain （FDTD） method.

关键词： Plasmonics MIM waveguides Mach-Zehnder interferometer nonlinear process FDTD method

A Distributed Fibre Bragg Grating Sensor Interrogator Employing a Reformative Arrayed Waveguide Grating

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Chinese Physics Letters 2008年第4期25卷 1329-1332页

作者：黄景堂黄旭光赵华伟 lab of photonics Information Technology South China Normal University Cuangzhou 510006

We present an interrogating technique employing a reformative arrayed waveguide grating without output waveguides in combination with a linear charge coupled device. A simple and effective data processing method called area equalized point is used to improve the system resolution. The simulation results show that the wavelength shift of a fibre Bragg grating with temperature can be precisely measured by this interrogation technique. The temperature accuracy and wavelength resolution of the sensor system are smaller than 0.08℃ and 0.8pm, respectively. If the FBG 3dB-bandwidth is 0.2nm with the wavelength spacing between two adjacent FBGs of 1.4 nm, the temperature and wavelength errors caused by crosstalk are respectively 0.01℃ and 0. 1 pm.

关键词： supernova explosion proto-neutron star shock wave

Towards converged, collaborative and co-automatic (3C) optical networks

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Science China(Information Sciences) 2018年第12期61卷 34-52页

作者： Yuefeng JI Jiawei ZHANG Xin WANG Hao YU State Key lab of Information photonics and Optical Communications Beijing University of Posts and Telecommunications (BUPT)

The interconnection of all things is developing a new diagram of future information ***, it is difficult to realize future applications with only one single technique. Collaboration between multiple advanced techniques is leading the way for the development of future information networks. Optical communication is an enabling technique to achieve high speed, long reach, and low latency communication,which plays an important role on the transformation of information networks. To achieve these advantages that caters to the characteristics of future information networks, collaboration of multiple advanced techniques with optical, which is called "optical plus X", could realize the vision of "all things connected with networks". In this paper, we focus on the collaboration between optical networks with other techniques,mainly discuss four representative aspects, which are "optical plus IP", "optical plus radio", "optical plus computing", and "optical plus AI". We discuss the challenges, timely works, and developing trends. Finally,we give the future visions for optical network towards a collaborative, converged and co-automatic optical network.

关键词： 5G optical transport networks edge computing optical networks IP over optical networks AI-assisted optical networks 3C optical networks

5G Flexible Optical Transport Networks with Large-Capacity, Low-Latency and High-Efficiency

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China Communications 2019年第5期16卷 19-32页

作者： Yuefeng Ji Jiawei Zhang Yuming Xiao Zhen Liu State Key lab of Information photonics and Optical Communications Beijing University of Posts and Telecommunications

The fifth generation(5G) of mobile communications are facing big challenges, due to the proliferation of diversified terminals and unprecedented services such as internet of things(IoT), high-definition videos, virtual/augmented reality(VR/AR). To accommodate massive connections and astonish mobile traffic, an efficient 5G transport network is required. Optical transport network has been demonstrated to play an important role for carrying 5G radio signals. This paper focuses on the future challenges, recent studies and potential solutions for the 5G flexible optical transport networks with the performances on large-capacity, low-latency and high-efficiency. In addition, we discuss the technology development trends of the 5G transport networks in terms of the optical device, optical transport system, optical switching, and optical networking. Finally, we conclude the paper with the improvement of network intelligence enabled by these technologies to deterministic content delivery over 5G optical transport networks.

关键词： 5G optical transport networks optical devices optical transport system optical switching optical networking

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Noncolinear Second-Harmonic Generation Pairs and Their Scatterings in Nd3+:SBN Crystals with Needle-Like Ferroelectric Domains

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Chinese Physics Letters 2018年第3期35卷 35-38页

作者：冯天闰康慧珍冯蕾杨嘉张天浩宋峰许京军田建国 L.I.Ivleva photonics Research Center School of PhysicsThe MOE Key Lab of Weak-Light Nonlinear Photonicsand Tianjin Key Lab of Photonics Materials and Technology for Information ScienceNankai UniversityTianjin 300071 Basic Department of Military Transportation College Tianjin 300161 Institute for General Physics of the Russian Academy of Science Moscow 119991Russia

Second-harmonic generation in Nd3＋：SBN crystal with needle-like ferroelectric with aperiodic domain structures is investigated. Two pairs of second harmonic （SH） waves appearing in lines are observed in unpoled Nd3＋：SBN crystals with aperiodic needle-like domains. A pair of SH waves emit from the exit face, whose intensities are angle-dependent. The angular dependence is corresponding to the spatial frequency spectrum of the aperiodic domain structure. Another pair of SH waves emit from both the side surfaces, which are mainly the scattered SH waves by needle-like domain walls and obey the theory of Rayleigh scattering.

关键词： SBN Crystals with Needle-Like Ferroelectric Domains SH QPM SHG

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A quasi-vector finite difference mode solver for optical waveguides with step-index profiles

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Chinese Optics Letters 2006年第5期4卷 285-288页

作者：肖金标张明德孙小菡 lab of photonics and Optical Communications Department of Electronic EngineeringSoutheast UniversityNanjing 210096

A finite difference scheme based on the polynomial interpolation is constructed to solve the quasi-vector equations for optical waveguides with step-index profiles. The discontinuities of the normal components of the electric field across abrupt dielectric interfaces are taken into account. The numerical results include the polarization effects, but the memory requirement is the same as in solving the scalar wave equation. Moreover, the proposed finite difference scheme can be applied to both uniform and non-uniform mesh grids. The modal propagation constants and field distributions for a buried rectangular waveguide and a rib waveguide are presented. Solutions are compared favorably with those obtained by the numerical approaches published earlier.

关键词： Electric fields Finite difference method Interpolation Numerical analysis Rectangular waveguides Vectors

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