Nonlinear light generation in topological nanostructures

Manipulating topological valley modes in plasmonic metasurfaces

“…Exploiting the radiative coupling regime between the NPs [7], whose interactions are mediated by diffractive modes in the plane of the array (surface lattice resonances), has enabled the experimental demonstration of lasing [8,9] and Bose-Einstein condensation [10] in plasmonic lattices, due to their dramatic quality factor enhancement. On the other hand, the near field coupling regime, where the distance between the NPs is very subwavelength, is currently regaining interest due to the possibility of realising topological phases of light confined at nanoscale dimensions using metal NPs as well as other nanoresonators such as dielectric NPs [11][12][13][14][15][16][17][18][19]. This has been sparked by the potential of topological protection to provide robust light propagation immune to certain kinds of disorder and imperfections in samples; in analogy to the effects present * matthew.proctor12@imperial.ac.uk in topological insulators, materials which are insulating in the bulk and possess protected conduction states along their edge [20].…”

Inelastic Scattering of Photon Pairs in Qubit Arrays with Subradiant States

“…Introduction. Nonlinear manipulation of light via its interaction with matter plays an essential role in optics and its applications [1][2][3], including optical communications [4] and sensing [5]. The light-matter interaction can be strongly modified by collective coherent superradiance or subradiance, where the spontaneous emission speeds up or slows down [6][7][8][9].…”

Topological Phases of Polaritons in a Cavity Waveguide

“…Recently, a rapidly growing research field known as topological nanophotonics has emerged [4,5], which seeks to harness the power of topological physics in a new generation of highly controllable light-based structures and devices [6][7][8]. It is envisaged that this topic will lead to a deeper understanding of light-matter interactions at a fundamental level [9,10], as well as novel applications including chiral lasers [11], robust integrated quantum optical circuits [12], and nonlinear light generators [13].…”