双氮杂桥C60衍生物的合成及非线性光学性质

为了研究一种新型双氮杂桥C60衍生物的非线性光学特性,利用z扫描和光限幅实验分别研究了该化合物在532nm、脉宽8ns条件下的非线性光学和光限幅特性,并进行了理论分析和实验验证。结果表明,该化合物有较强的非线性吸收和非线性折射,非线性吸收系数=1.9210-10m/W,3阶非线性系数（3）=6.3410-12esu;化合物有较低的光限幅箝位值。该化合物是一种非常有前途的非线性光学材料。     

山梨酸酯类C60衍生物的合成及非线性光学性质

为了更深入地探讨C60衍生物的非线性光学性质,用5-(2-硫甲基-4-甲基)-嘧啶基-戊二炔-1-醇山梨酸酯与富勒烯C60进行加成反应,获得了一种新型的山梨酸酯类C60衍生物,用MALDI-TOF-MS,IR,UV-vis,1H NMR,DEPT和13CNMR进行了结构表征。利用Q倍频ns/ps Nd:YAG激光脉冲以及z扫描技术和光限辐实验研究了该化合物的非线性折射和光限辐特性,并获得了3阶非线性光学系数和非线性吸收系数。结果表明,C60衍生物有很强的非线性吸收和非线性折射,并具有较低的光限幅箝位值,是一种非常有前途的非线性光学材料。     

活性炭及炭载铂纳米粒子光限幅特性

利用光限幅实验,研究了纯活性炭纳米粒子和炭载铂纳米粒子水溶液的非线性吸收特性,发现活性炭纳米粒子具有反饱和吸收到饱和吸收的特性,Pt纳米粒子对炭载铂纳米粒子体系具有表面等离子局域增强效应。     

两种无机巢形金属团簇的非线性吸收及光限幅特性研究

用 5 32nm ,8ns激光脉冲系统研究了两种巢形金属团簇非线性吸收和光限幅特性。Z 扫描和光限幅的实验结果表明 ,团簇的非线性吸收和光限幅特性强烈依赖于重金属原子。根据有效激发态吸收理论分析了光限幅机理     

C60聚氨酯胺薄膜的非线性光学特性的研究

利用Z扫描技术,分别测量了五种C60聚氨酯胺薄膜(C60含量分别为0％、0．16％、0．30％、 0．42％、0．52％,厚度均为0．3 mm)的非线性光学吸收系数和折射系数,并研究了该薄膜的光限幅特性。实验表明:随着样品中C60的含量由0增加到0．52％,薄膜的透射率可由70％逐渐减小到10％,且透射光功率可限制在25 mJ／cm2以下。薄膜的透射率或透射功率可以随C60含量不同而改变,即薄膜的光限幅性能可以通过调节C60含量的方式加以控制。最后,基于C60分子的五能级模型,采用激发态吸收(反饱和吸收)物理机理解释了薄膜的非线性光学特性及光限幅性能。     

C60聚氨酯胺薄膜的非线性光学特性的研究

利用Z扫描技术，分别测量了五种C60聚氨酯胺薄膜（C60含量分别为0％、0．16％、0．30％、0．42％、0．52％，厚度均为0．3mm）的非线性光学吸收系数和折射系数，并研究了该薄膜的光限幅特性。实验表明：随着样品中C60的含量由0增加到0．52％，薄膜的透射率可由70％逐渐减小到10％，且透射光功率可限制在25mJ／cm^2以下。薄膜的透射率或透射功率可以随C60含量不同而改变，即薄膜的光限幅性能可以通过调节C60含量的方式加以控制。最后，基于C60分子的五能级模型，采用激发态吸收（反饱和吸收）物理机理解释了薄膜的非线性光学特性及光限幅性能。     

