360-degree full field-of-view angle diffractive optical element and method for designing same

Abstract

The invention relates to a 360-degree full field-of-view angle diffractive optical element and a method for designing the same. The diffractive optical element comprises a substrate layer and a plurality of nanometer bricks etched and arranged periodically on the working surface of the substrate layer. The substrate layer can be divided into a plurality of unit structures corresponding to the nanometer bricks. The unit structures have the same length, width, and height. Each individual unit structure has a square working surface with a side length of 400nm. All the nanometer bricks have the same size. The length, the width, and the height of each nanometer brick are 200nm, 120nm, and 310nm respectively and are all sub-wavelength scales. The nanometer bricks are arranged on the corresponding unit structures with different orientation angles, wherein each different orientation angle is half of the phase of the corresponding nanometer brick. The diffractive optical element ingeniously utilizes the geometrical phase and the electromagnetic resonance effect of a nanometer brick array material, realizes a simultaneous front and back transmission function which cannot be realized by a traditional diffractive optical element, expands the reachable range of diffracted light, and realizes half transmission energy and half reflection energy in a specific wavelength and precise and continuous phase control.

Description

technical field [0001] The invention belongs to the field of micro-optics, and in particular relates to a 360° full field angle diffractive optical element and a design and realization method thereof. Background technique [0002] Diffractive Optical Elements (DOEs) are a class of optical elements that work on the principle of diffraction. Traditional diffractive optical elements control the phase of incident light by etching relief structures of different depths on transparent dielectric materials, and are ultimately used to make optical devices based on phase regulation. The diffraction angle that the incident light can expand after passing through the diffractive optical element is an important index to evaluate its performance. But generally speaking, diffracted light can only be transmitted or reflected, that is, one of the two working modes, which limits the actual reachable range of diffracted light, and is widely used in light sensing, lidar, somatosensory, light di...

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Problems solved by technology

But generally speaking, diffracted light can only be transmitted or reflected, that is, one of the two working modes, which limits the actual reachable range of diffracted light, and is widely used in light sensing, lidar, somatosensory, light display and other fields. will be very restricted

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