Terahertz Device Refractive Index Gradient for Gain
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for a solution to enhance gain in terahertz devices operating in the 0.1 THz to 10 THz frequency range, which face challenges in efficiently generating and receiving electromagnetic waves due to excessive reflection and multiple resonant modes at the boundaries within the device.
Innovation Solution
A terahertz device configuration that includes a terahertz element surrounded by a dielectric material with a refractive index lower than the element's refractive index but higher than the gas refractive index, along with a gas space and a reflecting portion, which reduces the refractive index change at boundaries and suppresses excessive reflection, allowing for improved electromagnetic wave transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a terahertz element is used to generate or receive electromagnetic waves in the terahertz waveband, then the device can achieve large-capacity communication or information processing, imaging or measurement capabilities, but excessive reflection and multiple resonant modes occur at the boundaries, reducing gain
Solution Approach 1:
The patent applies parameter changes by carefully selecting and controlling the refractive indices of different materials in the device structure. Specifically, the dielectric layer is chosen to have a refractive index between that of the terahertz element and the gas space, creating a gradual refractive index transition that reduces reflection at boundaries and suppresses multiple resonant modes, thereby improving gain.
2Device complexity
If the terahertz element is directly exposed to gas space, then the structure is simple, but the refractive index change at the boundary causes excessive reflection and multiple resonant modes
Solution Approach 1:
The patent introduces a dielectric layer as an intermediary between the terahertz element and the gas space. This intermediate layer has a refractive index that is higher than the gas space but lower than the terahertz element, serving as a transition medium that reduces the abrupt refractive index change at the boundary, thereby suppressing excessive reflection and multiple resonant modes while maintaining relatively simple device structure.
3Productivity
If a dielectric with high refractive index is used to surround the terahertz element, then the electromagnetic wave transmission is improved, but the refractive index difference at the boundary increases causing excessive reflection
Solution Approach 1:
The patent optimizes the refractive index parameter of the dielectric layer to achieve a balance between electromagnetic wave transmission and reflection control. The dielectric refractive index is specifically selected to be between the terahertz element refractive index and the gas refractive index, creating a gradual transition that improves transmission while minimizing reflection loss.
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 configuration enhances the gain of the terahertz device by reducing excessive reflection and multiple resonant modes, leading to improved output and frequency characteristics, thereby broadening the frequency band with stable high gain.
Implementation Method 1
a dielectric, including a dielectric material and surrounding the terahertz element; a gas space, including a gas; and a reflecting portion, including a portion opposing the terahertz element through the dielectric and the gas space and reflecting the electromagnetic wave toward a direction, wherein the electromagnetic wave is generated from the terahertz element and transmitted through the dielectric and the gas space. An element refractive index, which is the refractive index of the terahertz element, is higher than a gas refractive index, which is a refractive index of the gas, and a dielectric refractive index, which is the refractive index of the dielectric, is lower than the element refractive index and higher than the gas refractive index.
Implementation Method 2
a reflecting portion, including a portion opposing the terahertz element through the dielectric and the gas space and reflecting the electromagnetic wave toward a direction
Data Source
AI summary
A terahertz device of the present invention includes a terahertz element generating an electromagnetic wave, a dielectric including a dielectric material and surrounding the terahertz element, a gas space including a gas, and a reflecting film serving as a reflecting portion. The reflecting film includes a portion opposing the terahertz element through the dielectric and the gas space and reflecting the electromagnetic wave toward a direction, wherein the electromagnetic wave is generated from the terahertz element and transmitted through the dielectric and the gas space. In addition, the refractive index of the dielectric is lower than the refractive index of the terahertz element and is higher than the refractive index of the gas in the gas space.