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基于液晶-聚合物复合材料的电控调光器件研究进展 被引量:6
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作者 贺雅梅 靳晓宇 +3 位作者 黎梓铭 胡小文 李明 周国富 《液晶与显示》 CAS CSCD 北大核心 2022年第8期1052-1069,共18页
液晶是一种具有优良光学性能及外场响应特性的材料,在调光领域展现出巨大的发展潜力。近年来,随着建筑能耗的增长与人们环保意识的增强,能够对不同波段的太阳光线进行动态调控的液晶调光器件受到了人们的广泛关注。相较于传统的单一液... 液晶是一种具有优良光学性能及外场响应特性的材料,在调光领域展现出巨大的发展潜力。近年来,随着建筑能耗的增长与人们环保意识的增强,能够对不同波段的太阳光线进行动态调控的液晶调光器件受到了人们的广泛关注。相较于传统的单一液晶材料,液晶-聚合物的复合材料可以通过调节液晶与聚合物网络间的相互作用实现对入射光的动态调控,并通过调节液晶螺距的大小来精准调控入射光的波段,拓展了液晶材料的光电性能,是制作调光器件的理想材料。另外,基于电响应液晶材料的调光器件具有易于控制、效果稳定、响应快速等特点,能够满足人们的即时需求,得到了研究人员的广泛关注。本文主要对近年基于聚合物分散液晶、聚合物稳定液晶、聚合物稳定胆甾相液晶的电响应调光器件的研究进展进行了系统总结,并对其未来的发展趋势做出了展望。 展开更多
关键词 电控调光器件 聚合物分散液晶 聚合物稳定液晶 聚合物稳定胆甾相液晶
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OLYPASCH显微镜调光器件的剖析
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作者 陈书源 《医疗设备信息》 1994年第5期10-11,共2页
OLYPASCH显微镜调光器件的剖析福州总医院检验中心陈书源OLYPAS显微镜使用中常见故障,灯不亮或亮度不能调整,大部分情况是保险丝、卤素灯和变压器和调光器出了问题。保险丝、卤素何变压器比较容易检查。如果我们对调光... OLYPASCH显微镜调光器件的剖析福州总医院检验中心陈书源OLYPAS显微镜使用中常见故障,灯不亮或亮度不能调整,大部分情况是保险丝、卤素灯和变压器和调光器出了问题。保险丝、卤素何变压器比较容易检查。如果我们对调光器的内部结构有所认识,可对电路进行... 展开更多
关键词 医疗器械 显微镜 调光器件
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无源液晶光学器件的低成本驱动电路设计 被引量:2
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作者 陈梅蕊 杜莹 +5 位作者 毛红敏 彭建涛 孙会娟 徐国定 陆焕钧 曹召良 《液晶与显示》 CAS CSCD 北大核心 2022年第12期1572-1579,共8页
为了实现多路无源液晶光学器件的驱动,设计开发了低成本、低复杂度及幅频可调的多路驱动电路。首先,为了便于控制液晶器件,在PC机和驱动板之间采用USB数据传输方式进行控制信号的传输。其次,驱动板卡采用母板加多子板模式,每个子板可输... 为了实现多路无源液晶光学器件的驱动,设计开发了低成本、低复杂度及幅频可调的多路驱动电路。首先,为了便于控制液晶器件,在PC机和驱动板之间采用USB数据传输方式进行控制信号的传输。其次,驱动板卡采用母板加多子板模式,每个子板可输出32路驱动信号,其可依据实际需求灵活选取子板数目,从而降低成本。母板与子板均采用STM32作为主控芯片,子板通过SPI接口与母板进行数据传输。每个子板通过2个SPI接口将数据分组分发给DAC芯片,每个DAC芯片可控制16路数模转换,最终实现192路模拟信号的输出。最后,进行制板和测试。结果显示,输出模拟电压与灰度值符合线性比例关系,其绝对误差在0.010 V左右,符合10 bit、1024级电压灰度值调制精度。该驱动板卡可以实现多路驱动信号的输出,满足多路无源液晶光学器件驱动控制的需求。 展开更多
关键词 无源液晶调光器件 驱动电路 低成本 精度
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Butt-Joint Monolithically Integrated DFB-LD/EA-MD Light Source for 10Gbit/s Transmission
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作者 李宝霞 胡小华 +4 位作者 朱洪亮 王保军 边静 赵玲娟 王圩 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2005年第6期1100-1103,共4页
This paper reports on the design,fabrication,and performance of an integrated electro-absorptive modulated laser based on butt-joint configuration for 10Gbit/s application.This paper mainly aims at two aspects.One is ... This paper reports on the design,fabrication,and performance of an integrated electro-absorptive modulated laser based on butt-joint configuration for 10Gbit/s application.This paper mainly aims at two aspects.One is to improve the optical coupling between the laser and modulator;another is to increase the bandwidth of such devices by reducing the capacitance parameter of the modulator.The integrated devices exhibit high static and dynamic characteristics. Typical threshold current is 15mA,with some value as low as 8mA.Output power at 100mA is more than 10mW.The extinction characteristics,modulation bandwidth,and electrical return loss are measured.3dB bandwidth more than 10GHz is monitored. 展开更多
关键词 integrated optoelectronic device electro-absorptive modulator distributed-feedback lasers butt-joint 3dB-bandwidth
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Modulation instability of dispersion-shifted fiber couplers 被引量:1
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作者 ZHOU Yan-yong JIA Wei-guo +2 位作者 HAN Ying-ming YING Chun BAO Hong-mei 《Optoelectronics Letters》 EI 2008年第4期264-268,共5页
The nonlinear coupled-mode equations are rewritten by even and odd modes.We study modulation instability(MI) of dispersion-shifted fiber couplers when either even or odd mode is launched alone by using zero-dispersion... The nonlinear coupled-mode equations are rewritten by even and odd modes.We study modulation instability(MI) of dispersion-shifted fiber couplers when either even or odd mode is launched alone by using zero-dispersion wavelength relatively long(quasi-cw) pulses.The result shows that there are new types of MI in both the normal-dispersion and the anomalous-dispersion regimes.MI is concerned with forth-order dispersion and has no relation with third-order dispersion.Quasi-cw can be changed into pulses array under certain conditions.We can extract super short pulse from this.Furthermore,the bandwidth of gain spectra widens and its strength accretes as the input power increases. 展开更多
