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The authors report by homogeneously integrating a ring quantum cascade laser with a passive waveguide geometry, it is possible to reach a stable and tunable quantum walk comb state while improving the light outcoupling by 2 orders of magnitude.

The authors demonstrate a cutting-edge THz signal processing on-chip active wavelength division multiplexer (WDM) system operating at THz frequencies.

Low threshold lasing is widely required, especially for portable systems. Here the authors design a circular subwavelength metallic aperture in a QCL to shape its phase front and control diffraction losses, which in turn allows a lower threshold dissipation power, enabling the fabrication of shorter cavities.

A polariton is a hybrid excitation resulting from strong light–matter coupling. The magneto-transport measurements have now revealed the crucial role played by its electronic component.

The authors report a semiconductor injection laser with a continuous wave emission spanning more than one octave, from 1.64 THz to 3.35 THz, with optical powers in the milliwatt range and more than 80 modes above threshold.

Synthetic dimensions allow photons and gauge fields to interact in photonic emulators. Now a study with fast-gain lasers shows that gain-driven coherence enables robust light flow in frequency space, establishing it as a viable platform for lattice emulation.

Near-transform-limited 630 fs pulses with 4.5 W of peak power are generated by compensating the dispersion of a quantum cascade laser emitting around 8 μm. Their temporal nature is assessed by a new method called asynchronous upconversion sampling.

By combining an asymmetric immersion lens setup and a complementary resonating metasurface, the authors are able to resolve the far-field transmission of an ultrastrongly coupled, highly subwavelength split-ring single resonator at millimeter wavelengths.

A ring-cavity quantum cascade laser is demonstrated to generate soliton microcombs in the mid-infrared regime.

Extreme electromagnetic field confinement in polaritonic systems is demonstrated. The tight fields can excite magnetoplasmons and result in nonlocal phenomena.

The combined technique of dual-comb multi-heterodyne detection and Fourier-transform analysis allows simultaneous acquisition and monitoring of the phase pattern of a generic frequency comb demonstrating the high degree of coherence of the emission of two quantum cascade laser frequency combs.

Montserrat Garcia-Closas and colleagues report a meta-analysis of three genome-wide association studies for estrogen receptor (ER)-negative breast cancer, including 4,193 ER-negative breast cancer cases and 35,194 controls, with replication using the iCOGS custom genotyping array in 40 studies, including 6,514 cases and 41,455 controls. They identify four loci associated with ER-negative but not ER-positive breast cancer.

Quantum-well photodetectors fabricated from photonic metamaterials show enhanced room-temperature sensitivity to long-wavelength infrared radiation and produce gigahertz-frequency heterodyne signals when pumped with quantum cascade lasers.

Fast and high-resolution Fourier transform spectrometers are indispensable for cutting-edge infrared spectroscopy. In this study, the authors employed a newly-designed fast-rotating retroreflective, broadband delay line demonstrating fast dual-comb spectroscopy with a single mid-infrared optical comb from a quantum cascade laser emitting at 8 micrometers.

We present a high-performance integrated platform for broadband active and passive coherent photonics based on planarized THz quantum cascade lasers, featuring low losses and improved dispersion, RF and thermal properties.