VCSEL Nanostructure Reflector for Thermal and Optical Control
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Solution Overview
Problem
Vertical cavity surface-emitting lasers (VCSELs) face challenges in improving light emission and control characteristics due to the limitations of distributed Bragg reflectors, such as high thermal resistance and reduced thermal conductivity, which affect their performance and efficiency.
Innovation Solution
Incorporating a nanostructure reflector with subwavelength dimension anisotropic nanoelements, arranged to emit circularly polarized laser light, which can act as a concave mirror to enhance light emission and control characteristics, while reducing the thermal resistance by using a support layer with a lower refractive index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a distributed Bragg reflector (DBR) is used to achieve high reflectivity, then light control characteristics are improved, but thermal resistance increases and thermal conductivity decreases
Solution Approach 1:
The patent changes the structural parameters of the reflector by transitioning from a conventional DBR with multiple laminated layers to a nanostructure reflector with subwavelength periodic structures. This parameter change maintains high reflectivity while improving thermal conductivity by eliminating phonon scattering at material boundaries, thus resolving the contradiction between light control and thermal management
Solution Approach 2:
The patent employs composite material structures in the nanostructure reflector, combining materials with different optical and thermal properties. The subwavelength periodic composite structure achieves high reflectivity through optical interference while maintaining low thermal resistance through continuous thermal pathways, resolving the contradiction between optical performance and thermal management
2Measurement precision
If a distributed Bragg reflector (DBR) is used to achieve high reflectivity, then light emission characteristics are improved, but the device complexity increases due to multiple laminated structures
Solution Approach 1:
The patent segments the reflector structure into subwavelength periodic units with specific geometric patterns. This segmentation approach achieves high reflectivity through collective optical interference of multiple small elements, reducing the overall complexity compared to conventional DBR while maintaining superior light emission characteristics
Solution Approach 2:
The patent transitions from a one-dimensional laminated DBR structure to a two-dimensional or three-dimensional nanostructure arrangement with subwavelength periodicity. This dimensional change enables high reflectivity through spatial periodicity in the plane, significantly reducing the number of layers required and simplifying the overall device structure
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 nanostructure reflector improves the light emission and control characteristics of VCSELs, enhancing the intensity and wavefront profile of the emitted light, and reduces thermal resistance, leading to more efficient and stable operation.
Implementation Method 1
the plurality of nanostructures include a plurality of anisotropic nanoelements and are configured to emit a circularly polarized laser light through the nanostructure reflector based on distributions and arrangement directions of the plurality of anisotropic nanoelements
Implementation Method 2
a nanostructure reflector with subwavelength dimension anisotropic nanoelements, arranged to emit circularly polarized laser light
Implementation Method 3
which can act as a concave mirror to enhance light emission and control characteristics, improving the intensity and wavefront profile of the emitted light
Implementation Method 4
reduces the thermal resistance by using a support layer with a lower refractive index
Implementation Method 5
The DBR has a relatively low thermal conductivity or a relatively high thermal resistance due to phonon scattering occurring at a boundary of two materials
Data Source
AI summary
Vertical cavity surface-emitting lasers (VCSELs) includes a vertical cavity surface-emitting laser including a gain layer configured to generate light, a distributed Bragg reflector disposed on a first surface of the gain layer, and a nanostructure reflector disposed on a second surface of the gain layer opposite from the first surface, the nanostructure reflector including a plurality of nanostructures having a sub-wavelength dimension, wherein the plurality of nanostructures include a plurality of anisotropic nanoelements and are configured to emit a circularly polarized laser light through the nanostructure reflector based on distributions and arrangement directions of the plurality of anisotropic nanoelementss.