Surface Plasmon optical waveguide filter

Abstract

The invention relates to an optical filter device, and in particular relates to a surface Plasmon optical waveguide filter. The surface Plasmon optical waveguide filter comprises a metal waveguide, wherein a passage through which incident light and reflected light can pass and a resonant cavity for generating resonant wavelength are arranged in the metal waveguide, a dielectric medium is filled in the passage and the resonant cavity, and a metal gap which is used for obstructing the in and out of the optical wave is arranged between the passage and the resonant cavity. A sub-wavelength filter is constructed on the metal waveguide. The filter is simple in structure, small in size (only hundreds of nanometers) and easy for high-density optical integration; the research of an optical switch for optical communication is favored through the narrow-band filter with high performance. Moreover, the wavelength of the filter can be adjusted through the geometric size of the resonant cavity or the dielectric medium with different reflective indexes in the resonant cavity, i.e. the filter of any wavelength can be realized by manufacturing different devices in different sizes or filling different dielectric media with different reflective indexes on the device, and the application range of the device can be greatly enlarged.

Description

technical field [0001] The present invention relates to an optical filtering device, and more specifically, to a surface plasmon optical waveguide filter. Background technique [0002] In recent years, the size of electronic integrated circuit (circuit) circuit (IC) has been rapidly reduced according to the speed expected by Moore's law, and its unit devices have achieved breakthroughs in the scale of tens of nanometers in the laboratory. Due to physical limitations such as the inherent chargeability, bandwidth, heat consumption, and thermoelectric crosstalk of electronics, the size and integration of electronic ICs have almost reached their theoretical limits, making it difficult to make further breakthroughs. On the contrary, photonic integrated circuits are not restricted by these factors at all in theory, and have excellent performances such as extremely high bandwidth, response speed, and high immunity that electronic ICs cannot match. However, as the basic components ...

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Problems solved by technology

The research on SPPs has obtained exciting results in other fields such as nano-metal pinhole array structure transmission enhancement, nano-optical imaging, nano-lithography and high-sensitivity biochemical sensing, but it has controllable functions in light wave transmission and optical information processing. The progress in nano-optoelectronic devices and other aspects is very limited, which is far from meeting the application requirements of research and development of high-function nano-integrated optoelectronic devices.

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