Rare Earth Orthoferrite Tuning of Transmitted Waves as Natural Metamaterials

Abstract

Metamaterials display many electromagnetic properties, such as the manipulation of electromagnetic waves through the arrangement of small discrete structures. However, complex designs of mechanically or electrically patterned structures are required to modify these properties. We report on the use of rare earth orthoferrites to tune transmitted waves by engineering the thickness, composition, and temperature using terahertz (THz) time-domain spectroscopy. The modeling of the process of manipulating the transmitted waves helps to elucidate the manipulated amplitude, transmittance, peak height, and frequency. The effectiveness of thickness engineering in tuning the transmitted waves, which conformed to the Beer–Lambert law, was demonstrated. The transmitted waves were also strongly affected by doping. In addition, a thermal anisotropic energy manipulation approach to tuning transmitted waves was developed by lowering the temperature. Rare earth orthoferrites are a kind of effective medium in the THz range and exhibit the signature of natural metamaterials.

Methodology to Probe Disorder Contribution in Raman Linewidth via Optical Absorption Spectroscopy in Orthoferrite EuFeO3

“…The perovskite oxides possess intriguing physical properties that make them potential candidates for various technological applications. 48−54 Especially, the rare earth orthoferrite (RFeO 3 ) family of such materials has been of much interest in spintronics, 55 multiferroics, 56 magneto-optics, 57 photovoltaics 58 and even in manipulating the electromagnetic waves 59 due to its tunable electronic, optical, and magnetoelastic behavior. 60−62 Being correlated systems, these materials are also of interest for fundamental studies.…”

“…In this study, orthoferrite EuFeO 3 (hereafter, EFO) has been considered for investigating the disorder-coupling parameter via RS and OAS techniques. The perovskite oxides possess intriguing physical properties that make them potential candidates for various technological applications. − Especially, the rare earth orthoferrite (RFeO 3 ) family of such materials has been of much interest in spintronics, multiferroics, magneto-optics, photovoltaics and even in manipulating the electromagnetic waves due to its tunable electronic, optical, and magnetoelastic behavior. − Being correlated systems, these materials are also of interest for fundamental studies. − In addition, the band gap of this family lies in the visible region, which may also provoke the resonant scattering. Such processes could certainly affect the EPIs existing in the system .…”

Metamaterial approach to mitigate ground‐borne vibrations induced by moving trains

“…Metamaterials are artificially designed materials with unusual properties that originate from the rational design of their microarchitectures, which have been described in detail in the authors’ works [10–21]. In the past few years, with the emergence of metamaterials, research methods based on metamaterials have been rapidly developed in various fields, one of which is the research on mitigation measures of train‐induced ground vibrations.…”