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Despite the intense developments in the field of integrated optics, there is still a need of a compact, easy and cost-effective solution for light in-coupling in integrated photonic optical waveguides for biosensing, which are designed to be single use devices in clinical environments. The majority of current solutions are based on grating couplers fabricated with e-beam lithography, which increases...
Slow light propagation through engineered band dispersion in photonic structures is a highly promising tool for realizing integrated optical delay lines and efficient photonic devices through enhanced optical nonlinearities [1, 2]. A primary goal is to achieve devices with large, approximately constant group index over the largest possible bandwidth, thus enabling multimode and pulsed operation [2]...
One of the biggest challenges in modem Astronomy is the direct detection of extrasolar planets using ground based telescopes. While the small angular separation of the star-planet system is an unchangeable limitation, the contrast ratio can dramatically be improved by shifting the observing wavelength to the mid-infrared. In the astronomical L'-band (3.5–4.1 μm), atmospherical disturbances are relatively...
Multi-mode interferometers can be used for a wide range of applications. They allow a higher precision for a phase measurement compared to a simple two-mode version [1, 2]. In quantum optics, schemes for enhancement of non-classical visibility [3] as well as better resilience to photon loss [4] have been proposed. All these schemes depend on a good stability of the used interferometer, which gives...
Quantum optics experiments are increasingly taking an integrated format for the benefits of phase stability and scalability. Silica has proved an advantageous material for this work due to its low propagation loss and high-efficiency coupling to optical fibre, and a number of key on-chip experiments have already been carried out with up to four photons using this material [1]. Fabrication imperfections...
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