We present hybrid tunable lasers at 2.0-μm wavelength,seamlessly integrated within silicon photonic circuits for advanced biomedical applications.Leveraging III/V semiconductor materials for gain and silicon ring res...We present hybrid tunable lasers at 2.0-μm wavelength,seamlessly integrated within silicon photonic circuits for advanced biomedical applications.Leveraging III/V semiconductor materials for gain and silicon ring resonators for tuning,the laser achieves a tuning range of 25 nm,precise adjustments below 0.1 nm,and a side-mode suppression ratio of 40 d B.This advancement contributes to the progress in photonic integrated circuits beyond the telecommunication wavelength range,offering scalable and cost-effective solutions for enhanced spectroscopic systems within the 2.0-μm wavelength range.展开更多
Fusarium wilt,caused by the soil-borne fungal pathogen,Fusarium oxysporum f.sp.cubense(Foc),is considered as one of the most threatening diseases of banana.The Cavendish variety,resistant to Foc race 1(R1),is suscepti...Fusarium wilt,caused by the soil-borne fungal pathogen,Fusarium oxysporum f.sp.cubense(Foc),is considered as one of the most threatening diseases of banana.The Cavendish variety,resistant to Foc race 1(R1),is susceptible to tropical race 4(TR4),an aggressive race of the pathogen which is of increasing concern worldwide.Previous studies have revealed that plant small RNAs(sRNAs)play crucial roles in the host response to pathogen infection.To investigate the roles of sRNAs involved in the interaction of the banana-Foc pathosystem,small RNA profiles of Cavendish banana roots inoculated with Foc TR4 and Foc R1 were obtained and analyzed in the present study using Next-Generation Sequencing(NGS)technology.A total of 112 discrete mature microRNAs(miRNAs)belonging to 22 known miRNA families were found across all constructed sRNA libraries.The expression of miR166,miR159 and miR156 was upregulated in TR4-inoculated samples as compared to mock-inoculated samples,while the expression of these miRNAs was approximately the same in R1-inoculated and mock-inoculated samples.Consistent with the sequencing data,qRT-PCR results demonstrated up-regulation of these miRNAs and down-regulation of their target genes in TR4-inoculated samples,but not in R1-inoculated samples.Considering Cavendish banana is resistant to R1 and susceptible to TR4,it is possible that these sRNAs and their target genes are involved in particular plant defence pathways such as salicylic acid-based defence.The findings will pave way for future investigations of the defence mechanism and potential approaches of resistance improvement.展开更多
Mainstream silicon photonic integrated circuits are based on compact and low-loss silicon-on-insulator(SOI)waveguide platforms. However, monolithic SOI-based photonics provides only a limited number of functional devi...Mainstream silicon photonic integrated circuits are based on compact and low-loss silicon-on-insulator(SOI)waveguide platforms. However, monolithic SOI-based photonics provides only a limited number of functional device types. Here, to extend the on-chip capabilities, we propose a general heterogeneous integration approach to embed highly nonlinear Ⅲ-Ⅴ(Al Ga As) photonics into the SOI platform. We develop low-loss AlGaAs-on-SOI photonic circuits with integrated Si waveguides and showcase sub-milliwatt-threshold(-25 mW) Kerr frequency comb generation in ultrahigh-QAlGaAs microrings(Q over 10^(6)) at the telecom bands. Our demonstration complements existing mature Si photonics technology with efficient nonlinear functionalities provided by Ⅲ-Ⅴ and propels conventional Si photonics into emerging nonlinear photonic applications towards fully chip-based nonlinear engines.展开更多
基金King Abdullah University of Science and Technology(RFS-TRG2024-6196,RFS-OFP2023-5558,FCC/1/5939)。
文摘We present hybrid tunable lasers at 2.0-μm wavelength,seamlessly integrated within silicon photonic circuits for advanced biomedical applications.Leveraging III/V semiconductor materials for gain and silicon ring resonators for tuning,the laser achieves a tuning range of 25 nm,precise adjustments below 0.1 nm,and a side-mode suppression ratio of 40 d B.This advancement contributes to the progress in photonic integrated circuits beyond the telecommunication wavelength range,offering scalable and cost-effective solutions for enhanced spectroscopic systems within the 2.0-μm wavelength range.
基金funded by the Accelerated Partnership Grant,Queensland Government(2014000652)Shulang Fei’s PhD programme is supported by the China Scholarship Council and the University of Queensland。
文摘Fusarium wilt,caused by the soil-borne fungal pathogen,Fusarium oxysporum f.sp.cubense(Foc),is considered as one of the most threatening diseases of banana.The Cavendish variety,resistant to Foc race 1(R1),is susceptible to tropical race 4(TR4),an aggressive race of the pathogen which is of increasing concern worldwide.Previous studies have revealed that plant small RNAs(sRNAs)play crucial roles in the host response to pathogen infection.To investigate the roles of sRNAs involved in the interaction of the banana-Foc pathosystem,small RNA profiles of Cavendish banana roots inoculated with Foc TR4 and Foc R1 were obtained and analyzed in the present study using Next-Generation Sequencing(NGS)technology.A total of 112 discrete mature microRNAs(miRNAs)belonging to 22 known miRNA families were found across all constructed sRNA libraries.The expression of miR166,miR159 and miR156 was upregulated in TR4-inoculated samples as compared to mock-inoculated samples,while the expression of these miRNAs was approximately the same in R1-inoculated and mock-inoculated samples.Consistent with the sequencing data,qRT-PCR results demonstrated up-regulation of these miRNAs and down-regulation of their target genes in TR4-inoculated samples,but not in R1-inoculated samples.Considering Cavendish banana is resistant to R1 and susceptible to TR4,it is possible that these sRNAs and their target genes are involved in particular plant defence pathways such as salicylic acid-based defence.The findings will pave way for future investigations of the defence mechanism and potential approaches of resistance improvement.
基金Defense Advanced Research Projects Agency(HR0011-15-C-055)。
文摘Mainstream silicon photonic integrated circuits are based on compact and low-loss silicon-on-insulator(SOI)waveguide platforms. However, monolithic SOI-based photonics provides only a limited number of functional device types. Here, to extend the on-chip capabilities, we propose a general heterogeneous integration approach to embed highly nonlinear Ⅲ-Ⅴ(Al Ga As) photonics into the SOI platform. We develop low-loss AlGaAs-on-SOI photonic circuits with integrated Si waveguides and showcase sub-milliwatt-threshold(-25 mW) Kerr frequency comb generation in ultrahigh-QAlGaAs microrings(Q over 10^(6)) at the telecom bands. Our demonstration complements existing mature Si photonics technology with efficient nonlinear functionalities provided by Ⅲ-Ⅴ and propels conventional Si photonics into emerging nonlinear photonic applications towards fully chip-based nonlinear engines.
