張學如，男，漢族，理學博士，教授，博士生導師；哈爾濱工業大學理學院物理系。
基本介紹
- 中文名：張學如
- 民族：漢族
- 學位/學歷：博士
- 主要成就：獲哈爾濱工業大學華為獎
- 性別：男
- 職稱：教授
榮譽稱號,工作經歷,教育經歷,主要任職,論文期刊,
榮譽稱號
2005年 獲哈爾濱工業大學華為獎
工作經歷
| 時間 | 工作經歷 |
|---|---|
200704-今 | 哈爾濱工業大學物理系，教授，博士生導師 |
200609-今 | 哈爾濱工業大學物理系，教授 |
199907-200608 | 哈爾濱工業大學物理系，副研究員 |
200209-200309 | 德國亞琛工業大學訪問 |
教育經歷
- 1986年9月-1990年8月，就讀於哈爾濱工業大學套用物理系，本科生，獲學士學位
- 1990年9月-1993年2月，就讀於哈爾濱工業大學套用物理系，碩士研究生，獲碩士學位
- 1993年3月-1997年1月，就讀於哈爾濱工業大學物理系，博士研究生，獲理學博士學位
主要任職
黑龍江省物理學會 理事
論文期刊
| Analysis of focal-shift effect in planar metallic nanoslit lenses | |
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作者： | Yang Gao, Jianlong Liu, Xueru Zhang, Yuxiao Wang, Yinglin Song, Shutian Liu, Yan Zhang |
發表時間： | 2012-01-01 |
期刊名稱： | Optics Express |
期卷： | 20(2) |
簡單介紹： | 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. |
| Metallic planar lens with binary nanoscale slits | |
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作者： | Yang Gao, Jianlong Liu, Xueru Zhang, Yuxiao Wang, Yinglin Song, Shutian Liu |
發表時間： | 2012-06-01 |
期刊名稱： | IEEE Photonics Technology Letter |
期卷： | 24(11) |
簡單介紹： | 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. |
| Slow surface plasmon polaritons with a large normalized delay bandwidth product in an ultracompact metal gap superlattice | |
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作者： | Chunlei Li, Xueru Zhang, Yuxiao Wang, Yinglin Song, Degui Kong, Yueke Wang |
發表時間： | 2012-04-01 |
期刊名稱： | Optics communications |
期卷： | 285(7) |
簡單介紹： | 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. |
| Single band upconversion mechanisms of Er3+/Yb3+:ZrO2 nanocrystals | |
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作者： | Lu Liu, Yuxiao Wang, Yunfeng Bai, Xueru Zhang, Kun Yang, Chuanhai Huang, Yinglin Song |
發表時間： | 2012-03-01 |
期刊名稱： | Optics communications |
期卷： | 285(6) |
簡單介紹： | We demonstrate single band upconversion spectra of Er3+ and Yb3+ codoped ZrO2 nanocrystals. Ratios of green to red emission in Er3+ doped ZrO2 and red to green emission in Er3+/Yb3+ 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+ doped and Er3+/Yb3+ codoped ZrO2, respectively. |
| Optical temperature sensor through infrared excited blue upconversion emission in Tm3+/Yb3+ codoped Y2O3 | |
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作者： | Dongyu Li, Yuxiao Wang, Xueru Zhang, Kun Yang, Lu Liu, Yinglin Song |
發表時間： | 2012-04-01 |
期刊名稱： | Optics communications |
期卷： | 285(7) |
簡單介紹： | An analysis of the intense blue upconversion emission at 476 and 488 nm in Tm3+/Yb3+ 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+/Yb3+ codoped Y2O3 is a potential candidate for the optical temperature sensor. |
| Measurements of dynamics of nondegenerate optical nonlinearity in ZnS with pulses from optical parameter generation | |
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作者： | Min Shui, Zhongguo Li, Xiao Jin, Junyi Yang, Zhongguo Nie, Guang Shi, Xingzhi Wu, Kun Yang, Xueru Zhang, Yuxiao Wang, Yinglin S |
發表時間： | 2012-04-01 |
期刊名稱： | Optics communications |
期卷： | 285(7) |
簡單介紹： | 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. |
| Upconversion mechanisms and thermal effects of Er3+ in Er3+ doped yttria nanocrystals | |
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作者： | Liu, L; Wang, YX ; Zhang, XR; Yang, K ; Li, J ; Liu, G; Song, YL |
發表時間： | 2012-06-01 |
期刊名稱： | JOURNAL OF LUMINESCENCE |
期卷： | 132(6):148 |
簡單介紹： | Efficient Er3+:Y2O3 phosphor is synthesized by the sol-gel method. Rate equations for Er3+ 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+ 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+ singly doped matrix. |
| Nonlinear absorption of CS2 at the wavelength of 400 nm with femtosecond pulses | |
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作者： | Kong, DG ; Chang, Q ; Gao, YC ; Ye, HA; Zhang, LX; Shi, G; Zhang, XR; Wang, YX; Yang, K; Song, YL |
發表時間： | 2012-04-01 |
期刊名稱： | PHYSICA B-CONDENSED MATTER |
期卷： | 407(8) |
簡單介紹： | 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. |
| Enhanced upconversion fluorescence of Er3+:ZrO2 nanocrystals induced by phase transformation | |
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作者： | Liu, L; Chen, YJ; Zhang, XL; Wang, YX ; Zhang, XR; Song, YL |
發表時間： | 2012-03-01 |
期刊名稱： | AIP ADVANCES |
期卷： | 2(1) |
簡單介紹： | 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+ in monoclinic phase ZrO2 nanocrystals have greatly enhanced upconversion emissions under infrared LD excitation due to its lower environmental symmetry. |
| Optical bistability of subwavelength metallic film coated by Kerr dielectric gratings | |
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作者： | Wang, JC; Wang, YK ; Zhang, XR ; Song, YL ; Liu, ST |
發表時間： | 2012-08-01 |
期刊名稱： | OPTIK |
期卷： | 123(8) |
簡單介紹： | 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. |
