检索结果-南通市图书馆

Hybrid-cavity semiconductor lasers with a whispering-gallery cavity for controlling Q factor

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2018年第8期61卷 5-17页

作者： yongzhen huang Xiuwen MA Yuede YANG Jinlong XIAO Yun DU State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors & College of Materials Science and Optoelectronic Technology University of Chinese Academy of SciencesChinese Academy of Sciences

Hybrid cavities composed of a Fabry-P′erot(FP) cavity and a whispering-gallery mode(WGM)microcavity have been proposed and demonstrated for modulating mode Q factor to realize single mode and optical bistable lasers. In this article, we report hybrid cavity lasers with a pentagon microcavity and a square microcavity, respectively. The reflectivity spectra of different microcavities are simulated to select microcavities for hybrid cavities. Mode coupling with mode Q factor enhancement is investigated numerically and experimentally. Stable single mode operations with a high coupling efficiency to a single mode fiber are realized for a hybrid cavity laser with a square microcavity. Furthermore, optical bistability hybrid lasers are investigated as the microcavity is unbiased, due to saturable absorption in the microcavity and mode competition, respectively. All-optical flip-flop is demonstrated using trigger optical pulses with a width of100 ps for mode competition bistability. The stable single mode operation and optical bistability of hybrid cavity lasers may shed light on the applications for photonic integrated circuits and optical signal processing.

关键词： optical microcavity semiconductor lasers hybrid cavity optical bistability single mode laser

Output characteristics of square and circular resonator microlasers connected with two output waveguides

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Technological Sciences 2013年第3期56卷 538-542页

作者： huang yongzhen Lü XiaoMeng LIN JianDong DU Yun State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of Sciences

Square and circular resonator microlasers connected with two output waveguides are investigated for correlation of output powers from the two output *** square resonator microlasers with two output waveguides connected at the midpoint of one side and one vertex are fabricated and tested by measuring the output power versus injection current and the laser spectra of the two *** laser spectra indicated that the output power correlation between the two output ports is very weak because of different lasing modes in different ports of the square *** resonator microlaser with two output waveguides can realize single mode operation and has good output correlation from the two *** the output power from one port of the circular microlasers can be monitored by that of another port.

关键词： AlGaInAs/InP semiconductor microlasers square resonator microlasers circular resonator microlasers

Distribution of organic carbon fractions in soil aggregates in Chinese fir plantations with different stand ages

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Ecological Processes 2021年第1期10卷 646-658页

作者： Xinxin He yongzhen huang Qianchun Zhang Shaoming Ye Shengqiang Wang Forestry College Guangxi UniversityNanning 530004China

Background:Revealing the variations in soil aggregate-related organic carbon(OC)and labile organic carbon(LOC)fractions in a chronosequence of Chinese fir plantations plays an important role in better understanding the impact of soil carbon sink or source on the Chinese fir plantation *** this study,soil samples in a depth of 0–20 cm were collected from Chinese fir plantations at different stand ages(0,9,17,and 26 years old)in Guangxi,*** the optimal moisture sieving method adopted,the soil aggregates of 4 different sizes were obtained,including>2-mm,2–1-mm,1–0.25-mm,and<0.25-mm *** OC and LOC fractions were measured in the aggregates of different *** LOC fractions included readily oxidizable carbon(ROC),particulate organic carbon(POC),microbial biomass carbon(MBC),water-soluble organic carbon(WOC),and mineralized organic carbon(MOC).Results:Soil aggregate stability,as indicated by the mean weight diameter(MWD),was the highest in the 17-yearold Chinese fir plantations and was significantly positively related(p<0.05)to the concentrations of OC and LOC fractions(except for the ROC and MOC),with the POC in *** for all stand ages of Chinese fir plantations,the concentrations of soil OC and LOC fractions were significantly increased as the aggregate size ***,there were more OC and LOC fractions distributed in the<0.25-mm *** the stand development,the concentrations of soil OC and LOC fractions first increased and then decreased,with the highest levels detected in the 17-year-old Chinese fir plantations,indicating that the 17-year-old Chinese fir plantations were conducive to the accumulation of soil OC and LOC ***:After 17 years of planting,promoted soil carbon(especially for the POC)accumulation contributes significantly to enhancing soil aggregate stability for the Chinese fir plantations in Guangxi,China.

