Terahertz

WHAT IS TERAHERTZ RADIATION

A narrow band located between infrared and microwave with the frequency in the range of 10¹² hertz and this is called “Terahertz Radiations (T-rays)

WHY IT IS IMPORTANT

According to its useful properties (listed below) that can be applied to the application, for example, healthcare, security or imaging applications. - lower photon energy than x-rays – due to the higher wavelength, hence the energy is lower. Therefore, the possibility of the ionization is low meaning that the T-rays (Terahertz rays) is safe for users and operators, - extreme water absorption – the terahertz frequency cannot pass through any kind of water molecule including the vapor meaning that T-rays will be blocked from the vapor in the air. So the wave can propagate only in the meter range distance, - longer wavelength than visible and IR – meaning that the T-rays will have less affected by Mie Scattering, so the wave can penetrate through almost drying dielectric materials.

HOW DO I KNOW MORE ABOUT IT?

These are the lists of books and suggested research that would be suitable to one who want to start understand the metamaterials more

• i. Withayachumnankul, W. and D. J. I. P. J. Abbott (2009). “Metamaterials in the terahertz regime.” 1(2): 99-118.
• ii. Tao, H., et al. (2008). “A metamaterial absorber for the terahertz regime: design, fabrication and characterization.” Opt Express 16(10): 7181-7188.
• iii. Hecht, E. (2017). Optics, Addison-Wesley.
• iv. Wenshan Cai, Vladimir Shalaev, Optical Metamaterials: Fundamentals and Applications.

However, the metamaterials also can be studied by using COMSOL multi-physics.

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