Low-loss wideband terahertz wave gradient photonic crystal filter
A two-dimensional photonic crystal and filter technology, applied in the field of terahertz passive filters, can solve the communication requirements that are difficult to adapt to broadband and ultra-high speed, the bandwidth of terahertz wave photonic crystal filters is narrow, and the terahertz atmosphere cannot be applied. Communication system and other problems, to achieve the effect of ingenious design, simple structure, and improved coupling characteristics
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[0017] The present invention will be described in detail below in conjunction with the embodiments of the accompanying drawings. The terahertz wave graded photonic crystal filter of the present invention is as figure 1 As shown, the filter includes a two-dimensional photonic crystal formed by different circular silicon dielectric pillars arranged in a square lattice period. A row of dielectric pillars is horizontally removed in the middle of the photonic crystal to form a terahertz wave propagation channel. In the middle of the channel A resonant cavity structure composed of three lithium niobate dielectric columns is set, and the horizontal channel is divided into a horizontal input channel and a horizontal output channel by the resonant cavity. The entire two-dimensional photonic crystal filter has a symmetrical structure along the middle row of dielectric pillars. From the center to the edge, the size of each row of dielectric pillars remains the same, and the size of diffe...
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