8 results about "Plasmon waveguide" patented technology

The invention discloses a polarization converter and a preparation method thereof. The polarization converter comprises a silicon dioxide substrate, a silicon core waveguide, a zinc oxide supporting layer, an asymmetric silver layer and a silicon dioxide substrate, the silicon core waveguide and the zinc oxide supporting layer are attached to the silicon dioxide substrate to form a substrate structure; the asymmetric silver layer is attached to the silicon dioxide substrate to form a silver film structure; the silver film structure is connected with the substrate structure through the zinc oxide supporting layer, and the asymmetric silver layer is located over the silicon core waveguide and does not make contact with the silicon core waveguide. Through a non-contact structure of the asymmetric silver layer and the silicon core waveguide, air is introduced as a low-refractive-index medium to construct a hollow mixed plasmon waveguide structure, so that the transmission loss is effectively reduced, and meanwhile, based on introduction of the asymmetric silver layer, the high integration level and the high conversion rate of the polarization converter are effectively guaranteed.

The invention discloses a vertical plasmon waveguide device structure capable of being coupled by an optical fiber and a preparation method of the vertical plasmon waveguide device structure, and belongs to the technical field of integrated optoelectronics, and the structure is composed of a pair of metal gratings and a vertical metal-medium-metal plasmon waveguide. The structure comprises a silicon substrate layer, a lower metal layer, a dielectric layer and an upper metal layer which are arranged from bottom to top and is divided into a grating area and a waveguide area, the grating area comprises a dielectric grating area and a metal grating layer, and the waveguide structure comprises the lower metal layer, the dielectric layer and the upper metal layer. According to the design of the invention, the limitation of mass production caused by an overlay process of a mode converter between heterogeneous integrated waveguides is avoided, and the preparation robustness of the device is improved. The optical insertion loss caused by the roughness of the side wall of the waveguide is improved in a metal deposition-dielectric spin coating-metal deposition mode, and the dielectric layer can be replaced to realize multiple device functions.

The embodiment of the invention provides a plasmon waveguide structure and a refractive index sensor, and the plasmon waveguide structure comprises a metal substrate layer; a multi-period composite metal grating layer; the dielectric layer is arranged between the metal substrate layer and the multi-period composite metal grating layer; wherein the multi-period composite metal grating layer is composed of nano-metal supercell structures which are periodically arranged in the direction, and each nano-metal supercell structure is formed by periodically arranging at least two metal structures with different grating periods in the direction according to a preset grating interval; and the structures are alternately arranged in the direction at preset periodic intervals. According to the invention, decoupling and flexible regulation and control of resonance position and intensity can be realized based on a plurality of independent resonant cavities with spatial separation provided by the multi-period composite metal grating layer.

The invention discloses a phase shifter and an antenna, and relates to the technical field of phase shifters. The phase shifter comprises an artificial surface plasmon circuit structure, wherein the artificial surface plasmon circuit structure comprises an artificial surface plasmon waveguide; the medium disturbance element and the artificial surface plasmon waveguide are opposite to each other and are arranged at an interval; and the MEMS actuator is connected with the medium disturbance element, and the MEMS actuator is configured to drive the medium disturbance element to move relative to the artificial surface plasmon waveguide, so that the medium disturbance element interacts with the local electromagnetic field of the artificial surface plasmon waveguide. Through the characteristics of high-precision driving and low power consumption of the MEMS technology, the provided phase shifter has low insertion loss and a wide phase adjustment range.

The application discloses a true time delay line based on a misaligned symmetric artificial surface plasmon structure and belongs to the field of novel microwave devices, comprising a metal ground, a dielectric substrate arranged above and below the metal ground, a true time delay line structure arranged on the dielectric substrate above the metal ground, the true time delay line structure comprising an artificial surface plasmon waveguide periodically arranged by a plurality of misaligned symmetric artificial surface plasmon unit structures loaded with varactor diodes, a microstrip line for feeding the artificial surface plasmon waveguide, and a varactor diode bias circuit composed of a metal patch and the microstrip line. The true time delay line based on the misaligned symmetric artificial surface plasmon structure has the characteristics of approximately constant time delay value in a wideband range, real-time regulation of the time delay value through the varactor diode, low insertion loss and easy processing, and has a wide application prospect in a wideband phased array system.

The invention provides a sliding symmetric unit structure and a circularly polarized frequency scanning antenna thereof. The sliding symmetric unit structure is provided with a first strip-shaped structure, a second strip-shaped structure and a third strip-shaped structure, one end of the first strip-shaped structure is connected with one end of the second strip-shaped structure, and a first included angle is formed between the first strip-shaped structure and the second strip-shaped structure; the other end of the second strip-shaped structure is connected with one end of the third strip-shaped structure, and a second included angle is formed between the second strip-shaped structure and the third strip-shaped structure. Through the structural characteristics, the artificial surface plasmon guided wave structure is adopted to realize frequency scanning, and the symmetry of an electric field is destroyed by loading a periodic circular patch and an arc groove, so that the technical problems of circular polarization and wide-angle scanning characteristics in a relatively wide frequency band range are solved.

The application discloses a kind of harmonic amplitude frequency modulators based on artificial surface plasmon, belong to novel microwave device field, by metal backplate, upper layer metal structure and separate dielectric layer constitute, upper layer metal structure is by the periodic arrangement of artificial surface plasmon unit structure loaded with PIN tube into time domain coding artificial surface plasmon waveguide, transition structure being arranged at the two ends of the time domain coding artificial surface plasmon waveguide, and high-frequency isolation structure of connection control signal composition, by controlling the period and duty cycle of the square wave signal, the frequency and amplitude adjustment of output harmonic signal are carried out, and 0 order harmonic is filtered out, the application has the amplitude frequency of output harmonic signal adjustable, can filter out 0 order harmonic, with the advantages of easy processing, small size and low cost.

The invention discloses a thin-film lithium niobate electro-optical modulator and a preparation method thereof, the modulator comprises a substrate layer, a first high refractive index layer, a low refractive index layer, a metal electrode layer and a second high refractive index layer from bottom to top in sequence, and the low refractive index layer is a thin-film lithium niobate layer; the substrate layer, the first high-refractive-index layer and the low-refractive-index layer are equal in width, light forms a mixed plasmon waveguide mode in the metal electrode layer and all layers below the metal electrode layer, a light field is localized in the low-refractive-index layer, and nonlinear interaction is enhanced; the width of the metal electrode layer and the width of the second high-refractive-index layer are the same and smaller than that of the substrate layer, light forms a conventional plasmon mode in the metal electrode layer and the second high-refractive-index layer, and a light field is distributed on an interface between the metal electrode layer and the second high-refractive-index layer; the light fields in the two modes are subjected to out-of-phase interference to form a coupled hybrid plasmon mode, the light fields are gathered in the low-refractive-index layer, the proportion of the light fields in the metal electrode layer is reduced, and then propagation loss is reduced.