Color centers are promising candidates for quantum technologies due to their long coherence times and high-quality spin-photon interfaces. Silicon has recently emerged as a host for color centers operating in the telecommunication bands, in a technological platform featuring the world’s most advanced manufacturing, electronics, and photonics. In this talk, I will present our recent work on the fabrication and isolation of individual G-centers in silicon photonic waveguides, their spectral reconfiguration, and the enhancement of their light-matter interaction via coupling to photonic crystal cavities.
High-speed SLMs are necessary for various classical and quantum applications, including massively parallel remote sensing, high-repetition-rate pulsed laser shaping, and scalable control of quantum objects at timescales faster than their decoherence time. Here, we demonstrate a high-speed SLM by two-dimensional electric field patterning of a lithium niobate thin film. A high-quality factor guided mode resonance enhances the amplitude and phase modulation from the induced index variation. Our approach offers fast (> GHz), low power, and high diffraction efficiency tuning.
Silicon photonics enables the development of optical components on a chip with the potential for large-scale optical integrated circuits that can be fabricated at the wafer-scale using foundries similar to those used in the electronics industry. Although silicon is a passive optical material with an indirect bandgap, reconfigurable devices have been demonstrated using thermo-optic effects (large phase shifts, but relatively slow with large power consumption) and carrier plasma dispersion effects (high-speed, but small phase shifts). We recently demonstrated a low-power approach for inducing large phase shifts (>2π) using a technique that we call micro-opto-electro-mechanical index perturbation (MOEM-IP). In this initial work we characterized silicon nitride waveguides in which the propagating optical mode’s evanescent field is vertically coupled to silicon nitride microbridges. This interaction leads to an effective index tuning that is a strong function of the waveguide-microbridge separation. We now extend our MOEM-IP approach to different configurations (i.e. in-plane coupling) and material systems (i.e. silicon-oninsulator). Mode perturbation simulations indicate that the MOEM-IP approach is widely applicable to many configurations and material systems enabling large effective index tuning (Δneffective>0.1) requiring microbridge displacements of only a few hundred nanometers. We also examine several device applications that take advantage of MOEM-IP. These include tunable optical filters using high-Q microring cavities and optical phased arrays that enable chip-scale beam steering in two-dimensions using low-power phase shifting enabled by MOEM-IP.
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