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We propose a plasmonic filter with a notch located along a rectangular resonator. The finite difference time domain method is utilized to investigate and analyze the transmission characteristics of the filter. Results reveal that the introduction of the notch affects the first and second resonant modes of the resonator in different manners due to different magnetic field distributions inside the resonator...
A photonic approach using a single laser source and two quadrature optical filters (QOFs) is proposed to perform instantaneous frequency measurement (IFM). In the proposed approach, two QOFs with in-phase and quadrature filtering responses are designed. The wavelength of the laser source is aligned at the peak of the in-phase filtering response and at the -3-dB point of the quadrature response simultaneously...
An approach using a single laser source and two optical comb filters is proposed to performing microwave frequency measurement. In the proposed system, two filters with quadrature comb filtering responses are firstly constructed. The light wave of the laser source is modulated by a microwave signal under the carrier-suppression and single sideband modulation condition. The single sideband of the modulated...
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