Efficient manipulation of the valley degree of freedom in Transition Metal Dichalcogenide (TMD) monolayers at the nanoscale becomes very desirable for future developments in valleytronics. Resonant optical nanostructures are considered as potential tools in this endeavor; however, it is still unclear how they affect polarization properties of valley-specific monolayer emission. Here, we present a systematic experimental and numerical study that is aimed to bridge this gap. As a simple model, we consider a hybrid system where valley-polarized photoluminescence [1] or second harmonic from MoS2 - monolayer is coupled with a plasmonic nanosphere. Through this study, we are not only aimed to refine the exciting simulation approaches for valleytronic devices, but also contribute to the deeper understanding of the rich physics of light-matter interactions at the nanoscale.
We present a room temperature single photon source based on a color center in hexagonal boron nitride for satellite-based quantum networks. The resonator-coupled emitter is characterized by a narrowband tuneable spectrum, high photon purity, and high quantum efficiency. The photon source is currently integrated on a 3U CubeSat to qualify it for use in a future satellite-based global quantum-encrypted network. The satellite also performs a fundamental test of quantum gravity.
To effectively improve color neutrality of antireflection (AR) coatings, a layer with a very low refractive index (n < 1,3) must be used as the top layer. However, solid materials with such a low refractive index (n) does not exist. The deposition of low molecule weight organic materials as compact films, and a subsequent plasma etching procedure on these films, offered the possibility to produce a nanostructured layer with a very low refractive index as top layer for an antireflection coating. Strongly curved aspheric lenses were coated with such a super-broadband AR design (ARplas2) and the antireflection performance was measured at different locations on the lens. An average reflection < 0,25 % over the full visible wavelength range was measured even in the outermost region of the curvature.
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