Magnetic Control of Surface Plasmon Propagation
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Solution Overview
Problem
Current technologies face challenges in controlling and guiding surface states, such as surface plasmon polaritons, across material boundaries without the need for separate path-defining structures, particularly in controlling their propagation and coupling between different dielectric regions.
Innovation Solution
A method and apparatus utilizing a spatially-varying magnetic field to induce and control surface states by creating a spatially-varying permittivity, allowing for independent control of surface state propagation without relying on separate path-defining structures, and varying magnetic fields to steer or block surface states across material interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate path-defining structures are used to guide surface states, then propagation control is achieved, but device complexity increases
Solution Approach 1:
The patent extracts the path-defining function from separate physical structures and transfers it to the magnetic field configuration itself. The magnetic field gradient directly defines the propagation path of surface states without requiring additional waveguide structures, thereby eliminating the need for separate path-defining components while maintaining precise propagation control.
Solution Approach 2:
The magnetic field serves multiple functions simultaneously: it defines the propagation path, controls the surface state confinement, and enables dynamic switching between different propagation paths. This multi-functionality eliminates the need for separate structural components for each function, reducing overall device complexity while maintaining operational control.
2Ease of operation
If material boundaries are used to confine surface states, then propagation control is achieved, but coupling efficiency between dielectric regions decreases
Solution Approach 1:
The patent changes the confinement mechanism from relying on material boundary properties (dielectric constants) to using magnetic field gradient parameters. By adjusting the magnetic field strength and gradient, the surface state confinement and coupling can be optimized independently of material boundaries, enabling efficient coupling between dielectric regions while maintaining precise propagation control.
3Ease of operation
If spatially-varying magnetic fields are applied to control surface states, then propagation control improves, but energy consumption increases
Solution Approach 1:
The patent applies spatially-varying magnetic fields only in the specific regions where surface state control is needed, rather than uniformly across the entire system. The magnetic field gradient is concentrated at the interface or propagation path, allowing efficient local control of surface states while minimizing energy consumption in other regions of the system.
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
Enables precise control and manipulation of surface states, including steering and blocking, across material boundaries, enhancing the propagation and coupling of surface modes between different dielectric regions, thereby improving the efficiency and flexibility of surface state management.
Implementation Method 1
a first magnetically responsive structure interposed at a first central location intermediate the input location and the output location, the first magnetically responsive structure being responsive to a spatially-varying magnetic field to produce a spatially-varying permittivity proximate to the first surface state support
Data Source
AI summary
A magnetic field may be applied to a plasmon path to affect plasmon propagation.