新型二维材料碳化钛纳米片光限幅特性研究

作为一类新型二维纳米材料,金属碳/氮化物纳米片（MXene）具有高的比表面积和电导率,以及组分、层数与厚度灵活可控的优点,在储能、催化、传感和光学等领域具有潜在应用价值。研究了一种MXene材料碳化钛（Ti3C2TX）纳米片分散液的非线性光学效应及其响应机制。发现Ti3C2TX纳米片分散液在532、1 064 nm纳秒脉冲激光作用下表现出优异的光限幅性能,其限幅阈值分别为0.14 J/cm2和0.12 J/cm2;通过测量非线性散射光强度随入射光功率密度的依赖关系,发现该材料光限幅响应机制主要起源于非线性光学散射效应。与传统的光限幅材料C60比较,该材料具有光限幅阈值低、响应波长范围宽等优点。     

CS2宽带光限幅和非线性吸收特性研究

利用ns脉冲激光,研究了CS2在420-470nm波长范围内的非线性吸收和光限幅特性。实验结果表明,CS2对420-450nm波长的脉冲激光具有大的非线性吸收和优良的光限幅性能,随着波长的增加,其非线性吸收和光限幅性能逐渐减小;CS2良好的宽带光限幅性能源于其大的非线性吸收,其非线性吸收机制为双光子吸收（TPA）以及由TPA诱导的激发态吸收（ESA）。     

半导体纳米粒子Bi2S3和NiS的非线性吸收特性

测量了两种纳米粒子Bi2S3和NiS的光限幅特性和非线性光学响应,测量了非线性吸收特性,数值模拟计算了Bi2S3的非线性吸收系数β≈9cm/GW,NiS非线性吸收系数β≈8cm/GW.     

半导体纳米粒子Bi2S3和NiS的非线性吸收特性

测量了两种纳米粒子Bi2S3和NiS的光限幅特性和非线性光学响应，测量了非线性吸收特性，数值模拟计算了Bi2S3的非线性吸收系数β≈9cm/GW, NiS非线性吸收系数β≈8cm/GW.     

Optical properties of dyes with/without metal nanoparticles doped in a highly ordered nanostructure

Highly ordered nanocomposite arrays of Rh6G-Au-AAO are formed by filling anodized aluminum oxide (AAO) with Rhodamine 6G (Rh6G) and gold nanoparticles. The optical properties of Rh6G-Au-AAO are studied by visible absorptive and fluorescent spectroscopy. Compared with the fluorescence spectra of Rh6G-Au in the solution environment, the fluorescence peak intensities of Rh6G-Au-AAO are significantly enhanced, the maximum enhancement rate is 5.5, and a constant blue shift of ∼12 nm of peak positions is presented. The effects come from the spatial confinement of AAO and the inhibition of the fluorescence quenching effect induced by gold nanoparticles. The results show that the nanocomposite structures of fluorescence molecules-metal nanoparticles-AAO have a considerable potential in engineering molecular assemblies and creating functional materials of superior properties for future nanophotonics.     

Protonation effect on the nonlinear absorption, nonlinear refraction and optical limiting properties of tetraphenylporphyrin

Nonlinear optical properties of tetraphenylporphyrin (H2TPP) and protonated tetraphenylporphyrin (H4TPP2+) in toluene were investigated by Z-scan technique using a nanosecond laser with 5 ns pulse at 532 nm. Results show that H4TPP2+ exhibits weaker nonlinear refraction but enhanced reverse saturable absorption (RSA) and optical limiting performance in comparison with pristine H2TPP. Since no nonlinear scattering is observed in H4TPP2+ under low input fluence, and H4TPP2+ exhibits weaker nonlinear scattering signals than H2TPP under high input fluence, the enhancement of RSA and optical limiting performance can be attributed to the larger ratio of excited state absorption cross-section to that of the ground state of H4TPP2+. H4TPP2+ also exhibits superior optical limiting performance, even better than the benchmark RSA material C60.     

