Optical beam splitter based on non-periodic sub-wavelength grating and design method thereof

Abstract

The invention, which belongs to the technical field of optoelectronics, discloses an optical beam splitter based on a non-periodic sub-wavelength grating and a design method thereof. The method comprises: establishing a three-dimensional coordinate system; forming a non-periodic grating basic unit by one-dimensional, two-dimensional and three-dimensional gratings; and extending the grating basic unit periodically to form an optical beam splitter having two deflection angles. Therefore, the light beam splitting in a vertical direction is realized; only power beam splitting is carried out; and the sub beam-splitting light can be kept in an incident light state. The grating basic unit formed based on the grating block structure is arranged periodically to form any one-dimensional, two-dimensional and three-dimensional grating; and the infinite extension is realized.

Description

technical field [0001] The invention belongs to the technical field of optoelectronics, in particular to an optical beam splitter based on an aperiodic sub-wavelength grating and a design method thereof. Background technique [0002] With the continuous development of the information age, the miniaturization and integration of optoelectronic devices and optical systems has become the goal that people are constantly pursuing. The sub-wavelength structure of optical devices has attracted widespread attention due to its unique optical properties brought about by its unique geometric characteristics. Various sub-wavelength optical devices with excellent performance have greatly promoted the development of optoelectronics towards micro-nano and integrated . Optical beam splitters with unique and excellent properties are also one of the important devices in the field of optoelectronics. [0003] Optical devices with subwavelength structures, typically represented by subwavelengt...

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Problems solved by technology

[0004] Classical optical beam splitters use semi-transparent mirrors to split transmitted light and reflected light; waveguide beam splitters use planar waveguides to split beams on a plane; beam splitters based on subwavelength gratings can split light in the vertical direction. Beam splitting, but generally sub-wavelength grating beam splitters use deflection gratings to deflect two parts of light in two directions, which cannot maintain the overall shape of the incident light. Although power splitting can be achieved, it will split the shape of the incident spot

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