关键词 纤耦合器 非线性耦合方程 制不稳定性 器件
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Bandgap-tunable lateral and vertical heterostructures based on monolayer Mo1-xWxS2 alloys 被引量:3
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作者 Yu Kobayashi Shohei Mori +1 位作者 Yutaka Maniwa Yasumitsu Miyata 《Nano Research》 SCIE EI CAS CSCD 2015年第10期3261-3271,共11页
The fabrication of heterostructures of two-dimensional semiconductors with specific bandgaps is an important approach to realizing the full potential of these materials in electronic and optoelectronic devices. Severa... The fabrication of heterostructures of two-dimensional semiconductors with specific bandgaps is an important approach to realizing the full potential of these materials in electronic and optoelectronic devices. Several groups have recently reported the direct growth of lateral and vertical heterostructures based on monolayers of typical semiconducting transition metal dichalcogenides (TMDCs) such as WSe2, MoSe2, WS2, and MoS2. Here, we demonstrate the single-step direct growth of lateral and vertical heterostructures based on bandgap-tunable Mo1-xWxS2 alloy monolayers by the sulfurization of patterned thin films of WO3 and MoO3. These patterned films are capable of generating a wide variety of concentration gradients by the diffusion of transition metals during the crystal growth phase. Under high temperatures, this leads to the formation of monolayer crystals of Mo1-xWxS2 alloys with various compositions and bandgaps, depending on the positions of the crystals on the substrates. Heterostructures of these alloys are obtained through stepwise changes in the ratio of W/Mo within a single domain during low-temperature growth. The stabilization of the monolayer Mo1-xWxS2 alloys, which often degrade even under gentle conditions, was accomplished by coating the alloys with other monolayers. The present findings demonstrate an efficient means of both studying and optimizing the optical and electrical properties of TMDC-based heterostructures to allow use of the materials in future device applications. 展开更多
关键词 transition metaldichalcogenide Mo1-xWxS2 alloy HETEROSTRUCTURE thin-film sulfurization photoluminescence stability
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Specially shaped Bessel-like self-accelerating beams along predesigned trajectories 被引量:4
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作者 Juanying Zhao I.D.Chremmos +5 位作者 Ze Zhang Yi Hu Daohong Song Peng Zhang N.K.Efremidis Zhigang Chen 《Science Bulletin》 SCIE EI CAS CSCD 2015年第13期1157-1169,共13页
Over the past several years, spatially shaped self-accelerating beams along different trajectories have been studied extensively. Due to their useful properties such as resistance to diffraction, self-healing, and sel... Over the past several years, spatially shaped self-accelerating beams along different trajectories have been studied extensively. Due to their useful properties such as resistance to diffraction, self-healing, and selfbending even in free space, these beams have attracted great attention with many proposed applications. Interestingly, some of these beams could be designed with controllable spatial profiles and thus propagate along various desired trajectories such as parabolic, snake-like, hyperbolic, hyperbolic secant, three-dimensional spiraling, and even self-propelling trajectories. Experimentally, suchbeams are realized typically by using a spatial light modulator so as to imprint a desired phase distribution on a Gaussian-like input wave front propagating under paraxial or nonparaxial conditions. In this paper, we provide a brief overview of our recent work on specially shaped self-accelerating beams, including Bessel-like, breathing Bessellike, and vortex Bessel-like beams. In addition, we propose and demonstrate a new type of dynamical Bessel-like beams that can exhibit not only self-accelerating but also self-propelling during propagation. Both theoretical and experimental results are presented along with a brief discussion of potential applications. 展开更多
关键词 Airy beams . Bessel beams . Vortexbeams - Nondiffracting beams . Self-acceleratingSelf-healing
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Integrating lattice and gap plasmonic modes to construct dual-mode metasurfaces for enhancing light–matter interaction 被引量:2
