光子选通光谱烧孔的全息检测与图像存贮

报道在有机光子选通光谱烧孔材料苯基四苯并卟啉锌/芳晴系统中，进行全息光谱烧孔和图像存贮的实验结果．实验表明全息烧孔极大地提高了光谱孔的检测灵敏度和信噪比．通过全息光子选通光谱烧孔，成功地进行了光子选通型的频率选择的多幅全息图存贮，得到清晰的图像再现 关键词：     

Zntbp—CA／PhR体系的光子选通光谱烧孔

首次报道一种新的光子选通交谱烧孔体系Ｚｎｔｂｐ－ＣＡ／ＰｈＲ２０Ｋ温度下，在对应的非均匀展宽吸收带内的不同波长处实现了一系列光子选通光谱烧孔。文中就孔的温度效应，寿命，光擦除性能以及选通比值Ｇ等方面作了不同深度的讨论。     

物理学与新型(功能)材料专题系列介绍(Ⅵ) 光谱烧孔──下一代光存储技术

光存储技术由于能实现比其他信息存储技术更高的密度，受到各国重视．然而现行光存储技术的最高存储密度受到激光聚焦光斑最小尺寸限制．各国科学家竞相研究能突破这一限制．实现超高密度的下一代新技术．光子选通光谱烧孔就是其中的佼佼者．中国科学家在提高光子选通光谱烧孔工作温度方面做出了国际同行公认的贡献．光子选通光谱烧孔实际应用还有许多问题有待解决．     

无机材料BaFCl0.5Br0.5：Sm^2＋光子选通光谱烧孔

本文报道了无机材料的BaFCl_(0.5)Br_(0.5):Sm~(2+)的光子选通光谱烧孔.文中叙述了光子选通光谱烧孔的机制.在低温4.2K下进行多孔烧孔和探测.测量了孔的选通性和稳定性.实现了孔的可擦除和重复烧孔.测量结果表明,处于4.2K的BaFCl_(0.5)Br_(0.5):Sm~(2+)样品,在一个非均匀加宽轮廓内可实现1×10~3个以上数目的永久性光谱烧孔.     

几种有机电子转移型光谱烧孔材料的均匀线宽与温度的依赖关系

本文通过在不同温度下对金属卟琳系列光子选通光谱烧孔材料的测试,研究了部分有机电子转移型烧孔材料的均匀线宽随温度变化的关系,在30K到70K温度范围内得到了Γ_hom∝T^1.29±0.05的结果.     

光谱烧孔中孔的宽度和深度与烧孔光持续时间的关系

本文由光学Bloch方程出发,讨论了二能级系统光谱烧孔中孔宽和孔深与烧孔激光脉冲持续时间的关系.在强场下短脉冲烧孔中,用π脉冲可以得到足够深且宽度小于稳态值的孔.弱场下,孔深与烧孔时间成指数关系.Bloch方程的修正对上述两种条件下烧孔行为的描述无明显影响.以二能级系统光谱烧孔为基础,讨论了永久性光谱烧孔和光子选通光谱烧孔中孔的行为.     

光谱烧孔的偏振探测

在光子选通给体０体电子转移光谱烧孔的实验基础上，新采用了偏振方法探测烧出的孔，使孔的检测灵敏度和信噪比均得到了大幅度的提高。以此为工具，烧出了很好的多孔，并做了一系列样品烧孔性能的测试和分析。     

BaSO4Sm^2＋晶体的光谱及光子选通烧孔效应

首次报道—种新的无机光子造通光谱烧孔材料——BaSO_4:Sm~ (2+)的烧孔效应.并给出了有关光谱性质的实验结果.     

光子选通多重光谱烧孔中的光致填孔机制

报道了给体－受体电子转移型材料ｚｉｎｃ－ｔｅｔｒａｐｈｅｎｙｌｂｅｎｚｏｐｏｒｐｈｒｉｎ＋ｚｉｎｃ－ｔｅｔｒａｐｈｅｙｌ ｂｅｎｚｏｔｒｉｂｅｎｚｏｐｏｒｐｈｒｉｎ／ｐｈｙｄｒｏｘｙｂｅｎｚａｌｄｈｙｄｅ／ｐｏｌｙ（ｍｅｔｈｙｌ）ｍｅｔｈａｃｒｙｌａｔｅ的光子选通多重烧孔过程。结果表明要获得高质量的多重光谱孔，从短波往长波的逐次烧孔更为有效。其影响来自与波长有关的光致填孔现象，造成该填孔的主要机制     

Sm2+掺杂的无机光谱烧孔材料量子效率研究

本文由光谱烧孔的发光动力学方程出发,推导了脉冲光烧孔并选通的情况下量子效率的表达式.在77K下测量了以不同功率的560nm脉冲光烧孔并选通的条件下,孔深随烧孔脉冲数目的变化,验证了烧孔的量子效率与选通光强度的关系.在相同的烧孔条件下测量了BaF(Cl,Br):Sm²⁺与SrF(Cl,Br):Sm²⁺的孔深随脉冲数目的变化,验证了量子效率与⁵D_J-⁷F₀跃迁几率的关系.     

