张学如科研成果

基本信息 科学研究 教育教学 论文专著 新建主栏目 基本信息 名称 张学如，男，汉族，理学博士，教授，博士生导师；哈尔滨工业大学物理学院光电信息科学与工程系。 荣誉称号 名称 2005年 获哈尔滨工业大学华为奖 工作经历 名称 时间 工作经历 200704-今 哈尔滨工业大学物理学院，教授，博士生导师 200609-今 哈尔滨工业大学物理学院，教授 199907-200608 哈尔滨工业大学物理系，副研究员 199607-19907 哈尔滨工业大学物理系，助理研究员 教育经历 名称 1986年9月-1990年8月，就读于哈尔滨工业大学应用物理系，本科生，获学士学位 1990年9月-1993年2月，就读于哈尔滨工业大学应用物理系，硕士研究生，获硕士学位 1993年3月-1997年1月，就读于哈尔滨工业大学物理系，博士研究生，获理学博士学位 主要任职 名称 黑龙江省物理学会 理事 科研项目 项目名称 基于量子点复合调控的多参量光纤荧光传感研究 项目来源 国家自然科学基金面上项目 开始时间 2024-1-1 结束时间 2027-12-31 项目经费 53 担任角色 负责 项目类别 纵向项目 项目状态 进行中 简单介绍 项目名称 1.金属纳米膜中表面等离激元与光波的非线性相互作用研究 项目来源 国家自然科学基金 开始时间 2014-01-01 结束时间 2017-12-01 项目经费 81 担任角色 负责 项目类别 纵向项目 项目状态 完成 简单介绍 项目名称 折射率测试仪 项目来源 横向项目 开始时间 2012-08-01 结束时间 2015-08-01 项目经费 10 担任角色 负责 项目类别 横向项目 项目状态 完成 简单介绍 研究领域 名称 非线性光学 表面等离子亚波长光学 团队成员 名称 宋瑛林 王玉晓 张学如 讲授课程 名称 激光原理与技术简介: 本课程介绍激光的基本特性、基本工作原理、光与物质共振相互作用过程中的物理过程及特性、激光振荡、激光调制、调Q与锁模技术等基础知识，使学生对激光器的物理机理和相关激光技术有较深入的理解，掌握激光的基本理论、分析方法和重要结论，并使学生一定程度了解激光技术新进展和重大应用背景，为学生从事光电信息科学与工程工作打好专业基础。 非线性光学简介:本课程的教学内容包括非线性光学基本理论和非线性光学理论的应用，基本理论包括：经典的电磁场理论、非磁性介质中的波动方程、电极化率理论、非线性介质中的耦合波方程，激发态吸收与折射理论。理论应用包括：二次谐波及光混频、光学参量放大及振荡、受激布里渊和拉曼散射、相位共轭技术、光学双稳性、自聚焦、光孤子、非线性光学测量技术等。 招生信息 名称 每年招收1名博士生和1名硕士生。 论文期刊 论文标题 Enhancing temperature sensitivity of Er3%2B-Yb3%2Bdoped NaGd(MoO4)2 via particle spacing and crystallinity optimization. 作者 Yan Tianpeng, Li Zhenhua, Chen Shuang, Song Yinglin, Wang Yuxiao, Zhang Xueru. 发表时间 2023 期刊名称 CERAMICS INTERNATIONAL 期卷 49(21): 33681-33691 简单介绍 Upconversion nanoparticles have emerged as promising materials for non-contact temperature sensors due to their unique detection capabilities and low interference, so it is valuable to explore simple and effective approaches to enhance the temperature measurement sensitivity. In this study, we employed a special sol-gel method to prepare NaGd(MoO4)2 powder by calcining the precursor mixture, and the fluorescence properties as well as thermal sensitivity were investigated. Analysis based on XRD, SEM and energy transfer modes revealed that the enhancement in temperature sensitivity resulted from the increased distance between the sensitizer and activator ions as well as changes in crystallinity, compared with normal sol-gel method. By optimizing the doping of rare earth ions, the highest sensitivity reached 3.34 %K-1. Additionally, fluorescence spectra analysis of NaGd (MoO4)2 samples synthesized via different methods demonstrated that energy transfer between the sensitizer and activator ions can be achieved through high-temperature calcination. Moreover, LiGd(MoO4)2 samples prepared using the unique sol-gel method exhibited similar enhancements in temperature sensitivity as NaGd(MoO4)2 powder. These findings imply that the samples prepared through the unique sol-gel synthesis method exhibit significant potential in terms of their fluorescence and temperature detection capabilities. 论文标题 Excellent ultrafast broadband optical limiting of functionalized twistacenes based on two-photon absorption-induced excited state absorption. 作者 Han Yanbing, Xiao Jinchong, Wu Xingzhi, Wang Yuxiao , Zhang Xueru, Song Yinglin 发表时间 2023 期刊名称 Dyes and Pigments 期卷 208: 110842 简单介绍 Twistacene is an outstanding building block due to the large conjugated system. Herein, a series of twistacenes have been designed and synthesized with the assistant from a theoretical analysis based on the morphology of the natural transition orbitals of first excited state. These twistacenes exhibit two photon absorption and unique broadband excited singlet state absorption features, which is systematically confirmed by transient absorption spectra, two-photon excited fluorescence and z-scan experiments. The overlap of two-photon absorption band with excited state absorption band can improve the OL performance. The experimental results are consistent with theoretical prediction, which confirm the rationalization of molecular design strategy. The screened twistacene 5 exhibits excellent optical limiting behavior with extremely high transmittance and low threshold, where the threshold is 1.3-3.1 mJ/cm2 in a wide optical window from 532 nm to 900 nm in femtosecond regime and 69 mJ/cm2 in picosecond regime. The experimental results suggest twistacene is a promising candidate for nonlinear optical applications, especially for protection against ultrashort laser pulses. 