Piezoelectric Mechanical Frequency Combs With Low-Power Parametric Pumping

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Solution Overview

Problem

Existing micromechanical frequency combs require complex electrostatic coupling and high input power, limiting their practical applications in precision sensing and frequency synthesizers.

Innovation Solution

A piezoelectric multimode mechanical resonator system utilizing non-degenerate parametric pumping with a single frequency electrical input generates phononic frequency combs, achieving tunable frequency combs with low input power and eliminating the need for electronic amplifiers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If electrostatic coupling of multiple resonators is used to generate micromechanical frequency combs, then frequency comb generation is achieved, but device complexity and input power requirements increase

Engineering Contradiction:

Improvefrequency comb precisionVSAvoidresonator coupling complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges multiple resonator functions into a single piezoelectric resonator structure. The device combines multiple resonance modes (fundamental and overtone modes) within one resonator that is excited by a single electrical input, eliminating the need for complex electrostatic coupling between multiple separate resonators. This integration maintains frequency comb generation capability while reducing device complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The single piezoelectric resonator is designed to perform multiple functions simultaneously: it generates multiple resonance modes, couples them through piezoelectric interaction, and produces the frequency comb spectrum all within one device structure. This multi-functionality replaces what previously required multiple specialized components working together.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If electrostatic coupling methods are used for frequency comb generation, then frequency combs are produced, but input power requirements become excessively high

Engineering Contradiction:

Improvefrequency comb precisionVSAvoidinput power consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent changes the excitation parameter from high-power electrostatic coupling to low-power piezoelectric excitation. By using a single electrical input frequency that couples to multiple mechanical resonance modes through piezoelectric effects, the system achieves frequency comb generation with significantly reduced input power requirements compared to traditional electrostatic methods.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If multiple resonators are coupled electrostatically, then frequency combs can be generated, but environmental drift and noise increase

Engineering Contradiction:

Improvefrequency comb precisionVSAvoidenvironmental stability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

By merging multiple resonance modes into a single physically integrated piezoelectric resonator, the system ensures that all modes experience identical environmental conditions. This common-mode rejection of environmental disturbances reduces drift and noise, improving reliability while maintaining frequency comb precision.

Inventive Principle:

Principle #5Merging (Combining)

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

The system provides high-precision sensing and frequency synthesis with reduced noise and environmental drift, offering a compact, efficient, and phase-coherent solution for frequency comb generation.

Implementation Method 1

The mechanical resonator comprises a piezoelectric structure having two resonance modes within a single acoustic cavity of the mechanical resonator, coupled by thin film stress

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

a value of the single input frequency equals a sum of the resonance frequencies of the two resonance modes of the mechanical resonator which is referred as non-degenerate parametric pumping

Methodology Applied

Scientific EffectParametric pumping:

Implementation Method 3

The mechanical resonator is configured to produce at least one phononic frequency comb in response to a motion of the mechanical resonator caused by the electrical signal

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS12498616B2Piezoelectric resonant-based mechanical frequency combs

Publication Date: 2025.12.16 GEORGIA TECH RES CORP

AI summary

The present disclosure describes systems and methods for novel phononic frequency combs and related sensing techniques realized by a piezoelectric multimode or single-mode mechanical resonator based on parametric pumping. In one embodiment, a method comprises driving a piezoelectric mechanical resonator with an electrical AC signal, wherein the electrical AC signal causes motion of the piezoelectric mechanical resonator; and producing at least one phononic frequency comb in response to the motion of the piezoelectric mechanical resonator.