亚表面双球孔洞的热波散射与温度分布

基于非Fourier热传导方程,采用波函数展开法,对含双球形孔洞缺陷的半无限体材料内部的热波散射与温度分布进行了研究,给出了材料内部任一点温度的解析解和表面温度分布的数值计算结果。分析了孔洞的几何参数和物理参数对金属材料表面温度分布的影响。结果表明:相对热扩散长度、入射波波数和埋藏深度对表面温度分布的影响比较大,当孔洞间距较大时,可以忽略孔洞之间的热波散射。     

Decay of multilayer holes on SrTiO3(0 0 1)

We have studied the decay kinetics of nanoscale multilayer holes on SrTiO₃(0 0 1) surfaces, using variable temperature scanning tunneling microscopy. We have performed real time observation of the decay of multilayer holes with diameters of 10 nm order at 750 °C. We have found that the hole decays, filling layer by layer from the bottom while expanding the periphery of the hole. We have performed numerical simulations of hole decay based on a step flow model. The observed decay kinetics is found to be diffusion limited with local mass conservation.     

Particle acceleration in Horava–Lifshitz black holes

In this paper we calculate the center-of-mass energy of two colliding test particles near the rotating and non-rotating Horava–Lifshitz black hole. For the case of a slowly rotating KS solution of Horava–Lifshitz black hole we compare our results with the case of Kerr black holes. We confirm the limited value of the center-of-mass energy for static black holes and unlimited value of the center-of-mass energy for rotating black holes. Numerically, we discuss temperature dependence of the center-of-mass energy on the black hole horizon. We obtain the critical angular momentum of particles. In this limit the center-of-mass energy of two colliding particles in the neighborhood of the rotating Horava–Lifshitz black hole could be arbitrarily high. We found appropriate conditions where the critical angular momentum could have an orbit outside the horizon. Finally, we obtain the center-of-mass energy corresponding to this circle orbit.     

Thermodynamics,phase transitions and Ruppeiner geometry for Einstein–dilaton–Lifshitz black holes in the presence of Maxwell and Born–Infeld electrodynamics

In this paper, we first obtain the higher-dimen-sional dilaton–Lifshitz black hole solutions in the presence of Born–Infeld (BI) electrodynamics. We find that there are two different solutions for the cases of \(z=n+1\) and \(z\ne n+1\) where z is the dynamical critical exponent and n is the number of spatial dimensions. Calculating the conserved and thermodynamical quantities, we show that the first law of thermodynamics is satisfied for both cases. Then we turn to the study of different phase transitions for our Lifshitz black holes. We start with the Hawking–Page phase transition and explore the effects of different parameters of our model on it for both linearly and BI charged cases. After that, we discuss the phase transitions inside the black holes. We present the improved Davies quantities and prove that the phase transition points shown by them are coincident with the Ruppeiner ones. We show that the zero temperature phase transitions are transitions in the radiance properties of black holes by using the Landau–Lifshitz theory of thermodynamic fluctuations. Next, we turn to the study of the Ruppeiner geometry (thermodynamic geometry) for our solutions. We investigate thermal stability, interaction type of possible black hole molecules and phase transitions of our solutions for linearly and BI charged cases separately. For the linearly charged case, we show that there are no phase transitions at finite temperature for the case \( z\ge 2\). For \(z<2\), it is found that the number of finite temperature phase transition points depends on the value of the black hole charge and there are not more than two. When we have two finite temperature phase transition points, there is no thermally stable black hole between these two points and we have discontinuous small/large black hole phase transitions. As expected, for small black holes, we observe finite magnitude for the Ruppeiner invariant, which shows the finite correlation between possible black hole molecules, while for large black holes, the correlation is very small. Finally, we study the Ruppeiner geometry and thermal stability of BI charged Lifshtiz black holes for different values of z. We observe that small black holes are thermally unstable in some situations. Also, the behavior of the correlation between possible black hole molecules for large black holes is the same as for the linearly charged case. In both the linearly and the BI charged cases, for some choices of the parameters, the black hole system behaves like a Van der Waals gas near the transition point.     

Room-temperature grating-based morphological hole burning in Sm2+-doped glass powders

We have observed grating-based morphological hole burning in Sm2+-doped glass powders at room temperature. When photobleaching on the 4f(6)-4f(5)5d transition of Sm2+ is combined with multiple light scattering, holes are produced in frequency and wave-vector domains. The hole profile depends on the amount of light absorption of Sm2+; it sharpens as the absorption decreases. The variation of the hole shape is explained theoretically based on a diffusion approximation.