关键词： Chinese fir plantation Soil aggregates Organic carbon Labile organic carbon fractions

Mode and modulation characteristics for microsquare lasers with a vertex output waveguide

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2015年第11期58卷 28-33页

作者： LONG Heng huang yongzhen YANG YueDe ZOU LingXiu XIAO JinLong XIAO ZhiXiong State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences

The mode and high-speed modulation characteristics are investigated for a microsquare laser with a side length of 16 ?m and a 2-?m-wide output waveguide connected to one vertex. The longitudinal and transverse mode characteristics are analyzed by numerical simulation and light ray model, and compared with the lasing spectra for the microsquare laser. Up to the fifth transverse mode is observed clearly from the lasing spectra. Single mode operation with the side mode suppression ratio of 41 d B is realized at the injection current of 24 m A, and the maximum output power of 0.53(0.18) m W coupled into the multiple(single) mode fiber is obtained at the current of 35 m A, for the microsquare laser at the temperature of 288 K. Furthermore, a flat small-signal modulation response is reached with the 3-d B bandwidth of 16.2 GHz and the resonant peak of 3.6 d B at the bias current of 34 m A. The K-factor of 0.22 ns is obtained by fitting the damping factor versus the resonant frequency, which implies a maximum intrinsic 3-d B bandwidth of 40 GHz.

关键词： microcavity modulation fabrication techniques semiconductor laser

Global modes and coupled modes for integrated twin circular-side octagon microlasers

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2022年第2期65卷 173-180页

作者： Ke YANG Yuede YANG Youzeng HAO Jiliang WU Yongtao huang Jiachen LIU Jinlong XIAO yongzhen huang State Key Laboratory of Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences

Whispering-gallery mode(WGM) microlasers are potential light sources for photonic integrated circuits and optical information processing. In this paper, an integrated twin circular-side octagon microlaser(TCOM) composed of two identical circular-side octagon microcavities(COMs) is proposed and demonstrated for realizing lasing mode control. In a TCOM, we found a global mode with the mode field of an "8" pattern(labeled "8" mode) in addition to weak coupling modes of traditional four-bounce modes. The "8" mode belongs to the whole coupled cavity and is insensitive to the refractive index offset of coupled COMs, but the weak coupling modes are strongly sensitive to the refractive index offset. Lasing mode transformation from multiple coupled modes to a single "8" mode is demonstrated by adjusting the refractive index offset through injection currents. Weak coupling modes for directly connected TCOMs and lasing mode control make the COM a potential unit for large-scale photonic integration and optical information processing.

关键词： optical microcavity semiconductor lasers coupled cavity lasing mode control photonic integration

同方期刊数据库

Differential expression of FOXO1 during development and myoblast differentiation of Qinchuan cattle and its association analysis with growth traits

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2018年第7期61卷 826-835页

作者： Yujia Sun Kunpeng Liu yongzhen huang Xianyong Lan Hong Chen College of Animal Science and Technology Northwest A&F University Shaanxi Key Laboratory of Molecular Biology for Agriculture Institute of Cellular and Molecular Biology Jiangsu Normal University

Our previous work reported a relationship between FOXO1 mutations and growth of Qinchuan(QC) cattle. Here, we performed differential expression analysis of FOXO1 and its association analysis with growth traits in QC cattle. First, we measured the expression of the FOXO1 gene in nine tissues during three developmental stages. The results showed that FOXO1 was abundantly expressed in tissues of calves but was strongly repressed in adulthood, although there was significant transcription in skeletal muscle. FOXO1 expression showed gradual up-regulation during differentiation of primary bovine skeletal muscle *** also identified six SNPs of the bovine FOXO1 gene by sequencing DNA pools of samples from 488 individuals, and association analysis indicated that five SNPs were significantly associated with some growth traits in the QC population. We further analyzed four haplotype combinations of the six SNPs and found significant correlation with body length(P<0.01). In conclusion, FOXO1 participates in bovine myocyte differentiation and expression, and may be a strong candidate as a gene that affects growth traits that could be exploited in a QC cattle breeding program. More generally, our data provide a new theoretical basis for QC beef breeding and beef quality improvement.

