Terahertz Oscillator Amorphous Layer Harmonic Suppression

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Solution Overview

Problem

Existing terahertz wave oscillators using negative resistive elements suffer from parasitic oscillations and unwanted harmonics at frequencies higher than the desired oscillation frequency, which reduce the output at the desired frequency and are not effectively suppressed by existing configurations.

Innovation Solution

The oscillator incorporates a negative resistive element with semiconductor layers and an amorphous layer with higher resistivity than the semiconductor layers, strategically positioned between the conductors and dielectric, to increase effective resistance and losses for unwanted harmonics, thereby suppressing parasitic oscillations and harmonics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If a negative resistive element is used to generate terahertz waves, then oscillation output is achieved, but parasitic oscillations and harmonics at unwanted frequencies are generated

Engineering Contradiction:

Improveoscillation outputVSAvoidparasitic oscillations and harmonics

Core Design Contradiction:

PowerVSObject-generated harmful factors

Solution Approach 1:

The invention converts the harmful parasitic oscillations and harmonics into beneficial effects by strategically placing resistive elements at specific positions within the resonator. These resistive elements, positioned at locations with high electric field intensity for unwanted frequencies, increase losses for parasitic oscillations and harmonics while maintaining low loss for the desired fundamental frequency, thus converting what would be harmful frequency components into a mechanism for suppressing unwanted oscillations

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The invention applies different resistance values at different locations within the resonator structure. By placing resistive elements with specific resistance values at positions corresponding to high electric field intensity for unwanted frequencies (such as harmonics and parasitic oscillations), the structure creates localized quality variations that selectively increase losses for unwanted frequencies while preserving the fundamental oscillation mode

Inventive Principle:

Principle #3Local quality

2Device complexity

If existing suppression configurations are added to reduce parasitic oscillations, then device complexity increases, but suppression effectiveness for harmonics higher than desired frequency is insufficient

Engineering Contradiction:

Improvesuppression configurationVSAvoidsuppression effectiveness

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The invention merges the suppression function directly into the resonator structure by integrating resistive elements as part of the resonator's internal configuration rather than adding separate external suppression circuits. This integration allows the resonator to simultaneously generate the fundamental frequency and suppress harmonics and parasitic oscillations through its inherent structure, eliminating the need for additional complex suppression components

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The resistive elements act as intermediaries that selectively interact with different frequency components within the resonator. By positioning these resistive elements at specific locations where electric field intensity varies across different frequencies, they mediate between the fundamental oscillation mode and unwanted harmonic modes, increasing losses for harmonics while maintaining low loss for the desired frequency

Inventive Principle:

Principle #24Intermediary (Mediator)

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 effectively suppresses oscillations at unwanted frequencies, ensuring stable operation at the desired terahertz frequency by increasing losses for second and third harmonics, thereby enhancing the oscillation output at the desired frequency.

Implementation Method 1

a layer with a higher resistivity than the first semiconductor layer or the second semiconductor layer is disposed between the negative resistive element and the dielectric

Methodology Applied

Scientific EffectElectrical Resistance: Electrical Resistance

Implementation Method 2

increasing losses for second and third harmonics, thereby suppressing parasitic oscillations and harmonics

Methodology Applied

Scientific EffectHarmonic Suppression: Damping

Implementation Method 3

a negative resistive element including a first semiconductor layer, a second semiconductor layer, and an active layer disposed between the first semiconductor layer and the second semiconductor layer

Methodology Applied

Scientific EffectNegative Resistance:

Implementation Method 4

a resonator including a first conductor, a second conductor, and a dielectric disposed between the first conductor and the second conductor

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS11496095B2Oscillator

Publication Date: 2022.11.08 CANON KK

AI summary

An oscillator oscillating a tera hertz wave includes a negative resistive element including a first semiconductor layer, a second semiconductor layer, and an active layer disposed between the first semiconductor layer and the second semiconductor layer, with a first conductor, a second conductor, and a dielectric disposed between the first conductor and the second conductor constitutes a resonator, wherein the negative resistive element is disposed between the first conductor and the second conductor, and a layer with a higher resistivity than the first semiconductor layer or the second semiconductor layer, or an amorphous layer is disposed between the negative resistive element and the dielectric.