March 2007

Terahertz Technology: A Land to Be Discovered

Martin Koch

Terahertz technology holds great promise for wireless communication and imaging applications, such as security checks of people, mail or luggage, quality control of pharmaceutical or polymeric goods and clinical diagnostics.


A Twin Photon Source Based on All-Optical Fiber

The most important question in cryptography is how to ensure the security of a message between its sender and receiver. A quantum approach is desirable because detecting and duplicating a photon’s quantum state—that is, sending a message and keeping a copy— is prohibited by the laws of quantum mechanics. A new light source brings quantum cryptography closer to reality.

All-Optical Signal Processing by Fiber-Based Parametric Devices

Parametric devices based on four-wave mixing in fibers enable the amplification, frequency conversion and phase conjugation of optical signals. They can also be used to monitor, regenerate, switch and buffer signals.

Dynamic Photonic Crystals

When dynamic behaviors are introduced into photonic crystal systems, fascinating new possibilities emerge. For example, the bandwidth of a pulse can be completely compressed to zero, resulting in on-chip all-optical stopping and storage of light pulses.

 

Optics in Armenia

Photonic Crystals: What’s in a Name?

Drilling Opals to Create Optical Cavities

Did You Know?

Honorary OSA Members of the 1920s and 1930s

 

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