Ms. Marina Raevskaia Profile

Marina Raevskaia

at Technische Univ Eindhoven

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Proceedings Article | 2 April 2020 Presentation

Bound states in the continuum for photonic integration and InP membranes for heralded single photon generation (Conference Presentation)

Hon Ki Tsang, Yi Wang, Rakesh Kumar, Zejie Yu, Xiankai Sun, Marina Raevskaia, Vadim Pogoretskii, Yuqing Jiao

Proceedings Volume 11364, 113640X (2020) https://doi.org/10.1117/12.2558401

KEYWORDS: Single photon, Microrings, Silicon, Resonators, Lithium niobate, Graphene, Photodetectors, Nonlinear optics, Waveguides, Photons

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We present our recent results on the use of two quite different approaches for photonic integration. First we shall describe how we used the concept of bound states in the continuum (BiC) to make channel guided devices without the need for any dry etching. The BiC channel waveguide employs a substrate that is completely flat. The completely flat structure is attractive for hybrid integration of 2D materials because it does not introduce sharp corners which can reduce the electrical mobility of the 2D material. Channel guiding of light can nonetheless be achieved by spin coating a lower-refractive-index polymer/photoresist on the 2D material and developing it to form a channel. This approach for integrating 2D materials also increases the optical overlap with the 2D material. We used this approach for the hybrid integration of graphene on lithium niobate for making 40-GHz-bandwidth channel-guided photodetectors and electroabsorption modulators on lithium niobate. The BiC concept facilitates the hybrid integration of 2D materials on different substrates and may also be used to increase the effective optical nonlinearity of the underlying substrate by hybrid integration of the appropriate 2D material. Second we shall discuss the InP membrane waveguide platform for nonlinear applications. InP has a third order nonlinearity that is over an order of magnitude larger than silicon, and is therefore of potential interest for spontaneous four wave mixing to produce entangled photons. The use of InP membranes can potentially facilitate the integration of active III-V lasers, and Geiger mode avalanche photodiodes for single photon detection and nonlinear devices on large scale silicon wafers which can integrate the large delay interferometers and filters needed for quantum information processing. We discuss the advantages and disadvantages of InP for SFWM and present recent results on the use of InP membranes for generating heralded single photons.

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