Terahertz Waves And Applications

Imaging technology has a rich history that began thousands of years ago. The reflection from a pool of still water or a shiny metal surface was arguably the first imaging method routinely used by mankind. With the advent of lenses, many other novel forms of optical imaging emerged, including telescopes and microscopes.

Using a lens, a pinhole camera, and a sensitized pewter plate, Ni?pce was the first person to permanently record an image. Optical photography and other forms of optical imaging have since become commonplace.

Of course, imaging has not been constrained to optical frequencies. In 1895 Roentgen discovered X-rays. As with X-rays, whenever a portion of the electromagnetic (EM) spectrum became practically usable, it wasn?t long before it was adapted to an imaging configuration.

Therefore, it is not surprising that many types of imaging systems exist today and utilize the radio, microwave, infrared (IR), visible, ultraviolet, X-ray, and gamma ray portions of the EM spectrum.

Pressure waves have also been adapted to imaging and are manifest in the various forms of ultrasonic and sonographic imaging systems.

Terahertz (THz) radiation (0.1 THz to 10 THz, 1 THz = 1012 Hz) lies between the infrared (night vision cameras) and microwave (operating range of mobile phones) region of the electromagnetic spectrum.

What makes these waves so fascinating to scientists is their ability to penetrate materials that are usually opaque to both visible and infrared radiation. For example, terahertz waves can pass through fog, fabrics, plastic, wood, ceramics and even a few centimeters of brick - although a metal object or a thin layer of water can block them.

The way in which terahertz waves interact with living matter has potential for highlighting the early signs of tooth decay and skin or breast cancer, or understanding cell dynamics.
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Terahertz Technology

Presented By:
Peter H. Siegel

Terahertz technology applications, sensors, and sources are briefly reviewed. Emphasis is placed on the less familiar components, instruments, or subsystems. Science drivers, some historic background, and future trends are also discussed


THESE DAYS, it is not possible to do justice to an entire field or give sufficient credit to all its deserving technical innovators in one short paper, even in a relatively narrow area of development like terahertz technology. If this were the case, we would not have such a plethora of journals to submit to ,nor conferences to attend. One thing is certain, the IEEE Microwave Theory and Techniques Society (IEEE MTT-S), through its journals and sponsored conferences, has played a major role in defining, distributing informationon , and advancing the field of terahertz technology since the societyâ„¢s inception a half-century ago. During the course of this paper, we look back to the infancy of modern terahertz technology, beginning where Wiltse so ably left off in 1984 , pass through early childhood, and end up at adolescence. The field is perched on adulthood and perhaps, in another quarter-century, a more complete history can be written, hopefully by someone reading this paper today.

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Seminar Report of Terahertz waves and applications

What are Terahertz waves?
Terahertz (THz) waves refer to waves that are in the frequency range that is situated between the infrared and microwave region of the electromagnetic spectrum .
Frequency range- 100Ghz to 10THz
Wave length-1mm to 100 micro meter
Referred to as submillimeter radiation, terahertz waves,terahertz light, T-rays, T-light, T-lux and THz.
Travel in line of sight.
It is non-ionizing 
penetrate a wide variety of non-conducting materials
can penetrate materials that are usually opaque to both visible and infrared radiation.
Terahertz radiation is emitted as part of the black body radiation from anything with temperatures greater than about 10 kelvin. While this thermal emission is very weak.
The only viable sources of terahertz radiation were :-
The gyrotron
the backward wave oscillator ("BWO"),
the far infrared laser ("FIR laser"),
1. Imaging:-
(A)How imaging done?
Disadvantages :-
unzip double-stranded DNA.
creating bubbles in the double strand that could significantly interfere with processes such as gene expression and DNA replication.
suffer from attenuation caused by rain and resonant absorption in oxygen and water molecules, so they are unsuitable for long-range radio communications
Tera hertz waves are more advantageous than other electromagnetic waves.
Due to its non ionizing property it will be used widely in medical imaging.
Terahertz imaging are now in demand for quality control & security purpose.

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