Optical Properties of Metacrystals Based on Protein Nanocages

The optical properties of 3D metacrystals made of gold nanoparticles in protein nanocages are studied. These metacrystals have sizes of tens of micrometers and are of high structural and optical quality. Through microspectroscopy measurements and model calculations it is demonstrated that the metacrystals show plasmonic absorption in the green wavelength range and are largely transparent in the red and infrared ranges. By using empty nanocages as placeholders in the metacrystal lattice, it is possible to control how strongly the metamaterial absorbs. Measurements on a pyramidal metacrystal show that it deflects visible light. The deflection shows evidence for anomalous refraction at short wavelengths and normal refraction at long wavelengths. The refractive dispersion is ascribed to the optical dispersion relation of the plasmonic metamaterial.     

Protein/Polymer‐Based Dual‐Responsive Gold Nanoparticles with pH‐Dependent Thermal Sensitivity

This article presents the synthesis and physicochemical behavior of dual‐responsive plasmonic nanoparticles with reversible optical properties based on protein‐coated gold nanoparticles grafted with thermosensitive polymer brushes by means of surface‐initiated atom transfer radical polymerization (SI‐ATRP) that exhibit pH‐dependent thermo‐responsive behavior. Spherical gold NPs of two different sizes (15 nm and 60 nm) and with different stabilizing agents (citrate and cetyltrimethylammonium bromide (CTAB), respectively) were first capped with bovine serum albumin (BSA). The resulting BSA‐capped NPs (Au@BSA NPs) exhibited not only extremely high colloidal stability under physiological conditions, but also a reversible U‐shaped pH‐responsive behavior, similar to pure BSA. The ?‐amine of the L‐lysine in the protein coating was then used to covalently bind an ATRP‐initiator, allowing for the SI‐ATRP of thermosensitive polymer brushes of oligo(ethylene glycol) methacrylates with an LCST of 42 °C in pure water and around 37 °C under physiological conditions. Such protein coated nanoparticles grafted with thermosensitive polymers exhibit a smart pH‐dependent thermosensitive behavior.     

石墨烯-Au纳米复合体系的构筑及其光限幅效应

首先对Au纳米颗粒进行巯基修饰,再对其采用表面活性剂十六烷基三甲基溴化铵(CTAB)进行二级修饰,并将其自组装负载于石墨烯纳米毯(GNSs)上。通过紫外-可见吸收光谱证明Au纳米颗粒在石墨烯纳米毯(GNSs)上的成功负载。通过透射电子显微镜探明其微观结构,表明Au纳米颗粒在石墨烯纳米毯上呈现局部规整排列,其原因与石墨烯纳米毯自身的平整结构有关。采用开孔Z-扫描技术研究了负载Au纳米颗粒的石墨烯纳米毯的非线性光限幅性能,结果表明:其光限幅起始阈值明显下降,在低入射能量时即产生光限幅特性。并发现入射光强增大时非线性散射增强,说明非线性散射是产生复合体系的非线性光限幅效应的重要机理。     

C_(60)水溶胶的反饱和吸收与光限制效应

本文首次报道了C60水溶胶反饱和吸收和光限制效应的实验研究结果。利用532nm；15ns激光研究此样品的激光透过特性，观测到反饱和吸收过程，即实现了光限制效应。与C60苯溶液相比有较好的光限制效应。     

金纳米颗粒增强富硅氮化硅发光特性的研究

采用时域有限差分(FDTD)方法,对Au纳米颗粒的尺寸和形貌对于其光学特性的影响进行了系统的理论研究。通过采用等离子体增强化学气相沉积(PECVD)、晶化处理、电子束蒸发和高温退火等工艺,制备基于局域表面等离子共振(LSPR)效应的富硅氮化硅发光芯片。利用拉曼光谱仪、扫描电子显微镜(SEM)、奥林巴斯显微镜等对不同结构Au纳米颗粒富硅氮化硅发光器件的特性进行了表征。研究表明,通过对Au纳米颗粒的大小、形状和分布合理优化,富硅氮化硅芯片的发光强度在570nm波长附近提升了7倍,增强峰的位置红移了10nm。