Meta-Surface Electron Emitter for Polarity Detection
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Solution Overview
Problem
Current electromagnetic wave detection systems cannot measure the electric field strength of electromagnetic waves for each polarity with a simple configuration, requiring complex optical systems and additional components like lasers for terahertz-wave detection.
Innovation Solution
A photoelectric conversion device with a meta-surface electron emitter and a potential control unit that switches electric potentials to control the electric field direction, allowing for the emission of electrons based on the polarity of the incoming electromagnetic wave, enabling measurement of electric field strength for each polarity without additional complex systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electro-optic sampling using terahertz time-domain spectroscopy is used to detect the waveform of terahertz wave, then the electric field strength of the electromagnetic wave can be measured for each polarity, but the system requires an incidence of laser beam in addition to the electromagnetic wave and requires a complicated optical system using a prism, a mirror and a lens
Solution Approach 1:
The patent extracts the essential function of polarity detection from the complex electro-optic sampling system. By using a photoelectric conversion device with a meta-surface electron emitter, it isolates the detection function from the unnecessary laser beam incidence and optical components (prism, mirror, lens), achieving polarity detection with a simplified configuration that only requires the electromagnetic wave to be measured.
Solution Approach 2:
The patent replaces the mechanical/optical system (prism, mirror, lens) with an electromagnetic field-based detection mechanism. The photoelectric conversion device uses the electric field component of the electromagnetic wave directly to control electron emission from the meta-surface, eliminating the need for mechanical optical components while maintaining the ability to measure electric field strength for each polarity.
2Device complexity
If a photoelectric conversion device with a meta-surface electron emitter is used, then the configuration can be simplified, but the ability to measure electric field strength for each polarity cannot be achieved without additional complex systems
Solution Approach 1:
The patent applies dynamics by making the electron emission process controllable through the polarity of the electric field. The meta-surface electron emitter dynamically responds to the electric field polarity, allowing electrons to be emitted preferentially in one direction during the positive half-cycle and in the opposite direction during the negative half-cycle. This dynamic response enables polarity discrimination while maintaining a simple device configuration.
Solution Approach 2:
The patent changes the parameter of electron emission direction based on the electric field polarity. By controlling the emission direction (positive or negative) according to the instantaneous polarity of the electromagnetic wave, the system can distinguish and measure the electric field strength for each polarity without requiring complex additional systems, thus achieving both simplicity and measurement capability.
3Productivity
If the photoelectric conversion device detects electrons emitted from the meta-surface, then the electromagnetic wave can be detected, but the electric field strength for each polarity cannot be distinguished
Solution Approach 1:
The patent adds the dimension of spatial direction to electron emission. Instead of merely detecting the presence of electrons, the system detects the direction of electron emission (positive or negative direction) as an additional dimension of information. This directional dimension allows the system to distinguish the polarity of the electric field while maintaining efficient electromagnetic wave detection.
Solution Approach 2:
The patent uses the direction of electron emission as an intermediary to convey polarity information. The electron emission direction acts as a mediator that translates the electric field polarity into a detectable signal. By measuring which direction electrons are emitted, the system can infer the polarity of the electric field, thus achieving polarity discrimination through the electron emission process itself without requiring separate measurement systems.
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 the measurement of electric field strength for each polarity of electromagnetic waves with a simplified configuration, improving detection accuracy and reducing system complexity.
Implementation Method 1
The electron emitter includes a meta-surface emitting an electron in response to incidence of an electromagnetic wave
Implementation Method 2
The potential control unit controls electric potentials applied to the meta-surface. The plurality of patterns include an antenna portion and at least one bias portion. The potential control unit is configured to switch a first state and a second state by controlling electric potentials applied to the plurality of patterns
Data Source
AI summary
In a photoelectric conversion device, the potential control unit controls electric potentials applied to the meta-surface. The meta-surface includes a plurality of patterns which are space away from each other. The plurality of patterns include an antenna portion and at least one bias portion. The antenna portion extends in a predetermined direction and emits the electron in response to incidence of the electromagnetic wave. The potential control unit switches a first state and a second state by controlling the electric potentials applied to the plurality of patterns. In the first state, a component of an electric field from the bias portion toward the antenna portion in a predetermined direction is positive. In the second state, a component of an electric field from the bias portion toward the antenna portion in the predetermined direction is negative.