Terahertz Metalens With Peripheral Attenuation for Better Focusing
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Solution Overview
Problem
Metalenses for terahertz waves have lower light concentration efficiency compared to lenses for visible light, primarily due to circumferential incidence of light affecting the light concentration efficiency.
Innovation Solution
A metalens design with a first region for diffracting and concentrating terahertz waves and a second region surrounding it with lower transmittance than the first region, effectively attenuating or blocking terahertz waves circumferentially incident from the periphery to enhance light concentration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a metalens is designed with a flat plate shape to concentrate and collimate terahertz waves, then the device achieves a thin profile suitable for 6G communication systems, but the light concentration efficiency is lower compared to traditional lenses for visible light
Solution Approach 1:
The metalens is divided into two distinct regions: a first region with microstructures for diffracting and concentrating terahertz waves, and a second surrounding region with different transmittance characteristics. This segmentation allows each region to perform its specific function optimally, improving overall light concentration efficiency while maintaining the thin flat-plate structure
Solution Approach 2:
Different regions of the metalens are assigned different transmittance properties: the first region has higher transmittance for the target wavelength to enable effective wave concentration, while the second region has lower transmittance to suppress circumferential incidence. This local differentiation of optical properties resolves the efficiency problem without compromising the thin overall design
2Loss of energy
If the transmittance of the second region is reduced to suppress circumferential incidence of terahertz waves, then the light concentration efficiency is improved, but the transmittance of the first region must be maintained at a higher level to allow effective wave concentration
Solution Approach 1:
The invention controls the transmittance parameter of the second region relative to the first region, specifying that the transmittance ratio T2/T1 should be less than 0.5. This parameter control approach simplifies the design process by providing a clear quantitative guideline for achieving improved light concentration efficiency without excessive complexity
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 design achieves high light concentration efficiency for terahertz waves by reducing the adverse effects of circumferential incidence, resulting in improved focusing capabilities.
Implementation Method 1
a first region that has a plurality of microstructures disposed therein to diffract and concentrate terahertz waves
Implementation Method 2
a second region that surrounds the first region and that is a region different from the first region... the transmittance T2 is lower than the transmittance T1
Data Source
AI summary
A metalens capable of concentrating terahertz waves having a high light concentration efficiency. The metalens includes a first region that has a plurality of microstructures disposed therein to concentrate terahertz waves; and a second region that is a region that surrounds the first region and that is a region different from the first region, in which in a case where terahertz waves having a wavelength of 0.3 mm, a wavelength of 1 mm, and a wavelength of 3 mm are incident, assuming that a wavelength having a highest light concentration efficiency is a wavelength X, a transmittance of the terahertz waves having the wavelength X in the first region is a transmittance T1, and a transmittance of the terahertz waves having the wavelength X in the second region is a transmittance T2, the transmittance T2 is lower than the transmittance T1.