Quantum-Well Nanorod Optical Amplifier for Coherent Light Output
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Solution Overview
Problem
Existing optical devices face challenges in efficiently emitting and directing light along a specific output path, particularly in achieving coherent stimulated light emission and optimizing light transmission through optical interfaces.
Innovation Solution
The optical device comprises a substrate with a plurality of light emitters, each having a quantum well and a refractive index higher than the surrounding environment. The light emitters are arranged as nanorods or nanowalls, with specific spacing and optical interfaces designed to enhance light emission and transmission along the output path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light emitters are arranged with specific spacing of about λn/2 along the output path, then coherent stimulated light emission is achieved, but the device complexity increases due to precise positioning requirements
Solution Approach 1:
The light source is segmented into multiple discrete light emitters (nanorods or nanowalls) arranged along the output path. Each emitter is spaced at approximately λn/2 intervals, creating a segmented structure that enables coherent stimulated emission while maintaining manufacturable precision through standardized spacing units
Solution Approach 2:
The spacing between light emitters is optimized to a specific parameter value of about λn/2, where λ is the wavelength of output light and n is a natural number. This parameter change from arbitrary spacing to wavelength-dependent spacing enables coherent stimulated emission by matching the optical path differences to constructive interference conditions
2Productivity
If the downstream optical interface is shaped to increase light transmission, then light transmission efficiency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The downstream optical interface is shaped asymmetrically with respect to the upstream interface, creating a wedge-like or angled configuration that favors light transmission in the forward direction. This asymmetric shaping increases transmission efficiency by reducing reflection and improving coupling, while the gradual transition minimizes manufacturing difficulty compared to sharp geometric changes
3Productivity
If support material with lower refractive index is used to reduce total internal reflection, then light emission efficiency is improved, but the material selection and interface design complexity increases
Solution Approach 1:
The support material is specifically selected to have a refractive index lower than the light emitters only in the regions where light extraction is critical, while maintaining mechanical support functionality. This local optimization of refractive index matching creates favorable conditions for light emission at the emitter-support interfaces without requiring the entire structure to use specialized materials
Solution Approach 2:
The support material acts as an intermediary between the high-refractive-index light emitters and the lower-refractive-index external environment. By positioning the support material with intermediate optical properties between the emitters and air, it serves as an optical mediator that reduces total internal reflection at the emitter boundaries while maintaining structural integrity
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 configuration enables coherent stimulated light emission, improves light transmission, and allows for control over the direction of light emission, enhancing the overall efficiency and functionality of the optical device.
Implementation Method 1
each comprising a quantum well to emit the output light when the light emitter is electrically biased
Implementation Method 2
each having a refractive index higher than a corresponding refractive index of an environment outside of and abutting the light emitters
Implementation Method 3
the light emitters each having a refractive index higher than a corresponding refractive index of an environment outside of and abutting the light emitters
Implementation Method 4
the downstream optical interface may be shaped to increase a transmission of the output light through the downstream optical interface
Data Source
AI summary
There is provided an optical device to amplify an input light propagating along an optical path. The light source includes a substrate, and light emitters disposed on the substrate in the optical path. The light emitters each have a footprint on the substrate and extend away from the substrate laterally to the optical path. The light emitters each include a quantum well to emit an emitted light when the light emitter is electrically biased and exposed to the input light. The emitted light from the light emitters is to form an output light having an amplitude greater than a corresponding amplitude of the input light. Each pair of neighboring light emitters may be spaced from one another along the output path by a distance being about (q+¼)∧, where ∧ is the wavelength of the output light and q is an integer greater than or equal to zero.