Strain-assisted spin manipulation in a quantum well

We show that the efficiency of manipulating electron spins in semiconductor quantum wells can be enhanced by tuning strain strengths. The combined effects of intrinsic and strain-induced spinorbit couplings vary for different quantum wells, which provide an alternative route to understand the experimental phenomena brought in by the strain. The contribution to the electron-dipole-spin-resonance intensity induced by the strain can be changed through adjusting the direction of the ac electric field in the x-y plane of the quantum well and tuning the strain strengths.     

Recursive approach to study transport properties of atomic wire

In this study, we propose a recursive approach to study the transport properties of atomic wires. It is based upon a real-space block-recursion technique with Landauer's formula being used to express the conductance as a scattering problem. To illustrate the method, we have applied it on a model system described by a single band tight-binding Hamiltonian. Results of our calculation therefore may be compared with the reported results on Na-atom wire. Upon tuning the tight-binding parameters, we can distinctly identify the controlling parameters responsible to decide the width as well as the phase of odd-even oscillations in the conductance.     

SiC表面C 1s谱最优拟合参数的研究

提出了一种新的,用未限定拟合峰位置、半高宽和峰面积的X射线光电子谱拟合方法,研究了拟合峰的数目、函数类型及背景对SiC表面C 1s谱拟合结果的影响,并与样品表面宽扫描X射线光电子谱和红外掠反射吸收谱相对照,确定了SiC表面C 1s谱的最优拟合参数,获得了与文献中数值相同的 C 1s束缚能. 为SiC及其他材料表面元素窄扫描X射线光电子谱的拟合和化学态结构的鉴定奠定了基础. 关键词： SiC X射线光电子谱 C 1s谱     

电子传输层PBD对Alq_3∶DCJTB电致发光器件的影响(英文)

以PBD为电子传输层制作了一组掺杂型有机电致发光器件,并研究了掺杂器件中PBD对器件的光谱、亮度等的影响。发现PBD与NPB和DCJTB分别掺杂的器件的光谱与其它的器件不同,然后运用了载流子的注入、传输及PBD的传输特性等方法对光谱做出了合理的解释,并运用高斯截谱的方法分析了各个发光峰的产生原因。     

长条型SiC反射镜轻量化及支撑结构的设计

从满足空间光学遥感器反射镜在复杂工况下综合面形误差要求的角度出发,介绍了长条型反射镜柔性支撑结构材料的选择,讨论了反射镜轻量化及柔性支撑结构的设计方法,采用有限元法进行了工程分析及多次迭代优化,设计出了一种在不同重力方向下引入面形误差变化量RMS值小于λ/40(λ=632.8nm)的反射镜柔性支撑结构。检测实验证明,各项指标均满足设计要求。     

10 Gb/s Reconfigurable Optical Logic Gate Using a Single Hybrid-Integrated SOA-MZI

A novel reconfigurable Boolean device based on a single Mach-Zehnder interferometer with semiconductor optical amplifiers is demonstrated at 10 Gb/s using intensity return-to-zero modulated signals. The experimental results show that the device can be dynamically reconfigured to operate as a logic XOR, AND, OR, and NOT gate using optical switches. By properly adjusting the input powers, an extinction ratio higher than 10 dB may be obtained. The potential of integration of this architecture makes it an interesting approach in photonic computing and optical signal processing.     

All-optical ultrafast fractional differentiator

In this work we present a technique for the implementation of an ultrafast all-optical temporal differentiator. A photonic Mach–Zehnder interferometer can provide the required spectral response for fractional differentiation within certain fractional order extent. This device shows a good accuracy calculating the fractional time derivatives of the complex field of an arbitrary input optical waveform. Analytical expressions were found relating the photonic Mach–Zehnder parameters and the required spectral characteristics of the differentiator for integer and fractional operation. The introduced concept is supported by numerical simulations.     

Design and optimization of an arbitrarily segmented traveling wave electrode for an ultrahigh speed electroabsorption modulator

The modulation response of an arbitrarily segmented traveling wave electroabsorption modulator (TW-EAM) with a non-periodic electrode layout is analyzed with an effective approach based on the transmission line theory. An optimization method based on a genetic algorithm is used to optimize the segmented electrode with additional capacitive pads for a TW-EAM. Optimized electrode structures are given for 165 μm-length devices under standard 50 Ω RF termination condition and 210 μm-length devices with smaller integrated resistors. Great enhancement of performances in modulation response is achieved as compared to the periodic design reported previously. The simulation with the parameters extracted from measurement results suggests that a 3 dB-bandwidth over 100 GHz could be achieved. The eye diagram from the simulation demonstrates that such devices would be competent for a 100Gb/s optical network.     

利用电子传输层掺杂改善有机发光器件的效率

利用BCP掺杂到电子传输层Alq中,在掺杂层中阻挡了空穴的迁移,调整了空穴和电子的平衡,将激子有效地限制在发光层中发光,从而增加有机电致发光器件的效率.器件的最大电流效率在外加电压9 V时达到4.1 cd/A(掺杂浓度8%时),与一般未掺杂器件相比效率提高了2倍多.同时也减少空穴到达阴极,而减少发光淬灭.     

Surface-Enhanced Raman Spectroscopy-Based Optical Biosensor for Liquid Biopsy: Toward Precision Medicine

Liquid biopsy is regarded as a promising strategy for assisting precision medicine because of its convenience, noninvasiveness, and ability to overcome tumor heterogeneity and achieve early detection. Recently, impressive advancements in plasmonic biosensors, artificial intelligence, and portable Raman equipment have yielded unprecedented progress in surface-enhanced Raman spectroscopy (SERS)–based point-of-care testing (POCT) systems for liquid biopsy. The development of these systems presents a paradigm shift in on-site liquid biopsy applications by leveraging the unique benefits of efficiency, fast analysis, portability, affordability, and user-friendliness. Herein, these advances are introduced over the last 3 years in the field of SERS-based POCT systems for labeled and label-free biomarker analysis in body fluids, including tumor circulating proteins and cells, exosomes, micro-RNA, and circulating tumor DNA. Additionally, powerful machine learning algorithms (including deep learning algorithms) are integrated with SERS to effectively extract potential data features and generate precise diagnostic models. The review highlights the use of handheld and portable Raman devices in significantly promoting the application of SERS-based POCT in clinical scenarios. Finally, the review outlines the challenges and future perspectives of this technology.