Abstract
Optical antennas are utilized to link free-space optical radiation with localized energy, enabling varied applications such as beam focusing, freewheeling steering, biosensing, and optical communications. Here, we demonstrate a novel silicon nanoantenna array (SNA), comprising subwavelength silicon nanorods that direct light emission vertically. When the array of nanorods was positioned optimally, the efficiency of the upward light emission reached 46%. In addition, the rigorous design of the array of nanorods resulted in a well-confined profile of the vertically emitting beam. The SNA, therefore, provides a new approach for 3D optical interconnections between different decks of integrated photonics circuits.
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