论文标题 Tunable nonlinear absorption of gold nanostars and application as a saturable absorber 作者 Chen Shuang, Niu Ruipeng, Gao Yachen, Li Zhenhua, Liu Kun, Wang Yuxiao, Song Yinglin, Zhang Xueru 发表时间 2024 期刊名称 Optics and Laser Technology 期卷 168: 109873 简单介绍 Surface plasmon resonance (SPR) of metal nanostructures can significantly strengthen the light-matter interaction at the nanoscale. We investigate the plasmon characteristics and strong field enhancement near the sharp tips of gold nanostars and demonstrate surface-enhanced nonlinear absorption properties. Gold nanostars show saturable absorption (SA) under laser excitation at 700 nm and 750 nm, while reverse saturable absorption (RSA) is found in the range of 500 nm to 650 nm. The saturation intensity reaches the minimum value (0.4 MW/cm2) when the incident wavelength resonates to the SPR peak. In comparison with other plasmon nanostructures, gold nanostars have extraordinarily higher modulation depth up to 53%, which means that they have outstanding SA characteristic. Based on the theoretical calculation of the compressed Gaussian optical pulse width of gold nanostars, it was successfully applied to compress the pulse width of nanosecond laser pulses. 论文标题 Ultrafast nonlinear absorption with multiple transformations and transient dynamics of gold nanobipyramids 作者 Chen Shuang, Niu Ruipeng, Gao Yachen, Zhou Wenfa, Liu Kun, Wang Yuxiao, Song Yinglin, Zhang Xueru 发表时间 2022 期刊名称 Optics Express 期卷 30(26): 47485-47496 简单介绍 The process and condition of saturable absorption (SA) and reverse saturable absorption (RSA) of ultrafast nonlinear optics in metal nanoparticles are essential for applications including light generation, amplification, modulation, and switching. Here, we first discover and explore the multiple transformations (SA-RSA-SA) of ultrafast nonlinear absorption behavior of metal nanoparticles in femtosecond pulses. Correspondingly, the energy level model and fitting formula of multiple transformations are established to illustrate the process of optical response. The femtosecond transient absorption spectra provide information about their ultrafast dynamics process and vibrational mode, which further reveals the multiple transformation mechanisms of nonlinear absorption in gold nanobipyramids (Au-NBPs). Furthermore, Au-NBPs exhibit a significantly higher SA modulation depth up to 42% in the femtosecond, which is much higher than the reported values of other nanomaterials. Our results indicate that Au-NBPs can be used as broadband ultrafast Q-switching and mode-locking, and the conversion offers new opportunities for metal nanostructures in applications of optical switching. 论文标题 Analysis of focal-shift effect in planar metallic nanoslit lenses 作者 Yang Gao, Jianlong Liu, Xueru Zhang, Yuxiao Wang, Yinglin Song, Shutian Liu, Yan Zhang 发表时间 期刊名称 Optics Express 期卷 20(2) 简单介绍 A theoretical analysis based on scalar diffraction theory about the recently reported focal-shift phenomena in planar metallic nanoslit lenses is presented. Under Fresnel approximation, an axial intensity formula is obtained, which is used to analyze the focal performance in the far field zone of lens. The relative focal shift is totally dependent on the Fresnel number only. The influences of the lens size, preset focal length and incident wavelength can be attributed to the change of Fresnel number. The total phase difference of the lens is approximately equal to the Fresnel number multiplied by pi. Numerical simulations performed using finite-difference time-domain (FDTD) and near-far field transformation method are in agreement with the theoretical analysis. Using the theoretical formula assisted by simple numerical method, we provide predictions on the focal shift for the previous literatures. 