Spatiotemporal Permittivity Modulation for Optical Frequency Conversion
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Solution Overview
Problem
Existing optical devices struggle to achieve frequency conversion and oscillation in bands where conventional optical properties are insufficient, limiting the range of frequency conversion and oscillation efficiency.
Innovation Solution
A parametric device with slabs of optical material whose permittivity is spatiotemporally modulated, allowing for control over conversion frequency and amplification efficiency, and capable of operating as a frequency converter, oscillator, or amplifier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional optical properties are used for frequency conversion, then the device structure is simple, but the frequency conversion efficiency is limited and cannot achieve conversion in challenging bands
Solution Approach 1:
The patent applies dynamics by making the permittivity of optical materials time-varying through periodic modulation. This dynamic parameter change enables the system to achieve frequency conversion in challenging bands where conventional static materials fail, directly improving frequency conversion efficiency while managing device complexity through controlled temporal variation
Solution Approach 2:
The patent changes the fundamental parameter of permittivity from static to time-varying through periodic modulation. This parameter change transforms the optical material's response characteristics, enabling efficient frequency conversion in bands that were previously difficult to achieve, thereby resolving the contradiction between conversion efficiency and device complexity
2Adaptability or versatility
If inherent nonlinearity of materials is used for frequency conversion, then the device is simple to implement, but the conversion frequency and efficiency are limited by material properties
Solution Approach 1:
The patent changes the permittivity parameter of optical materials through periodic modulation, enabling frequency conversion beyond the limits of inherent material nonlinearity. This approach expands the adaptable frequency conversion range without being constrained by fixed material properties, while maintaining relatively simple device implementation
Solution Approach 2:
By introducing time-varying permittivity through periodic modulation, the system gains dynamic control over frequency conversion characteristics. This dynamic approach allows versatile frequency conversion across different bands without requiring multiple specialized materials, thereby improving adaptability while managing material requirements
3Productivity
If gain characteristics of materials are used for oscillation, then the device structure is simple, but the amplification efficiency and frequency control are limited
Solution Approach 1:
The patent applies periodic modulation to change the permittivity parameter of optical materials, enabling controlled oscillation with improved amplification efficiency. This parameter modulation provides frequency control capability that was limited in conventional gain-based oscillators, while maintaining relatively simple device structure
Solution Approach 2:
By introducing time-varying permittivity through periodic modulation, the system achieves dynamic control over oscillation frequency and amplification efficiency. This dynamic approach improves productivity by enabling efficient oscillation in challenging bands while managing control mechanism complexity through unified modulation control
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 efficient frequency conversion and oscillation in challenging bands, allowing for arbitrary designation of electromagnetic wave propagation directions and control over frequency and amplification rates.
Implementation Method 1
a plurality of slabs of which permittivity is periodically changed over time
Implementation Method 2
frequency conversion and oscillation characteristics of electromagnetic waves is to utilize optical properties of a material
Data Source
AI summary
A multifunctional parametric device using an optical material in which permittivity is spatiotemporally modulated according to the present invention may be used as a frequency converter and oscillator according to a design characteristic. Since a converted and oscillated frequency is determined according to a modulation frequency of a thin slab of which permittivity is spatiotemporally modulated, a user is capable of actively determining a frequency modulation and oscillation characteristic using the parametric device.