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We demonstrate ultrastrong light-matter coupling between less than 80 electrons located in the last occupied Landau level of an high mobility 2 dimensional electron gas and a LC resonator with an extremely small effective mode volume Veff /λ3 = 4 × 10−10. The unperturbed frequency is 300 GHz and the measured normalized coupling ratio is Ω/ω = 0.35.
We report on design, fabrication and investigation of a buried heterostructure photonic crystal quantum cascade laser operating in the mid-IR (8.5μm) at room temperature, leading to single mode emission on a 600μm by 600μm mesa.
Laser-based frequency combs play an important role in applications as spectroscopy. In the visible and infrared regime devices are already commercially available. Since a lot of rotation and vibration frequencies of gases lie in the THz domain, it is desirable to realize a powerful and broad frequency comb at such frequencies. THz Quantum cascade lasers (QCLs) are able to operate in this frequency...
Quantum Cascade Lasers (QCL) [1] are readily used sources in the mid-infrared serving mostly spectroscopic purposes, but also countermeasures and medical applications. For many of these purposes a single mode emission at a previously determined wavelength is required. This can be achieved for instance by adding Distributed-Feedback (DFB) [2] into the emitter. One approach to generate a DFB QCL is...
We have studied the influence of SiO2 deposition on the transport properties of AlInAs HEMT layers by means of Hall effect and deep-level transient spectroscopy measurements. We observed that a thermal treatment corresponding to a regrowth after SiO2 deposition induced a degradation of the electron transport properties. The diffusion of a deep level from the SiO2 is the probable cause of this degradation...
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