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作者 Limin Lin Jiancai Xue +5 位作者 Haofei Xu Qian Zhao Wenbo Zhang Yaqin Zheng Lin Wu Zhang-Kai Zhou 《Science China Materials》 SCIE EI CAS CSCD 2021年第12期3007-3016,共10页
Photonic structures with optical resonances beyond a single controllable mode are strongly desired for enhancing light±matter interactions and bringing about advanced photonic devices. However, the realization of... Photonic structures with optical resonances beyond a single controllable mode are strongly desired for enhancing light±matter interactions and bringing about advanced photonic devices. However, the realization of effective multimodal photonic structures has been restricted by the limited tunable range of mode manipulation, the spatial dispersions of electric fields or the polarization-dependent excitations. To overcome these limitations, we create a dualmode metasurface by integrating the plasmonic surface lattice resonance and the gap plasmonic modes;this metasurface offers a widely tunable spectral range, good overlap in the spatial distribution of electric fields, and polarization independence of excitation light. To show that such dual-mode metasurfaces are versatile platforms for enhancing light±matter interactions, we experimentally demonstrate a significant enhancement of second-harmonic generation using our design, with a conversion efficiency of 1±3 orders of magnitude larger than those previously obtained in plasmonic systems. These results may inspire new designs for functional multimodal photonic structures. 展开更多
关键词 dual-mode metasurfaces gap plasmon surface lattice resonance independently dual-mode manipulation enhancement of light–matter interaction
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Blue top-emitting organic light-emitting devices using Alq_3 as phase shift adjustment layer 被引量:1
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作者 孟彦龙 谢文法 +4 位作者 谢国华 吴丰民 赵毅 侯晶莹 刘式墉 《Optoelectronics Letters》 EI 2011年第2期126-128,共3页
Blue top-emitting organic light-emitting devices (TEOLEDs) are demonstrated by employing Alq3 as phase shift adjustment layer (PSAL) to increase the phase shift on reflection of the top electrode within a range, w... Blue top-emitting organic light-emitting devices (TEOLEDs) are demonstrated by employing Alq3 as phase shift adjustment layer (PSAL) to increase the phase shift on reflection of the top electrode within a range, which also improves the light out-coupling. By adjusting the thickness of P SAL, the CIEx,y of devices, which utilize 2, 7-Di-pyrenyl-9, 9-spiro-bifluorene (DPSF) as emitting layer, changes from (0.16, 0.50) to (0.18, 0.37). The maximnum current efficiency of 7.1 cd/A is acquired under 4.5 V with an increasing luminance of 139 cd/m^2. Compared with adjusting the total thickness of organic layer, it is more beneficial for achieving blue TEOLEDs with high efficiency. 展开更多
关键词 Current density Light emission Phase shift
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Advances and New Applications Using the Acousto-Optic Effect in Optical Fibers
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作者 Alexandre A. P. POHL Roberson A. OLIVEIRA +5 位作者 Ricardo E. DA SILVA Carlos A. F. MARQUES Paulo de Tarso NEVES JR. Kevin COOK John CANNING Rogério N. NOGUEIRA3 《Photonic Sensors》 SCIE EI CAS 2013年第1期1-25,共25页
This work presents a short review of the current research on the acousto-optic mechanism applied to optical fibers. The role of the piezoelectric element and the acousto-optic modulator in the excitation of flexural a... This work presents a short review of the current research on the acousto-optic mechanism applied to optical fibers. The role of the piezoelectric element and the acousto-optic modulator in the excitation of flexural and longitudinal acoustic modes in the frequency range up to 1.2 MHz is highlighted. A combination of the finite elements and the transfer matrix methods is used to simulate the interaction of the waves with Bragg and long period gratings. Results show a very good agreement with experimental data. Recent applications such as the writing of gratings under the acoustic excitation and a novel viscometer sensor based on the acousto-optic mechanism are discussed. 展开更多
关键词 ACOUSTO-OPTICS fiber gratings optical fibers optical sensors
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