Resonant Leaky-Mode Photonic Elements for Spectral Control
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Solution Overview
Problem
Current optical devices based on homogeneous layer stacks require a large number of layers to achieve desired spectral and angular properties, leading to material and cost inefficiencies, adhesion difficulties, and interface scattering losses.
Innovation Solution
The use of resonant leaky-mode optical devices with a single layer or multiple layers featuring periodic structures that exploit first and higher-order evanescent diffraction orders, allowing for arbitrary material distribution and asymmetric profiles to control spectral characteristics, enabling flexible design and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If homogeneous layer stacks are used to achieve desired spectral and angular properties, then the optical performance can be achieved, but a large number of layers (10-200) are required leading to material and cost inefficiencies
Solution Approach 1:
The patent combines multiple homogeneous layers into a single periodically modulated layer that achieves the same optical performance. The periodic structure integrates the functionality of multiple layers into one layer with spatially varying refractive index, reducing the total layer count from 10-200 layers to just one or a few periodic layers.
Solution Approach 2:
The patent changes the refractive index parameter spatially within a single layer to create periodic modulation. By varying the refractive index periodically across the layer thickness, the structure achieves complex spectral control that previously required many homogeneous layers, thereby simplifying the device while maintaining performance.
2Reliability
If homogeneous layer stacks are used, then spectral control can be achieved, but adhesion difficulties associated with forming multilayered stacks occur
Solution Approach 1:
The patent merges multiple layers that would require sequential deposition and adhesion into a single periodically modulated layer. This eliminates the adhesion interfaces between layers, removing the adhesion difficulties entirely while preserving spectral control through the periodic refractive index modulation.
3Reliability
If multilayered arrangements are used, then spectral properties can be achieved, but interface scattering losses are inherently associated
Solution Approach 1:
The patent eliminates interface scattering losses by merging multiple layers into a single periodic layer. Without interfaces between layers, there are no scattering losses at boundaries, while spectral properties are maintained through the periodic modulation of the refractive index within the continuous layer.
4Loss of substance
If a single layer with periodic structure is used, then material usage is reduced, but precise control over spectral characteristics requires complex periodic modulation
Solution Approach 1:
The patent uses periodic changes in the refractive index parameter within a single layer to achieve precise spectral control. The periodic modulation of this physical parameter enables complex spectral characteristics to be obtained with minimal material, trading parameter complexity for material efficiency.
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 allows for the creation of optical devices with precise control over resonance wavelengths and interaction spectral ranges, producing wideband shaped spectra and rivaling the performance of more complex multilayer devices while reducing material usage and fabrication challenges.
Implementation Method 1
The use of resonant leaky-mode optical devices with a single layer or multiple layers featuring periodic structures that exploit first and higher-order evanescent diffraction orders
Implementation Method 2
resonant leaky-mode optical devices with a single layer or multiple layers featuring periodic structures
Data Source
AI summary
Optical devices with versatile spectral attributes are provided that are implemented with one or more modulated and homogeneous layers to realize leaky-mode resonance operation and corresponding versatile spectral-band design. The first and/or higher multiple evanescent diffraction orders are applied to excite one or more leaky modes. The one- or two-dimensional periodic structure, fashioned by proper distribution of materials within each period, can have a resulting symmetric or asymmetric profile to permit a broadened variety of resonant leaky-mode devices to be realized. Thus, the attributes of the optical device permit, among other things, adjacent, distinct resonance frequencies or wavelengths to be produced, convenient shaping of the reflection and transmission spectra for such optical device to be accomplished, and the wavelength resonance locations to be precisely controlled so as to affect the extent to which the leaky modes interact with each other. Further, the profile asymmetry allows for the precise spectral spacing of interactive leaky modes so as to provide greater flexibility in optical device design.