This results in common optical limitations such as a diffraction barrier. The magnetic interaction in lens material is essentially nil. The interaction of a conventional lens, or other natural materials, with light is heavily dominated by the interaction with the electric field (one-handed). In other words, light consists of an electric field and magnetic field. This is observed, for example, with a natural glass lens, which interacts with light (the electromagnetic wave) in a way that appears to be one-handed, while light is delivered in a two-handed manner. The development of electromagnetic, artificial-lattice structured materials, termed metamaterials, has led to the realization of phenomena that cannot be obtained with natural materials. Or the response can be as a passive material. The appeal and usefulness is derived from a resonant response that can be tailored for specific applications, and can be controlled electrically or optically. In addition, the desired results are based on the resonant frequency of fabricated fundamental elements. Yet, the interaction achieved is below the dimensions of the terahertz radiation wave. However, the lattice structure of this new material consists of rudimentary elements much larger than atoms or single molecules, but is an artificial, rather than a naturally occurring structure. The metamaterials are based on a lattice structure which mimics crystal structures. About metamaterials Terahertz waves lie at the far end of the infrared band, just before the start of the microwave band.Ĭurrently, a fundamental lack in naturally occurring materials that allow for the desired electromagnetic response has led to constructing new artificial composite materials, termed metamaterials. Finally, as a non-ionizing radiation it does not have the risks inherent in X-ray screening. However, the terahertz wavelength, or frequency range, appears to be useful for security screening, medical imaging, wireless communications systems, non-destructive evaluation, and chemical identification, as well as submillimeter astronomy. Likewise, the terahertz gap also borders optical or photonic wavelengths the infrared, visible, and ultraviolet ranges (or spectrums), where well developed lens technologies also exist. Electronics technology controls the flow of electrons, and is well developed for microwaves and radio frequencies. These characteristics mean that it is difficult to influence terahertz radiation with conventional electronic components and devices. This is because terahertz waves are electromagnetic waves with frequencies higher than microwaves but lower than infrared radiation and visible light. This bandwidth is also known as the terahertz gap because it is noticeably underutilized. The terahertz frequency range used in materials research is usually defined as 0.1 to 10 THz. A terahertz metamaterial is a class of composite metamaterials designed to interact at terahertz (THz) frequencies.
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