Featured
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Nonlinear helical dichroism in chiral and achiral molecules
Nonlinear absorption of helical light beams offers a new chiroptical detection scheme for both chiral and achiral molecules in liquid phase.
- Jean-Luc Bégin
- , Ashish Jain
- & Ravi Bhardwaj
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News & Views |
Spectroscopy finds chiral phonons
The chiral nature of phonons in crystals of biomolecules is identified by terahertz spectroscopy, paving the way to a better understanding of biochemical processes.
- Minkyu Kim
- & Vladimir V. Tsukruk
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Article |
Chiral phonons in microcrystals and nanofibrils of biomolecules
Chiral phonons—long-range lattice vibrations with rotational motion of atoms—are observed by terahertz chiroptical spectroscopy in biocrystals. Terahertz circular dichroism peaks between 0.2 and 2.0 THz clearly identify the chirality of these phonons in various microcrystalline and nanofibrils of biomolecules.
- Won Jin Choi
- , Keiichi Yano
- & Nicholas A. Kotov
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Interferometric attosecond lock-in measurement of extreme-ultraviolet circular dichroism
A time-domain approach that can continuously tune the polarization state of extreme-ultraviolet attosecond pulses allows the isolation and amplification of extremely weak chiral signals, extending vectorial measurements to the attosecond and nanometre scales.
- Doron Azoury
- , Omer Kneller
- & Nirit Dudovich
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Letter |
Optical determination of the Néel vector in a CuMnAs thin-film antiferromagnet
Due to their nature antiferromagnets are difficult to probe with conventional magnetometers. The Néel vector of a practically important antiferromagnet, CuMnAs, has now been determined by a femtosecond pump–probe magneto-optical experiment.
- V. Saidl
- , P. Němec
- & T. Jungwirth
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Article |
Polarization control in an X-ray free-electron laser
Tunable polarization control and a two-colour X-ray pump–X-ray probe operating mode are demonstrated at the Linac Coherent Light Source (LCLS).
- Alberto A. Lutman
- , James P. MacArthur
- & Heinz-Dieter Nuhn
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News & Views |
Twisted high-harmonic generation
Crossing two focused laser beams with opposite circular polarization makes the production and application of circularly polarized light in the extreme ultraviolet and soft X-ray spectral regions considerably easier and more efficient.
- Kjeld S. E. Eikema
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Article |
Non-collinear generation of angularly isolated circularly polarized high harmonics
Scientists have demonstrated non-collinear circularly polarized high-harmonic generation and showed that this method generates bright circularly polarized extreme-ultraviolet beams with both left and right helicity simultaneously.
- Daniel D. Hickstein
- , Franklin J. Dollar
- & Charles G. Durfee
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Letter |
A table-top ultrashort light source in the extreme ultraviolet for circular dichroism experiments
A table-top source based on high-harmonic generation produces bright, coherent, quasi-circular pulses of extreme ultraviolet light for probing chiral molecules.
- A. Ferré
- , C. Handschin
- & Y. Mairesse
Sensitive near-infrared circularly polarized light detection via non-fullerene acceptor blends