Surface plasma filter based on connection bridge of rectangular ring resonant cavity and incident waveguide
A surface plasmon and resonant cavity technology, applied in instruments, optical filters, optics, etc., can solve problems such as difficult integration, large volume, and change of surface plasmon resonance frequency, and achieve small size, wide application prospects, and simple structure Effect
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[0016] The present invention is based on the surface plasmon filter of the bridge between the rectangular ring resonant cavity and the incident waveguide, which is mainly composed of metal (silver) layer, main waveguide, waveguide bridge, and rectangular ring resonant cavity. figure 1 . The metal layer (slab) can be produced by using a laser molecular beam crystal epitaxial growth system. The main waveguide, the rectangular ring resonant cavity and the waveguide bridge can be obtained by etching the metal plate by using the focused ion beam etching technology. The optical signal is introduced into the main waveguide through the coupling silicon waveguide or tapered optical fiber, and the optical signal is introduced into the rectangular ring resonant cavity through the waveguide bridge (different bridge lengths introduce different optimal resonance frequencies). When the optical signal is at the optimal resonance wavelength of the cavity lambda i (i=1,2,…), the incident ligh...
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