关键词： tissues expression myoblast differentiation sequence variants association analysis Qinchuan cattle

Whispering-gallery microcavity semiconductor lasers suitable for photonic integrated circuits and optical interconnects

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2009年第12期52卷 3447-3453页

作者： huang yongzhen YANG YueDe WANG ShiJiang XIAO JinLong CHE KaiJun DU Yun State Key Laboratory on Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesPO Box 912Beijing 100083China

The characteristics of whispering-gallery-like modes in the equilateral triangle and square microresonators are introduced,including directional emission triangle and square microlasers connected to an output *** propose a photonic interconnect scheme by connecting two directional emission microlasers with an optical waveguide on silicon integrated circuit *** measurement indicates that the triangle microlasers can work as a resonance enhanced photodetector for optical interconnect.

关键词： optical microcavity microlaser resonance mode optical interconnect

Square microcavity semiconductor lasers

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第11期27卷 176-185页

作者： Yuede Yang Haizhong Weng Youzeng Hao Jinlong Xiao yongzhen huang State Key Laboratory of Integrated Optoelectronics Institute of Semiconductors ＆ College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100083 China

Square microcavities, which support whispering-gallery modes with total internal reflections, can be employed as high-quality laser resonators for fabricating compact, low-threshold semiconductor lasers. In this paper, we review the recent progress of square microcavity semiconductor lasers. The characteristics of confined optical modes in the square microcavities are introduced briefly. Based on the mode properties of the square microcavities, dual-mode lasers with tunable wavelength intervals are realized for generating microwave signals. Furthermore, deformed square microcavity lasers with the sidewalls replaced by circular sides are proposed and experimentally demonstrated to enhance the mode confinement and increase the dual-mode interval to the THz range. In order to further reduce the device size, metal-confined wavelength-scale square cavity lasers are also demonstrated.

关键词： square microcavity whispering-gallery modes semiconductor lasers

MicroRNA bta-miR-365-3p inhibits proliferation but promotes differentiation of primary bovine myoblasts by targeting the activin A receptor type Ⅰ

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2021年第1期12卷 141-154页

作者： Dan Hao Xiaogang Wang Xiao Wang Bo Thomsen Yu Yang Xianyong Lan yongzhen huang Hong Chen College of Animal Science and Technology Northwest A&F UniversityShaanxi Key Laboratory of Animal GeneticsBreeding and ReproductionYangling 712100ShaanxiChina Department of Molecular Biology and Genetics Aarhus University8000 Aarhus CDenmark Quantitative Genomics Bioinformatics and Computational Biology GroupDepartment of Applied Mathematics and Computer ScienceTechnical University of DenmarkRichard Petersens PladsBuilding 3242800 Kongens LyngbyDenmark.

Background: MicroRNAs act as post-transcriptional regulators that repress translation or degrade mRNA *** microRNA has many mRNA targets and each mRNA may be targeted by several microRNAs. Skeletal muscles express a plethora of microRNA genes that regulate muscle development and function by controlling the expression of protein-coding target genes. To expand our understanding of the role of microRNA, specifically btamiR-365-3 p, in muscle biology, we investigated its functions in regulating primary bovine myoblast proliferation and ***: Firstly, we found that bta-miR-365-3 p was predominantly expressed in skeletal muscle and heart tissue in Chinese Qinchuan beef cattle. Quantitative PCR and western blotting results showed that overexpression of btamiR-365-3 p significantly reduced the expression levels of cyclin D1(CCND1), cyclin dependent kinase 2(CDK2) and proliferating cell nuclear antigen(PCNA) but stimulated the expression levels of muscle differentiation markers, i.e.,MYOD1, MYOG at both mRNA and protein level. Moreover, downregulation of bta-miR-365-3 p increased the expression of CCND1, CDK2 and PCNA but decreased the expression of MYOD1 and MYOG at both mRNA and protein levels. Furthermore, flow cytometry, EdU proliferation assays and immunostaining results showed that increased levels of bta-miR-365-3 p suppressed cell proliferation but promoted myotube formation, whereas decreased levels of bta-miR-365-3 p resulted in the opposite consequences. Finally, we identified that activin A receptor type I(ACVR1) could be a direct target of bta-miR-365-3 p. It was demonstrated that bta-miR-365-3 p can bind to the 3'UTR of ACVR1 gene to regulate its expression based on dual luciferase gene reporter ***, knock-down of ACVR1 was associated with decreased expressions of CDK2, CCND1 and PCNA but increased expression of MYOG and MYOD1 both at mRNA and protein ***: Collectively, these data suggested that bta-m

关键词： ACVR1 Bta-miR-365-3p Cattle Primary bovine myoblast