论文标题 Metallic planar lens with binary nanoscale slits 作者 Yang Gao, Jianlong Liu, Xueru Zhang, Yuxiao Wang, Yinglin Song, Shutian Liu 发表时间 期刊名称 IEEE Photonics Technology Letter 期卷 24(11) 简单介绍 We propose a binary plasmonic lens based on metallic nanoslit array with different fillings. The phase range of pi is achieved by changing the refractive indices of the filling materials in the slits. These index-modulated slits are demonstrated to have unique advantages in phase delay compared with the width-modulated ones. The proposed binary structures can keep the advantage in phase modulation and reduce the difficulty in fabrication. Lenses with different functions, such as focusing light to one or two points or correcting oblique incident light, are designed by a simulated annealing algorithm and investigated by the finite-difference time-domain method. 论文标题 Slow surface plasmon polaritons with a large normalized delay bandwidth product in an ultracompact metal gap superlattice 作者 Chunlei Li, Xueru Zhang, Yuxiao Wang, Yinglin Song, Degui Kong, Yueke Wang 发表时间 期刊名称 Optics communications 期卷 285(7) 简单介绍 We propose a metal gap superlattice that can decrease the group velocity of surface plasmon polaritons (SPPs) with a large normalized delay bandwidth product (NDBP) and small high-order dispersion. The length of the superlattice is only 8.60 mu m and the transmission is 0.4. The multiple reflections of photons in the nanocavity result in slow SPP group velocity. The numerical analysis exploiting the transfer matrix method (TMM) is confirmed by the finite-difference time-domain (FDTD) numerical simulations. In addition, we also analyze the reason for pulse deformation. 论文标题 Single band upconversion mechanisms of Er3%2B/Yb3%2B:ZrO2 nanocrystals 作者 Lu Liu, Yuxiao Wang, Yunfeng Bai, Xueru Zhang, Kun Yang, Chuanhai Huang, Yinglin Song 发表时间 期刊名称 Optics communications 期卷 285(6) 简单介绍 We demonstrate single band upconversion spectra of Er3%2B and Yb3%2B codoped ZrO2 nanocrystals. Ratios of green to red emission in Er3%2B doped ZrO2 and red to green emission in Er3%2B/Yb3%2B codoped ZrO2 are 8 and 10, respectively. Rate equations for rare earth energy level populations are used to investigate the upconversion mechanisms on the basis of the upconversion intensity dependences of pump power. Excited state absorption and energy transfer are the dominant processes in Er3%2B doped and Er3%2B/Yb3%2B codoped ZrO2, respectively. 论文标题 Optical temperature sensor through infrared excited blue upconversion emission in Tm3%2B/Yb3%2B codoped Y2O3 作者 Dongyu Li, Yuxiao Wang, Xueru Zhang, Kun Yang, Lu Liu, Yinglin Song 发表时间 期刊名称 Optics communications 期卷 285(7) 简单介绍 An analysis of the intense blue upconversion emission at 476 and 488 nm in Tm3%2B/Yb3%2B codoped Y2O3 under excitation power density of 86.7 W/cm(2) available from a diode laser emitting at 976 nm, has been undertaken. Fluorescence intensity ratio (FIR) variation of temperature-sensitive blue upconversion emission at 476 and 488 nm in this material was recorded in the temperature range from 303 to 753 K. The maximum sensitivity derived from the FIR technique of the blue upconversion emission is approximately 0.0035 K-1. The results imply that Tm3%2B/Yb3%2B codoped Y2O3 is a potential candidate for the optical temperature sensor. 