A Diffraction Grating-Based Multi-Wavelength Spatial Light Field Differential Operation Device

A diffraction grating and spatial light field technology, applied in digital differential analyzers, complex mathematical operations, calculations using non-numerical representations, etc., can solve problems such as a single wavelength, achieve small device size, simple structure design, and large-scale Quantitative Space Light Field Information Processing and Effect of Image Edge Extraction

Active Publication Date: 2020-12-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiency that the above-mentioned technology can only work at a single wavelength, the present invention proposes a multi-wavelength spatial light field differential operation device based on a diffraction grating

Method used

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  • A Diffraction Grating-Based Multi-Wavelength Spatial Light Field Differential Operation Device
  • A Diffraction Grating-Based Multi-Wavelength Spatial Light Field Differential Operation Device
  • A Diffraction Grating-Based Multi-Wavelength Spatial Light Field Differential Operation Device

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Embodiment 1

[0028] As shown in Fig. 1(a), it is an embodiment of a reflective multi-wavelength spatial light field differential operation device based on a diffraction grating, which includes sequentially stacked from top to bottom: a spatial frequency coupling layer, a waveguide layer, and a reflective layer. The spatial frequency coupling layer uses a diffraction grating. The input coherent light is input to the multi-wavelength spatial light field differentiator from the side of the spatial frequency coupling layer in the air, and after the phase matching of the diffraction grating excites the waveguide mode in the dielectric waveguide layer, it is output to a certain non-zero order diffraction of the diffraction grating . The input and output are on the same side of the device and are reflective devices.

[0029] Such as figure 2As shown, the spatial frequency coupling layer of the multi-wavelength spatial light field differential operation device uses a diffraction grating. The mat...

Embodiment 2

[0035] As shown in Figure 1(b), it is an embodiment of a transmissive multi-wavelength spatial light field differential operation device based on a diffraction grating, including sequentially stacked from top to bottom: input side spatial frequency coupling layer, waveguide layer, output Side spatial frequency coupling layer. The input side spatial frequency coupling layer uses a prism, and the output side spatial frequency coupling layer uses a diffraction grating. The input coherent light is coupled into the multi-wavelength spatial light field differentiator from the air through a prism, and after the phase matching of the prism excites the waveguide mode in the dielectric waveguide layer, it is output to a certain non-zero order diffraction of the diffraction grating. The input and output are located on different sides of the device, which is a transmissive device.

Embodiment 3

[0037] As shown in Figure 1(c), it is an embodiment of a transmissive multi-wavelength spatial light field differential operation device based on a diffraction grating, including sequentially stacked from top to bottom: input side spatial frequency coupling layer, waveguide layer, output Side spatial frequency coupling layer. The input-side spatial frequency coupling layer and the output-side spatial frequency coupling layer use diffraction gratings with different periods. The input coherent light is coupled from the air to the multi-wavelength spatial light field differentiator through the diffraction grating, and after the phase matching of the diffraction grating excites the waveguide mode in the dielectric waveguide layer, it is output to a certain non-zero order diffraction of the output side diffraction grating. The input and output are located on different sides of the device, which is a transmissive device.

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Abstract

The invention discloses a multi-wavelength space light field differential operation device based on a diffraction grating, and belongs to the field of optical information processing. The spatial lightfield differentiator designed by the invention has the advantages of capability of simultaneously working at multiple wavelengths, simple design, micro-nano device thickness, easiness in large-scalepreparation, capability of being integrated with a silicon-based device and the like. According to the invention, the waveguide mode in the dielectric waveguide layer is excited, and the transfer function of the device is linear, so that first-order differential processing is carried out on an input space light field. According to the invention, a plurality of different waveguide modes can be correspondingly excited at a plurality of wavelengths at the same time, and first-order spatial differential operation of a light field can be realized at the plurality of wavelengths at the same time. The multi-wavelength space light field differential operation device can be used for ultra-fast, real-time and large-flux image processing such as edge extraction, and has important technical application prospects in medical and satellite image processing.

Description

technical field [0001] The invention relates to the field of optical information processing, in particular to a spatial light field differential operation device based on a diffraction grating. Background technique [0002] With the rapid development of information technology, the demand for information processing performance is constantly increasing. Compared with the information processing methods of traditional electronic devices, optical information processing technology has gradually developed into an important information processing method by virtue of its advantages of high speed, ultra-large bandwidth, and low loss. Traditional Fourier optical information processing utilizes the Fourier transform characteristics of the lens to form a 4f system through two lenses, select a suitable spatial filter on its spectrum plane, and perform light field simulation operations to realize image processing. Among them, the use of spatial light field differential calculation can rea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F7/64G06F17/15G06T7/12
CPCG06F7/64G06F17/15G06T2207/10052G06T2207/20192G06T7/12
Inventor 阮智超方轶圣周祎晗
Owner ZHEJIANG UNIV
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