Terahertz Source Embedded in Two-Wire Waveguide
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Solution Overview
Problem
Efficient coupling of Terahertz (THz) pulses into two-wire waveguides is hindered by the difficulty in focusing THz radiation due to the small gap between the wires, leading to low coupling efficiency and limited applicability of existing systems.
Innovation Solution
Embedding a THz source within the two-wire waveguide and illuminating it with a pump source to generate THz signals directly inside the waveguide, enhancing coupling efficiency by over 63 times compared to passive configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a PC antenna is used to couple THz radiation into a two-wire waveguide from free space, then the system structure is simple, but the coupling efficiency is low due to the small gap between wires causing diffraction limitations
Solution Approach 1:
The patent introduces an intermediary focusing structure (lens or reflector) between the PC antenna and the two-wire waveguide. This intermediary component focuses the THz radiation onto the small gap between the wires, enabling efficient coupling while maintaining the simplicity of the overall system architecture.
2Length of stationary object
If the gap between wires is reduced to achieve tighter confinement, then the waveguide can guide over longer distances, but the diffraction limit makes focusing THz radiation increasingly difficult
Solution Approach 1:
The patent employs focusing structures that operate in different dimensional spaces to concentrate THz radiation onto the sub-wavelength gap. By using lenses or reflectors with specific geometries, the system achieves focusing in the transverse dimension while maintaining the longitudinal propagation direction, effectively overcoming the diffraction limit imposed by the small gap size.
3Ease of operation
If free space coupling is used, then the system is easier to implement, but a large fraction of THz radiation is not coupled into the waveguide
Solution Approach 1:
The patent introduces an intermediary focusing structure (lens or reflector) between the PC antenna and the two-wire waveguide. This intermediary component focuses the THz radiation onto the small gap between the wires, enabling efficient coupling while maintaining the simplicity of the overall system architecture.
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 active waveguide system significantly improves THz radiation coupling into the two-wire waveguide mode, allowing for stronger signal transmission and reduced propagation losses, making it suitable for longer distances and more flexible applications.
Implementation Method 1
a photoconductive (PC) antenna... The combined system consisting of a PC antenna interconnected with a two-wire waveguide
Data Source
AI summary
A method and a system for generating terahertz signals, the system comprising a pump source, a two-wire waveguide; and at least one terahertz source, wherein the terahertz source is embedded within the two-wire waveguide and the pump source is configured to illuminate the terahertz source, the terahertz source generating terahertz signals directly within the two-wire waveguide. A terahertz source, embedded within a two-wire waveguide, said source being configured to be illuminated within the two-wire waveguide with a pump source for generating terahertz signals directly inside the two-wire waveguide. A two-wire waveguide system is thus provided, comprising a two-wire waveguide and a terahertz source embedded between the wires of the two-wire waveguide and configured to be illuminated within the two-wire waveguide with a pump source for generating terahertz signals directly inside the two-wire waveguide.