Abstract
Tetrahedrons are basic building blocks in natural and artificial materials, while the terahertz response of micro tetrahedrons has been little explored. Here we fabricate subwavelength ceramic tetrahedrons for use in the terahertz frequency range, and find that the three-dimensional geometry significantly affects their terahertz properties. The transmission spectra are independent of the orientation of the tetrahedrons, while the first magnetic resonance disappears in the reflection spectra when an upright tetrahedron is flipped upside down on the metallic substrate, which changes it from a perfect absorber to a perfect reflector. This is attributed to the destructive interference between two magnetic dipoles induced respectively by the incident and the reflected wave. The study brings new insights in the materials design with 3D building blocks to realize more interesting and exotic terahertz properties.
Highlights
Tetrahedrons are basic building blocks in natural and artificial materials, while the terahertz response of micro tetrahedrons has been little explored
A special feature is found in the reflection spectra that a simple upside-down flip switches the tetrahedron from a perfect absorber to a perfect reflector at the first magnetic resonant frequency, which is attributed to the destructive interference effect caused by the orientation change of the asymmetric geometry
We fabricate micro ZrO2 ceramic tetrahedrons and use them to investigate the role of the asymmetric geometry of micro dielectric particles in response to the terahertz EM waves
Summary
Tetrahedrons are basic building blocks in natural and artificial materials, while the terahertz response of micro tetrahedrons has been little explored. Such properties can be engineered by tailoring materials, shapes and sizes of building blocks[11,12] Both metallic and dielectric building blocks with different s hapes[1,2,3], such as cubes, disks and planar patterns from lithography, have been studied from microwave to visible wavelengths, while asymmetric three-dimensional (3D) geometries have shown different features in terahertz applications[13,14]. A special feature is found in the reflection spectra that a simple upside-down flip switches the tetrahedron from a perfect absorber to a perfect reflector at the first magnetic resonant frequency, which is attributed to the destructive interference effect caused by the orientation change of the asymmetric geometry
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