Author Affiliations
Abstract
College of Electronic Engineering, Heilongjiang University, Harbin 150080, China
Extraordinary optical transmission (EOT) in subwavelength metal structures has been studied widely. Herein, we propose a strategy for tuning the EOT of the bullseye structure. Specifically, the bullseye structure was immersed in a nonlinear medium, and a controlling light was employed to change the refractive index of the medium. At different intensities and distributions of controlling light, the transmission property of signal light in the bullseye structure was simulated. The results show that a variable transmission spectrum in the bullseye structure can be realized. Moreover, the position of the central transmission peak shifts linearly with the increasing intensity of controlling light.
230.3990 Micro-optical devices 130.6010 Sensors Chinese Optics Letters
2019, 17(12): 122302
黑龙江大学 电子工程学院, 黑龙江 哈尔滨 150080
利用水热法合成了三种不同尺寸的单核CdTe量子点和核壳CdTe/CdS量子点。应用Top-hat Z-scan技术在纳秒、皮秒、飞秒激光脉冲作用下研究了三种不同尺寸单核CdTe量子点的非线性吸收特性。实验结果表明: 在不同激光脉冲作用下三种不同尺寸的CdTe量子点的非线性吸收特性均表现为饱和吸收, 并且均呈现出随着量子点尺寸的减小, 其非线性吸收特性增大的趋势。为了进一步研究量子点尺寸的变化对非线性吸收特性的影响, 又在飞秒激光脉冲作用下研究了核壳CdTe/CdS量子点的非线性吸收特性; 随着包壳时间的增加, 壳层厚度增加, 量子点尺寸增加, 其非线性吸收特性呈减小趋势, 并且核壳CdTe/CdS量子点的非线性吸收特性明显优于单核CdTe量子点; 分析讨论了单核CdTe量子点与核壳CdTe/CdS量子点的非线性吸收特性和量子尺寸效应机制, 实验结果表明合成的量子点样品均具有良好的量子尺寸效应。
量子点 非线性吸收 Top-hat Z扫描 量子尺寸效应 quantum dots nonlinear absorption Top-hat Z-scan quantum size effect 红外与激光工程
2017, 46(12): 1206006
黑龙江大学电子工程学院，黑龙江 哈尔滨 150080
应用Z-扫描技术对比研究了萘酞菁铅和萘酞菁钯化合物在波长为532 nm纳秒激光脉冲作用下的三阶非线光学特性。实验结果表明，两种萘酞菁化合物均显现出较强的非线性吸收特性(反饱和吸收)和非线性折射特性(自聚焦)。理论拟合得出萘酞菁铅和萘酞菁钯的非线性吸收系数β分别为6.54×10-10 m/W和3.90×10-10 m/W；非线性折射系数率n2分别为1.68×10-10 esu和8.04×10-11 esu；二阶分子超极化率系数γ分别为3.44×10-28 esu和2.57×10-28 esu，CS2二阶分子超极化率系数为4.32×10-33 esu；两种萘酞菁化合物的二阶分子超极化率强于CS2近5个数量级。实验结果表明，萘酞菁铅化合物具有较强的非线性吸收和非线性折射特性，且大于萘酞菁钯化合物的光学非线性特性是由于萘酞菁铅化合物的重原子效应提高了其光学非线性特性。
三阶光学非线性 萘酞菁 重原子效应 third-order optical nonlinearity naphthalocyanine heavy atom effect
黑龙江大学电子工程学院, 黑龙江 哈尔滨 150080
利用飞秒激光直写加工平台，对飞秒激光脉冲与半导体硅材料相互作用进行了研究。在不同的激光功率和脉冲数作用下，通过定点辐照和扫描方式在硅表面进行微结构诱导。用扫描电子显微镜对表面诱导结构进行表征，实验发现激光功率和脉冲数影响诱导微结构的形貌和周期，并发现诱导得到的周期性条纹结构的取向与诱导激光的偏振方向有关，通过调整激光的偏振方向可以有效地控制结构的取向。通过扫描的方式，可以在硅材料表面制备排列规则的周期结构。依据实验结果，分析了脉冲数对周期性条纹结构周期变化的影响。研究结果为硅材料表面微结构加工提供了参考。
激光光学 飞秒激光 微结构 偏振 光学学报
2014, 34(s1): s114002
Author Affiliations
Abstract
The third-order optical nonlinearities of dimethyl sulfoxide (DMSO) are investigated using the optical Kerr effect (OKE) and Z-scan techniques with femtosecond pulses. We are able to fit the OKE signal theoretically by convolving the autocorrelation of the incident pulse intensity profile with the impulse responses of the samples, illustrating the instantaneous nonlinear response of DMSO. We verify that the purely electronic cloud distortion causes the observed signal for DMSO. The Z-scan technique is used to estimate the third-order susceptibility of DMSO, which is about a quarter of that for CS2 and mainly comes from the nonlinear refraction with an intensity of less than 140 GW/cm2.
160.4670 Optical materials 190.3270 Kerr effect Chinese Optics Letters
2012, 10(11): 111601