论文标题 Measurements of dynamics of nondegenerate optical nonlinearity in ZnS with pulses from optical parameter generation 作者 Min Shui, Zhongguo Li, Xiao Jin, Junyi Yang, Zhongguo Nie, Guang Shi, Xingzhi Wu, Kun Yang, Xueru Zhang, Yuxiao Wang, Yinglin S 发表时间 期刊名称 Optics communications 期卷 285(7) 简单介绍 We expand the degenerate PO pump-probe technique to nondegenerate field and use it to investigate optical nonlinear dynamics in ZnS single crystal. Excited by 532-nm laser pulses with 21-ps duration, the temporal response of nondegenerate nonlinear absorption and nondegenerate nonlinear refraction are probed by laser pulses from optical parameter generation (OPG) at 600 and 680 nm with pulse width of 10 ps. Based on the theory of free-carrier optical nonlinearity, we study the pure free-carrier refraction in ZnS. By numerically fitting based on the nondegenerate pump-probe theory, the nondegenerate two-photon absorption coefficient, the free-carrier lifetime, the free-carrier absorptive cross section and refractive coefficient at both probe wavelengths are determined respectively. The dispersion of the free-carrier refractive coefficients is discussed. 论文标题 Upconversion mechanisms and thermal effects of Er3%2B in Er3%2B doped yttria nanocrystals 作者 Liu, L; Wang, YX ; Zhang, XR; Yang, K ; Li, J ; Liu, G; Song, YL 发表时间 期刊名称 JOURNAL OF LUMINESCENCE 期卷 132(6):148 简单介绍 Efficient Er3%2B:Y2O3 phosphor is synthesized by the sol-gel method. Rate equations for Er3%2B energy level populations are used to investigate pump power and temperature dependences of upconversion intensity as well as the fluorescence decay profiles. Excited state absorption cross section of Er3%2B I-4(13/2) of 6.8 x 10(-27) m(2) and cross relaxation rate of 6200 s(-1) are determined from comparison between theoretical predictions and experimental data. In addition, it is found that effect of temperature on the phonon-assistant absorption cannot be neglected. This work provides references for the prediction of the upconversion behavior in Er3%2B singly doped matrix. 论文标题 Nonlinear absorption of CS2 at the wavelength of 400 nm with femtosecond pulses 作者 Kong, DG ; Chang, Q ; Gao, YC ; Ye, HA; Zhang, LX; Shi, G; Zhang, XR; Wang, YX; Yang, K; Song, YL 发表时间 期刊名称 PHYSICA B-CONDENSED MATTER 期卷 407(8) 简单介绍 Nonlinear absorption of carbon disulfide (CS2) was investigated by Z-scan technique and time-resolved pump-probe technique with femtosecond pulses at 400 nm wavelength. By the two techniques, we confirmed that the nonlinear absorption of CS2 arise from a combination of two-photon absorption (TPA) and the excited state absorption induced by TPA under the incident laser pulses with 400 nm wavelength. The coefficient of TPA, the absorption cross-section of low excited state and lifetime of low excited state were obtained by theoretical fitting the experimental results. The results indicated that the CS2 has good optical limiting capability at 400 nm wavelength. 论文标题 Enhanced upconversion fluorescence of Er3%2B:ZrO2 nanocrystals induced by phase transformation 作者 Liu, L; Chen, YJ; Zhang, XL; Wang, YX ; Zhang, XR; Song, YL 发表时间 期刊名称 AIP ADVANCES 期卷 2(1) 简单介绍 In this letter, we demonstrate for the first time a growth of monoclinic phase ZrO2 nanocrytals based on a sol-gel method, compared to the ordinary sol-gel procedure, our method decreases the synthesized temperature from similar to 1000 degrees C to similar to 800 degrees C. In addition, it is found that Er3%2B in monoclinic phase ZrO2 nanocrystals have greatly enhanced upconversion emissions under infrared LD excitation due to its lower environmental symmetry. 论文标题 Optical bistability of subwavelength metallic film coated by Kerr dielectric gratings 作者 Wang, JC; Wang, YK ; Zhang, XR ; Song, YL ; Liu, ST 发表时间 期刊名称 OPTIK 期卷 123(8) 简单介绍 We studied the optical bistability of subwavelength metallic film coated by Kerr dielectric gratings numerically. It is found that the effect of optical bistability in the structure is explained by the excitations of the coupled surface plasmon polaritons at the coated metallic films. The effect of thickness of the metallic films on bistability loop is analyzed in detail, and the authors attribute the change of the bistability loop to the lifetime of the coupled surface plasmon polaritons.