A polarization-insensitive, square split-ring resonator（SSRR） is simulated and experimented. By investigating the influence of the asymmetrical arm width in typical SSRRs, we find that the variation of the arm width...A polarization-insensitive, square split-ring resonator（SSRR） is simulated and experimented. By investigating the influence of the asymmetrical arm width in typical SSRRs, we find that the variation of the arm width enables a blue shift of the resonance frequency for the 0° polarized wave and a red shift of the resonance frequency for the 90° polarized wave. Thus, the resonance frequency for the 0° polarized wave and the resonance frequency for the 90° polarized wave will be identical by asymmetrically adjusting the arm width of the SSRR. Two modified, split-ring resonators（MSRRs） that are insensitive to the polarization with asymmetrical arm widths are designed, fabricated, and tested. Excellent agreement between the simulations and experiments for the MSRRs demonstrates the polarization insensitivity with asymmetrical arm widths. This work opens new opportunities for the investigation of polarization-insensitive, split-ring resonator metamaterials and will broaden the applications of split-ring resonators in various terahertz devices.展开更多
This paper examines inflation dynamics in Greater China. Using an asymmetric error correction model we investigate how inflation in Hong Kong and Macao are related to inflation in Chinese Mainland. Our results based o...This paper examines inflation dynamics in Greater China. Using an asymmetric error correction model we investigate how inflation in Hong Kong and Macao are related to inflation in Chinese Mainland. Our results based on data from July 1997 to December 2012 reveal that a long-term equilibrium relation exists between inflation in Chinese Mainland and inflation in both Hong Kong and Macao, the two Special Administrative Regions of China. The degree of inflation pass-through is higher for Macao than for Hong Kong. Moreover, we find no evidence of asymmetries in either Hong Kong and Macao＇s adjustment speeds towards long-run equilibrium or in the short-run pass-through of accelerating or decelerating inflation in the Mainland. Collectively, our results show a close relationship among price dynamics of the three economies and call for a reconsideration of the exchange rate anchor in the Greater China Region.展开更多
A novel dual-wavelength fiber laser with asymmetric fiber Bragg grating(FBG) Fabry-Perot(FP) cavity is proposed and experimentally demonstrated. A couple of uniform FBGs are used as the cavity mirrors, and the third F...A novel dual-wavelength fiber laser with asymmetric fiber Bragg grating(FBG) Fabry-Perot(FP) cavity is proposed and experimentally demonstrated. A couple of uniform FBGs are used as the cavity mirrors, and the third FBG is used as intracavity wavelength selector by changing its operation temperature. Experimental results show that by adjusting the operation temperature of the intracavity wavelength selector, a tunable dual-wavelength laser emission can be achieved. The results demonstrate the new concept of dual-wavelength lasing with asymmetric FBG FP resonator and its technical feasibility.展开更多
基金supported by the National High Technology Research and Development Program of China (No. 2011AA010204)the National Natural Science Foundation of China (Nos. 91438118 and 61370011)the Fundamental Research Funds for the Central Universities of China (No. ZYGX2014J037)
文摘A polarization-insensitive, square split-ring resonator（SSRR） is simulated and experimented. By investigating the influence of the asymmetrical arm width in typical SSRRs, we find that the variation of the arm width enables a blue shift of the resonance frequency for the 0° polarized wave and a red shift of the resonance frequency for the 90° polarized wave. Thus, the resonance frequency for the 0° polarized wave and the resonance frequency for the 90° polarized wave will be identical by asymmetrically adjusting the arm width of the SSRR. Two modified, split-ring resonators（MSRRs） that are insensitive to the polarization with asymmetrical arm widths are designed, fabricated, and tested. Excellent agreement between the simulations and experiments for the MSRRs demonstrates the polarization insensitivity with asymmetrical arm widths. This work opens new opportunities for the investigation of polarization-insensitive, split-ring resonator metamaterials and will broaden the applications of split-ring resonators in various terahertz devices.
文摘This paper examines inflation dynamics in Greater China. Using an asymmetric error correction model we investigate how inflation in Hong Kong and Macao are related to inflation in Chinese Mainland. Our results based on data from July 1997 to December 2012 reveal that a long-term equilibrium relation exists between inflation in Chinese Mainland and inflation in both Hong Kong and Macao, the two Special Administrative Regions of China. The degree of inflation pass-through is higher for Macao than for Hong Kong. Moreover, we find no evidence of asymmetries in either Hong Kong and Macao＇s adjustment speeds towards long-run equilibrium or in the short-run pass-through of accelerating or decelerating inflation in the Mainland. Collectively, our results show a close relationship among price dynamics of the three economies and call for a reconsideration of the exchange rate anchor in the Greater China Region.
基金supported by the National Natural Science Foundation of China(No.60777020)the Hubei Provincial Natural Science Foundation of China(No.2008CDB317)the Innovation Project of Hubei Provincial Department of Education of China(No.2012344/104892013043)
文摘A novel dual-wavelength fiber laser with asymmetric fiber Bragg grating(FBG) Fabry-Perot(FP) cavity is proposed and experimentally demonstrated. A couple of uniform FBGs are used as the cavity mirrors, and the third FBG is used as intracavity wavelength selector by changing its operation temperature. Experimental results show that by adjusting the operation temperature of the intracavity wavelength selector, a tunable dual-wavelength laser emission can be achieved. The results demonstrate the new concept of dual-wavelength lasing with asymmetric FBG FP resonator and its technical feasibility.
