We present a tunable resonator consisting of a colossal magnetoresistant cross in which a smaller gold cross is embedded. Simulations show the resonance frequencies of the resonator move into the infrared regime when ...We present a tunable resonator consisting of a colossal magnetoresistant cross in which a smaller gold cross is embedded. Simulations show the resonance frequencies of the resonator move into the infrared regime when there is a change in the intensity of the external magnetic field applied to the resonator. The source of the tunability is the variance in the colossal magnetoresistance in the resonator when the intensity of the magnetic field changes, which accordingly leads to a shift in the resonance frequency. Such a method offers a new way to achieve tunability, which has potential applications in controllable photoelectric elements.展开更多
An asymmetric metamaterial exhibiting an analog of double electromagnetically induced transparency （EIT） in the middle-infrared region is reported. The metamaterial consists of two-layered arrays of Ushaped rings em...An asymmetric metamaterial exhibiting an analog of double electromagnetically induced transparency （EIT） in the middle-infrared region is reported. The metamaterial consists of two-layered arrays of Ushaped rings embedded in a medium, with the lower layer rotated by 90°. Our simulations demonstrate that both maximum group indexes are extremely high at the two EIT-like positions. The group index reaches about thrice the currently reported maximum value at the high-frequency EIT-like position. The transmittance at the two transparency positions also possesses extremely high Q factors, which is conducive to controlling the propagation of electromagnetic waves.展开更多
基金supported by the Graduate Innovation Project of Jiangsu Normal University(No.2013YYB138)the National Natural Science Foundation of China(Nos.61401182 and 61372057)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD),China
文摘We present a tunable resonator consisting of a colossal magnetoresistant cross in which a smaller gold cross is embedded. Simulations show the resonance frequencies of the resonator move into the infrared regime when there is a change in the intensity of the external magnetic field applied to the resonator. The source of the tunability is the variance in the colossal magnetoresistance in the resonator when the intensity of the magnetic field changes, which accordingly leads to a shift in the resonance frequency. Such a method offers a new way to achieve tunability, which has potential applications in controllable photoelectric elements.
基金supported by the National Natural Science Foundation of China(No.BK2011203)the Graduate Innovation Project of Jiangsu Province(No.CXLX110908)the Priority Academic Program Development(PAPD)of Jiangsu Higher Education Institutions,China
文摘An asymmetric metamaterial exhibiting an analog of double electromagnetically induced transparency （EIT） in the middle-infrared region is reported. The metamaterial consists of two-layered arrays of Ushaped rings embedded in a medium, with the lower layer rotated by 90°. Our simulations demonstrate that both maximum group indexes are extremely high at the two EIT-like positions. The group index reaches about thrice the currently reported maximum value at the high-frequency EIT-like position. The transmittance at the two transparency positions also possesses extremely high Q factors, which is conducive to controlling the propagation of electromagnetic waves.
