Terahertz optics taking off - p666 - 669

doi:10.1038/nphoton.2013.239

Advances in terahertz sources and measurement techniques are opening up new opportunities for fundamental material research in the terahertz region.

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Frontiers in terahertz sources and plasmonics - p666 - 669

doi:10.1038/nphoton.2013.235

The development of innovative tools and techniques is vital for improving research capabilities and opening up new research directions in the terahertz regime. Terahertz sources and plasmonics are just two examples of current exciting advances.

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Resonant and nonresonant control over matter and light by intense terahertz transients - pp680 - 690

Tobias Kampfrath, Koichiro Tanaka & Keith A. Nelson

doi:10.1038/nphoton.2013.184

This article provides an overview and illustrative examples of how the electric and magnetic fields of intense terahertz transients can be used to resonantly, and even nonresonantly, control matter and light. It discusses the fundamental interaction mechanisms of intense terahertz radiation with matter.

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Wave engineering with THz quantum cascade lasers - pp691 - 701

Carlo Sirtori, Stefano Barbieri & Raffaele Colombelli

doi:10.1038/nphoton.2013.208

This article reviews state-of-the-art engineering of the spectral and spatial emission properties of terahertz quantum cascade lasers by focusing on three key factors: photonic structures for extracting and confining light in a cavity, an upconversion technique based on nonlinear intracavity mixing and a frequency stabilisation technique based on femtosecond-laser combs.

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Superconducting emitters of THz radiation - pp702 - 710

Ulrich Welp, Kazuo Kadowaki & Reinhold Kleiner

doi:10.1038/nphoton.2013.216

Recent progress on terahertz-emission devices based on the high-temperature superconductor Bi₂Sr₂CaCu₂O_8+δ is reviewed. The emission mechanism is explained as a result of collective resonant modes in a stack of intrinsic Josephson junctions. Remarkable features of the linewidth, tunability, the optimum bias condition and the thermal influence are discussed.

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