A nanophotonic laser on a graph

Michele Gaio, Dhruv Saxena, Jacopo Bertolotti, Dario Pisignano, Andrea Camposeo and Riccardo Sapienza ()
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Michele Gaio: Imperial College London
Dhruv Saxena: Imperial College London
Jacopo Bertolotti: University of Exeter
Dario Pisignano: NEST, Istituto Nanoscienze-CNR
Andrea Camposeo: NEST, Istituto Nanoscienze-CNR
Riccardo Sapienza: Imperial College London

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Conventional nanophotonic schemes minimise multiple scattering to realise a miniaturised version of beam-splitters, interferometers and optical cavities for light propagation and lasing. Here instead, we introduce a nanophotonic network built from multiple paths and interference, to control and enhance light-matter interaction via light localisation. The network is built from a mesh of subwavelength waveguides, and can sustain localised modes and mirror-less light trapping stemming from interference over hundreds of nodes. With optical gain, these modes can easily lase, reaching ~100 pm linewidths. We introduce a graph solution to the Maxwell’s equation which describes light on the network, and predicts lasing action. In this framework, the network optical modes can be designed via the network connectivity and topology, and lasing can be tailored and enhanced by the network shape. Nanophotonic networks pave the way for new laser device architectures, which can be used for sensitive biosensing and on-chip optical information processing.

Date: 2019
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DOI: 10.1038/s41467-018-08132-7

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