We present the design of an all-optical diode in a metal-dielectric structure where plasmonic attenuation and quasi-phase-matching are harnessed to greatly improve its performance.Due to the asymmetric design of the s...We present the design of an all-optical diode in a metal-dielectric structure where plasmonic attenuation and quasi-phase-matching are harnessed to greatly improve its performance.Due to the asymmetric design of the second-order nonlinear coefficient,different incident directions will ignite different plasmonic nonlinear processes,which compensate or accelerate plasmonic attenuation.As a result,a unidirectional output of plasmonic signal is achieved.This designed all-optical diode shows advantages of low power consumption,short sample length,high isolation contrast,wide acceptance of structural and initial conditions,and tunable unidirectionality,and becomes of practical interest.展开更多
We fabricate z-cut LiNbO3 nonlinear photonic crystal with two-dimensional dodecagonal superlattice by applying high voltage pulses.By using collinear quasi-phase matching technique,second-harmonics at five wavelengths...We fabricate z-cut LiNbO3 nonlinear photonic crystal with two-dimensional dodecagonal superlattice by applying high voltage pulses.By using collinear quasi-phase matching technique,second-harmonics at five wavelengths 620 nm,574 nm,555 nm,515nnm and 492 nm are observed simultaneously in one quasiperiodically poled crystal.The distributions of the reciprocal vectors and the diffraction spots in this quasiperiodic structure are theoretically and experimentally analyzed.The same results can be obtained by rotating around z-axis by intervals of 30°.展开更多
We theoretically and experimentally study the cavity modes in a gyromagnetic photonic crystal (GPC).Because the permeability of gyromagnetic material relies on the dc magnetic field exerted upon it,the band gap of the...We theoretically and experimentally study the cavity modes in a gyromagnetic photonic crystal (GPC).Because the permeability of gyromagnetic material relies on the dc magnetic field exerted upon it,the band gap of the GPC is supposed to be tunable.Based on this,it is expected that the cavity mode in the GPC is also tunable under the variation of dc magnetic fields.The relation between the frequency of the cavity mode and exerted dc magnetic field is theoretically investigated.Furthermore,we measure the frequency variation of the cavity mode in the GPC and demonstrate the tunable property of GPC cavity.展开更多
Bacillus lincheniformis is a representative probiotic, widely used in food, medicine and livestock industries and other industries. In this experiment, a strain of Bacillus lincheniformis was isolated and identified, ...Bacillus lincheniformis is a representative probiotic, widely used in food, medicine and livestock industries and other industries. In this experiment, a strain of Bacillus lincheniformis was isolated and identified, which was used to ferment celluloserich substrate. The effects were analyzed. The experimental results showed that Bacillus lincheniformis had the capacity to degrade cellulose(32.8% was degraded) and less capacity to degrade hemicellulose(7.9% was degraded), which could not degrade ligin. The total protein contents in the products fermented by Bacillus lincheniformis with cellulose-rich substrate riched by 11.6%, compared with the fermented products with no cellulose-rich substrate, furthermore, the contents of Met, Lys and Leu riched by 14%, 17.5% and 4.1%, respectively. These results showed that Bacillus lincheniformis had the ability to degrade cellulose and it provided experimental data for further utilization.展开更多
基金Supported by the National Basic Research Program of China under Grant No 2011CB922002the National Natural Science Foundation of China under Grant Nos 10634080 and 60736041.
文摘We present the design of an all-optical diode in a metal-dielectric structure where plasmonic attenuation and quasi-phase-matching are harnessed to greatly improve its performance.Due to the asymmetric design of the second-order nonlinear coefficient,different incident directions will ignite different plasmonic nonlinear processes,which compensate or accelerate plasmonic attenuation.As a result,a unidirectional output of plasmonic signal is achieved.This designed all-optical diode shows advantages of low power consumption,short sample length,high isolation contrast,wide acceptance of structural and initial conditions,and tunable unidirectionality,and becomes of practical interest.
基金Supported by the National Natural Science Foundation of China under Grant No 11004175the Communication University of China under Grant No XNL1207.
文摘We fabricate z-cut LiNbO3 nonlinear photonic crystal with two-dimensional dodecagonal superlattice by applying high voltage pulses.By using collinear quasi-phase matching technique,second-harmonics at five wavelengths 620 nm,574 nm,555 nm,515nnm and 492 nm are observed simultaneously in one quasiperiodically poled crystal.The distributions of the reciprocal vectors and the diffraction spots in this quasiperiodic structure are theoretically and experimentally analyzed.The same results can be obtained by rotating around z-axis by intervals of 30°.
基金Supported by the National Natural Science Foundation of China under Grant No 10904167the National Basic Research Program of China under Grant No 2011CB922002.
文摘We theoretically and experimentally study the cavity modes in a gyromagnetic photonic crystal (GPC).Because the permeability of gyromagnetic material relies on the dc magnetic field exerted upon it,the band gap of the GPC is supposed to be tunable.Based on this,it is expected that the cavity mode in the GPC is also tunable under the variation of dc magnetic fields.The relation between the frequency of the cavity mode and exerted dc magnetic field is theoretically investigated.Furthermore,we measure the frequency variation of the cavity mode in the GPC and demonstrate the tunable property of GPC cavity.
基金Supported by the Key Applied Technology Research and Development Program of Heilongjiang Province(GA15B203)Student Innovation and Pioneer Training Program(SIPT)of Northeast Agricultural University(SIPT,201610224153)
文摘Bacillus lincheniformis is a representative probiotic, widely used in food, medicine and livestock industries and other industries. In this experiment, a strain of Bacillus lincheniformis was isolated and identified, which was used to ferment celluloserich substrate. The effects were analyzed. The experimental results showed that Bacillus lincheniformis had the capacity to degrade cellulose(32.8% was degraded) and less capacity to degrade hemicellulose(7.9% was degraded), which could not degrade ligin. The total protein contents in the products fermented by Bacillus lincheniformis with cellulose-rich substrate riched by 11.6%, compared with the fermented products with no cellulose-rich substrate, furthermore, the contents of Met, Lys and Leu riched by 14%, 17.5% and 4.1%, respectively. These results showed that Bacillus lincheniformis had the ability to degrade cellulose and it provided experimental data for further utilization.
