Articles in 2011

Researchers demonstrate a terahertz quantum cascade laser operating in a regime of active mode-locking by modulating its bias current with a radiofrequency synthesizer. This technique allows coherent sampling of the terahertz electric field as well as control over the laser's carrier–envelope phase shift.

Scientists describe a size-selective quantum dot patterning technique that involves kinetically controlling the nanotransfer process without a solvent. The resulting printed quantum dot films exhibit excellent morphology and a well-ordered quantum dot structure. This technique allows fabrication of a 4-inch (or larger) thin-film transistor display with high colour purity and extremely high resolution.

Based on a CMOS-compatible growth process, researchers successfully demonstrate the bottom-up integration of InGaAs nanopillar lasers onto silicon chips. The resulting nanolaser offers tiny footprints and scalability, making it particularly suited to high-density optoelectronics.

Spectral modulation of a broadband pump beam allows sensitive and specific molecular imaging based on stimulated Raman scattering. Measurements of cholesterol, protein, and stearic and oleic acid are reported.

Laser spectroscopy based on the nonlinear photothermal and photoacoustic spectral resonances of nanoparticles is demonstrated. This approach will be potentially useful for applications such as multispectral imaging, multicolour cytometry, and the study of laser–nanoparticle interactions at a resolution beyond the spectral limit.

Researchers propose a new type of multiphoton entangled state and demonstrate its working principles of measurement-based quantum computation in correlation space. With four- and six-qubit states, they realize a universal set of single-qubit rotations, two-qubit entangling gates and further Deutsch's algorithm.