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| 1 | High-speed multiwavelength InGaAs/InP quantum well nanowire array micro-LEDs for next generation optical communications显示文摘Miniaturized light sources at telecommunication wavelengths are essential components for on-chip optical communication systems.Here,we report the growth and fabrication of highly uniform p-i-n core-shell InGaAs/InP single quantum well(QW)nanowire array light emitting diodes(LEDs)with multi-wavelength and high-speed operations.Two-dimensional cathodoluminescence mapping reveals that axial and radial QWs in the nanowire structure contribute to strong emission at the wavelength of~1.35 and~1.55μm,respectively,ideal for low-loss optical communications.As a result of simultaneous contributions from both axial and radial QWs,broadband electroluminescence emission with a linewidth of 286 nm is achieved with a peak power of~17μW.A large spectral blueshift is observed with the increase of applied bias,which is ascribed to the band-filling effect based on device simulation,and enables voltage tunable multi-wavelength operation at the telecommunication wavelength range.Multi-wavelength operation is also achieved by fabricating nanowire array LEDs with different pitch sizes on the same substrate,leading to QW formation with different emission wavelengths.Furthermore,high-speed GHz-level modulation and small pixel size LED are demonstrated,showing the promise for ultrafast operation and ultracompact integration.The voltage and pitch size controlled multi-wavelength highspeed nanowire array LED presents a compact and efficient scheme for developing high-performance nanoscale light sources for future optical communication applications. | Fanlu Zhang Zhicheng Su Zhe Li Yi Zhu Nikita Gagrani Ziyuan Li Mark Lockrey Li Li Igor Aharonovich Yuerui Lu Hark Hoe Tan Chennupati Jagadish Lan Fu | 2023 | Opto-Electronic Science2023，2，5： | 1 |
| 2 | Implementation of a concentration-controlled chemical clock显示文摘Dear editor,In recent decades, researchers have started seeking for substitutes for silicon based circuits to perform computation in other fields, including synthetic biology and molecular computing [1, 2].Previous researches indicate that many circuit behaviors can be mapped to chemical reactions [3, 4]. | Chongzhou FANG Lulu GE Xiaosi TAN Ziyuan SHEN Zaichen ZHANG Xiaohu YOU Chuan ZHANG | 2021 | Science China(Information Sciences)2021，64，12： | 0 |
| 3 | Nanoengineered polypeptides from tetraphenylethylene-functionalized N-carboxyanhydride: Synthesis, self-assembly and intrinsic aggregation-induced emission显示文摘Ring-opening polymerization of N-carboxyanhydrides(NCAs)bearing pendant groups creates functional polypeptides.In this paper,we report the design,synthesis and polymerization of tetraphenylethylene(TPE)-modified NCA,which is used to incorporate aggregation-induced emission(AIE)-active segments into polypeptides.Specifically,we attempted the synthesis of amphiphilic methoxy poly(ethyleneglycol)-block-poly(γ-benzyl-L-glutamate)-block-poly(γ-4-(1,2,2-triphenylvinyl)benzyl-L-glutamate)(PEG-PBLG-PTPELG),which had well-controlled molecular weight and narrow polydispersity.The hydrophilic PEG and hydrophobic PBLG-PTPELG assembled into micelles in aqueous solution with diameter around 70 nm,displaying AIE at 480 nm.Our work demonstrates that the TPE-modified NCA is applicable for the preparation of the AIE-active polypeptides,integrating the AIE luminogens into the polypeptides which may offer unique opportunities for tuning AIE properties by adjusting the composition and conformation of polypeptides.We preliminarily explored the use of the amphiphilic polypeptides for the formulation of doxorubicin-containing micelles that can potentially be used for real-time monitoring of the nanomedicine distribution. | Xu Wang Zihao Zhao Tianrui Xue Zhengzhong Tan Ziyuan Song Shiqi Wei Yang Bo Ying Wang Jianjun Cheng | 2021 | Progress in Natural Science:Materials International2021，31，4： | 0 |
| 4 | Self-frequency-conversion nanowire lasers显示文摘Semiconductor nanowires(NWs)could simultaneously provide gain medium and optical cavity for performing nanoscale lasers with easy integration,ultracompact footprint,and low energy consumption.Here,we report Ⅲ-Ⅴsemiconductor NW lasers can also be used for self-frequency conversion to extend their output wavelengths,as a result of their non-centrosymmetric crystal structure and strongly localized optical field in the NWs.From a GaAs/In0.16Ga0.84As core/shell NW lasing at 1016 nm,an extra visible laser output at 508 nm is obtained via the process of second-harmonic generation,as confirmed by the far-field polarization dependence measurements and numerical modeling.From another NW laser with a larger diameter which supports multiple fundamental lasing wavelengths,multiple self-frequency-conversion lasing modes are observed due to second-harmonic generation and sum-frequency generation.The demonstrated self-frequency conversion of NW lasers opens an avenue for extending the working wavelengths of nanoscale lasers,even to the deep ultraviolet and THz range. | Ruixuan Yi Xutao Zhang Chen Li Bijun Zhao Jing Wang Zhiwen Li Xuetao Gan Li Li Ziyuan Li Fanlu Zhang Liang Fang Naiyin Wang Pingping Chen Wei Lu Lan Fu Jianlin Zhao Hark Hoe Tan Chennupati Jagadish | 2022 | Light(Science & Applications)2022，11，6： | 0 |
| 5 | Energy inefficiency diagnosis for Android applications: a literature review显示文摘Android applications are becoming increasingly powerful in recent years. While their functionality is still of paramount importance to users, the energy efficiency of these applications is also gaining more and more attention. Researchers have discovered various types of energy defects in Android applications, which could quickly drain the battery power of mobile devices. Such defects not only cause inconvenience to users, but also frustrate Android developers as diagnosing the energy inefficiency of a software product is a non-trivial task. In this work, we perform a literature review to understand the state of the art of energy inefficiency diagnosis for Android applications. We identified 55 research papers published in recent years and classified existing studies from four different perspectives, including power estimation method, hardware component, types of energy defects, and program analysis approach. We also did a cross-perspective analysis to summarize and compare our studied techniques. We hope that our review can help structure and unify the literature and shed light on future research, as well as drawing developers' attention to build energy-efficient Android applications. | Yuxia SUN Jiefeng FANG Yanjia CHEN Yepang LIU Zhao CHEN Song GUO Xinkai CHEN Ziyuan TAN | 2023 | Frontiers of Computer Science2023，17，1： | 0 |
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