Quantum Dot Output Couplers for High-Speed Light Modulation
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Solution Overview
Problem
Conventional optical modulators have slow operation response times due to their driving methods, limiting their ability to quickly control optical characteristics in light emission and modulation devices.
Innovation Solution
The use of quantum dots (QDs) in conjunction with nano-antenna structures and refractive index change layers allows for rapid modulation of light emission characteristics, enabling high-speed control of optical properties through changes in refractive index and electrical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional optical modulators use mechanical movement of light blocking/reflection elements, then optical modulation can be achieved, but operation response time becomes slow (over several microseconds)
Solution Approach 1:
The patent replaces mechanical movement of light blocking/reflection elements with quantum dot-based photoluminescence modulation. Instead of mechanically moving parts to modulate light, the invention uses electrical excitation of quantum dots to control light emission intensity and wavelength, achieving fast response times without mechanical complexity
Solution Approach 2:
The patent changes the operational parameters from mechanical position control to electrical excitation control. By applying different voltages to the quantum dots, the photoluminescence intensity and emission wavelength can be dynamically adjusted, enabling fast optical modulation without mechanical movement
2Productivity
If quantum dots are used with nano-antenna structures and refractive index change layers, then modulation speed and efficiency are improved, but device structure becomes more complex
Solution Approach 1:
The patent integrates multiple functions into a single quantum dot layer structure. The quantum dots simultaneously provide light emission, wavelength selection through size control, and modulation capability through electrical excitation. The nano-antenna structures serve multiple purposes including light extraction enhancement and directional control, reducing the need for separate components
Solution Approach 2:
The patent uses quantum dots with different sizes and compositions at different locations to achieve wavelength-specific emission. By controlling the spatial distribution and properties of quantum dots, the device can independently modulate multiple wavelength regions with localized control, enabling high-speed modulation without requiring complex global control mechanisms
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
This approach enables fast and efficient modulation of light emission, improving luminous and modulation efficiency while allowing for independent control of light beams across multiple wavelength regions, enhancing the performance of light emission and optical modulation devices.
Implementation Method 1
a first quantum dot layer A10 having first quantum dots QD1 having light emission characteristics
Implementation Method 2
a refractive index change layer R10 in which a refractive index is changed according to an applied voltage
Data Source
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AI summary
Provided are light emission devices including an output coupler and optical apparatuses having the same. The light emission device may include a QD layer containing quantum dots and a nano-antenna structure including an output coupler configured to control an output characteristic of light emitted from the QD layer. The output coupler may be configured to output an emission wavelength of the QD layer. The nano-antenna structure may include one of a metallic antenna, a dielectric antenna, and a slit-containing structure, or may have a multi-patch antenna structure or a fishbone antenna structure.