Light-emitting device with asymmetric phase modulation layer
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Solution Overview
Problem
Conventional light-emitting devices that control phase and intensity spectra to output arbitrary optical images face challenges in reducing unnecessary 1st-order and -1st-order light, which can be detrimental depending on the application.
Innovation Solution
A light-emitting device with a phase modulation layer having modified refractive index regions arranged in a three-dimensional shape with inclined surfaces, where at least one surface is inclined with respect to the main surface, allowing for selective attenuation of either 1st-order or -1st-order light by scattering or reflecting these beams differently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a phase modulation layer with modified refractive index regions is used to output arbitrary optical images in inclined directions, then the optical image formation capability is improved, but unnecessary 1st-order and -1st-order light cannot be reduced
Solution Approach 1:
The patent introduces asymmetric inclined surfaces in the modified refractive index regions. Specifically, the side surfaces are inclined at a first angle in a first direction and a second angle in a second direction, where the angles are different. This asymmetry causes the 1st-order light and -1st-order light to be scattered or reflected in different directions, enabling selective attenuation of one order while maintaining the other, thus resolving the contradiction between optical image formation capability and reduction of unnecessary light
Solution Approach 2:
The patent applies different inclination angles to different surfaces of the modified refractive index regions. The first surface may have a first inclination angle and the second surface may have a second inclination angle, creating local variations in optical properties. This local quality differentiation allows specific control over the scattering and reflection directions of 1st-order and -1st-order light, enabling selective attenuation while preserving desired optical image formation
2Ease of manufacture
If conventional phase modulation structures are used, then manufacturing is simpler, but the ability to selectively reduce one light with respect to the other is insufficient
Solution Approach 1:
The patent controls the inclination angles of the side surfaces as key parameters. By setting the first angle and second angle within specific ranges, the patent achieves precise control over the scattering and reflection directions of 1st-order and -1st-order light. This parameter-based control method allows for manufacturable solutions that achieve the desired light attenuation precision without requiring overly complex manufacturing processes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively reduces one light with respect to the other, optimizing light output by varying the optical path lengths and scattering/reflection directions of 1st-order and -1st-order light, enhancing the desired optical image formation.
Implementation Method 1
allowing for selective attenuation of either 1st-order or -1st-order light by scattering or reflecting these beams differently
Implementation Method 2
allowing for selective attenuation of either 1st-order or -1st-order light by scattering or reflecting these beams differently
Implementation Method 3
The phase modulation layer has a base layer and a plurality of modified refractive index regions each of which has a refractive index different from a refractive index of the base layer
Data Source
AI summary
The present embodiment relates to a light-emitting device or the like having a structure capable of reducing one power of ±1st-order light with respect to the other power. The light-emitting device includes a substrate, a light-emitting portion, and a phase modulation layer including a base layer and a plurality of modified refractive index regions. Each of the plurality of modified refractive index regions has a three-dimensional shape defined by a first surface facing the substrate, a second surface positioned on a side opposite to the substrate with respect to the first surface, and a side surface. In the three-dimensional shape, at least one of the first surface, the second surface, and the side surface has a portion inclined with respect to a main surface.