Abstract
The development of integrated photonic devices has led to important advancements in the field of light-matter interaction at the nanoscale. One of the main focal points is the coupling between single photon emitters and optical waveguides aiming to achieve efficient optical confinement and propagation. In this work, we focus on the characterization of a hybrid dielectric/plasmonic waveguide consisting of a gold triangular nanoantenna placed on top of a TiO2 waveguide. The strong directionality of the device is experimentally demonstrated by comparing the intensity scattered by the nanotriangle to the one scattered by a SNOM tip for different illumination geometries. The ability of the plasmonic antenna to generate powerful coupling between a single emitter and the waveguide will also be highlighted through numerical simulations.
Highlights
The development of integrated optical devices has promoted significant advancement in controlling light-matter interaction at the nanoscale. Such opto-electronic devices aim to perform and implement logical operations using optical components [1], which has led to a decrease in their size reaching a limit that conventional electronic circuits cannot endure. This is promising, as technological and physical limits hamper the improvement of the computing capacities of conventional electronic processors, a problem that is overcome by integrated photonic devices [2]
We develop a device made up of a hybrid nanoantenna/dielectric waveguide (DWG) aiming to couple the light emitted by a single photon source and potentially achieve efficient communication with a distant receiver
Our hybrid structure was fabricated by a two-step electron beam lithography (EBL) technique
Summary
The development of integrated optical devices has promoted significant advancement in controlling light-matter interaction at the nanoscale. The main building blocks of quantum photonic circuits are single photon sources [9,10] The development of such new technologies lies in the effective coupling of the light emitted by single emitters into optical waveguides, as well as the efficient communication between them [11,12]. We develop a device made up of a hybrid nanoantenna/dielectric waveguide (DWG) aiming to couple the light emitted by a single photon source and potentially achieve efficient communication with a distant receiver. The advantage of the dielectric nature of the waveguide is that it allows light propagation to distances much greater than those provided by SPPs. In addition, the aim of the plasmonic nanoantenna, triangular shaped, is to improve the coupling between the emitter and the DWG, and to provide strong directionality of the coupled light with an easy to fabricate device with respect to more complex geometries. Placing two distant similar nanotriangles base-to-base on the DWG will allow to inject and decouple the confined light, achieving energy transfer from the emitter to the receiver via the DWG
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