Quantum Well Light Modulator With DBR Layers for Low-Loss Beam Steering
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Solution Overview
Problem
Existing light modulators face challenges with increased volume and cost due to mechanical motion, complexity in optical phased array methods, and high optical losses in Fabry-Perot resonator structures, which affect their efficiency and operational speed.
Innovation Solution
A light modulator design incorporating a quantum dot active layer with a distributed Bragg reflector (DBR) structure, where the DBR layers have different refractive indices and a quantum well structure with quantum dots, allowing for saturation gain and efficient phase modulation of incident light, along with a processor to control refractive index and gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Fabry-Perot resonator structure with a great resonance structure is used for high phase modulation, then phase modulation capability is improved, but optical losses are increased which decreases light modulator efficiency
Solution Approach 1:
The patent changes the material parameter of the active layer from conventional semiconductor materials to quantum dot materials. This parameter change enables achieving the necessary gain for high phase modulation while reducing optical losses, as quantum dots provide higher gain efficiency per unit volume compared to traditional semiconductor materials.
Solution Approach 2:
The patent employs a composite structure combining quantum dot active layer with distributed Bragg reflectors (DBR). This composite material approach allows the system to achieve both high reflectivity for phase modulation and low optical losses, as the quantum dots provide gain while the DBR structure minimizes transmission losses.
2Ease of operation
If MEMS structure with mechanical motion is used for light modulation, then light control capability is improved, but device volume is increased causing increased expense
Solution Approach 1:
The patent replaces the mechanical motion system of MEMS with a quantum optical system. Instead of using mechanically moving mirrors or modulators, the invention uses quantum dot-based optical gain and interference effects to achieve light modulation, thereby eliminating the need for mechanical components and reducing device volume.
Solution Approach 2:
The patent utilizes quantum phase transitions and optical interference phenomena in the quantum dot active layer to achieve light modulation. By controlling the quantum states and phase relationships in the active layer, the system can modulate light without any mechanical motion, thus avoiding the volume and cost issues associated with MEMS.
3Ease of operation
If optical phased array method is used for beam control, then beam steering capability is improved, but circuit complexity is increased which increases process costs
Solution Approach 1:
The patent creates a universal quantum light modulator that can perform multiple functions including phase modulation, amplitude modulation, and beam steering control through a single integrated quantum dot active layer structure. This multi-functional approach eliminates the need for separate driving pixels and pixel operators required in traditional optical phased array methods, thereby reducing circuit complexity.
Solution Approach 2:
The patent merges the functions of multiple separate optical components into a single quantum light modulator device. By combining phase modulation, amplitude control, and beam steering capabilities in one integrated quantum structure, the system eliminates the complex circuitry needed to coordinate multiple independent components.
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 design enhances light intensity amplification and phase modulation, reducing optical losses and increasing efficiency while maintaining low complexity and cost, enabling precise control of light direction.
Implementation Method 1
a light modulator for amplifying an intensity of incident light and modulating a phase of the incident light
Implementation Method 2
an active layer disposed between the first DBR layer and the second DBR layer, and comprising a quantum well structure
Implementation Method 3
a first distributed Bragg reflector (DBR) layer having a first reflectivity and comprising at least two first refractive index layers that have different refractive indices from each other and are repeatedly alternately stacked
Implementation Method 4
a light modulator for amplifying an intensity of incident light and modulating a phase of the incident light
Data Source
AI summary
A light modulator for amplifying an intensity of incident light and modulating a phase of the incident light is provided. The light modulator includes: a first distributed Bragg reflector (DBR) layer having a first reflectivity and comprising at least two first refractive index layers that have different refractive indices from each other and are repeatedly alternately stacked; a second DBR layer having a second reflectivity and comprising at least two second refractive index layers that have different refractive indices from each other and are repeatedly alternately stacked; and an active layer disposed between the first DBR layer and the second DBR layer, and comprising a quantum well structure.