Terahertz Wave Generation with Orbital Angular Momentum
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Solution Overview
Problem
Current methods for loading angular momentum onto terahertz wave beams are inefficient due to high light intensity consumption, which limits their application in channel multiplexing and requires both time modulation signals and a spiral phase wave-front, making them unsuitable for the terahertz frequency band.
Innovation Solution
A generation device comprising a first and second laser, an orbital angular momentum generator, a beam combiner, and a terahertz radiation transmitter, where the first laser beam passes through the generator to acquire orbital angular momentum, combined with the second laser beam, and processed to produce terahertz waves with orbital angular momentum, utilizing a simple beam path design to minimize power consumption and maximize efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spiral phase plates or forked diffraction gratings are used to load angular momentum onto terahertz wave beams, then orbital angular momentum can be achieved, but light intensity is greatly consumed
Solution Approach 1:
The patent introduces an orbital angular momentum generator as an intermediary device that converts linearly polarized terahertz waves into circularly polarized waves with orbital angular momentum. This mediator approach avoids the high energy loss associated with direct use of spiral phase plates or forked diffraction gratings, thereby resolving the contradiction between achieving angular momentum and minimizing light intensity consumption.
2Reliability
If traditional methods are used for loading angular momentum in terahertz frequency band, then orbital angular momentum can be loaded, but the limited link budget becomes even shrinking
Solution Approach 1:
The orbital angular momentum generator serves as an efficient intermediary that preserves link budget by converting polarization states without the significant energy losses incurred by traditional spiral phase plates or diffraction gratings in the terahertz frequency band.
3Adaptability or versatility
If beams are modulated with time modulation signals and spiral phase wave-front simultaneously, then angular momentum channel multiplex applications can be enabled, but the requirements become difficult to meet in terahertz frequency band
Solution Approach 1:
The orbital angular momentum generator simplifies the modulation process by directly converting linearly polarized waves into circularly polarized waves with orbital angular momentum, making it easier to implement channel multiplex applications in the terahertz frequency band without requiring complex simultaneous modulation of time signals and spiral phase wave-fronts.
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 solution enables the generation of terahertz waves with orbital angular momentum that are low in consumption and high in efficiency, effectively addressing the limitations of existing methods by maintaining spiral phase and angular momentum information throughout the process.
Implementation Method 1
the first laser beam passes through the orbital angular momentum generator to generate the first laser beam with the orbital angular momentum
Implementation Method 2
the terahertz radiation transmitter performs frequency difference processing on the first laser beam with the orbital angular momentum and the second laser beam, and then terahertz waves with the orbital angular momentum are obtained
Implementation Method 3
the first laser beam with the orbital angular momentum and the second laser beam are combined to form a combined beam
Data Source
AI summary
The present invention relates to a generation device and a generation method of terahertz waves with orbital angular momentum. The generation device comprises a first laser and a second laser; the first laser radiates a first laser beam; the second laser radiates a second laser beam; and the frequency difference between the first laser beam and the second laser beam is within a terahertz wave band. The generation device further comprises an orbital angular momentum generator, a beam combiner and a terahertz radiation generator; the first laser beam passes through the orbital angular momentum generator to generate the first laser beam with the orbital angular momentum; after the first laser beam with the orbital angular momentum and a second laser beam are combined to form a combined beam, the combined beam reaches a terahertz radiation transmitter; the terahertz radiation transmitter performs frequency mixing and filtering processing on the first laser beam A with the orbital angular momentum and the second laser beam B to generate terahertz waves with the orbital angular momentum. Through a simple beam path design, terahertz wave beams with orbital angular momentum, which are low in consumption and high in efficiency, can be obtained.