How do photoconductive antennas work?

How do photoconductive antennas work?

A photoconductive antenna (PCA) is used as fast electrical switch. The antenna gap is conducting only during its illumination by an optical pulse. The time shift between THz and optical pulse is changed stepwise with a time increment Δt.

How do I create a THz signal?

The most common way to generate terahertz radiation is to use photoconductive antenna [25-26], as shown in the Fig- ure 7. Coplanar two electrodes are evaporated on one side of semiconductor materials (such as GaAs), and two elec- trodes are connected to DC bias voltage.

How do you measure THz?

Using this detection method, the THz electric field is sensed by measuring the change of the birefringence properties of the crystal, caused by the field itself. These changes can be measured by analyzing the polarization properties of an optical probe beam going through the crystal.

What is THz antenna?

The terahertz (THz) antennas, which have features of small size, wide frequency bandwidth and high data rate, are important devices for transmitting and receiving THz electromagnetic waves in the emerging THz systems.

How is terahertz radiation detected?

Primary semiconductor devices for detection of THz radiation are the photon extrinsic photoconductors and thermal detectors.

How is terahertz radiation produced?

When light strikes the surface, electrons are excited to higher energy levels and can move around the surface, where they are accelerated by the large electric field. These electrons will radiate away their extra energy at the surface, creating terahertz radiation.

What is sub THz?

About Sub-THz : The frequency spectrum ranges between 90 GHz and 300 GHz is referred as sub-THz spectrum. The sub-THz spectrum enables very high data rate (~1 Tbps) wireless communication system. It offers higher bandwidth which is several tens of GHz.