Vertical Microcavity Sub-Wavelength Confinement for High Q Factor
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Solution Overview
Problem
Vertical microcavity designs face challenges in achieving high Q factor and low mode volume simultaneously, which are essential for maximizing light-matter interactions in applications like lasing and nonlinear optical processes, due to limitations in light confinement and scattering losses.
Innovation Solution
A vertical microcavity with a confinement region comprising a single layer material structured to create an effective refractive index variation using 2D lithographic methods, allowing for sub-wavelength structures that confine electromagnetic waves and achieve desired Q factor values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional light confinement structures (disk-shaped, mesa, or 3D-shaped defects) are used, then light confinement is achieved, but Q factor remains low (less than 10^4) or fabrication complexity increases
Solution Approach 1:
The invention changes the geometric parameters of the confinement structures by using sub-wavelength periodic patterns instead of conventional large-scale defects. This parameter change enables high Q factor (up to 10^5) while maintaining compatibility with standard 2D lithography processes, avoiding the need for complex 3D lithography or etching
Solution Approach 2:
The invention introduces local quality variations through sub-wavelength periodic structures within the confinement region. These localized sub-wavelength features create effective refractive index modulation that enhances light confinement and Q factor without requiring complex global structural changes or 3D fabrication
2Loss of energy
If conventional confinement structures are used, then light confinement is achieved, but scattering losses increase and mode volume increases
Solution Approach 1:
By changing the scale parameter to sub-wavelength dimensions, the invention reduces scattering losses significantly. The sub-wavelength periodic structures create effective medium behavior that minimizes diffraction and scattering, enabling low loss while maintaining small mode volume for enhanced light-matter interaction
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 solution enables the attainment of high Q factor values (up to 10^5) and low mode volumes, enhancing light-matter interactions and reducing scattering losses, making it suitable for applications such as multi-channel laser arrays and VCSELs.
Implementation Method 1
The confinement region comprises a single layer material, which is structured so as to create an effective refractive index variation for the electromagnetic wave to be confined
Data Source
AI summary
Embodiments are notably directed to a vertical microcavity. The vertical microcavity includes a first reflector and a second reflector, each of which includes one or more material layers extending perpendicular to a vertical axis x. The cavity may further include a confinement region extending between the first reflector and the second reflector, so as to be able to confine an electromagnetic wave. The confinement region may include a single layer material, which is structured so as to create an effective refractive index variation for the electromagnetic wave to be confined, in an average plane of the single layer material, perpendicularly to said vertical axis x. Additional examples are further directed to related microcavity systems and methods of fabrication.