Surface Plasmon Polariton Modulator With Tunable Dielectric
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Solution Overview
Problem
Current surface plasmon polariton technologies lack the ability to effectively control the traveling direction, intensity, and phase of surface plasmons using electric signals, which is essential for realizing integrated optoelectronic circuits without the need for external light sources.
Innovation Solution
A surface plasmon polariton modulator is designed with alternating dielectric portions between metal layers, where the refractive index of these dielectric portions varies with an electric field, allowing for control of surface plasmon propagation by applying electric, magnetic, or mechanical fields, and incorporating a sensor array for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If optical methods are used to generate surface plasmons, then surface plasmons can be strongly and resonantly generated, but additional external light sources are required which are not appropriate for integrated circuits
Solution Approach 1:
The patent replaces optical methods (electromagnetic field) with electrical methods (electric field) for generating and controlling surface plasmons. The modulator uses voltage applied to metal layers to control the dielectric constant of the dielectric layer, thereby controlling surface plasmon generation and propagation without requiring external light sources, enabling integration with electronic circuits
Solution Approach 2:
The patent changes the physical parameter of the dielectric layer by varying its dielectric constant through voltage application. The dielectric constant is changed from a fixed value to a voltage-tunable value, allowing electrical control of surface plasmon properties such as propagation constant, frequency, and mode, thereby enabling integration with electronic control circuits
2Extent of automation
If a surface plasmon polariton modulator is to control surface plasmon propagation using electric signals, then integration with optoelectronic circuits is enabled, but the ability to effectively control traveling direction, intensity, and phase is currently lacking
Solution Approach 1:
The patent divides the dielectric layer into multiple regions with different dielectric constants (first dielectric region with constant k1 and second dielectric region with constant k2). This segmentation allows independent control of different sections of the surface plasmon path, enabling precise control of propagation direction, intensity, and phase by applying different voltages to different metal layer regions
Solution Approach 2:
The patent makes the dielectric constant dynamic by allowing it to change with applied voltage. The metal layers are configured as electrodes that can apply variable voltage to the dielectric layer, making the surface plasmon propagation characteristics dynamically controllable in real-time, enabling functions such as switching, modulation, and beam steering
3Illumination intensity
If the wavelength of light is about 102 nm to about 103 nm, then optical elements can operate, but the wavelength is much greater than the size of high-integration electronic circuit elements, reducing integration
Solution Approach 1:
The patent replaces optical wavelength-scale components with electrical voltage-scale control mechanisms. By using voltage to control the dielectric constant and thereby control surface plasmon properties, the system achieves optical functionality with electrical control signals that are compatible with standard electronic circuit dimensions, enabling co-integration of optical and electronic functions at the same scale
Solution Approach 2:
The patent changes the operating parameter from fixed optical wavelength to voltage-tunable surface plasmon frequency and wavevector. This allows the effective wavelength to be compressed to the scale of electronic circuits through the surface plasmon confinement effect, while maintaining optical-frequency operation, thereby enabling high-density integration
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 active control over the propagation path, transmissivity, and intensity of surface plasmons, allowing the modulator to function as a scanner, multiplexer, demultiplexer, or intensity controller, facilitating the integration of surface plasmon-based optoelectronic circuits.
Implementation Method 1
the refractive index of these dielectric portions varies with an electric field, allowing for control of surface plasmon propagation by applying electric, magnetic, or mechanical fields
Data Source
AI summary
A surface plasmon polariton modulator capable of locally varying a physical property of a dielectric material to control a surface plasmon polariton. The surface plasmon polariton modulator includes a dielectric layer, including first and second dielectric portions, which is interposed between two metal layers. The second dielectric portion has a refractive index which varies with an electric field, a magnetic field, heat, a sound wave, or a chemical and/or biological operation applied thereto. The surface plasmon polariton modulator is configured to control one of an advancing direction, an intensity, a phase, or the like of a surface plasmon using an electric signal. The surface plasmon polariton modulator can operate as a surface plasmon polariton multiplexer or a surface plasmon polariton demultiplexer.