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Short distance optical communication is required to reduce power consumption of ICT systems and continuously improve performance of datacentres and HPCs [1]. Reduced energy consumption and increased bandwidth density [2-3] are required to develop optical interconnects between chips and on chips. Therefore, lasers and detectors with ultra-low operating energy have to be connected by Si nanowire waveguides...
Femtosecond laser waveguide writing is a powerful technique to create photonic devices and is already widely applied in glasses and crystals [1]. In polymers however, relatively little work has been reported so far. Material specific effects during femtosecond laser irradiation such as chain scission or crosslinking and an overall low damage threshold demand for alternative writing schemes to overcome...
Silicon waveguides are widely used as optical interconnects and they are particularly important for Si-photonics. Si-based devices, along with other optical elements, are entirely fabricated on the top surface of Si wafers. However, further integration of photonic and electronic devices in the same chip requires a new approach. One alternative is to utilize the bulk of the wafer for fabricating photonic...
Optical photonic lattices attract strong interest as a flexible experimental platform with applications ranging from beam shaping and switching [1] to quantum photonics [2]. Importantly, various array designs were suggested by mapping quantum Hamiltonian dynamics to the optical beam evolution [3, 4].
Coupled waveguide arrays lend themselves very well to photonic engineering through tailoring of the propagation and coupling constants [1]. Especially interesting is the manipulation of collective Floquet Bloch waves (extended beams see Figure 1 top, a and d) that propagate over several waveguides through evanescent coupling and their manipulation for classical and quantum data processing. Phase-front...
One of the main challenges of astronomy these days is to directly image exoplanets and protoplanetary disks using diffraction limited optics. Due to the proximity of the planet to the host star and its small size, the discovery of new planets requires high angular resolution and high contrast imaging. Achieving these two requirements is challenging with existing astronomical instrument. However, the...
A design for a laser is presented here, based on gold-coated on-chip etched facets and multimode interference (MMI) couplers [1]. The laser (shown in Fig. 1) was fabricated from commercially obtained regrowth-free 1550nm laser material and using exclusively standard UV lithography. The fabrication process is a two etch-depth process compatible with most standardised shared foundry processes [2]. The...
Quantum spectroscopy is a powerful tool that is based on classically detecting one of the photons of a biphoton state to study how the other photon experiences the environment [1]. It is especially useful, since the signal photon can be read out in the visible range, where the detection is simple and affordable, while the idler photon can probe the optical properties in mid-infrared (MIR) and far-infrared...
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